Cisco Nexus 3600 Switch NX-OS VXLAN Configuration Guide, Release 10.2(x)

Guidelines and Limitations for VXLAN BGP EVPN

VXLAN BGP EVPN has the following guidelines and limitations:

SVI and sub-interfaces as core links are not supported along with Layer 2 GW configurations.
In a VXLAN EVPN setup, border leaves must use unique route distinguishers, preferably using auto rd command. It is not supported to have same route distinguishers in different border leaves.
ARP suppression is only supported for a VNI if the VTEP hosts the First-Hop Gateway (Distributed Anycast Gateway) for this VNI. The VTEP and the SVI for this VLAN have to be properly configured for the distributed anycast gateway operation, for example, global anycast gateway MAC address configured and anycast gateway feature with the virtual IP address on the SVI.
The show commands with the internal keyword are not supported.
DHCP snooping (Dynamic Host Configuration Protocol snooping) is not supported on VXLAN VLANs.
SPAN for VXLAN uplink interface is not supported.
RACLs are not supported on Layer 3 uplinks for VXLAN traffic.
RACLS and PACLs are not supported for VXLAN VLANs.
QoS classification is not supported for VXLAN VLANs.
Uplink ports can be of type Layer 3 interface, sub-interface, or a Layer 3 port-channel interface. However with Layer 2 GW sub-interface uplink ports are not supported.
For EBGP, it is recommended to use a single overlay EBGP EVPN session between loopbacks.
Bind NVE to a loopback address that is separate from other loopback addresses that are required by Layer 3 protocols. A best practice is to use a dedicated loopback address for VXLAN.
VXLAN BGP EVPN does not support an NVE interface in a non-default VRF.
It is recommended to configure a single BGP session over the loopback for an overlay BGP session.
The VXLAN UDP port number is used for VXLAN encapsulation. For Cisco Nexus NX-OS, the UDP port number is 4789. It complies with IETF standards and is not configurable.
VXLAN does not support co-existence with the MPLS feature.
VXLAN with Layer 3 VPN is not supported.
VXLAN with ingress replication is not supported.
MLD snooping is not supported on VXLAN VLANs.
DHCP snooping is not supported on VXLAN VLANs.

Considerations for VXLAN BGP EVPN Deployment

A loopback address is required when using the source-interface config command. The loopback address represents the local VTEP IP.
To establish IP multicast routing in the core, IP multicast configuration, PIM configuration, and RP configuration is required.
VTEP to VTEP unicast reachability can be configured through any IGP/BGP protocol.
As a best practice when changing the IP address of a VTEP device, enter the shut command on the loopback interface used by the NVE interface and then enter the no shut command before changing the IP address.
Every tenant VRF needs a VRF overlay VLAN and SVI for VXLAN routing.

Network Considerations for VXLAN Deployments

MTU Size in the Transport Network

Due to the MAC-to-UDP encapsulation, VXLAN introduces 50-byte overhead to the original frames. Therefore, the maximum transmission unit (MTU) in the transport network needs to be increased by 50 bytes. If the overlays use a 1500-byte MTU, the transport network needs to be configured to accommodate 1550-byte packets at a minimum. Jumbo-frame support in the transport network is required if the overlay applications tend to use larger frame sizes than 1500 bytes.
ECMP and LACP Hashing Algorithms in the Transport Network

As described in a previous section, Cisco Nexus 3600 platform switches introduce a level of entropy in the source UDP port for ECMP and LACP hashing in the transport network. As a way to augment this implementation, the transport network uses an ECMP or LACP hashing algorithm that takes the UDP source port as an input for hashing, which achieves the best load-sharing results for VXLAN encapsulated traffic.
Multicast Group Scaling

The VXLAN implementation on Cisco Nexus 3600 platform switches uses multicast tunnels for broadcast, unknown unicast, and multicast traffic forwarding. Ideally, one VXLAN segment mapping to one IP multicast group is the way to provide the optimal multicast forwarding. It is possible, however, to have multiple VXLAN segments share a single IP multicast group in the core network. VXLAN can support up to 16 million logical Layer 2 segments, using the 24-bit VNID field in the header. With one-to-one mapping between VXLAN segments and IP multicast groups, an increase in the number of VXLAN segments causes a parallel increase in the required multicast address space and the amount of forwarding states on the core network devices. At some point, multicast scalability in the transport network can become a concern. In this case, mapping multiple VXLAN segments to a single multicast group can help conserve multicast control plane resources on the core devices and achieve the desired VXLAN scalability. However, this mapping comes at the cost of suboptimal multicast forwarding. Packets forwarded to the multicast group for one tenant are now sent to the VTEPs of other tenants that are sharing the same multicast group. This causes inefficient utilization of multicast data plane resources. Therefore, this solution is a trade-off between control plane scalability and data plane efficiency.

Despite the suboptimal multicast replication and forwarding, having multiple-tenant VXLAN networks to share a multicast group does not bring any implications to the Layer 2 isolation between the tenant networks. After receiving an encapsulated packet from the multicast group, a VTEP checks and validates the VNID in the VXLAN header of the packet. The VTEP discards the packet if the VNID is unknown to it. Only when the VNID matches one of the VTEP’s local VXLAN VNIDs, does it forward the packet to that VXLAN segment. Other tenant networks will not receive the packet. Thus, the segregation between VXLAN segments is not compromised.

