EVPN Features

This chapter describes how to configure Layer 2 Ethernet VPN (EVPN) features on the router.

EVPN Overview

Ethernet VPN (EVPN) is a next generation solution that provides Ethernet multipoint services over MPLS networks. EVPN operates in contrast to the existing Virtual Private LAN Service (VPLS) by enabling control-plane based MAC learning in the core. In EVPN, PEs participating in the EVPN instances learn customer MAC routes in control-plane using MP-BGP protocol. Control-plane MAC learning brings a number of benefits that allow EVPN to address the VPLS shortcomings, including support for multi-homing with per-flow load balancing.

EVPN provides the solution for network operators for the following emerging needs in their network:

  • Data center interconnect operation (DCI)

  • Cloud and services virtualization

  • Remove protocols and network simplification

  • Integration of L2 and L3 services over the same VPN

  • Flexible service and workload placement

  • Multi-tenancy with L2 and L3 VPN

  • Optimal forwarding and workload mobility

  • Fast convergence

  • Efficient bandwidth utilization

EVPN Benefits

The EVPN provides the following benefits:

  • Integrated Services: Integrated L2 and L3 VPN services, L3VPN-like principles and operational experience for scalability and control, all-active multi-homing and PE load-balancing using ECMP, and enables load balancing of traffic to and from CEs that are multihomed to multiple PEs.

  • Network Efficiency: Eliminates flood and learn mechanism, fast-reroute, resiliency, and faster reconvergence when the link to dual-homed server fails, optimized Broadcast, Unknown-unicast, Multicast (BUM) traffic delivery.

  • Service Flexibility: MPLS data plane encapsulation, support existing and new services types (E-LAN, E-Line), peer PE auto-discovery, and redundancy group auto-sensing.

EVPN Modes

The following EVPN modes are supported:

  • Single-homing - This enables you to connect a customer edge (CE) device to one provider edge (PE) device.

  • Multihoming - This enables you to connect a customer edge (CE) device to more than one provider edge (PE) device. Multihoming ensures redundant connectivity. The redundant PE device ensures that there is no traffic disruption when there is a network failure. Following are the types of multihoming:

    • All-Active - In all-active mode all the PEs attached to the particular Ethernet-Segment is allowed to forward traffic to and from that Ethernet Segment.

EVPN Concepts

To implement EVPN features, you need to understand the following concepts:

  • Ethernet Segment (ES): An Ethernet segment is a set of Ethernet links that connects a multihomed device. If a multi-homed device or network is connected to two or more PEs through a set of Ethernet links, then that set of links is referred to as an Ethernet segment. The Ethernet segment route is also referred to as Route Type 4. This route is used for designated forwarder (DF) election for BUM traffic.

  • Ethernet Segment Identifier (ESI): Ethernet segments are assigned a unique non-zero identifier, which is called an Ethernet Segment Identifier (ESI). ESI represents each Ethernet segment uniquely across the network.

  • EVI: The EVPN instance (EVI) is represented by the virtual network identifier (VNI). An EVI represents a VPN on a PE router. It serves the same role of an IP VPN Routing and Forwarding (VRF), and EVIs are assigned import/export Route Targets (RTs). Depending on the service multiplexing behaviors at the User to Network Interface (UNI), all traffic on a port (all-to-one bundling), or traffic on a VLAN (one-to-one mapping), or traffic on a list/range of VLANs (selective bundling) can be mapped to a Bridge Domain (BD). This BD is then associated to an EVI for forwarding towards the MPLS core.

  • EAD/ES: Ethernet Auto Discovery Route per ES is also referred to as Route Type 1. This route is used to converge the traffic faster during access failure scenarios. This route has Ethernet Tag of 0xFFFFFFFF.

  • EAD/EVI: Ethernet Auto Discovery Route per EVI is also referred to as Route Type 1. This route is used for aliasing and load balancing when the traffic only hashes to one of the switches. This route cannot have Ethernet tag value of 0xFFFFFF to differentiate it from the EAD/ES route.

  • Aliasing: It is used for load balancing the traffic to all the connected switches for a given Ethernet segment using the Route Type 1 EAD/EVI route. This is done irrespective of the switch where the hosts are actually learned.

  • Mass Withdrawal: It is used for fast convergence during the access failure scenarios using the Route Type 1 EAD/ES route.

  • DF Election: It is used to prevent forwarding of the loops. Only a single router is allowed to decapsulate and forward the traffic for a given Ethernet Segment.

EVPN Operation

At startup, PEs exchange EVPN routes in order to advertise the following:

  • VPN membership: The PE discovers all remote PE members of a given EVI. In the case of a multicast ingress replication model, this information is used to build the PEs flood list associated with an EVI. BUM labels and unicast labels are exchanged when MAC addresses are learned.

  • Ethernet segment reachability: In multihoming scenarios, the PE auto-discovers remote PE and their corresponding redundancy mode (all-active or single-active). In case of segment failures, PEs withdraw the routes used at this stage in order to trigger fast convergence by signaling a MAC mass withdrawal on remote PEs.

  • Redundancy Group membership: PEs connected to the same Ethernet segment (multihoming) automatically discover each other and elect a Designated Forwarder (DF) that is responsible for forwarding Broadcast, Unknown unicast and Multicast (BUM) traffic for a given EVI.

Figure 1. EVPN Operation


EVPN can operate in single-homing or dual-homing mode. Consider single-homing scenario, when EVPN is enabled on PE, Route Type 3 is advertised where each PE discovers all other member PEs for a given EVPN instance. When an unknown unicast (or BUM) MAC is received on the PE, it is advertised as EVPN Route Type 2 to other PEs. MAC routes are advertised to the other PEs using EVPN Route Type 2. In multihoming scenarios, Route Types 1, 3, and 4 are advertised to discover other PEs and their redundancy modes (single-active or all-active). Use of Route Type 1 is to auto-discover other PE which hosts the same CE. The other use of this route type is to fast route unicast traffic away from a broken link between CE and PE. Route Type 4 is used for electing designated forwarder. For instance, consider the topology when customer traffic arrives at the PE, EVPN MAC advertisement routes distribute reachability information over the core for each customer MAC address learned on local Ethernet segments. Each EVPN MAC route announces the customer MAC address and the Ethernet segment associated with the port where the MAC was learned from and its associated MPLS label. This EVPN MPLS label is used later by remote PEs when sending traffic destined to the advertised MAC address.

EVPN Route Types

The EVPN network layer reachability information (NLRI) provides different route types.

Table 1. EVPN Route Types

Route Type

Name

Usage

1

Ethernet Auto-Discovery (AD) Route

Few routes are sent per ES, carries the list of EVIs that belong to ES

2

MAC/IP Advertisement Route

Advertise MAC, address reachability, advertise IP/MAC binding

3

Inclusive Multicast Ethernet Tag Route

Multicast Tunnel End point discovery

4

Ethernet Segment Route

Redundancy group discovery, DF election

5

IP Prefix Route

Advertise IP prefixes.

Route Type 1: Ethernet Auto-Discovery (AD) Route

The Ethernet Auto-Discovery (AD) routes are advertised on per EVI and per ESI basis. These routes are sent per ES. They carry the list of EVIs that belong to the ES. The ESI field is set to zero when a CE is single-homed. This route type is used for mass withdrawal of MAC addresses and aliasing for load balancing.

Route Type 2: MAC/IP Advertisement Route

These routes are per-VLAN routes, so only PEs that are part of a VNI require these routes. The host's IP and MAC addresses are advertised to the peers within NRLI. The control plane learning of MAC addresses reduces unknown unicast flooding.

Route Type 3: Inclusive Multicast Ethernet Tag Route

This route establishes the connection for broadcast, unknown unicast, and multicast (BUM) traffic from a source PE to a remote PE. This route is advertised on per VLAN and per ESI basis.

Route Type 4: Ethernet Segment Route

Ethernet segment routes enable to connect a CE device to two or PE devices. ES route enables the discovery of connected PE devices that are connected to the same Ethernet segment.

Route Type 5: IP Prefix Route

The IP prefixes are advertised independently of the MAC-advertised routes. With EVPN IRB, host route /32 is advertised using RT-2 and subnet /24 is advertised using RT-5.


Note

With EVPN IRB, host route /32 are advertised using RT-2 and subnet /24 are advertised using RT-5.

Configure EVPN L2 Bridging Service

Perform the following steps to configure EVPN L2 bridging service.


Note
Always ensure to change the label mode from per-prefix to per-VRF label mode. Since L2FIB and VPNv4 route (labels) shares the same resource, BVI ping fails when you exhaust the resources.

Note

Flooding disable isn’t supported on EVPN bridge domains.

 

/* Configure address family session in BGP */
RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router#(config)# router bgp 200
RP/0/RSP0/CPU0:router#(config-bgp)# bgp router-id 209.165.200.227
RP/0/RSP0/CPU0:router#(config-bgp)# address-family l2vpn evpn
RP/0/RSP0/CPU0:router#(config-bgp)# neighbor 10.10.10.10
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# remote-as 200
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# description MPLSFACING-PEER
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# update-source Loopback 0
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# address-family l2vpn evpn

/* Configure EVI and define the corresponding BGP route targets */

Router# configure
Router(config)# evpn
Router(config-evpn)# evi 6005
Router(config-evpn-evi)# bgp
Router(config-evpn-evi-bgp)# rd 200:50
Router(config-evpn-evi-bgp)# route-target import 100:6005
Router(config-evpn-evi-bgp)# route-target export 100:6005
Router(config-evpn-evi-bgp)# exit
Router(config-evpn-evi)# advertise-mac

/* Configure a bridge domain */
Router# configure 
Router(config)# l2vpn 
Router(config-l2vpn)# bridge group 1
Router(config-l2vpn-bg)# bridge-domain 1-1
Router(config-l2vpn-bg-bd)# interface GigabitEthernet 0/0/0/1
Router(config-l2vpn-bg-bd-ac)# evi 6005
Router(config-l2vpn-bg-bd-ac-evi)# commit
Router(config-l2vpnbg-bd-ac-evi)# exit

Running Configuration


router bgp 200 bgp 
 router-id 209.165.200.227
 address-family l2vpn evpn
 neighbor 10.10.10.10 
  remote-as 200 description MPLS-FACING-PEER 
  updatesource Loopback0 
  addressfamily l2vpn evpn
!
 
configure
evpn
 evi 6005
  bgp
   rd 200:50
   route-target import 100:6005
   route-target export 100:6005
!
  advertise-mac


configure
l2vpn
 bridge group 1
  bridge-domain 1-1
   interface GigabitEthernet 0/0/0/1

    evi 6005
!

EVPN Software MAC Learning

The MAC addresses learned on one device needs to be learned or distributed on the other devices in a VLAN. EVPN Software MAC Learning feature enables the distribution of the MAC addresses learned on one device to the other devices connected to a network. The MAC addresses are learnt from the remote devices using BGP.

