VPLS Configuration over MPLS-TP


Note

This chapter is not applicable on the Cisco ASR 900 RSP3 Module.

This chapter describes how to configure VPLS over MPLS-TP on the Cisco ASR 903 Series Router. This chapter includes the following section:

For more information, see the MPLS Transport Profile.

VPLS over MPLS-TP

The sections below provide an overview of VPLS over MPLS-TP:

Multiprotocol Label Switching Overview

The Multiprotocol Label Switching (MPLS) Transport Profile (TP) enables you to create tunnels that provide the transport network service layer over which IP and MPLS traffic traverse. MPLS-TP tunnels enable a transition from Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH) time-division multiplexing (TDM) technologies to packet switching to support services with high bandwidth requirements, such as video.

Virtual Private LAN Services Overview

uses the provider core to join multiple attachment circuits together to simulate a virtual bridge that connects the multiple attachment circuits together. From a customer point of view, there is no topology for VPLS. All of the CE devices appear to connect to a logical bridge emulated by the provider core. See figure below.

VPLS over MPLS-TP Overview

VPLS over MPLS-TP allows you to deploy a multipoint-to-multipoint layer 2 operating environment over an MPLS-TP network for services such as Ethernet connectivity and multicast video.

Configuring VPLS over MPLS-TP

The sections below describe how to configure VPLS over MPLS-TP:

Configuration Guidelines

VPLS over MPLS-TP is only supported on Gigabit Ethernet and Ten Gigabit Ethernet interfaces.

Configuring the MPLS Label Range

You must specify a static range of MPLS labels using the mpls label range command with the static keyword.

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

mpls label range minimum-value maximum-value{ staticminimum-static-value maximum-static-value}

Example:

Router(config)# mpls label range 1001 1003 static 10000 25000

Specifies a static range of MPLS labels

Configuring the Router ID and Global ID

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

mpls tp

Example:

Router(config)# mpls tp

Enters MPLS-TP configuration mode, from which you can configure MPLS-TP parameters for the router.

Step 4

router-id node-id

Example:

Router(config-mpls-tp)# router-id 10.10.10.10

Specifies the default MPLS-TP router ID, which is used as the default source node ID for all MPLS-TP tunnels configured on the router.

Step 5

global-id num

Example:

Router(config-mpls-tp)# global-id 1

(Optional) Specifies the default global ID used for all endpoints and midpoints. This command makes the router ID globally unique in a multiprovider tunnel. Otherwise, the router ID is only locally meaningful. The global ID is an autonomous system number, which is a controlled number space by which providers can identify each other.

The router ID and global ID are also included in fault messages by routers at tunnel midpoints to help isolate the location of faults.

Configuring the Pseudowire Class

When you create the pseudowire class, you specify the parameters of the pseudowire, such as the use of the control word, and preferred path.

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

pseudowire-class class-name

Example:

Router(config)# pseudowire-class mpls-tp-class1

Creates a pseudowire class and enters pseudowire class configuration mode.

Step 4

encapsulation mpls

Example:

router(config-pw-class)# encapsulation mpls

Specifies the encapsulation type.

Step 5

control-word

Example:

Router(config-pw-class)# control-word

Enables the use of the control word.

Step 6

protocol {l2tpv2 | l2tpv3 | none}[l2tp-class-name]

Example:

Router(config-pw-class)# protocol none

Specifies the type of protocol.

Step 7

preferred-path {interface tunnel tunnel-number | peer {ip-address | host-name}} [disable-fallback]

Example:

Router(config-pw-class)# preferred-path interface tunnel-tp2

Specifies the tunnel to use as the preferred path.

Step 8

end

Example:

Router(config-pw-class)# end
Router#

Exits configuration mode.

Configuring a BFD Template

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

bfd-template single-hop template-name

Example:

Router(config)# bfd-template single-hop bfdtemplate1

Creates a BFD template and enters BFD configuration mode.

The bfd-template command allows you to create a BFD template and enters BFD configuration mode. The template can be used to specify a set of BFD interval values. You can then invoke the BFD template when you set up the MPLS–TP tunnel.

Step 4

interval microseconds {both microseconds | min-tx microseconds min-rx microseconds} [multiplier multiplier-value]

Example:

Router(config-bfd)# interval microseconds both 3300 multiplier 3

Configures the transmit and receive intervals in microseconds between BFD packets, and specifies the number of consecutive BFD control packets that must be missed from a BFD peer before BFD declares that a peer is unavailable.