Considerations for the Transport Network

The following are considerations for the configuration of the transport network:

On the VTEP device:
- Enable and configure IP multicast.
- Create and configure a loopback interface with a /32 IP address.
- Enable IP multicast on the loopback interface.
- Advertise the loopback interface /32 addresses through the routing protocol (static route) that runs in the transport network.
- Enable IP multicast on the uplink outgoing physical interface.
Throughout the transport network:
- Enable and configure IP multicast.

BGP EVPN Considerations for VXLAN Deployment

Enabling VXLAN

Enable VXLAN and the EVPN.

SUMMARY STEPS

feature vn-segment
feature nv overlay
nv overlay evpn

DETAILED STEPS

	Command or Action	Purpose
Step 1	feature vn-segment	Enable VLAN-based VXLAN
Step 2	feature nv overlay	Enable VXLAN
Step 3	nv overlay evpn	Enable the EVPN control plane for VXLAN.

Configuring VLAN and VXLAN VNI

SUMMARY STEPS

vlan number
vn-segment number

DETAILED STEPS

	Command or Action	Purpose
Step 1	vlan `number`	Specify VLAN.
Step 2	vn-segment `number`	Map VLAN to VXLAN VNI to configure Layer 2 VNI under VXLAN VLAN.

Configuring VRF for VXLAN Routing

Configure the tenant VRF.

SUMMARY STEPS

vrf context vxlan
vni number
rd auto
address-family ipv4 unicast
route-target both auto
route-target both auto evpn
address-family ipv6 unicast
route-target both auto
route-target both auto evpn

DETAILED STEPS

Command or Action

Purpose

Step 1

vrf context vxlan

Configure the VRF.

Step 2

vni number

Specify VNI.

Step 3

rd auto

Specify VRF RD (route distinguisher).

Step 4

address-family ipv4 unicast

Configure address family for IPv4.

Step 5

route-target both auto

Note

Specifying the auto option is applicable only for IBGP.

Manually configured route targets are required for EBGP.

Step 6

route-target both auto evpn

Note

Specifying the auto option is applicable only for IBGP.

Manually configured route targets are required for EBGP.

Step 7

address-family ipv6 unicast

Configure address family for IPv6.

Step 8

route-target both auto

Note

Specifying the auto option is applicable only for IBGP.

Manually configured route targets are required for EBGP.

Step 9

route-target both auto evpn

Note

Specifying the auto option is applicable only for IBGP.

Manually configured route targets are required for EBGP.

Configuring SVI for Hosts for VXLAN Routing

Configure the SVI for hosts.

SUMMARY STEPS

vlan number
interface vlan-number
vrf member vxlan-number
ip address address

DETAILED STEPS

	Command or Action	Purpose
Step 1	vlan `number`	Specify VLAN
Step 2	interface `vlan-number`	Specify VLAN interface.
Step 3	vrf member `vxlan-number`	Configure SVI for host.
Step 4	ip address `address`	Specify IP address.

Configuring VRF Overlay VLAN for VXLAN Routing

SUMMARY STEPS

vlan number
vn-segment number

DETAILED STEPS

	Command or Action	Purpose
Step 1	vlan `number`	Specify VLAN.
Step 2	vn-segment `number`	Specify vn-segment.

Configuring VNI Under VRF for VXLAN Routing

Configures a Layer 3 VNI under a VRF overlay VLAN. (A VRF overlay VLAN is a VLAN that is not associated with any server facing ports. All VXLAN VNIs that are mapped to a VRF, need to have their own internal VLANs allocated to it.)

SUMMARY STEPS

vrf context vxlan
vni number

DETAILED STEPS

	Command or Action	Purpose
Step 1	vrf context `vxlan`	Create a VXLAN Tenant VRF
Step 2	vni `number`	Configure Layer 3 VNI under VRF.

Configuring Anycast Gateway for VXLAN Routing

SUMMARY STEPS

fabric forwarding anycast-gateway-mac address
fabric forwarding mode anycast-gateway

DETAILED STEPS

Command or Action

Purpose

Step 1

fabric forwarding anycast-gateway-mac address

Configure distributed gateway virtual MAC address

Note

One virtual MAC per VTEP

Note

All VTEPs should have the same virtual MAC address

Step 2

fabric forwarding mode anycast-gateway

Associate SVI with anycast gateway under VLAN configuration mode.

Configuring the NVE Interface and VNIs

SUMMARY STEPS

interface nve-interface
host-reachability protocol bgp
member vni vni associate-vrf
member vni vni
mcast-group address

DETAILED STEPS

Command or Action

Purpose

Step 1

interface nve-interface

Configure the NVE interface.

Step 2

host-reachability protocol bgp

This defines BGP as the mechanism for host reachability advertisement

Step 3

member vni vni associate-vrf

Add Layer-3 VNIs, one per tenant VRF, to the overlay.

Note

Required for VXLAN routing only.

Step 4

member vni vni

Add Layer 2 VNIs to the tunnel interface.

switch# member vni 900001 associate-vrf

Step 5

mcast-group address

Configure the mcast group on a per-VNI basis

Configuring BGP on the VTEP

SUMMARY STEPS

router bgp number
router-id address
neighbor address remote-as number
address-family ipv4 unicast
address-family l2vpn evpn
(Optional) Allowas-in
send-community extended
vrf vrf-name
address-family ipv4 unicast
advertise l2vpn evpn
address-family ipv6 unicast
advertise l2vpn evpn

DETAILED STEPS

Command or Action

Purpose

Step 1

router bgp number

Configure BGP.