Figure 2. EVPN Software MAC Learning

The above figure illustrates the process of software MAC learning. The following are the steps involved in the process:

  1. Traffic comes in on one port in the bridge domain.

  2. The source MAC address (AA) is learnt on the PE and is stored as a dynamic MAC entry.

  3. The MAC address (AA) is converted into a type-2 BGP route and is sent over BGP to all the remote PEs in the same EVI.

  4. The MAC address (AA) is updated on the PE as a remote MAC address.

Configure EVPN Software MAC Learning

The following section describes how you can configure EVPN Software MAC Learning:


Note

The router does not support flow-aware transport (FAT) pseudowire.

 

/* Configure bridge domain. */

RP/0/RSP0/CPU0:router(config)# l2vpn
RP/0/RSP0/CPU0:router(config-l2vpn)# bridge group EVPN_SH
RP/0/RSP0/CPU0:router(config-l2vpn-bg)# bridge-domain EVPN_2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# interface TenGigE0/0/0/1
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd-ac)# exit
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# interface BundleEther 20.2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd-ac)# storm-control broadcast pps 10000 ← Enabling storm-control is optional
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd-ac)# exit
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# evi 2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd-evi)# commit

/* Configure address family session in BGP. */

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router bgp 200
RP/0/RSP0/CPU0:router(config-bgp)# bgp router-id 209.165.200.227
RP/0/RSP0/CPU0:router(config-bgp)# address-family l2vpn evpn

RP/0/RSP0/CPU0:router(config-bgp-nbr)# remote-as 200
RP/0/RSP0/CPU0:router(config-bgp-nbr)# description MPLSFACINGPEER
RP/0/RSP0/CPU0:router(config-bgp-nbr)# update-source Loopback 0
RP/0/RSP0/CPU0:router(config-bgp-nbr)# address-family l2vpn evpn

Supported Modes for EVPN Software MAC Learning

The following are the modes in which EVPN Software MAC Learning is supported:

  • Single Home Device (SHD) or Single Home Network (SHN)

  • Dual Home Device (DHD)—All Active Load Balancing

Single Home Device or Single Home Network Mode

The following section describes how you can configure EVPN Software MAC Learning feature in single home device or single home network (SHD/SHN) mode:

Figure 3. Single Home Device or Single Home Network Mode

In the above figure, the PE (PE1) is attached to Ethernet Segment using bundle or physical interfaces. Null Ethernet Segment Identifier (ESI) is used for SHD/SHN.

Configure EVPN in Single Home Device or Single Home Network Mode

This section describes how you can configure EVPN Software MAC Learning feature in single home device or single home network mode. 

/* Configure bridge domain. */

RP/0/RSP0/CPU0:router(config)# l2vpn
RP/0/RSP0/CPU0:router(config-l2vpn)# bridge group EVPN_ALL_ACTIVE 
RP/0/RSP0/CPU0:router(config-l2vpn-bg)# bridge-domain EVPN_2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# interface Bundle-Ether1.2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# evi 2001


/* Configure advertisement of MAC routes. */

RP/0/RSP0/CPU0:router(config)# evpn
RP/0/RSP0/CPU0:router(config-evpn)# evi 2001
RP/0/RSP0/CPU0:router(config-evpn-evi)# advertise-mac


/* Configure address family session in BGP. */

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router#(config)# router bgp 200
RP/0/RSP0/CPU0:router#(config-bgp)# bgp router-id 09.165.200.227
RP/0/RSP0/CPU0:router#(config-bgp)# address-family l2vpn evpn
RP/0/RSP0/CPU0:router#(config-bgp)# neighbor 10.10.10.10
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# remote-as 200
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# description MPLSFACING-PEER
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# update-source Loopback 0
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# address-family l2vpn evpn
Running Configuration 

l2vpn 
bridge group EVPN_ALL_ACTIVE 
 bridge-domain EVPN_2001 
  interface BundleEther1.2001
  evi 2001 
!
evpn
 evi 2001  
  advertise-mac
! 
router bgp 200 bgp 
 router-id 40.40.40.40
 address-family l2vpn evpn
 neighbor 10.10.10.10 
  remote-as 200 description MPLS-FACING-PEER 
  updatesource Loopback0 
  addressfamily l2vpn evpn

Verification

Verify EVPN in single home devices. 


RP/0/RSP0/CPU0:router# show evpn ethernet-segment interface Te0/4/0/10 detail

Ethernet Segment Id    Interface   Nexthops
--------------------   ----------  ----------
N/A     													  Te0/4/0/10  20.20.20.20
……………
 Topology :
 Operational : SH
 Configured : Single-active (AApS) (default)

Dual Home Device—All-Active Load Balancing Mode

The following section describes how you can configure EVPN Software MAC Learning feature in dual home device (DHD) in all-active load balancing mode:

Figure 4. Dual Home Device —All-Active Load Balancing Mode

All-active load-balancing is known as Active/Active per Flow (AApF). In the above figure, identical Ethernet Segment Identifier is used on both EVPN PEs. PEs are attached to Ethernet Segment using bundle interfaces. In the CE, single bundles are configured towards two EVPN PEs. In this mode, the MAC address that is learnt is stored on both PE1 and PE2. Both PE1 and PE2 can forward the traffic within the same EVI.

Configure EVPN Software MAC Learning in Dual Home Device—All-Active Mode

This section describes how you can configure EVPN Software MAC Learning feature in dual home device—all-active mode: 

/* Configure bridge domain. */

RP/0/RSP0/CPU0:router(config)# l2vpn
RP/0/RSP0/CPU0:router(config-l2vpn)# bridge group EVPN_ALL_ACTIVE 
RP/0/RSP0/CPU0:router(config-l2vpn-bg)# bridge-domain EVPN_2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# interface Bundle-Ether1.2001
RP/0/RSP0/CPU0:router(config-l2vpn-bg-bd)# evi 2001


/* Configure advertisement of MAC routes. */

RP/0/RSP0/CPU0:router(config)# evpn
RP/0/RSP0/CPU0:router(config-evpn)# evi 2001
RP/0/RSP0/CPU0:router(config-evpn-evi)# advertise-mac
RP/0/RSP0/CPU0:router(config-evpn-evi)# exit
RP/0/RSP0/CPU0:router(config-evpn)# interface bundle-ether1
RP/0/RSP0/CPU0:router(config-evpn-ac)# ethernet-segment
RP/0/RSP0/CPU0:router(config-evpn-ac-es)# identifier type 0 01.11.00.00.00.00.00.00.01


/* Configure address family session in BGP. */

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router#(config)# router bgp 200
RP/0/RSP0/CPU0:router#(config-bgp)# bgp router-id 209.165.200.227
RP/0/RSP0/CPU0:router#(config-bgp)# address-family l2vpn evpn
RP/0/RSP0/CPU0:router#(config-bgp)# neighbor 10.10.10.10
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# remote-as 200
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# description MPLSFACING-PEER
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# update-source Loopback 0
RP/0/RSP0/CPU0:router#(config-bgp-nbr)# address-family l2vpn evpn


/* Configure Link Aggregation Control Protocol (LACP) bundle. */

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface Bundle-Ether1.300
RP/0/RSP0/CPU0:router(config-if)# lacp switchover suppress-flaps 300
RP/0/RSP0/CPU0:router(config-if)# exit


/* Configure VLAN Header Rewrite.*/

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# interface bundle-Ether1.2001 l2transport
RP/0/RSP0/CPU0:router(config-if)# encapsulation dot1q 10
RP/0/RSP0/CPU0:router(config-if)# rewrite ingress tag pop 1 symmetric
Running Configuration 

l2vpn
bridge group EVPN_ALL_ACTIVE
 bridge-domain EVPN_2001
 interface Bundle-Ether1.2001
 !
 evi 2001
 !
!
evpn
 evi 2001
 !
 advertise-mac
 !
 interface bundle-ether1
  ethernet-segment
  identifier type 0 01.11.00.00.00.00.00.00.01
  !
 !
router bgp 200
bgp router-id  209.165.200.227
address-family l2vpn evpn
!
neighbor 10.10.10.10
 remote-as 200
 description MPLS-FACING-PEER
 update-source Loopback0
 address-family l2vpn evpn
!
interface Bundle-Ether1
lacp switchover suppress-flaps 300
load-interval 30
!
interface bundle-Ether1.2001 l2transport
 encapsulation dot1aq 2001
 rewrite ingress tag pop 1 symmetric
!

Verification

Verify EVPN in dual home devices in All-Active mode.


Note
With the EVPN IRB, the supported label mode is per-VRF. 

RP/0/RSP0/CPU0:router# show evpn ethernet-segment interface bundle-Ether 1 carvin$

Ethernet Segment Id        Interface  Nexthops
-------- ---------- 	      --------   --------
0100.211b.fce5.df00.0b00   BE11       10.10.10.10
 209.165.201.1
Topology :
 Operational : MHN
 Configured : All-active (AApF) (default)
 Primary Services : Auto-selection
 Secondary Services: Auto-selection
 Service Carving Results:
 Forwarders : 4003
 Elected : 2002
 EVI E : 2000, 2002, 36002, 36004, 36006, 36008
 ........
 Not Elected : 2001
 EVI NE : 2001, 36001, 36003, 36005, 36007, 36009

	MAC Flushing mode : Invalid

Peering timer : 3 sec [not running]
 Recovery timer : 30 sec [not running]
 Local SHG label : 34251
 Remote SHG labels : 1
  38216 : nexthop 209.165.201.1

Verify EVPN Software MAC Learning

Verify the packet drop statistics.


Note
Disable CW configuration if any in EVPN peer nodes, as CW is not supported in EVPN Bridging. 
RP/0/RSP0/CPU0:router# show l2vpn bridge-domain bd-name EVPN_2001 details

Bridge group: EVPN_ALL_ACTIVE, bridge-domain: EVPN_2001, id: 1110,
state: up, ShgId: 0, MSTi: 0
 List of EVPNs:
 EVPN, state: up
 evi: 2001
 XC ID 0x80000458
 Statistics:
 packets: received 28907734874 (unicast 9697466652), sent
76882059953
 bytes: received 5550285095808 (unicast 1861913597184), sent
14799781851396
 MAC move: 0
 List of ACs:
 AC: TenGigE0/0/0/1, state is up
 Type VLAN; Num Ranges: 1
...
 Statistics:
 packets: received 0 (multicast 0, broadcast 0, unknown
unicast 0, unicast 0), sent 45573594908
 bytes: received 0 (multicast 0, broadcast 0, unknown unicast
0, unicast 0), sent 8750130222336
 MAC move: 0
 ........

Verify the EVPN EVI information with the VPN-ID and MAC address filter. 


RP/0/RSP0/CPU0:router# show evpn evi vpn-id 2001 neighbor

Neighbor IP    vpn-id
-----------   --------
209.165.200.225   2001
209.165.201.30   2001

Verify the BGP L2VPN EVPN summary. 


RP/0/RSP0/CPU0:router# show bgp l2vpn evpn summary
...
Neighbor        Spk   AS     MsgRcvd  MsgSent  TblVer    InQ  OutQ  Up/Down  St/PfxRcd
209.165.200.225  0    200     216739  229871   200781341  0    0     3d00h   348032
209.165.201.30   0    200     6462962 4208831  200781341  10   0     2d22h   35750

Verify the MAC updates to the L2FIB table in a line card. 