Step 5

interval {both milliseconds | min-tx milliseconds min-rx milliseconds} [multiplier multiplier-value]

Example:

Router(config-bfd)# interval both 120 multiplier 3

Configures the transmit and receive intervals in milliseconds between BFD packets, and specifies the number of consecutive BFD control packets that must be missed from a BFD peer before BFD declares that a peer is unavailable.

Step 6

end

Example:

Router(config-bfd)# end
Router#

Exits configuration mode.

Configuring the MPLS-TP Tunnel

On the endpoint routers, create an MPLS TP tunnel and configure its parameters. See the interface tunnel-tp command for information on the parameters.

Procedure

  Command or Action Purpose

Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface tunnel-tp number

Example:

Router(config)# interface tunnel-tp 2

Enters tunnel interface configuration mode. Tunnel numbers from 0 to 999 are supported.

Step 4

description tunnel-description

Example:

Router(config-if)# description headend tunnel

(Optional) Specifies a tunnel description.

Step 5

tp tunnel-name name

Example:

Router(config-if)# tp tunnel-name tunnel22

Specifies the name of the MPLS-TP tunnel. The TP tunnel name is displayed in the show mpls tp tunnel command output. This command is useful for consistently identifying the tunnel at all endpoints and midpoints.

Step 6

tp source node-id [global-id num]

Example:

Router(config-if)# tp source 10.10.11.11 global-id 10

(Optional) Specifies the tunnel source and endpoint. This command is and not typically used, because the global router ID and global ID can be used to identify the tunnel source at the endpoint. All tunnels on the router generally use the same (globally specified) source information.

Step 7

tp destination node-id [[ tunnel-tpnum] global-id num]

Example:

Router(config-if)# tp destination 10.10.10.10

Specifies the destination node of the tunnel.

Step 8

bfd bfd-template

Example:

Router(config-if)# bfd template1

Specifies the BFD template.

Step 9

working-lsp

Example:

Router(config-if)# working-lsp

Specifies a working LSP, also known as the primary LSP. This LSP is used to route traffic. This command enters working LSP interface configuration mode (config-if-working).

Step 10

in-label num

Example:

Router(config-if-working)# in-label 10000

Specifies the in label.

Step 11

out-label num out-link num

Example:

Router(config-if-working)# out-label 10000 out-link 1

Specifies the out label and out link.

Step 12

exit

Example:

Router(config-if-working)# exit

Exits from working LSP interface configuration mode.

Step 13

protect-lsp

Example:

Router(config-if)# protect-lsp

Specifies a backup for a working LSP. If the working LSP fails, traffic is switched to the protect LSP until the working LSP is restored, at which time forwarding reverts back to the working LSP. This command enters protect LSP interface configuration mode (config-if-protect).

Step 14

in-label num

Example:

Router(config-if-protect)# in-label 10001

Specifies the in label.

Step 15

out-label num out-link num

Example:

Router(config-if-protect)# out-label 10001 out-link 2

Specifies the out label and out link.

Step 16

exit

Example:

Router(config-if-protect)# exit

Exits from protect LSP interface configuration mode.

Configuring MPLS-TP Links and Physical Interfaces

MPLS-TP link numbers may be assigned to physical interfaces only. Bundled interfaces and virtual interfaces are not supported for MPLS-TP link numbers.

The sections below describe how to configure physical interfaces for a VPLS over MPLS-TP link.

Configuring an Output Interface

Procedure
  Command or Action Purpose

Step 1

enable

Example:
Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configure terminal

Example:
Router# configure terminal

Enters global configuration mode.

Step 3

interface type/num

Example:
Router(config)# interface gigabitEthernet 1/0

Specifies the interface and enters interface configuration mode.

Step 4

no ip address

Example:
Router(config-if)# no ip address

Specifies that there is no IP address assigned to the interface.

Step 5

negotiation auto

Example:
Router(config-if)# negotiation auto

Enables the autonegotiation protocol to configure the speed, duplex, and automatic flow control of the Gigabit Ethernet interface.

Step 6

mpls tp link link-num {ipv4 ip-address | tx-mac mac-address}

Example:
Router(config-if)# mpls tp link 1 ipv4 10.0.0.2

Associates an MPLS-TP link number with a physical interface and next-hop node. On point-to-point interfaces or Ethernet interfaces designated as point-to-point using the medium p2p command, the next-hop can be implicit, so the mpls tp link command just associates a link number to the interface.

Multiple tunnels and LSPs can refer to the MPLS-TP link to indicate they are traversing that interface. You can move the MPLS-TP link from one interface to another without reconfiguring all the MPLS-TP tunnels and LSPs that refer to the link.

Link numbers a must be unique on the router or node.