Step 2

router-id address

Specify router address.

Step 3

neighbor address remote-as number

Define MP-BGP neighbors. Under each neighbor define l2vpn evpn.

Step 4

address-family ipv4 unicast

Configure address family for IPv4.

Step 5

address-family l2vpn evpn

Configure address family Layer 2 VPN EVPN under the BGP neighbor.

Note

Address-family ipv4 evpn for vxlan host-based routing

Step 6

(Optional) Allowas-in

(Optional)

Allows duplicate AS numbers in the AS path. Configure this parameter on the leaf for eBGP when all leafs are using the same AS, but the spines have a different AS than leafs.

Step 7

send-community extended

Configures community for BGP neighbors.

Step 8

vrf vrf-name

Specify VRF.

Step 9

address-family ipv4 unicast

Configure address family for IPv4.

Step 10

advertise l2vpn evpn

Enable advertising EVPN routes.

Step 11

address-family ipv6 unicast

Configure address family for IPv6.

Step 12

advertise l2vpn evpn

Enable advertising EVPN routes.

Configuring RD and Route Targets for VXLAN Bridging

SUMMARY STEPS

evpn
vni number l2
rd auto
route-target import auto
route-target export auto

DETAILED STEPS

Command or Action

Purpose

Step 1

evpn

Configure VRF.

Step 2

vni number l2

Note

Only Layer 2 VNIs need to be specified.

Step 3

rd auto

Define VRF RD (route distinguisher) to configure VRF context.

Step 4

route-target import auto

Define VRF Route Target and import policies.

Step 5

route-target export auto

Define VRF Route Target and export policies.

Configuring BGP for EVPN on the Spine

SUMMARY STEPS

route-map permitall permit 10
set ip next-hop unchanged
router bgp autonomous system number
address-family l2vpn evpn
retain route-target all
neighbor address remote-as number
address-family l2vpn evpn
disable-peer-as-check
send-community extended
route-map permitall out

DETAILED STEPS

Command or Action

Purpose

Step 1

route-map permitall permit 10

Configure route-map.

Note

The route-map keeps the next-hop unchanged for EVPN routes.

Required for eBGP.
Optional for iBGP.

Step 2

set ip next-hop unchanged

Set next-hop address.

Note

The route-map keeps the next-hop unchanged for EVPN routes.

Required for eBGP.
Optional for iBGP.

Step 3

router bgp autonomous system number

Specify BGP.

Step 4

address-family l2vpn evpn

Configure address family Layer 2 VPN EVPN under the BGP neighbor.

Step 5

retain route-target all

Configure retain route-target all under address-family Layer 2 VPN EVPN [global].

Note

Required for eBGP. Allows the spine to retain and advertise all EVPN routes when there are no local VNI configured with matching import route targets.

Step 6

neighbor address remote-as number

Define neighbor.

Step 7

address-family l2vpn evpn

Configure address family Layer 2 VPN EVPN under the BGP neighbor.

Step 8

disable-peer-as-check

Disables checking the peer AS number during route advertisement. Configure this parameter on the spine for eBGP when all leafs are using the same AS but the spines have a different AS than leafs.

Note

Required for eBGP.

Step 9

send-community extended

Configures community for BGP neighbors.

Step 10

route-map permitall out

Applies route-map to keep the next-hop unchanged.

Note

Required for eBGP.

Disabling VXLANs

SUMMARY STEPS

configure terminal
no nv overlay evpn
no feature vn-segment-vlan-based
no feature nv overlay
(Optional) copy running-config startup-config

DETAILED STEPS

	Command or Action	Purpose
Step 1	configure terminal	Enters configuration mode.
Step 2	no nv overlay evpn	Disables EVPN control plane.
Step 3	no feature vn-segment-vlan-based	Disables the global mode for all VXLAN bridge domains
Step 4	no feature nv overlay	Disables the VXLAN feature.
Step 5	(Optional) copy running-config startup-config	(Optional) Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration.

Duplicate Detection for IP and MAC Addresses

Cisco NX-OS supports duplicate detection for IP and MAC addresses. This enables the detection of duplicate IP or MAC addresses based on the number of moves in a given time-interval (seconds).

The default is 5 moves in 180 seconds. (Default number of moves is 5 moves. Default time-interval is 180 seconds.)

For IP addresses:
- After the 5th move within 180 seconds, the switch starts a 30 second lock (hold down timer) before checking to see if the duplication still exists (an effort to prevent an increment of the sequence bit). This 30 second lock can occur 5 times (this means 5 moves in 180 seconds for 5 times) before the switch permanently locks or freezes the duplicate entry.
For MAC addresses:
- After the 5th move within 180 seconds, the switch starts a 30 second lock (hold down timer) before checking to see if the duplication still exists (an effort to prevent an increment of the sequence bit). This 30 second lock can occur 3 times (this means 5 moves in 180 seconds for 3 times) before the switch permanently locks or freezes the duplicate entry.