RP/0/RSP0/CPU0:router# show l2vpn mac mac all location 

Topo ID Producer Next Hop(s)     Mac Address    IP Address
------- -------- -----------     -------------- ----------
1112    0/6/CPU0 Te0/0/0/1 00a3.0001.0001

Verify the MAC updates to the L2FIB table in a route switch processor (RSP). 


RP/0/RSP0/CPU0:router# show l2vpn mac mac all location 

Topo ID  Producer Next Hop(s)     Mac Address    IP Address
-------  -------- -----------     -------------- ----------
1112     0/6/CPU0 0/0/0/1 00a3.0001.0001

Verify the summary information for the MAC address. 


RP/0/RSP0/CPU0:router# show l2vpn forwarding bridge-domain EVPN_ALL_ACTIVE:EVPN_2001 mac-address location 

.....
Mac Address     Type      Learned from/Filtered on   LC learned   Resync Age/Last Change
Mapped to
0000.2001.5555  dynamic   Te0/0/0/2           N/A          11 Jan 14:37:22
N/A <-- local dynamic
00bb.2001.0001 dynamic    Te0/0/0/2           N/A          11 Jan 14:37:22
N/A
0000.2001.1111 EVPN       BD id: 1110                N/A 									N/A
N/A <-- remote static
00a9.2002.0001 EVPN 						BD id: 1110 															N/A 									N/A
N/A

Verify the EVPN EVI information with the VPN-ID and MAC address filter. 


RP/0/RSP0/CPU0:router# show evpn evi vpn-id 2001 mac

EVI 			MAC address 			 IP address 							Nexthop 					Label
---- 		------------- 	 -----------       -------      ------
2001 		00a9.2002.0001  :: 															10.10.10.10  34226      <-- Remote MAC
2001 		00a9.2002.0001  :: 															209.165.201.30  34202

2001 		0000.2001.5555  20.1.5.55 			     TenGigE0/0/0/2 34203    <-- local MAC



RP/0/RSP0/CPU0:router# RP/0/RSP0/CPU0:router# show evpn evi vpn-id 2001 mac 00a9.2002.0001 detail

EVI     MAC address      IP address  Nexthop      Label
----    --------------   ----------  -------      ----- 
2001    00a9.2002.0001   ::          10.10.10.10  34226

2001    00a9.2002.0001   ::          209.165.201.30  34202

 Ethernet Tag : 0
 Multi-paths Resolved : True <--- aliasing to two remote PE with All-Active load balancing

 Static : No
 Local Ethernet Segment : N/A
 Remote Ethernet Segment : 0100.211b.fce5.df00.0b00
 Local Sequence Number : N/A
 Remote Sequence Number : 0
 Local Encapsulation : N/A
 Remote Encapsulation : MPLS

Verify the BGP routes associated with EVPN with bridge-domain filter. 



RP/0/RSP0/CPU0:router# show bgp l2vpn evpn bridge-domain EVPN_2001 route-type 2

*> [2][0][48][00bb.2001.0001][0]/104
                        0.0.0.0           0 i <------ locally learnt MAC
*>i[2][0][48][00a9.2002.00be][0]/104
  																						10.10.10.10 100 			0 i <----- remotely learnt MAC
* i 209.165.201.30 100 0 i

EVPN Out of Service

The EVPN Out of Service feature enables you to control the state of bundle interfaces that are part of an Ethernet segment that have Link Aggregation Control protocol (LACP) configured. This feature enables you to put a node out of service (OOS) without having to manually shutdown all the bundles on their provider edge (PE).

Use the cost-out command to bring down all the bundle interfaces belonging to an Ethernet VPN (EVPN) Ethernet segment on a node. The Ethernet A-D Ethernet Segment (ES-EAD) routes are withdrawn before shutting down the bundles. The PE signals to the connected customer edge (CE) device to bring down the corresponding bundle member. This steers away traffic from this PE node without traffic disruption. The traffic that is bound for the Ethernet segment from the CE is directed to the peer PE in a multi-homing environment.


Note

EVPN cost-out is supported only on manually configured ESIs.

In the following topology, the CE is connected to PE1 and PE2. When you configure the cost-out command on PE1, all the bundle interfaces on the Ethernet segment are brought down. Also, the corresponding bundle member is brought down on the CE. Hence, the traffic for this Ethernet segment is now sent to PE2 from the CE.

Figure 5. EVPN Out of Service


To bring up the node into service, use no cost-out command. This brings up all the bundle interfaces belonging to EVPN Ethernet segment on the PE and the corresponding bundle members on the CE.

When the node is in cost-out state, adding a new bundle Ethernet segment brings that bundle down. Similarly, removing the bundle Ethernet segment brings that bundle up.

Use startup-cost-in command to bring up the node into service after the specified time on reload. The node will cost-out when EVPN is initialized and remain cost-out until the set time. If you execute evpn no startup-cost-in command while timer is running, the timer stops and node is cost-in.

The 'cost-out' configuration always takes precedence over the 'startup-cost-in' timer. So, if you reload with both the configurations, cost-out state is controlled by the 'cost-out' configuration and the timer is not relevant. Similarly, if you reload with the startup timer, and configure 'cost-out' while timer is running, the timer is stopped and OOS state is controlled only by the 'cost-out' configuration.

If you do a proc restart while the startup-cost-in timer is running, the node remains in cost-out state and the timer restarts.

Configure EVPN Out of Service

This section describes how you can configure EVPN Out of Service. 

/* Configuring node cost-out on a PE */

Router# configure
Router(config)# evpn
Router(config-evpn)# cost-out
Router(config-evpn)commit

/* Bringing up the node into service */

Router# configure
Router(config)# evpn
Router(config-evpn)# no cost-out
Router(config-evpn)commit

/* Configuring the timer to bring up the node into service after the specified time on reload */

Router# configure
Router(config)# evpn
Router(config-evpn)# startup-cost-in 6000
Router(config-evpn)commit

Running Configuration 


configure
evpn
 cost-out
!

configure
evpn
 startup-cost-in 6000 
!
Verification
Verify the EVPN Out of Service configuration. 

/* Verify the node cost-out configuration */

Router# show evpn summary
Fri Apr  7 07:45:22.311 IST
Global Information
-----------------------------
Number of EVIs                : 2
Number of Local EAD Entries   : 0
Number of Remote EAD Entries  : 0
Number of Local MAC Routes    : 0
Number of Local MAC Routes    : 5
          MAC                 : 5
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local ES:Global MAC : 12
Number of Remote MAC Routes   : 7
          MAC                 : 7
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local IMCAST Routes : 56
Number of Remote IMCAST Routes: 56
Number of Internal Labels     : 5
Number of ES Entries          : 9
Number of Neighbor Entries    : 1
EVPN Router ID                : 192.168.0.1
BGP Router ID                 : ::
BGP ASN                       : 100
PBB BSA MAC address           : 0207.1fee.be00
Global peering timer          :      3 seconds
Global recovery timer         :     30 seconds
EVPN cost-out                 : TRUE
      startup-cost-in timer   : Not configured


/* Verify the no cost-out configuration */

Router# show evpn summary
Fri Apr  7 07:45:22.311 IST
Global Information
-----------------------------
Number of EVIs                : 2
Number of Local EAD Entries   : 0
Number of Remote EAD Entries  : 0
Number of Local MAC Routes    : 0
Number of Local MAC Routes    : 5
          MAC                 : 5
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local ES:Global MAC : 12
Number of Remote MAC Routes   : 7
          MAC                 : 7
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local IMCAST Routes : 56
Number of Remote IMCAST Routes: 56
Number of Internal Labels     : 5
Number of ES Entries          : 9
Number of Neighbor Entries    : 1
EVPN Router ID                : 192.168.0.1
BGP Router ID                 : ::
BGP ASN                       : 100
PBB BSA MAC address           : 0207.1fee.be00
Global peering timer          :      3 seconds
Global recovery timer         :     30 seconds
EVPN cost-out                 : FALSE
      startup-cost-in timer   : Not configured


/* Verify the startup-cost-in timer configuration */

Router# show evpn summary
Fri Apr  7 07:45:22.311 IST
Global Information
-----------------------------
Number of EVIs                : 2
Number of Local EAD Entries   : 0
Number of Remote EAD Entries  : 0
Number of Local MAC Routes    : 0
Number of Local MAC Routes    : 5
          MAC                 : 5
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local ES:Global MAC : 12
Number of Remote MAC Routes   : 7
          MAC                 : 7
          MAC-IPv4            : 0
          MAC-IPv6            : 0
Number of Local IMCAST Routes : 56
Number of Remote IMCAST Routes: 56
Number of Internal Labels     : 5
Number of ES Entries          : 9
Number of Neighbor Entries    : 1
EVPN Router ID                : 192.168.0.1
BGP Router ID                 : ::
BGP ASN                       : 100
PBB BSA MAC address           : 0207.1fee.be00
Global peering timer          :      3 seconds
Global recovery timer         :     30 seconds
EVPN node cost-out            : TRUE
        startup-cost-in timer : 6000

EVPN Multiple Services per Ethernet Segment

EVPN Multiple Services per Ethernet Segment feature allows you to configure multiple services over single Ethernet Segment (ES). Instead of configuring multiple services over multiple ES, you can configure multiple services over a single ES.

You can configure the following services on a single Ethernet Bundle; you can configure one service on each sub-interface.

  • Flexible cross-connect (FXC) service. It supports VLAN Unaware, VLAN Aware, and Local Switching modes.

    For more information, see Configure Point-to-Point Layer 2 Services chapter in L2VPN and Ethernet Services Configuration Guide for Cisco NCS 5500540 Series Routers.

  • EVPN-VPWS Xconnect service

    For more information, see EVPN Virtual Private Wire Service (VPWS) chapter in L2VPN and Ethernet Services Configuration Guide for Cisco NCS 5500540 Series Routers.

  • EVPN Integrated Routing and Bridging (IRB)

    For more information, see Configure EVPN IRB chapter in L2VPN and Ethernet Services Configuration Guide for Cisco NCS 5500540 Series Routers.

  • Native EVPN

    For more information see, EVPN Features chapter in L2VPN and Ethernet Services Configuration Guide for Cisco NCS 5500540 Series Routers.

All these services are supported only on all-active multihoming scenario.

Configure EVPN Multiple Services per Ethernet Segment

Consider a customer edge (CE) device connected to two provider edge (PE) devices through Ethernet Bundle interface 22001. Configure multiple services on Bundle Ethernet sub-interfaces.

Configuration Example

Consider Bundle-Ether22001 ES, and configure multiple services on sub-interface. 