Step 7

exit

Example:
Router(config-if)# exit

Exits interface configuration mode.

Step 8

exit

Example:
Router(config)# exit

Exits global configuration mode.

Step 9

show mpls tp link-numbers

Example:
Router# show mpls tp link-numbers

Displays the configured links.

Configuring an Access Interface

Procedure
  Command or Action Purpose

Step 1

enable

Example:
Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:
Router# configure terminal

Enters global configuration mode.

Step 3

interface type/num

Example:
Router(config)# interface gigabitethernet 1/0

Specifies the interface and enters interface configuration mode.

Step 4

no ip address

Example:
Router(config-if)# no ip address

Specifies that there is no IP address assigned to the interface.

Step 5

negotiation auto

Example:
Router(config-if)# negotiation auto

Enables the autonegotiation protocol to configure the speed, duplex, and automatic flow control of the Gigabit Ethernet interface.

Step 6

service instance id service-type

Example:
Router(config)# service instance 1 ethernet

Configures an Ethernet service instance.

Step 7

encapsulation dot1q vlan-id second-dot1q {any | vlan-id | vlan-id-vlan-id[,vlan-id-vlan-id]}

Example:
Router(config-if)# encapsulation dot1q 2

Enables IEEE 802.1Q encapsulation of traffic on a specified subinterface in a VLAN.

Step 8

bridge-domain vlan-id [access | dot1q [tag] | dot1q-tunnel] [broadcast] [ignore-bpdu-pid] [pvst-tlvCE-vlan] [increment] [lan-fcs] [split-horizon]

Example:
Router(config-if)# bridge-domain 1000

Places the interface in the same bridge domain as the VFI interface.

Step 9

exit

Example:
Router(config-if)# exit

Exits interface configuration mode.

Configuring the VFI in the PE

The virtual switch instance (VFI) specifies the VPN ID of a VPLS domain, the addresses of other PE routers in this domain, and the type of tunnel signaling and encapsulation mechanism for each peer. (This is where you create the VSI and associated VCs.) Configure a VFI as follows:


Note
Only MPLS encapsulation is supported.

Procedure

  Command or Action Purpose

Step 1

l2 vfi name manual

Example:

Router(config)# l2 vfi vfi17 manual

Enables the Layer 2 VFI manual configuration mode.

Step 2

vpn id vpn-id

Example:

Router(config-vfi)# vpn id 1000

Configures a VPN ID for a VPLS domain. The emulated VCs bound to this Layer 2 VRF use this VPN ID for signaling.

Step 3

bridge-domain vlan-id [access | dot1q [tag] | dot1q-tunnel] [broadcast] [ignore-bpdu-pid] [pvst-tlv CE-vlan] [increment] [lan-fcs] [split-horizon]

Example:

Router(config-vfi)# bridge-domain 1000

Places the VFI in the same bridge domain as the access interface.

Step 4

neighbor remote router id [vc-id-value] {encapsulation mpls}[no-split-horizon]

Example:

Router(config-vfi)# neighbor 1.5.1.1 101 encapsulation mpls

Specifies the remote peering router ID and the tunnel encapsulation type or the pseudo wire property to be used to set up the emulated VC.

Note

 
Split horizon is the default configuration to avoid broadcast packet looping and to isolate Layer 2 traffic. Use the no-split-horizon keyword to disable split horizon and to configure multiple VCs per spoke into the same VFI.

Note

 
The optional VC ID value identifies the emulated VC between a pair of peering PE routers.

Step 5

shutdown

Example:

Router(config-vfi)# shutdown

Disconnects all emulated VCs previously established under the Layer 2 VFI and prevents the establishment of new attachment circuits.

Note

 
It does not prevent the establishment of new attachment circuits configured with the Layer 2 VFI using CLI.

Configuring a Virtual Loopback Interface

This task explains how to configure a basic loopback interface.

The IP address of a loopback interface must be unique across all routers on the network. It must not be used by another interface on the router, and it must not be used by an interface on any other router on the network.

Procedure

  Command or Action Purpose

Step 1

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 2

interface loopback interface-path-id

Example:

Router#(config)# interface Loopback 3

Enters interface configuration mode and names the new loopback interface.

Step 3

ipv4 address ip-address

Example:

Router(config-if)# ipv4 address 172.18.189.38

Assigns an IP address and subnet mask to the virtual loopback interface using the ipv4 address configuration command.