The following are example commands to help the configuration of the number of VM moves in a specific time interval (seconds) for duplicate IP-detection:


Command	Description
`switch(config)# fabric forwarding ? anycast-gateway-mac dup-host-ip-addr-detection`	Available sub-commands: Anycast gateway MAC of the switch. To detect duplicate host addresses in n seconds.
`switch(config)# fabric forwarding dup-host-ip-addr-detection ? <1-1000>`	The number of host moves allowed in n seconds. The range is 1 to 1000 moves; default is 5 moves.
`switch(config)# fabric forwarding dup-host-ip-addr-detection 100 ? <2-36000>`	The duplicate detection timeout in seconds for the number of host moves. The range is 2 to 36000 seconds; default is 180 seconds.
`switch(config)# fabric forwarding dup-host-ip-addr-detection 100 10`	Detects duplicate host addresses (limited to 100 moves) in a period of 10 seconds.

The following are example commands to help the configuration of the number of VM moves in a specific time interval (seconds) for duplicate MAC-detection:


Command	Description
`switch(config)# l2rib dup-host-mac-detection ? <1-1000> default`	Available sub-commands for L2RIB: The number of host moves allowed in n seconds. The range is 1 to 1000 moves. Default setting (5 moves in 180 in seconds).
`switch(config)# l2rib dup-host-mac-detection 100 ? <2-36000>`	The duplicate detection timeout in seconds for the number of host moves. The range is 2 to 36000 seconds; default is 180 seconds.
`switch(config)# l2rib dup-host-mac-detection 100 10`	Detects duplicate host addresses (limited to 100 moves) in a period of 10 seconds.

Verifying the VXLAN Configuration

To display the VXLAN configuration information, enter one of the following commands:


Command	Purpose
show tech-support vxlan	Displays related VXLAN tech-support information.
show logging level nve	Displays logging level.
show tech-support nve	Displays related NVE tech-support information.
show tech-support vxlan-evpn	Displays related VXLAN EVPN tech-support information.
show tech-support vxlan platform	Displays VXLAN platform related tech-support information.
show run interface nve	Displays NVE overlay interface configuration.
show nve interface	Displays NVE overlay interface status.
show nve peers	Displays NVE peer status.
show nve peers `peer_IP_address` interface `interface_ID` counters	Displays per NVE peer statistics.
clear nve peers `peer_IP_address` interface `interface_ID` counters	Clears per NVE peer statistics.
show nve vni	Displays VXLAN VNI status.
show nve vxlan-params	Displays VXLAN parameters, such as VXLAN destination or UDP port.

Example of VXLAN BGP EVPN (EBGP)

An example of a VXLAN BGP EVPN (EBGP):

Figure 1. VXLAN BGP EVPN Topology (EBGP)

EBGP between Spine and Leaf

Spine (9504-A)

Enable the EVPN control plane
```
nv overlay evpn
```
Enable the relevant protocols
```
feature bgp
feature pim
```

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 10.1.1.1/32
  ip pim sparse-mode

Configure Loopback for Anycast RP


interface loopback1
  ip address 100.1.1.1/32
  ip pim sparse-mode

Configure Anycast RP


ip pim rp-address 100.1.1.1 group-list 225.0.0.0/8
ip pim rp-candidate loopback1 group-list 225.0.0.0/8
ip pim log-neighbor-changes
ip pim ssm range 232.0.0.0/8
ip pim anycast-rp 100.1.1.1 10.1.1.1
ip pim anycast-rp 100.1.1.1 20.1.1.1

Configure route-map used by EBGP for Spine


route-map permitall permit 10
  set ip next-hop unchanged

Enable OSPF for underlay routing


router ospf 1
  log-adjacency-changes detail

Configure interfaces for Spine-leaf interconnect


interface Ethernet4/2
  ip address 192.168.1.42/24
  ip pim sparse-mode
  no shutdown

interface Ethernet4/3
  ip address 192.168.2.43/24
  ip pim sparse-mode
  no shutdown

Configure the BGP overlay for the EVPN address family.


router bgp 100
  router-id 10.1.1.1
  address-family l2vpn evpn                                    
    nexthop route-map permitall
    retain route-target all        
  neighbor 30.1.1.1 remote-as 200
    update-source loopback0
    ebgp-multihop 3
    address-family l2vpn evpn
      disable-peer-as-check                     
      send-community extended 
      route-map permitall out
  neighbor 40.1.1.1 remote-as 200
    update-source loopback0
    ebgp-multihop 3
    address-family l2vpn evpn
      disable-peer-as-check
      send-community extended
      route-map permitall out

Configure the BGP underlay.


neighbor 192.168.1.43 remote-as 200
    address-family ipv4 unicast
      allowas-in
      disable-peer-as-check

Spine (9504-B)

Enable the EVPN control plane and the relevant protocols


feature telnet
feature nxapi
feature bash-shell
feature scp-server
nv overlay evpn
feature bgp
feature pim
feature lldp

Configure Anycast RP


ip pim rp-address 100.1.1.1 group-list 225.0.0.0/8
ip pim rp-candidate loopback1 group-list 225.0.0.0/8
ip pim log-neighbor-changes
ip pim ssm range 232.0.0.0/8
ip pim anycast-rp 100.1.1.1 10.1.1.1
ip pim anycast-rp 100.1.1.1 20.1.1.1
vlan 1-1002
route-map permitall permit 10
  set ip next-hop unchanged