/* Configure attachment circuits */
Router# configure
Router(config)# interface Bundle-Ether22001.12 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 12
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.13 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 13
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.14 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 14
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.1 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 1
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.2 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 2
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.3 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 3
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit
Router(config)# interface Bundle-Ether22001.4 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 4
Router(config-l2vpn-subif)# exit
Router(config-l2vpn)# exit

/*Configure VLAN Unaware FXC Service */
Router(config)# l2vpn
Router(config-l2vpn)# flexible-xconnect-service vlan-unaware fxc_mh1
Router(config-l2vpn-fxs-vu)# interface Bundle-Ether22001.1
Router(config-l2vpn-fxs-vu)# interface Bundle-Ether22001.2
Router(config-l2vpn-fxs-vu)# interface Bundle-Ether22001.3
Router(config-l2vpn-fxs-vu)# neighbor evpn evi 21006 target 22016
Router(config-l2vpn-fxs-vu)# commit

/* Configure VLAN Aware FXC Service */
Router(config)# l2vpn
Router(config-l2vpn)# flexible-xconnect-service vlan-aware evi 24001
Router(config-l2vpn-fxs-va)# interface Bundle-Ether22001.12
Router(config-l2vpn-fxs-va)# interface Bundle-Ether22001.13
Router(config-l2vpn-fxs-va)# interface Bundle-Ether22001.14
Router(config-l2vpn-fxs-va)# commit

/* Configure Local Switching - Local switching is supported only on VLAN-aware FXC */
PE1
Router# configure
Router(config)# l2vpn
Router(config-l2vpn)# flexible-xconnect-service vlan-aware evi 31400
Router(config-l2vpn-fxs-va)# interface Bundle-Ether22001.1400 
Router(config-l2vpn-fxs-va)# interface Bundle-Ether23001.1400 
Router(config-l2vpn-fxs-va)# commit
Router(config-l2vpn-fxs)# exit
PE2
Router# configure
Router(config)# l2vpn
Router(config-l2vpn)# flexible-xconnect-service vlan-aware evi 31401
Router(config-l2vpn-fxs-va)# interface Bundle-Ether22001.1401 
Router(config-l2vpn-fxs-va)# interface Bundle-Ether23001.1401 
Router(config-l2vpn-fxs-va)# commit
Router(config-l2vpn-fxs)# exit

/* Configure EVPN-VPWS xconnect service and native EVPN with IRB */

Router# configure
Router(config)# interface Bundle-Ether22001.11 l2transport
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q 11
Router(config-l2vpn-subif)# rewrite ingress tag pop 2 symmetric
Router(config-l2vpn-subif)# commit
Router(config-l2vpn-subif)# exit

Router# configure
Router(config)# interface Bundle-Ether22001.21 l2transport 
Router(config-l2vpn-subif)# encapsulation dot1q 1 second-dot1q  21
Router(config-l2vpn-subif)# rewrite ingress tag pop 2 symmetric
Router(config-l2vpn-subif)# commit
Router(config-l2vpn-subif)# exit

Router# configure
Route(config)# l2vpn
Router(config-l2vpn)# xconnect group xg22001
Router(config-l2vpn-xc)# p2p evpn-vpws-mclag-22001
Router(config-l2vpn-xc-p2p)# interface Bundle-Ether22001.11  
Router(config-l2vpn-xc-p2p)# neighbor evpn evi 22101 target 220101 source 220301
Router(config-l2vpn-xc-p2p-pw)# commit
Router(config-l2vpn-xc-p2p-pw)# exit

Router # configure
Router (config)# l2vpn
Router (config-l2vpn)# bridge group native_evpn1
Router (config-l2vpn-bg)#  bridge-domain bd21  
Router (config-l2vpn-bg-bd)# interface Bundle-Ether22001.21
Router (config-l2vpn-bg-bd-ac)# routed interface BVI21
Router (config-l2vpn-bg-bd-bvi)# evi 22021
Router (config-l2vpn-bg-bd-bvi)# commit
Router (config-l2vpn-bg-bd-bvi)# exit

/* Configure Native EVPN */
Router # configure
Router (config)# evpn
Router (config-evpn)# interface Bundle-Ether22001
Router (config-evpn-ac)# ethernet-segment identifier type 0 ff.ff.ff.ff.ff.ff.ff.ff.ee
Router (config-evpn-ac-es)# bgp route-target 2200.0001.0001
Router (config-evpn-ac-es)# exit
Router (config-evpn)# evi 24001 
Router (config-evpn-evi)# bgp
Router (config-evpn-evi-bgp)# route-target import 64:24001  
Router (config-evpn-evi-bgp)# route-target export 64:24001
Router (config-evpn-evi-bgp)# exit
Router (config-evpn-evi)# exit
Router (config-evpn)# evi 21006
Router (config-evpn-evi)# bgp
Router (config-evpn-evi-bgp)# route-target route-target 64:10000
Router (config-evpn-evi-bgp)# exit
Router (config-evpn-evi)# exit
Router (config-evpn)# evi 22101 
Router (config-evpn-evi)# bgp
Router (config-evpn-evi-bgp)# route-target import 64:22101
Router (config-evpn-evi-bgp)# route-target export 64:22101
Router (config-evpn-evi-bgp)# exit
Router (config-evpn-evi)# exit
Router (config-evpn)# evi 22021
Router (config-evpn-evi)# bgp
Router (config-evpn-evi-bgp)# route-target import 64: 22021
Router (config-evpn-evi-bgp)# route-target export 64: 22021
Router (config-evpn-evi-bgp)# exit
Router (config-evpn-evi)# exit
Router (config-evpn-evi)# advertise-mac
Router (config-evpn-evi)# exit
Router (config-evpn)# evi 22022
Router (config-evpn-evi)# bgp
Router (config-evpn-evi-bgp)# route-target import 64: 22022
Router (config-evpn-evi-bgp)# route-target export 64: 22022
Router (config-evpn-evi-bgp)# exit
Router (config-evpn-evi)# advertise-mac
Router (config-evpn-evi)# commit
Router (config-evpn-evi)# exit

Running Configuration


/* Configure attachment circuits */
interface Bundle-Ether22001.12 l2transport 
encapsulation dot1q 1 second-dot1q 12
!
interface Bundle-Ether22001.13 l2transport 
encapsulation dot1q 1 second-dot1q 13
!
interface Bundle-Ether22001.14 l2transport 
encapsulation dot1q 1 second-dot1q 14
!
interface Bundle-Ether22001.1 l2transport
 encapsulation dot1q 1 second-dot1q 1
!
interface Bundle-Ether22001.2 l2transport 
encapsulation dot1q 1 second-dot1q 2
!
interface Bundle-Ether22001.3 l2transport 
encapsulation dot1q 1 second-dot1q 3
!
interface Bundle-Ether22001.4 l2transport 
encapsulation dot1q 1 second-dot1q 4

/*Configure VLAN Unaware FXC Service */
flexible-xconnect-service vlan-unaware fxc_mh1
  interface Bundle-Ether22001.1 
  interface Bundle-Ether22001.2 
  interface Bundle-Ether22001.3 
 neighbor evpn evi 21006 target 22016
!
/*Configure VLAN Aware FXC Service */
l2vpn 
 flexible-xconnect-service vlan-aware evi 24001   
   interface Bundle-Ether22001.12 
   interface Bundle-Ether22001.13 
   interface Bundle-Ether22001.14

/* Configure Local Switching */
flexible-xconnect-service vlan-aware evi 31400  
 interface Bundle-Ether22001.1400 
 interface Bundle-Ether23001.1400 
! 
flexible-xconnect-service vlan-aware evi 31401  
 interface Bundle-Ether22001.1401  
 interface Bundle-Ether23001.1401 
!

/* Configure EVPN-VPWS xconnect service and native EVPN with IRB */
interface Bundle-Ether22001.11 l2transport 
  encapsulation dot1q 1 second-dot1q 11
  rewrite ingress tag pop 2 symmetric
 !
interface Bundle-Ether22001.21 l2transport 
  encapsulation dot1q 1 second-dot1q  21 
  rewrite ingress tag pop 2 symmetric
 !
!
l2vpn 
xconnect group xg22001  
p2p evpn-vpws-mclag-22001  
 interface Bundle-Ether22001.11  
 neighbor evpn evi 22101 target 220101 source 220301  
! 
bridge group native_evpn1 
   bridge-domain bd21  
   interface Bundle-Ether22001.21   
    routed interface BVI21    
     evi 22021  
  !  
/* Configure Native EVPN */
Evpn
 interface Bundle-Ether22001  
  ethernet-segment   identifier type 0 ff.ff.ff.ff.ff.ff.ff.ff.ee 
  bgp route-target 2200.0001.0001
  !
  evi 24001  
   bgp  
    route-target import 64:24001   
    route-target export 64:24001
   !
   evi 21006  
    bgp   
      route-target 64:100006
   !
    evi 22101  
     bgp  
       route-target import 64:22101   
       route-target export 64:22101
     !
   evi 22021 
    bgp   
      route-target import 64:22021  
      route-target export 64:22021  
    !  
    advertise-mac
  !
  evi 22022  
   bgp   
    route-target import 64:22022  
    route-target export 64:22022  
   ! 
    advertise-mac
  !
Verification
Verify if each of the services is configured on the sub-interface. 

Router# show l2vpn xconnect summary
Number of groups: 6
Number of xconnects: 505  Up: 505  Down: 0  Unresolved: 0 Partially-programmed: 0  
AC-PW: 505  AC-AC: 0  PW-PW: 0 Monitor-Session-PW: 0
Number of Admin Down segments: 0
Number of MP2MP xconnects: 0  
 Up 0 Down 0  
Advertised: 0 Non-Advertised: 0

 

Router# show l2vpn flexible-xconnect-service summary
Number of flexible xconnect services: 74 
 Up: 74 

Router# show l2vpn flexible-xconnect-service name fxc_mh1 
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
SB = Standby, SR = Standby Ready, (PP) = Partially Programmed
Flexible XConnect Service  Segment 
Name 			ST 	Type  Description 	ST
------------------------ ----------------------------- -----------------------------
fxc_mh1 UP 	AC: 		BE22001.1 			UP
								   	AC: 		BE22001.2 			UP 
												AC: 		BE22001.3 			UP
----------------------------------------------------------------------------------------



Router# show l2vpn flexible-xconnect-service name evi:24001 

Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
SB = Standby, SR = Standby Ready, (PP) = Partially Programmed
Flexible XConnect Service  Segment 
Name 					ST 	Type  Description 	ST
------------------------ ----------------------------- -----------------------------
evi:24001 UP 	AC: 		BE22001.11 			UP
								   			AC: 		BE22001.12 			UP 
														AC: 		BE22001.13 			UP
														AC: 		BE22001.14 			UP
----------------------------------------------------------------------------------------


Router# show l2vpn xconnect group xg22001 xc-name evpn-vpws-mclag-22001
Fri Sep 1 17:28:58.259 UTC
Legend: ST = State, UP = Up, DN = Down, AD = Admin Down, UR = Unresolved,
SB = Standby, SR = Standby Ready, (PP) = Partially Programmed
XConnect 																															Segment 1 										Segment 2
Group 				Name 																		ST 				Description ST 					Description 																ST
------------------------ ----------------------------- -----------------------------------
xg22001 	evpn-vpws-mclag-22001 		UP 			BE22001.101 	UP 					EVPN 22101, 220101,64.1.1.6 UP
------------------------------------------------------------------------------------------

Associated Commands

  • evpn

  • evi

  • ethernet-segment

  • advertise-mac

  • show evpn ethernet-segment

  • show evpn evi

  • show evpn summary

  • show l2vpn xconnect summary

  • show l2vpn flexible-xconnect-service

  • show l2vpn xconnect group

Network Convergence using Core Isolation Protection

The Network Convergence using Core Isolation Protection feature allows the router to converge fast when remote links and local interfaces fail. This feature reduces the duration of traffic drop by rapidly rerouting traffic to alternate paths. This feature uses Object Tracking (OT) to detect remote link failure and failure of connected interfaces.