Step 4

end

Example:

Router(config-if)# end
Saves configuration changes. When you issue the end command, the system prompts you to commit changes: 

Uncommitted changes found, commit them before exiting(yes/no/cancel)?
[cancel]:
  • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.
  • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.
  • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

Note

 
Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Step 5

show interfaces type interface-path-id

Example:

router# show interfaces Loopback 3

(Optional) Displays the configuration of the loopback interface.

Verifying the Configuration

You can use the following commands to verify your configuration:

  • show mpls l2transport vc —Displays information about Any Transport over MPLS (AToM) virtual circuits (VCs) and static pseudowires that have been enabled to route Layer 2 packets on the router.

  • show mpls tp —Displays information about Multiprotocol Label Switching (MPLS) transport profile (TP) tunnels.

  • show bfd summary —Displays summary information for Bidirectional Forwarding Protocol (BFD).

  • show xconnect —Displays information about xconnect attachment circuits and pseudowires.

You can use the following commands to debug your configuration:

  • debug mpls tp all —Debug for all MPLS-TP information.

  • debug mpls tp cli —Debug for MPLS-TP CLI

  • debug mpls tp error —Debug for MPLS-TP errors

  • debug mpls tp event —Debug for MPLS events

  • debug mpls tp fault-oam —Debug for Fault-OAM

  • debug mpls tp ha —Debug for High availability

  • debug mpls tp init —Debug for MPLS-TP initialization

  • debug mpls tp link-management —Debug for link management

  • debug mpls tp link-num —Debug for link number database

  • debug mpls tp lsp-db —Debug for LSP database

  • debug mpls tp lsp-ep —Debug for endpoint LSP configuration and operation

  • debug mpls tp lsp-mp —Debug for midpoint LSP configuration and operation

  • debug mpls tp mem —Debug for memory allocation and usage

  • debug mpls tp tun-db —Debug for the tunnel database

  • debug mpls tp tunnel —Debug for tunnel configuration and operation

Configuration Examples

PE Configuration


!
mpls label range 1001 4000 static 16 1000
mpls tp
 router-id 10.10.10.10
!
bfd-template single-hop testbfd
interval microseconds min-tx 50000 min-rx 50000 multiplier 3
!
! Output link
interface GigabitEthernet0/0/0
 no ip address
 negotiation auto
 mpls tp link 2 tx-mac 88f0.7768.2300
!

! Output link
interface GigabitEthernet0/2/0
 no ip address
 negotiation auto
 mpls tp link 1 tx-mac 88f0.7768.2310
!
!
interface Tunnel-tp1
ip unnumbered Loopback0
 no keepalive
 tp source 10.10.10.10 global-id 0
 tp destination 192.168.1.1 global-id 0
 bfd testbfd
 working-lsp
  out-label 100 out-link 1
  in-label 200
  lsp-number 0
 protect-lsp
  out-label 300 out-link 2
  in-label 400
  lsp-number 102
!
!
pseudowire-class myclass
 encapsulation mpls
 preferred-path interface Tunnel-tp1
!
!
!VFI definition
l2 vfi VPLS manual
 vpn id 1000
 bridge-domain 1000
 neighbor 192.168.1.1 pw-class myclass
!
!
interface Loopback0
 ip address 10.10.10.10 255.255.255.255
!
! Access interface
interface GigabitEthernet0/1/0
 no ip address
 negotiation auto
 service instance 1 ethernet
  encapsulation dot1q 2
  bridge-domain 1000
!

P Configuration (Midpoint)


!
interface loopback 0
ip address 9.9.9.9 255.255.255.255
!
mpls label range 1001 4000 static 16 1000
mpls t
router-id 9.9.9.9
!
mpls tp lsp source 10.10.10.10 tunnel-tp 1 lsp working destination 192.168.1.1 tunnel-tp 1
 forward-lsp
  in-label 100 out-label 300 out-link 1
reverse-lsp
  in-label 400 out-label 200 out-link 2
!
out-link 1 connected to 192.168.1.1
out-link 2 connected to 10.10.10.10

Feature Information for VPLS Configuration over MPLS-TP

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1. Feature Information for VPLS Configuration over MPLS-TP

Feature Name

Release

Feature Information

VPLS Configuration over MPLS-TP

IOS XE 3.5

This feature was introduced on the Cisco RSP1 Module in this release.

VPLS Configuration over MPLS-TP

IOS XE 3.13

This feature was introduced on the Cisco RSP2 Module in this release.

VPLS Configuration over MPLS-TP

IOS XE 3.16

This feature was introduced on the Cisco RSP3 Module in this release.

Feature Name

Release

Feature Information

VPLS Configuration over MPLS-TP

IOS XE 3.18SP

This feature was introduced on the Cisco NCS 4200 Series.