Configure interfaces for Spine-leaf interconnect


interface Ethernet4/2
  ip address 192.168.4.42/24
  no shutdown
 
interface Ethernet4/3
  ip address 192.168.3.43/24
  no shutdown

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 20.1.1.1/32

Configure the BGP overlay for the EVPN address family.


router bgp 100
  router-id 20.1.1.1
  address-family l2vpn evpn
    retain route-target all
  neighbor 30.1.1.1 remote-as 200
    update-source loopback0
    ebgp-multihop 3
    address-family l2vpn evpn
      disable-peer-as-check
      send-community extended
      route-map permitall out
  neighbor 40.1.1.1 remote-as 200
    ebgp-multihop 3
    address-family l2vpn evpn
      disable-peer-as-check
      send-community extended
      route-map permitall out

Configure the BGP underlay.


neighbor 192.168.1.43 remote-as 200
    address-family ipv4 unicast
      allowas-in
      disable-peer-as-check

Leaf (9396-A)

Enable the EVPN control plane
```
nv overlay evpn
```

Enable the relevant protocols


feature bgp
feature interface-vlan
feature dhcp

Enable VxLAN with distributed anycast-gateway using BGP EVPN


feature vn-segment-vlan-based
feature nv overlay
fabric forwarding anycast-gateway-mac 0000.2222.3333

Enable PIM RP


ip pim rp-address 100.1.1.1 group-list 225.0.0.0/8

Configure Loopback for BGP


interface loopback0
  ip address 30.1.1.1/32

Configure Loopback for local VTEP IP


interface loopback1
  ip address 50.1.1.1/32

Configure interfaces for Spine-leaf interconnect


interface Ethernet2/2
  no switchport
  load-interval counter 1 5
  ip address 192.168.1.22/24
  no shutdown
 
interface Ethernet2/3
  no switchport
  load-interval counter 1 5
  ip address 192.168.3.23/24
  no shutdown

Create the VRF overlay VLAN and configure the vn-segment.
```
vlan 101
  vn-segment 900001
```

Configure VRF overlay VLAN/SVI for the VRF


interface Vlan101
  no shutdown
  vrf member vxlan-900001

Create VLAN and provide mapping to VXLAN


vlan 1001
  vn-segment 2001001
vlan 1002
  vn-segment 2001002

Create VRF and configure VNI


vrf context vxlan-900001
  vni 900001


  rd auto
  address-family ipv4 unicast
    route-target import 65535:101 evpn
    route-target export 65535:101 evpn
    route-target import 65535:101
    route-target export 65535:101
  address-family ipv6 unicast
    route-target import 65535:101 evpn
    route-target export 65535:101 evpn
    route-target import 65535:101 
    route-target export 65535:101

Create server facing SVI and enable distributed anycast-gateway


interface Vlan1001
  no shutdown
  vrf member vxlan-900001
  ip address 4.1.1.1/24           
  ipv6 address 4:1:0:1::1/64
  fabric forwarding mode anycast-gateway
  ip dhcp relay address 192.168.100.1 use-vrf default

interface Vlan1002
  no shutdown
  vrf member vxlan-900001
  ip address 4.2.2.1/24           
  ipv6 address 4:2:0:1::1/64
  fabric forwarding mode anycast-gateway

Create the network virtualization endpoint (NVE) interface


interface nve1
  no shutdown
  source-interface loopback1
  host-reachability protocol bgp             
  member vni 10000 associate-vrf
  mcast-group 224.1.1.1
  member vni 10001 associate-vrf
  mcast-group 224.1.1.1
  member vni20000
  suppress-arp
  mcast-group 225.1.1.1
  member vni 20001
  suppress-arp
  mcast-group 225.1.1.1

Configure interfaces for hosts/servers.


interface Ethernet1/47
  switchport access vlan 1002
interface Ethernet1/48
  switchport access vlan 1001

Configure BGP


router bgp 200
router-id 30.1.1.1
  neighbor 10.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in                  
      send-community extended     
    address-family l2vpn evpn     
      allowas-in
      send-community extended
  neighbor 20.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in
      send-community extended
    address-family l2vpn evpn
      allowas-in
      send-community extended
  vrf vxlan-900001                                                                         
      advertise l2vpn evpn

evpn                                         
  vni 2001001 l2
  vni 2001002 l2

rd auto
route-target import auto
route-target export auto


router bgp 200
router-id 30.1.1.1
  neighbor 10.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in                  
      send-community extended     
    address-family l2vpn evpn     
      allowas-in
      send-community extended
  neighbor 20.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in
      send-community extended
    address-family l2vpn evpn
      allowas-in
      send-community extended
  vrf vxlan-900001   
advertise l2vpn evpn

evpn
  vni 2001001 l2
  vni 2001002 l2

Leaf (9396-B)

Enable the EVPN control plane functionality and the relevant protocols


feature telnet
feature nxapi
feature bash-shell
feature scp-server
nv overlay evpn
feature bgp
feature pim
feature interface-vlan
feature vn-segment-vlan-based
feature lldp
feature nv overlay

Enable VxLAN with distributed anycast-gateway using BGP EVPN
```
fabric forwarding anycast-gateway-mac 0000.2222.3333
```
Create the VRF overlay VLAN and configure the vn-segment
```
vlan 1-1002
vlan 101
  vn-segment 900001
```