Tracking interfaces can only detect failure of connected interfaces and not failure of a remote router interfaces that provides connectivity to the core. Tracking one or more BGP neighbor sessions along with one or more of the neighbor’s address-families enables you to detect remote link failure.

Object Tracking

Object tracking (OT) is a mechanism for tracking an object to take any client action on another object as configured by the client. The object on which the client action is performed may not have any relationship to the tracked objects. The client actions are performed based on changes to the properties of the object being tracked.

You can identify each tracked object by a unique name that is specified by the track command in the configuration mode.

The tracking process receives the notification when the tracked object changes its state. The state of the tracked objects can be up or down.

You can also track multiple objects by a list. You can use a flexible method for combining objects with Boolean logic. This functionality includes:

  • Boolean AND function—When a tracked list has been assigned a Boolean AND function, each object defined within a subset must be in an up state, so that the tracked object can also be in the up state.

  • Boolean OR function—When the tracked list has been assigned a Boolean OR function, it means that at least one object defined within a subset must also be in an up state, so that the tracked object can also be in the up state.

For more information on OT, see the Configuring Object Tracking chapter in the System Management Configuration Guide for Cisco NCS 5500 Series Routers.

Figure 6. EVPN Convergence Using Core Isolation Protection

Consider a traffic flow from CE1 to PE1. The CE1 can send the traffic either from Leaf1-1 or Leaf1-2. When Leaf1-1 loses the connectivity to both the local links and remote link, BGP sessions to both route reflectors (RRs) are down; the Leaf1-1 brings down the Bundle-Ether14 connected to CE1. The CE1 redirects the traffic from Leaf1-2 to PE1.

You can track the connected interfaces to identify the connected link failures. However, if there is a remote link failure, tracking connected interfaces does not identify the remote link failures. You must track BGP sessions to identify the remote link failure.


Note

When you configure the bgp graceful-restart command, unconfiguring a neighbor is considered as a non-gr event. This generates a BGP notification to the neighbor before the neighbor is unconfigured.

On the remote router, if the track is configured for this neighbor, the track state is brought down immediately.

However, certain configurations are treated as graceful reset reason and when unconfigured they supress the BGP notification to the neighbor. The route-reflector-client configuration under the neighbor or neighbor address-family is one of the examples.

On the remote router, if the track is configured for this neighbor, the track state is not brought down immediately because a notification is not received.

To overcome this situation, shutdown the neighbor before unconfiguring the neighbor. This generates a BGP notification to the neighbor, and any track configured for the neighbor is brought down immediately.

Configure EVPN Convergence using Core Isolation Protection

A tracked list contains one or more objects. The Boolean expression enables tracking objects using either AND or OR operators. For example, when tracking two interfaces, using the AND operator, up means that both interfaces are up, and down means that either interface is down.


Note

An object must exist before it can be added to a tracked list.

The NOT operator is specified for one or more objects and negates the state of the object.

After configuring the tracked object, you must associate the neighbor or interface whose state must be tracked.

Perform the following tasks to configure EVPN convergence using core isolation protection:

  • Configure BGP

  • Track the Line Protocol State of an Interface

  • Track neighbor adress-family state

  • Track objects for both interfaces and neighbors

Configuration Example

In this example, Leaf1-1 brings the down the AC connected to CE1 when:

Both local interfaces GigabitEthernet0/4/0/0 and GigabitEthernet0/4/0/1of Leaf1-1 are down.

OR

Leaf1-1 BGP sessions to both RRs are down.

CE1 re-directs the traffic it was sending to Leaf1-1 to Leaf1-2.

Perform the following tasks on Leaf1-1:


/* Configure BGP */
Router# configure
Router(config)# router bgp 100
Router(config-bgp)# address-family l2vpn evpn
Router(config-bgp-af)# exit
Router(config-bgp)# neighbor 172.16.0.1
Router(config-bgp-nbr)# remote-as 100
Router(config-bgp-nbr)# address-family l2vpn evpn
Router(config-bgp-nbr-af)# neighbor 172.16.0.1
Router(config-bgp-nbr)# remote-as 100
Router(config-bgp-nbr)# address-family l2vpn evpn
Router(config-bgp-nbr-af)# commit

/* Track the Line Protocol State of an Interface */
Router# configure
Router(config)# track interface-1
Router(config-track)# type line-protocol state
Router(config-track-line-prot)# interface GigabitEthernet0/4/0/0
Router(config-track-line-prot)#exit
Router(config-track)#exit
Router(config)# track interface-2
Router(config-track)# type line-protocol state
Router(config-track-line-prot)# interface GigabitEthernet0/4/0/1
Router(config-track-line-prot)#exit
Router(config-track)#exit
Router(config)# track interface-group-1 
Router(config-track)# type list boolean or
Router(config-track-list-boolean)# object interface-1
Router(config-track-list-boolean)# object interface-2
Router(config-track-list-boolean)# commit

/* Track neighbor address-family state */
Router# configure
Router(config)# track neighbor-A
Router(config-track)# type bgp neighbor address-family state
Router(config-track-bgp-nbr-af)# address-family l2vpn evpn
Router(config-track-bgp-neighbor)# neighbor 172.16.0.1
Router(config-track-bgp-neighbor)# exit
Router(config-track-bgp-nbr-af)# exit
Router(config-track)# exit
Router(config)# track neighbor-B
Router(config-track)# type bgp neighbor address-family state
Router(config-track-bgp-nbr-af)# address-family l2vpn evpn
Router(config-track-bgp-neighbor)# neighbor 172.16.0.2
Router(config-track-bgp-neighbor)# exit
Router(config-track-bgp-nbr-af)# exit
Router(config-track)# exit
Router(config)# track neighbor-group-1
Router(config-track)# type list boolean or
Router(config-track-list-boolean)# object neighbor-A
Router(config-track-list-boolean)# object neighbor-B
Router(config-track-list-boolean)# commit

/* Track objects for both interfaces and neighbors */
Router# configure
Router(config)# track core-group-1
Router(config-track)# type list boolean and
Router(config-track-list-boolean)# object neighbor-group-1
Router(config-track-list-boolean)# object interface-group-1
Router(config-track-list-boolean)# action
Router(config-track-action)# track-down error-disable interface Bundle-Ether14 auto-recover
Router(config-track-action)# commit

Running Configuration

This section shows EVPN convergence using core isolation protection running configuration.


router bgp 100
 address-family l2vpn evpn
 !
 neighbor 172.16.0.1
  remote-as 100
  address-family l2vpn evpn
  !
 !
 neighbor 172.16.0.2
  remote-as 100
  address-family l2vpn evpn
  !
 !
!

track interface-1
 type line-protocol state
  interface GigabitEthernet0/4/0/0
 !
!
track interface-2
 type line-protocol state
  interface GigabitEthernet0/4/0/1
 !
!
track interface-group-1
 type list boolean or
  object interface-1
  object interface-2
 !
!

track neighbor-A
 type bgp neighbor address-family state
  address-family l2vpn evpn
   neighbor 172.16.0.1
  !
 !
!
track neighbor-B
 type bgp neighbor address-family state
  address-family l2vpn evpn
   neighbor 172.16.0.1
  !
 !
!    

track neighbor-group-1
 type list boolean or
  object neighbor-A
  object neighbor-B
  !
 !
!
track core-group-1
 type list boolean and
  object neighbor-group-1
  object interface-group-1
 !
 action
  track-down error-disable interface Bundle-Ether14 auto-recover
  !
 !

Verification

Verify that you have configured the EVPN convergence using core isolation protection feature successfully.


Router# show track
Wed May 27 04:42:11.995 UTC

Track neighbor-A 
        BGP Neighbor AF L2VPN EVPN NBR 172.16.0.1 vrf default
        Reachability is UP 
                Neighbor Address Reachablity is Up
                BGP Neighbor Address-family state is Up
        4 changes, last change UTC Tue May 26 2020 20:14:33.171

Track neighbor-B 
        BGP Neighbor AF L2VPN EVPN NBR 172.16.0.2 vrf default
        Reachability is UP 
                Neighbor Address Reachablity is Up
                BGP Neighbor Address-family state is Up
        4 changes, last change UTC Tue May 26 2020 20:14:27.527

Track core-group-1 
        List boolean and is UP 
        2 changes, last change 20:14:27 UTC Tue May 26 2020
                object interface-group-1 UP
                object neighbor-group-1 UP

Track interface-1 
        Interface GigabitEthernet0/4/0/0 line-protocol
        Line protocol is UP 
        2 changes, last change 20:13:32 UTC Tue May 26 2020

Track interface-2 
        Interface GigabitEthernet0/4/0/1 line-protocol
        Line protocol is UP 
        2 changes, last change 20:13:28 UTC Tue May 26 2020

Track interface-group-1
        List boolean or is UP 
        2 changes, last change 20:13:28 UTC Tue May 26 2020
                object interface-2 UP
                object interface-1 UP

Track neighbor-group-1
        List boolean or is UP 
        2 changes, last change 20:14:27 UTC Tue May 26 2020
                object neighbor-A UP
                object neighbor-B UP


Router# show track brief
Wed May 27 04:39:19.740 UTC
Track                            Object                                    Parameter         Value                
--------------------------------------------------------------------------------------------------------------
neighbor-A                       bgp nbr L2VPN EVPN 172.16.0.1 vrf defau reachability     Up            
neighbor-B                       bgp nbr L2VPN EVPN 172.16.0.1 vrf defau reachability     Up            
core-group-1                     list                                      boolean and      Up   
interface-1                      interface GigabitEthernet0/4/0/0          line protocol    Up   
interface-2                      interface GigabitEthernet0/4/0/1          line protocol    Up   
interface-group-1                list                                      boolean or       Up   
neighbor-group-1                 list                                      boolean or       Up   
---------------------------------------------------------------------------------------------------------------

Router# show bgp track 
Wed May 27 05:05:51.285 UTC

VRF                    Address-family       Neighbor         Status     Flags

default                L2VPN EVPN           172.16.0.1     UP         0x01
default                L2VPN EVPN           172.16.0.2     UP         0x01

Processed 2 entries

Conditional Advertisement of Default-Originate

The router advertises the default-originate (0.0.0.0/0) towards the network fabric only upon receiving all the core routes. The router withdraws the advertisement of default-originate when the core is isolated. To avoid traffic drop, install the routes in the hardware. To accommodate an additional delay for the routes to be installed in the hardware, you can configure a timeout for the installed routes.