Create VLAN and provide mapping to VXLAN


vlan 1001
  vn-segment 2001001
vlan 1002
  vn-segment 2001002

Create VRF and configure VNI


vrf context vxlan-900001
  vni 900001


  rd auto
  address-family ipv4 unicast
    route-target import 65535:101 evpn
    route-target export 65535:101 evpn
    route-target import 65535:101 
    route-target export 65535:101 
  address-family ipv6 unicast
    route-target import 65535:101 evpn
    route-target export 65535:101 evpn
    route-target import 65535:101 evpn
    route-target export 65535:101 evpn

Configure internal control VLAN/SVI for the VRF


interface Vlan1
 
interface Vlan101
  no shutdown
  vrf member vxlan-900001

Create server facing SVI and enable distributed anycast-gateway


interface Vlan1001
  no shutdown
  vrf member vxlan-900001
  ip address 4.1.1.1/24
  ipv6 address 4:1:0:1::1/64
  fabric forwarding mode anycast-gateway
 
interface Vlan1002
  no shutdown
  vrf member vxlan-900001
  ip address 4.2.2.1/24
  ipv6 address 4:2:0:1::1/64
  fabric forwarding mode anycast-gateway

Create the network virtualization endpoint (NVE) interface


interface nve1
  no shutdown
  source-interface loopback1
  host-reachability protocol bgp             
  member vni 10000 associate-vrf
  mcast-group 224.1.1.1
  member vni 10001 associate-vrf
  mcast-group 224.1.1.1
  member vni20000
  suppress-arp
  mcast-group 225.1.1.1
  member vni 20001
  suppress-arp
  mcast-group 225.1.1.1

Configure interfaces for hosts/servers


interface Ethernet1/47
  switchport access vlan 1002
 
interface Ethernet1/48
  switchport access vlan 1001

Configure interfaces for Spine-leaf interconnect


interface Ethernet2/1
 
interface Ethernet2/2
  no switchport
  load-interval counter 1 5
  ip address 192.168.4.22/24
  ip pim sparse-mode
  no shutdown
 
interface Ethernet2/3
  no switchport
  load-interval counter 1 5
  ip address 192.168.2.23/24
  ip pim sparse-mode
  no shutdown

Configure Loopback for BGP


interface loopback0
  ip address 40.1.1.1/32

Configure Loopback for local VTEP IP


interface loopback1
  ip address 51.1.1.1/32
  ip pim sparse-mode

Configure BGP


router bgp 200
router-id 40.1.1.1
  neighbor 10.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in
      send-community extended
    address-family l2vpn evpn
      allowas-in
      send-community extended
  neighbor 20.1.1.1 remote-as 100
    update-source loopback0
    ebgp-multihop 3
      allowas-in
      send-community extended
    address-family l2vpn evpn
      allowas-in
      send-community extended
  vrf vxlan-900001
      advertise l2vpn evpn

Example of VXLAN BGP EVPN (IBGP)

An example of a VXLAN BGP EVPN (IBGP):

Figure 2. VXLAN BGP EVPN Topology (IBGP)

IBGP between Spine and Leaf

Spine (9504-A)

Enable the EVPN control plane
```
nv overlay evpn
```
Enable the relevant protocols
```
feature ospf
feature bgp
```

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 10.1.1.1/32
  ip router ospf 1 area 0.0.0.0

Enable OSPF for underlay routing
```
router ospf 1
```

Configure interfaces for Spine-leaf interconnect


interface Ethernet4/2
  ip address 192.168.1.42/24
  ip router ospf 1 area 0.0.0.0
  no shutdown
 
interface Ethernet4/3
  ip address 192.168.2.43/24
  ip router ospf 1 area 0.0.0.0
  no shutdown

Configure BGP


router bgp 65535
router-id 10.1.1.1
  neighbor 30.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
      route-reflector-client
  neighbor 40.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
      route-reflector-client

Spine (9504-B)

Enable the EVPN control plane and the relevant protocols


feature telnet
feature nxapi
feature bash-shell
feature scp-server
nv overlay evpn
feature ospf
feature bgp
feature lldp

Configure interfaces for Spine-leaf interconnect


interface Ethernet4/2
  ip address 192.168.4.42/24
  ip router ospf 1 area 0.0.0.0
  no shutdown
 
interface Ethernet4/3
  ip address 192.168.3.43/24
  ip router ospf 1 area 0.0.0.0
  no shutdown

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 20.1.1.1/32
  ip router ospf 1 area 0.0.0.0

Configure Loopback for Anycast RP


interface loopback1
  ip address 100.1.1.1/32
  ip router ospf 1 area 0.0.0.0

Enable OSPF for underlay routing
```
router ospf 1
```

Configure BGP


router bgp 65535
router-id 20.1.1.1
  neighbor 30.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
      route-reflector-client
  neighbor 40.1.1.1 remote-as 65535
    update-source loopback0
     address-family l2vpn evpn
      send-community both
      route-reflector-client

Leaf (9396-A)

Enable the EVPN control plane
```
nv overlay evpn
```

Enable the relevant protocols


feature ospf
feature bgp
feature interface-vlan

Enabling OSPF for underlay routing
```
router ospf 1
```

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 30.1.1.1/32
  ip router ospf 1 area 0.0.0.0