Figure 7. Advertisement of default-originate

In this topology, PE3 advertises the default-originate to CE only when the PE3 session to RR is established and all the routes are received from the RR.

Configure Conditional Advertisement of Default-Originate

Perform the following tasks to configure conditional advertisement of default-originate.

  • Configure BGP

  • Configure RPL

  • Track BGP neighbor address-family state

Configuration Example

Perform the following task on PE3:


/* Configure BGP */
Router# configure
Router(config)# router bgp 100
Router(config-bgp)# bgp router-id 192.0.2.1
Router(config-bgp)# address-family vpnv4 unicast
Router(config-bgp-af)# exit
Router(config-bgp)# neighbor 172.16.0.5
Router(config-bgp-nbr)# remote-as 200
Router(config-bgp-nbr)# address-family vpnv4 unicast
Router(config-bgp-nbr-af)# exit
Router(config-bgp-nbr)# exit
Router(config-bgp)# vrf cust1
Router(config-bgp-vrf)# rd auto
Router(config-bgp-vrf)# address-family ipv4 unicast
Router(config-bgp-vrf-af)# redistribute connected
Router(config-bgp-vrf-af)# redistribute static
Router(config-bgp-vrf-af)# exit
Router(config-bgp-vrf)# neighbor 172.16.0.5
Router(config-bgp-vrf-nbr)# remote-as 200
Router(config-bgp-vrf-nbr)# address-family ipv4 unicast
Router(config-bgp-vrf-nbr-af)# default-originate route-policy track-bgp-core-policy
Router(config-bgp-vrf-nbr-af)# route-policy pass in
Router(config-bgp-vrf-nbr-af)# route-policy pass out
Router(config-bgp-vrf-nbr-af) commit

/* Configure RPL */
Router# configure
Router(config)# route-policy track-bgp-core-policy
Router(config-rpl)# if track core-group-1 is up then
Router(config-rpl-if)# pass
Router(config-rpl-if)# endif
Router(config-rpl)# end-policy
Router(config)# commit


/* Track BGP neighbor address-family state */
Router# configure
Router(config)# track core-group-1
Router(config-track)# type bgp neighbor address-family state
Router(config-track-bgp-nbr-af)# address-family vpnv4 unicast
Router(config-track-bgp-neighbor)# neighbor 172.16.0.5
Router(config-track-bgp-neighbor)# commit

Running Configuration

This section shows conditional advertisement of default-originate running configuration.


configure
 router bgp 100
  bgp router-id 192.0.2.1
  address-family vpnv4 unicast
!
 neighbor 172.16.0.5
  remote-as 200
  address-family vpnv4 unicast
!

 vrf cust1
  rd auto
  address-family ipv4 unicast
   redistribute connected
   redistribute static
!
 neighbor 172.16.0.5
  remote-as 200
  address-family ipv4 unicast
   default-originate route-policy track-bgp-core-policy
   route-policy pass in
   route-policy pass out
!

route-policy track-bgp-core-policy
 if track core-group-1 is up then
  pass
  endif
 end-policy
!
track network-core
 type bgp neighbor address-family state
  address-family vpnv4 unicast
   neighbor 172.16.0.5
!

Verification

Verify conditional advertisement of default-originate.


Router# show rpl active route-policy
Wed May 27 06:54:31.902 UTC

ACTIVE -- Referenced by at least one policy which is attached
INACTIVE -- Only referenced by policies which are not attached
UNUSED -- Not attached (directly or indirectly) and not referenced

The following policies are (ACTIVE)
------------------------------------------
    track-bgp-core
-------------------------------------------
Router# show rpl route-policy track-bgp-core-policy                 
Wed May 27 06:54:38.090 UTC
route-policy track-bgp-core-policy
  if track core-group-1 is up then
    pass
  endif
end-policy
!

Router# show bgp policy route-policy track-bgp-core-policy summary 
Wed May 27 06:54:42.823 UTC
Network            Next Hop        From            Advertised to
0.0.0.0/0          0.0.0.0         Local           172.16.0.5


Router# show bgp neighbor 172.16.0.5
Wed May 27 06:55:39.535 UTC

BGP neighbor is 172.16.0.5
 Remote AS 9730, local AS 9730, internal link
 Remote router ID 172.16.0.5
  BGP state = Established, up for 10:41:12
[snip]
 For Address Family: IPv4 Unicast
  BGP neighbor version 2
  Update group: 0.4 Filter-group: 0.1  No Refresh request being processed
  Default information originate: default route-policy track-bgp-core-policy, default sent
  AF-dependent capabilities:
[snip]
  Track Enabled, Status UP, Nbr GR state Not Enabled, EOR tmr Not Running
  Advertise routes with local-label via Unicast SAFI

EVPN Routing Policy

The EVPN Routing Policy feature provides the route policy support for address-family L2VPN EVPN. This feature adds EVPN route filtering capabilities to the routing policy language (RPL). The filtering is based on various EVPN attributes.

A routing policy instructs the router to inspect routes, filter them, and potentially modify their attributes as they are accepted from a peer, advertised to a peer, or redistributed from one routing protocol to another.

This feature enables you to configure route-policies using EVPN network layer reachability information (NLRI) attributes of EVPN route type 1 to 5 in the route-policy match criteria, which provides more granular definition of route-policy. For example, you can specify a route-policy to be applied to only certain EVPN route-types or any combination of EVPN NLRI attributes. This feature provides flexibility in configuring and deploying solutions by enabling route-policy to filter on EVPN NLRI attributes.

To implement this feature, you need to understand the following concepts:

  • Routing Policy Language

  • Routing Policy Language Structure

  • Routing Policy Language Components

  • Routing Policy Language Usage

  • Policy Definitions

  • Parameterization

  • Semantics of Policy Application

  • Policy Statements

  • Attach Points

For information on these concepts, see Implementing Routing Policy.

Currently, this feature is supported only on BGP neighbor "in" and "out" attach points. The route policy can be applied only on inbound or outbound on a BGP neighbor.

EVPN Route Types

The EVPN NLRI has the following different route types:

Route Type 1: Ethernet Auto-Discovery (AD) Route

The Ethernet (AD) routes are advertised on per EVI and per Ethernet Segment Identifier (ESI) basis. These routes are sent per Ethernet segment (ES). They carry the list of EVIs that belong to the ES. The ESI field is set to zero when a CE is single-homed.

An Ethernet A-D route type specific EVPN NLRI consists of the following fields:


NLRI Format: Route-type 1:

[Type][Len][RD][ESI][ETag][MPLS Label]

Net attributes: [Type][RD][ESI][ETag]

Path attributes: [MPLS Label]

Example


route-policy evpn-policy
  if rd in (1.1.1.1:0) [and/or evpn-route-type is 1] [and/or esi in (0a1.a2a3.a4a5.a6a7.a8a9)] [and/or etag is 4294967295] then
    set ..
  endif
end-policy
!
route-policy evpn-policy
  if rd  in (1.1.1.2:0) [and/or evpn-route-type is 1] [and/or esi in (00a1.a2a3.a4a5.a6a7.a8a9)] [and/or etag is 4294967295] then
    set ..
  endif
end-policy

Route Type 2: MAC/IP Advertisement Route

The host's IP and MAC addresses are advertised to the peers within NLRI. The control plane learning of MAC addresses reduces unknown unicast flooding.

A MAC/IP Advertisement Route type specific EVPN NLRI consists of the following fields:


NLRI Format: Route-type 2:

[Type][Len][RD][ESI][ETag][MAC Addr Len][MAC Addr][IP Addr Len][IP Addr][MPLS Label1][MPLS Label2]

Net attributes: [Type][RD][ETag][MAC Addr Len][MAC Addr][IP Addr Len][IP Addr]

Path attributes: [ESI], [MPLS Label1], [MPLS Label2]

Example


route-policy evpn-policy
  if rd in (1.1.1.2:0) [and/or evpn-route-type is 2] [and/or esi in (0000.0000.0000.0000.0000)] [and/or etag is 0] [and/or macaddress in (0013.aabb.ccdd)] [and/or destination in (1.2.3.4/32)] then
    set ..
  endif
end-policy

Route Type 3: Inclusive Multicast Ethernet Tag Route

This route establishes the connection for broadcast, unknown unicast, and multicast (BUM) traffic from a source PE to a remote PE. This route is advertised on per VLAN and per ESI basis.

An Inclusive Multicast Ethernet Tag route type specific EVPN NLRI consists of the following fields:


NLRI Format: Route-type 3:

[Type][Len][RD][ETag][IP Addr Len][Originating Router's IP Addr]

Net attributes: [Type][RD][ETag][IP Addr Len][Originating Router's IP Addr]

Example


route-policy evpn-policy
  if rd  in (1.1.1.1:300) [and/or evpn-route-type is 3] [and/or etag is 0] [and/or evpn-originator in (1.1.1.1)] then
    set ..
  endif
end-policy

Route Type 4: Ethernet Segment Route

Ethernet segment routes enable to connect a CE device to two or PE devices. ES route enables the discovery of connected PE devices that are connected to the same Ethernet segment.

An Ethernet Segment route type specific EVPN NLRI consists of the following fields:



NLRI Format: Route-type 4:

[Type][Len][RD][ESI][IP Addr Len][Originating Router's IP Addr]

Net attributes: [Type][RD][ESI][IP Addr Len][Originating Router's IP Addr]

Example


route-policy evpn-policy
  if rd  in (1.1.1.1:0) [and/or evpn-route-type is 4] [and/or esi in (00a1.a2a3.a4a5.a6a7.a8a9)] [and/or evpn-originator in (1.1.1.1)] then
    set ..
  endif
end-policy

Route Type 5: IP Prefix Route

An IP Prefix Route type specific EVPN NLRI consists of the following fields:


NLRI Format: Route-type 5:

[Type][Len][RD][ESI][ETag][IP Addr Len][IP Addr][GW IP Addr][Label]

Net attributes: [Type][RD][ETag][IP Addr Len][IP Addr]

Path attributes: [ESI], [GW IP Addr], [Label]

Example


route-policy evpn-policy
  if rd in (30.30.30.30:1) [and/or evpn-route-type is 5] [and/or esi in (0000.0000.0000.0000.0000)] [and/or etag is 0] [and/or destination in (12.2.0.0/16)] [and/or evpn-gateway in (0.0.0.0)] then
    set ..
  endif
end-policy

EVPN RPL Attribute

Route Distinguisher

A Route Distinguisher (rd) attribute consists of eight octets. An rd can be specified for each of the EVPN route types. This attribute is not mandatory in route-policy.

Example


rd in (1.2.3.4:0)

EVPN Route Type

EVPN route type attribute consists of one octet. This specifies the EVPN route type. The EVPN route type attribute is used to identify a specific EVPN NLRI prefix format. It is a net attribute in all EVPN route types.

Example


evpn-route-type is 3


The following are the various EVPN route types that can be used:
1 - ethernet-ad
2 – mac-advertisement
3 - inclusive-multicast
4 - ethernet-segment
5 – ip-advertisement

IP Prefix

An IP prefix attribute holds IPv4 or IPv6 prefix match specification, each of which has four parts: an address, a mask length, a minimum matching length, and a maximum matching length. The address is required, but the other three parts are optional. When IP prefix is specified in EVPN route type 2, it represents either a IPv4 or IPv6 host IP Address (/32 or /128). When IP prefix is specified in EVPN route type 5, it represents either IPv4 or IPv6 subnet. It is a net attribute in EVPN route type 2 and 5.

Example


destination in (128.47.10.2/32)
destination in (128.47.0.0/16)
destination in (128:47::1/128)
destination in (128:47::0/112)

esi

An Ethernet Segment Identifier (ESI) attribute consists of 10 octets. It is a net attribute in EVPN route type 1 and 4, and a path attribute in EVPN route type 2 and 5.

Example


esi in (ffff.ffff.ffff.ffff.fff0)

etag

An Ethernet tag attribute consists of four octets. An Ethernet tag identifies a particular broadcast domain, for example, a VLAN. An EVPN instance consists of one or more broadcast domains. It is a net attribute in EVPN route type 1, 2, 3 and 5.

Example


etag in (10000)

mac

The mac attribute consists of six octets. This attribute is a net attribute in EVPN route type 2.

Example


mac in (0206.acb1.e806)

evpn-originator

The evpn-originator attribute specifies the originating router's IP address (4 or 16 octets). This is a net attribute in EVPN route type 3 and 4.

Example


evpn-originator in (1.2.3.4)

evpn-gateway

The evpn-gateway attribute specifies the gateway IP address. The gateway IP address is a 32-bit or 128-bit field (IPv4 or IPv6), and encodes an overlay next-hop for the IP prefixes. The gateway IP address field can be zero if it is not used as an overlay next-hop. This is a path attribute in EVPN route type 5.

Example


evpn-gateway in (1.2.3.4)

EVPN RPL Attribute Set

In this context, the term set is used in its mathematical sense to mean an unordered collection of unique elements. The policy language provides sets as a container for groups of values for matching purposes. Sets are used in conditional expressions. The elements of the set are separated by commas. Null (empty) sets are allowed.

prefix-set

A prefix-set holds IPv4 or IPv6 prefix match specifications, each of which has four parts: an address, a mask length, a minimum matching length, and a maximum matching length. The address is required, but the other three parts are optional. The prefix-set specifies one or more IP prefixes.

Example


prefix-set ip_prefix_set
14.2.0.0/16,
54.0.0.0/16,
12.12.12.0/24,
50:50::1:0/112
end-set

mac-set

The mac-set specifies one or more MAC addresses.

Example


mac-set mac_address_set
1234.2345.6789,
2345.3456.7890
end-set

esi-set

The esi-set specifies one or more ESI's.

Example


esi-set evpn_esi_set
1234.2345.3456.4567.5678,
1234.2345.3456.4567.5670
end-set

etag-set

The etag-set specifies one or more Ethernet tags.

Example


etag-set evpn_etag_set
10000,
20000
end-set

Configure EVPN RPL Feature

The following section describe how to configure mac-set, esi-set, evpn-gateway, and evpn-originator.


/* Configuring a mac-set and refering it in a route-policy (Attach point - neighbor-in) */
Router# configure
Router(config)# mac-set demo_mac_set
Router(config-mac)# 1234.ffff.aaa3,
Router(config-mac)# 2323.4444.ffff
Router(config-mac)# end-set
Router(config)# !
Router(config)# route-policy policy_use_pass_mac_set
Router(config-rpl)# if mac in demo_mac_set then
Router(config-rpl-if)# set med 200
Router(config-rpl-if)# else
Router(config-rpl-else)# set med 1000
Router(config-rpl-else)# endif
Router(config-rpl)# end-policy
Router(config)# commit
Router(config)# router bgp 100
Router(config-bgp)# address-family l2vpn evpn
Router(config-bgp-af)# !
Router(config-bgp-af)# neighbor 10.0.0.10
Router(config-bgp-nbr)# remote-as 8
Router(config-bgp-nbr)# address-family l2vpn evpn
Router(config-bgp-nbr-af)# route-policy policy_use_pass_mac_set in
Router(config-bgp-nbr-af)# commit

/* Configuring a esi-set and refering it in a route-policy (Attach point - neighbor-in) */
Router# configure
Router(config)# esi-set demo_esi
Router(config-esi)# ad34.1233.1222.ffff.44ff,
Router(config-esi)# ad34.1233.1222.ffff.6666
Router(config-esi)# end-set
Router(config)# !
Router(config)# route-policy use_esi
Router(config-rpl)# if esi in demo_esi then
Router(config-rpl-if)# set local-preference 100
Router(config-rpl-if)# else
Router(config-rpl-else)# set local-preference 300
Router(config-rpl-else)# endif
Router(config-rpl)# end-policy
Router(config)# commit

/* Configuring evpn-gateway/evpn-originator in a route-policy (Attach point - neighbor-in and out) */
Router# configure
Router(config)# route-policy gateway_demo
Router(config-rpl)# if evpn-gateway in (10.0.0.0/32) then
Router(config-rpl-if)# pass
Router(config-rpl-if)# endif
Router(config-rpl)# end-policy
Router(config)# commit
Router(config)# route-policy originator_demo
Router(config-rpl)# if evpn-originator in (10.0.0.1/32) then
Router(config-rpl-if)# set local-preference 100
Router(config-rpl-if)# else
Router(config-rpl-else)# set med 200
Router(config-rpl-else)# endif
Router(config-rpl)# end-policy
Router(config)# commit
Router(config)# router bgp 100
Router(config-bgp)# address-family ipv4 unicast
Router(config-bgp-af)# !
Router(config-bgp-af)# neighbor 10.0.0.10
Router(config-bgp-nbr)# remote-as 8
Router(config-bgp-nbr)# address-family ipv4 unicast
Router(config-bgp-nbr-af)# route-policy gateway_demo in
Router(config-bgp-nbr-af)# route-policy originator_demo out
Router(config-bgp-nbr-af)# commit

Running Configuration


/* Configuring a mac-set and refering it in a route-policy (Attach point - neighbor-in) */
mac-set demo_mac_set
  1234.ffff.aaa3,
  2323.4444.ffff
end-set
!
route-policy policy_use_pass_mac_set
  if mac in demo_mac_set then
    set med 200
  else
    set med 1000
  endif
end-policy
!
router bgp 100
 address-family l2vpn evpn
 !
 neighbor 10.0.0.10
  remote-as 8
  address-family l2vpn evpn  
  route-policy policy_use_pass_mac_set in
  !
 !
!
end

/* Configuring a esi-set and refering it in a route-policy (Attach point - neighbor-in) */
Wed Oct 26 11:52:23.720 IST
esi-set demo_esi
  ad34.1233.1222.ffff.44ff,
  ad34.1233.1222.ffff.6666
end-set
!
route-policy use_esi
  if esi in demo_esi then
    set local-preference 100
  else
    set local-preference 300
  endif
end-policy
EVPN Route Policy Examples

route-policy ex_2
  if rd in (2.2.18.2:1004) and evpn-route-type is 1 then
    drop
  elseif rd in (2.2.18.2:1009) and evpn-route-type is 1 then
    drop
  else
    pass
  endif
end-policy
!
route-policy ex_3
  if evpn-route-type is 5 then
    set extcommunity bandwidth (100:9999)
  else
    pass
  endif
end-policy
!
route-policy samp
end-policy
!
route-policy samp1
  if rd in (30.0.101.2:0) then
    pass
  endif
end-policy
!
route-policy samp2
  if rd in (30.0.101.2:0, 1:1) then
    pass
  endif
end-policy
!
route-policy samp3
  if rd in (*:*) then
    pass
  endif
end-policy
!
route-policy samp4
  if rd in (30.0.101.2:*) then
    pass
  endif
end-policy
!
route-policy samp5
  if evpn-route-type is 1 then
    pass
  endif
end-policy
!
route-policy samp6
  if evpn-route-type is 2 or evpn-route-type is 5 then
    pass
  endif
end-policy
!
route-policy samp7
  if evpn-route-type is 4 or evpn-route-type is 3 then
    pass
  endif
end-policy
!
route-policy samp8
  if evpn-route-type is 1 or evpn-route-type is 2 or evpn-route-type is 3 then
    pass
  endif
end-policy
!
route-policy samp9
  if evpn-route-type is 1 or evpn-route-type is 2 or evpn-route-type is 3 or evpn-route-type is 4 then
    pass
  endif
end-policy
!
route-policy test1
  if evpn-route-type is 2 then
    set next-hop 10.2.3.4
  else
    pass
  endif
end-policy
!
route-policy test2
  if evpn-route-type is 2 then
    set next-hop 10.10.10.10
  else
    drop
  endif
end-policy
!
route-policy test3
  if evpn-route-type is 1 then
    set tag 9988
  else
    pass
  endif
end-policy
!
route-policy samp21
  if mac in (6000.6000.6000) then
    pass
  endif
end-policy
!
route-policy samp22
  if extcommunity rt matches-any (100:1001) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp23
  if evpn-route-type is 1 and esi in (aaaa.bbbb.cccc.dddd.eeee) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp24
  if evpn-route-type is 5 and extcommunity rt matches-any (100:1001) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp25
  if evpn-route-type is 2 and esi in (1234.1234.1234.1234.1236) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp26
  if etag in (20000) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp27
  if destination in (99.99.99.1) and etag in (20000) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp31
  if evpn-route-type is 1 or evpn-route-type is 2 or evpn-route-type is 3 or evpn-route-type is 4 or evpn-route-type is 5 then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp33
  if esi in evpn_esi_set1 then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp34
  if destination in (90:1:1::9/128) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp35
  if destination in evpn_prefix_set1 then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp36
  if evpn-route-type is 3 and evpn-originator in (80:1:1::3) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp37
  if evpn-gateway in (10:10::10) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp38
  if mac in evpn_mac_set1 then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp39
  if mac in (6000.6000.6002) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp41
  if evpn-gateway in (10.10.10.10, 10:10::10) then
    pass
  else
    drop
  endif
end-policy
!
route-policy samp42
  if evpn-originator in (24.162.160.1/32, 70:1:1::1/128) then
    pass
  else
    drop
  endif
end-policy
!
route-policy example
  if rd in (62300:1903) and evpn-route-type is 1 then
    drop
  elseif rd in (62300:19032) and evpn-route-type is 1 then
    drop
  else
    pass
  endif
end-policy
!
route-policy samp100
  if evpn-route-type is 4 or evpn-route-type is 5 then
    drop
  else
    pass
  endif
end-policy
!
route-policy samp101
  if evpn-route-type is 4 then
    drop
  else
    pass
  endif
end-policy
!
route-policy samp102
  if evpn-route-type is 4 then
    drop
  elseif evpn-route-type is 5 then
    drop
  else
    pass
  endif
end-policy
!
route-policy samp103
  if evpn-route-type is 2 and destination in evpn_prefix_set1 then
    drop
  else
    pass
  endif
end-policy
!
route-policy samp104
  if evpn-route-type is 1 and etag in evpn_etag_set1 then
    drop
  elseif evpn-route-type is 2 and mac in evpn_mac_set1 then
    drop
  elseif evpn-route-type is 5 and esi in evpn_esi_set1 then
    drop
  else
    pass
  endif
end-policy
!