Configure interfaces for Spine-leaf interconnect


interface Ethernet2/2
  no switchport
  ip address 192.168.1.22/24
  ip router ospf 1 area 0.0.0.0
  no shutdown
 
interface Ethernet2/3
  no switchport
  ip address 192.168.3.23/24
  ip router ospf 1 area 0.0.0.0
  no shutdown

Create overlay VRF VLAN and configure vn-segment
```
vlan 101
  vn-segment 900001
```

Configure VRF overlay VLAN/SVI for the VRF


interface Vlan101
  no shutdown
  vrf member vxlan-900001

Create VLAN and provide mapping to VXLAN


vlan 1001
  vn-segment 2001001
vlan 1002
  vn-segment 2001002

Create VRF and configure VNI

vrf context vxlan-900001
  vni 900001

rd auto
  address-family ipv4 unicast
    route-target both auto
    route-target both auto evpn
  address-family ipv6 unicast
    route-target both auto
    route-target both auto evpn

Create server facing SVI and enable distributed anycast-gateway


interface Vlan1001
  no shutdown
  vrf member vxlan-900001
  ip address 4.1.1.1/24
  ipv6 address 4:1:0:1::1/64
  fabric forwarding mode anycast-gateway
 
interface Vlan1002
  no shutdown
  vrf member vxlan-900001
  ip address 4.2.2.1/24
  ipv6 address 4:2:0:1::1/64
  fabric forwarding mode anycast-gateway

Create the network virtualization endpoint (NVE) interface


interface nve1
  no shutdown
  source-interface loopback0
  host-reachability protocol bgp
  member vni 900001 associate-vrf
  member vni 2001001
    suppress-arp
    mcast-group 225.4.0.1
  member vni 2001002
    suppress-arp
    mcast-group 225.4.0.1

Configure BGP


router bgp 65535
router-id 30.1.1.1
  neighbor 10.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
  neighbor 20.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
  vrf vxlan-900001
    address-family ipv4 unicast
      advertise l2vpn evpn

evpn                                         
  vni 2001001 l2
  vni 2001002 l2

rd auto
    route-target import auto
    route-target export auto

Leaf (9396-B)

Enable the EVPN control plane functionality and the relevant protocols


feature telnet
feature nxapi
feature bash-shell
feature scp-server
nv overlay evpn
feature ospf
feature bgp
feature interface-vlan
feature vn-segment-vlan-based
feature lldp
feature nv overlay

Enable VxLAN with distributed anycast-gateway using BGP EVPN
```
fabric forwarding anycast-gateway-mac 0000.2222.3333
```
Create overlay VRF VLAN and configure vn-segment
```
vlan 1-1002
vlan 101
  vn-segment 900001
```

Create VLAN and provide mapping to VXLAN


vlan 1001
  vn-segment 2001001
vlan 1002
  vn-segment 2001002

Create VRF and configure VNI


vrf context vxlan-900001
  vni 900001

rd auto
  address-family ipv4 unicast
    route-target both auto
    route-target both auto evpn
  address-family ipv6 unicast
    route-target both auto
    route-target both auto evpn

Configure internal control VLAN/SVI for the VRF


interface Vlan101
  no shutdown
  vrf member vxlan-900001

Create server facing SVI and enable distributed anycast-gateway


interface Vlan1001
  no shutdown
  vrf member vxlan-900001
  ip address 4.1.1.1/24
  ipv6 address 4:1:0:1::1/64
  fabric forwarding mode anycast-gateway
 
interface Vlan1002
  no shutdown
  vrf member vxlan-900001
  ip address 4.2.2.1/24
  ipv6 address 4:2:0:1::1/64
  fabric forwarding mode anycast-gateway

Create the network virtualization endpoint (NVE) interface


interface nve1
  no shutdown
  source-interface loopback0
  host-reachability protocol bgp
  member vni 900001 associate-vrf
  member vni 2001001
    suppress-arp
    mcast-group 225.4.0.1
  member vni 2001002
    suppress-arp
    mcast-group 225.4.0.1

Configure interfaces for hosts/servers


interface Ethernet1/47
  switchport access vlan 1002
 
interface Ethernet1/48
  switchport access vlan 1001

Configure interfaces for Spine-leaf interconnect


interface Ethernet2/1
 
interface Ethernet2/2
  no switchport
  ip address 192.168.4.22/24
  ip router ospf 1 area 0.0.0.0
  no shutdown
 
interface Ethernet2/3
  no switchport
  ip address 192.168.2.23/24
  ip router ospf 1 area 0.0.0.0
  no shutdown

Configure Loopback for local VTEP IP, and BGP


interface loopback0
  ip address 40.1.1.1/32
  ip router ospf 1 area 0.0.0.0

Enabling OSPF for underlay routing
```
router ospf 1
```

Configure BGP


router bgp 65535
router-id 40.1.1.1
  neighbor 10.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
  neighbor 20.1.1.1 remote-as 65535
    update-source loopback0
    address-family l2vpn evpn
      send-community both
  vrf vxlan-900001
    address-family ipv4 unicast
      advertise l2vpn evpn
evpn
  vni 2001001 l2
    rd auto
    route-target import auto
    route-target export auto
  vni 2001002 l2
    rd auto
    route-target import auto
    route-target export auto

evpn
  vni 2001001 l2
    rd auto
    route-target import auto
    route-target export auto
  vni 2001002 l2
    rd auto
    route-target import auto
    route-target export auto