Support for DHCPv4 and DHCPv6 Client over BVI

The Support for DHCPv4 and DHCPv6 Client over the BVI feature allows you to configure DHCPv4 and DHCPv6 client on the Bridged Virtual Interface (BVI). You can configure a BVI, and request DHCP IPv4 or IPv6 address on the BVI. This allows your customer’s device to have initial connectivity to your network without user intervention in the field. After the device is connected to your network, the customer devices can push a node-specific configuration with static IP addresses on a different BVI for customer deployment.

Configure DHCPv4 and DHCPv6 Client over BVI

Perform the following tasks to configure DHCPv4 and DHCPv6 client over BVI:

  • Configure AC interface

  • Configure L2VPN

  • Configure BVI

Configuration Example


/* Configure AC interface */
Router# configure
Router(config)# interface tenGigE 0/5/0/1/1
Router(config-if)# bundle id 1 mode on
Router(config-if)# exit
Router(config)# interface Bundle-Ether1
Router(config-if)# no shut
Router(config-if)# exit
Router(config)# interface bundle-ether 1.100 l2transport 
Router(config-l2vpn-subif)# encapsulation dot1q 100
Router(config-l2vpn-subif)# rewrite ingress tag pop 1 symmetric 
Router(config-l2vpn-subif)# commit

/* Configure L2VPN */
Router # configure
Router(config)# l2vpn
Router(config-l2vpn)# bridge group BVI
Router(config-l2vpn-bg)# bridge-domain bvi
Router(config-l2vpn-bg-bd)# interface Bundle-Ether1.100
Router(config-l2vpn-bg-bd-ac)#exit
Router(config-l2vpn-bg-bd)# routed interface BVI1
Router(config-l2vpn-bg-bd-bvi)# commit

/* Configure BVI */
Router# configure
Router(config)# interface BVI1
Router(config-if)# ipv4 address dhcp
Router(config-if)# ipv6 address dhcp
Router(config-if)# commit

Running Configuration

This section shows the DHCPv4 and DHCPv6 client over BVI running configuration.


interface TenGigE0/5/0/1/1
bundle id 1 mode on
!
interface Bundle-Ether1
!
interface Bundle-Ether1.100 l2transport
encapsulation dot1q 100
rewrite ingress tag pop 1 symmetric
!
l2vpn
bridge group BVI
  bridge-domain bvi
   interface Bundle-Ether1.100
   !
   routed interface BVI1
   !
  !
!
interface BVI1
ipv4 address dhcp
ipv6 address dhcp
!

Verification

The show output given in the following section display the details of DHCPv4 and DHCPv6 client over BVI configuration.


Router# show l2vpn bridge-domain 
Legend: pp = Partially Programmed.
Bridge group: BVI, bridge-domain: bvi, id: 0, state: up, ShgId: 0, MSTi: 0
  Aging: 300 s, MAC limit: 64000, Action: none, Notification: syslog
  Filter MAC addresses: 0
  ACs: 2 (2 up), VFIs: 0, PWs: 0 (0 up), PBBs: 0 (0 up), VNIs: 0 (0 up)
  List of ACs:
    BV1, state: up, BVI MAC addresses: 1
    BE1.100, state: up, Static MAC addresses: 0
  List of Access PWs:
  List of VFIs:
  List of Access VFIs:

Router# show dhcp ipv4 client            

    Interface name         IP Address      Binding State         Lease Time Rem
----------------------    ------------    ---------------    ----------------------
BVI1                       172.16.0.2      BOUND             3598 secs (00:59:58)
-----------------------------------------------------------------------------------
Router# show dhcp ipv6 client 

    Interface name         IPv6 Address         State              Lease Time Rem
----------------------    --------------    ---------------     --------------------
BVI1                       2000::1          BOUND               2591982
------------------------------------------------------------------------------------

Router# show dhcp ipv4 client bvi1 detail 

-----------------------------------------------------
Client Interface name         : BVI1
Client Interface handle       : 0x8804054
Client ChAddr                 : 008a.9628.ac8a
Client ID                     : BVI1.00:8a:96:28:ac:8a
Client State                  : BOUND
Client IPv4 Address (Dhcp)    : 172.16.0.2
Client IPv4 Address Mask      : 255.240.0.0
Client Lease Time Allocated   : 3600 secs (01:00:00)
Client Lease Time Remaining   : 3571 secs (00:59:31)
Client Selected Server Address: 172.16.0.1
Client Next Hop Address       : 0.0.0.0
-----------------------------------------------------

Router# show dhcp ipv4 client BVI1 statistics 

Client Interface name           : BVI1
-------------------------------------------------
     CLIENT COUNTER(s)          |        VALUE   
-------------------------------------------------
Num discovers sent              :         44
Num requests sent               :          1
Num offers received             :          1
Num acks received               :          1
-------------------------------------------------

Router# show dhcp ipv6 client 

    Interface name         IPv6 Address         State              Lease Time Rem
----------------------    --------------    ---------------     --------------------
BVI1                       2000::1          BOUND               2591685
------------------------------------------------------------------------------------

Router# show dhcp ipv6 client statistics-all 

Interface name          : BVI1
Interface handle        : 0x8804054
VRF                     : 0x60000000

     TYPE         |    TRANSMIT    |      RECEIVE   |     DROP       |
----------------------------------------------------------------------
SOLICIT          |           17  |            0  |            0  |
ADVERTISE        |            0  |            1  |            0  |
REQUEST          |            1  |            0  |            0  |
REPLY            |            0  |            2  |            0  |
CONFIRM          |            0  |            0  |            0  |
RENEW            |            1  |            0  |            0  |
REBIND           |            0  |            0  |            0  |
RELEASE          |            0  |            0  |            0  |
RECONFIG         |            0  |            0  |            0  |
INFORM           |            0  |            0  |            0  |


     TIMER         |    STARTED     |    STOPPED     |     EXPIRED    |
-----------------------------------------------------------------------
     INIT          |            1  |            0  |            1  |
     VBIND         |            0  |            0  |            0  |
     RENEW         |            2  |            1  |            0  |
     REBIND        |            2  |            1  |            0  |
     RETRANS       |           19  |            3  |           16  |
     VALID         |            2  |            1  |            0  |

Configure DHCPv6 Client Options

You can configure different DHCPv6 client options to differentiate between clients as required. Configure different DHCPv6 client options to differentiate how a DHCPv6 client communicates with a DHCPv6 server. The different DHCPv6 client options that you can configure are:

  • DUID: If the DUID DHCPv6 client option is configured on an interface, DHCPv6 client communicates with the DHCPv6 server through the link layer address.

  • Rapid Commit: If the Rapid Commit DHCPv6 client option is configured on an interface, DHCPv6 client can obtain configuration parameters from the DHCPv6 server through a rapid two-step exchange (solicit and reply) instead of the default four-step exchange (solicit, advertise, request, and reply).

  • DHCP Options: The various other DHCPv6 options that can be configured on a DHCPv6 client are:

    • Option 15: Option 15 is also known as the User Class option and it is used by a DHCPv6 client to identify the type or category of users or applications it represents.

    • Option 16: Option 16 is also known as the Vendor ID option and it is used by a DHCPv6 a client to identify the vendor that manufactured the hardware on which the client is running.

    • Option 23: Option 23 is also known as the Domain name Server (DNS) option provides a list of one or more IPv6 addresses of DNS recursive name servers to which a client's DNS resolver can send DNS queries.

    • Option 24: Option 24 is also known as the Domain List option and it specifies the domain search list that the client uses to resolve hostnames with the DNS.

  • DHCP Timers: This option is used to set different timer value for DHCP client configurations. The various DHCP timer options are:

    • Release-timeout: It is used to set retransmission timeout value for the initial release message.

    • Req-max-rt: It is used to set the maximum retransmission timeout value for the request message.

    • Req-timeout: It is used to set the initial request timeout value of the request message.

    • Sol-max-delay: It is used to set the maximum delay time of the first solicit message.

    • Sol-max-rt: It is used to set the maximum solicit retransmission time.

    • Sol-time-out: It is used to set the intial timeout value of the solicit message.

Configuration Example

Perform this task to configure DHCPv6 client options on a BVI interface.

Router# configure
Router(config)# interface BVI 10
Router(config-if)# ipv6 address dhcp-client-options
Router(config-dhcpv6-client)# duid linked-layer-address
Router(config-dhcpv6-client)# rapid-commit
Router(config-dhcpv6-client)# timers release-timeout 3
Router(config-dhcpv6-client)# timers sol-max-delay 1
Router(config-dhcpv6-client)# timers sol-time-out 1
Router(config-dhcpv6-client)# timers sol-max-rt 120
Router(config-dhcpv6-client)# timers req-max-rt 30
Router(config-dhcpv6-client)# timers req-timeout 1
Router(config-dhcpv6-client)# commit

Verification

To verify the DHCPv6 client options, use the show dhcp ipv6 client BVI10 detail command. 

Router# show dhcp ipv6 client BVI10 detail 
Wed Jun  10 16:19:21.272 IST
 
-----------------------------------------------------
Client Interface name : MgmtEth0/0/CPU0/1
Client Interface handle : 0x4040
Client MACAddr : 02f0.2b39.44be
Client State : BOUND
Client Link Local Address : fe80::f0:2bff:fe39:44be
Client IPv6 Address (Dhcp) : 600:1::12
Lease Remaining (in secs) : 74
DUID : 0003000102f02b3944be

Client Configuration
Timers
SOL_MAX_DELAY : 1 secs (00:00:01)
SOL_TIMEOUT : 1 secs (00:00:01)
SOL_MAX_RT : 120 secs (00:02:00)
REQ_TIMEOUT : 1 secs (00:00:01)
REQ_MAX_RT : 30 secs (00:00:30)
REL_TIMEOUT : 3 secs (00:00:01)

Options
RAPID-COMMIT : True
USER-CLASS : ciscoupnnp
VENDOR-CLASS : vendor
DNS-SERVERS : True
DOMAIN-LIST : True

DUID Type : DUID_LL

Server Information
Server Address : fe80::d2:a1ff:feb2:3b9f
Preference : 0
DUID : 000300010206826e2e00
Status : SUCCESS
IA-NA
Status : SUCCESS
IAID : 0x40400001
T1 : 60 secs (00:01:00)
T2 : 96 secs (00:01:36)
IA-ADDR
IA NA Address : 600:1::12
Preferred Time : 120 secs (00:02:00)
Valid Time : 120 secs (00:02:00)
Flags : 0x0

Related Topics

Associated Commands

  • show l2vpn bridge-domain

  • show dhcp ipv4 client

  • show dhcp ipv6 client

  • show dhcp ipv4 client bvi