Example Show Commands

show nve peers


9396-B# show nve peers
Interface Peer-IP          Peer-State       
--------- ---------------  ---------- 
nve1      30.1.1.1         Up

show nve vni


9396-B# show nve vni
Codes: CP - Control Plane        DP - Data Plane         
       UC - Unconfigured         SA - Suppress ARP
      
Interface VNI      Multicast-group   State Mode Type [BD/VRF]      Flags
--------- -------- ----------------- ----- ---- ------------------ -----
nve1      900001   n/a               Up    CP   L3 [vxlan-900001]      
nve1      2001001  225.4.0.1         Up    CP   L2 [1001]          SA  
nve1      2001002  225.4.0.1         Up    CP   L2 [1002]          SA

show vxlan interface


9396-B# show vxlan interface
Interface       Vlan    VPL Ifindex     LTL             HW VP
=========       ====    ===========     ===             =====
Eth1/47         1002    0x4c07d22e      0x10000         5697
Eth1/48         1001    0x4c07d02f      0x10001         5698

show bgp l2vpn evpn summary


leaf3# show bgp l2vpn evpn summary
BGP summary information for VRF default, address family L2VPN EVPN
BGP router identifier 40.0.0.4, local AS number 10
BGP table version is 60, L2VPN EVPN config peers 1, capable peers 1
21 network entries and 21 paths using 2088 bytes of memory
BGP attribute entries [8/1152], BGP AS path entries [0/0]
BGP community entries [0/0], BGP clusterlist entries [1/4]

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
State/PfxRcd    
40.0.0.1        4    10    8570    8565       60    0    0    5d22h 6

show bgp l2vpn evpn


leaf3# show bgp l2vpn evpn
BGP routing table information for VRF default, address family L2VPN EVPN
BGP table version is 60, local router ID is 40.0.0.4
Status: s-suppressed, x-deleted, S-stale, d-dampened, h-history, *-valid,
>-best
Path type: i-internal, e-external, c-confed, l-local, a-aggregate, r-redist,
I-injected
Origin codes: i - IGP, e - EGP, ? - incomplete, | - multipath, & - backup

   Network            Next Hop            Metric     LocPrf     Weight Path
Route Distinguisher: 40.0.0.2:32868
*>i[2]:[0]:[10001]:[48]:[0000.8816.b645]:[0]:[0.0.0.0]/216
                      40.0.0.2                          100          0 i
*>i[2]:[0]:[10001]:[48]:[0011.0000.0034]:[0]:[0.0.0.0]/216
                      40.0.0.2                          100          0 i

show l2route evpn mac all


leaf3# show l2route evpn mac all
Topology    Mac Address    Prod   Next Hop (s)
----------- -------------- ------ ---------------
101         0000.8816.b645 BGP    40.0.0.2
101         0001.0000.0033 Local  Ifindex 4362086
101         0001.0000.0035 Local  Ifindex 4362086
101         0011.0000.0034 BGP    40.0.0.2

show l2route evpn mac-ip all


leaf3# show l2route evpn mac-ip all
Topology ID Mac Address    Prod Host IP                 Next Hop (s)
----------- -------------- ---- ------------------------------------------------------
101         0011.0000.0034 BGP  5.1.3.2                      40.0.0.2
102         0011.0000.0034 BGP  5.1.3.2                      40.0.0.2

Bias-Free Language

Results

Chapter: Configuring VXLAN BGP EVPN

Configuring VXLAN BGP EVPN

Guidelines and Limitations for VXLAN BGP EVPN

Considerations for VXLAN BGP EVPN Deployment

Network Considerations for VXLAN Deployments

Considerations for the Transport Network

BGP EVPN Considerations for VXLAN Deployment

Enabling VXLAN

SUMMARY STEPS

DETAILED STEPS

Configuring VLAN and VXLAN VNI

SUMMARY STEPS

DETAILED STEPS

Configuring VRF for VXLAN Routing

SUMMARY STEPS

DETAILED STEPS

Configuring SVI for Hosts for VXLAN Routing

SUMMARY STEPS

DETAILED STEPS

Configuring VRF Overlay VLAN for VXLAN Routing

SUMMARY STEPS

DETAILED STEPS

Configuring VNI Under VRF for VXLAN Routing

SUMMARY STEPS

DETAILED STEPS

Configuring Anycast Gateway for VXLAN Routing

SUMMARY STEPS

DETAILED STEPS

Configuring the NVE Interface and VNIs

SUMMARY STEPS

DETAILED STEPS

Configuring BGP on the VTEP

SUMMARY STEPS

DETAILED STEPS

Configuring RD and Route Targets for VXLAN Bridging

SUMMARY STEPS

DETAILED STEPS

Configuring BGP for EVPN on the Spine

SUMMARY STEPS

DETAILED STEPS

Disabling VXLANs

SUMMARY STEPS

DETAILED STEPS

Duplicate Detection for IP and MAC Addresses

Verifying the VXLAN Configuration

Example of VXLAN BGP EVPN (EBGP)

Example of VXLAN BGP EVPN (IBGP)

Example Show Commands

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