Configuring Seamless Integration of EVPN with L3VPN (MPLS LDP)

This chapter contains the following sections:

Information About Configuring Seamless Integration of EVPN with L3VPN (MPLS LDP)

Data center deployments have adopted VXLAN EVPN for its benefits like EVPN control-plane learning, multitenancy, seamless mobility, redundancy, and easier POD additions. Similarly, the Core is either an LDP-based MPLS L3VPN network or transitioning from traditional an MPLS L3VPN LDP-based underlay to a more sophisticated solution like segment routing (SR). Segment routing is adopted for its benefits like unified IGP and MPLS control planes, simpler traffic engineering methods, easier configuration, and SDN adoption.

With two different technologies, one within the data center and one in the Core, it is natural to handoff from VXLAN to an MPLS-based core at the DCI nodes. These nodes which sit on the edge of the DC domain, interfacing with the Core edge router.

Guidelines and Limitations for Configuring Seamless Integration of EVPN with L3VPN (MPLS LDP)

The following are the guidelines and limitations for Configuring Seamless Integration of EVPN with L3VPN (MPLS LDP):

The following features are supported:

  • Layer 3 orphans

  • MPLS extended ECMP (enabled by default)

The following features are not supported:

  • Subnet stretches across the DC domain

  • vPC

  • SVI/Subinterfaces

Configuring Seamless Integration of EVPN with L3VPN (MPLS LDP)

These configuration steps are required on a DCI switch to import and re-originate the routes from a VXLAN domain to an MPLS domain and back to a VXLAN domain.

SUMMARY STEPS

  1. configure terminal
  2. feature mpls l3vpn
  3. feature mpls ldp
  4. nv overlay evpn
  5. router bgp number
  6. address-family ipv4 unicast
  7. redistribute direct route-map route-map-name
  8. exit
  9. address-family l2vpn evpn
  10. exit
  11. neighbor address remote-as number
  12. update-source type/id
  13. ebgp-multihop ttl-value
  14. address-family ipv4 unicast
  15. send-community extended
  16. exit
  17. address-family vpnv4 unicast
  18. send-community extended
  19. import l2vpn evpn reoriginate
  20. neighbor address remote-as number
  21. address-family ipv4 unicast
  22. send-community extended
  23. address-family ipv6 unicast
  24. send-community extended
  25. address-family l2vpn evpn
  26. send-community extended
  27. import vpn unicast reoriginate

DETAILED STEPS

  Command or Action Purpose

Step 1

configure terminal

Example:

switch# configure terminal

Enters global configuration mode.

Step 2

feature mpls l3vpn

Example:

switch# feature mpls l3vpn

Enables the MPLS Layer 3 VPN feature.

Step 3

feature mpls ldp

Example:

switch# feature mpls ldp

Enables the MPLS Label Distribution Protocol (LDP).

Step 4

nv overlay evpn

Example:

switch(config)# nv overlay evpn

Enables the EVPN control plane for VXLAN.

Step 5

router bgp number

Example:

switch(config)# router bgp 100

Configures BGP. The value of the number argument is from 1 to 4294967295.

Step 6

address-family ipv4 unicast

Example:

switch(config-router)# address-family ipv4 unicast

Configures the address family for IPv4.

Step 7

redistribute direct route-map route-map-name

Example:

switch(config-router-af)# redistribute direct route-map passall

Configures the directly connected route map.

Step 8

exit

Example:

switch(config-router-af)# exit

Exits command mode.

Step 9

address-family l2vpn evpn

Example:

switch(config-router)# address-family l2vpn evpn

Configures the L2VPN address family.

Step 10

exit

Example:

switch(config-router-af)# exit

Exits command mode.

Step 11

neighbor address remote-as number

Example:

switch(config-router)# neighbor 108.108.108.108 remote-as 22

Configures a BGP neighbor. The range of the number argument is from 1 to 65535.

Step 12

update-source type/id

Example:

switch(config-router-neighbor)# update-source loopback100

Specifies the source of the BGP session and updates.

Step 13

ebgp-multihop ttl-value

Example:

switch(config-router-neighbor)# ebgp-multihop 10

Specifies the multihop TTL for the remote peer. The range of ttl-value is from 2 to 255.

Step 14

address-family ipv4 unicast

Example:

switch(config-router-neighbor)# address-family ipv4 unicast

Configures the unicast sub-address family.

Step 15

send-community extended

Example:

switch(config-router-neighbor-af)# send-community extended

Configures the community attribute for this neighbor.

Step 16

exit

Example:

switch(config-router-neighbor-af)# exit

Exits command mode.

Step 17

address-family vpnv4 unicast

Example:

switch(config-router-neighbor)# address-family vpnv4 unicast

Configures the address family for IPv4.

Step 18

send-community extended

Example:

switch(config-router)# send-community extended

Sends the extended community attribute.

Step 19

import l2vpn evpn reoriginate

Example:

switch(config-router)# import l2vpn evpn reoriginate

Reoriginates the route with a new RT.

Step 20

neighbor address remote-as number

Example:

switch(config-router)# neighbor 175.175.175.2 remote-as 1

Defines the neighbor.

Step 21

address-family ipv4 unicast

Example:

switch(config-router)# address-family ipv4 unicast

Configures the address family for IPv4.

Step 22

send-community extended

Example:

switch(config-router)# send-community extended

Configures the community for BGP neighbors.

Step 23

address-family ipv6 unicast

Example:

switch(config-router)# address-family ipv6 unicast

Configures the IPv6 unicast address family, which is required for IPv6 over VXLAN with an IPv4 underlay.

Step 24

send-community extended

Example:

switch(config-router)# send-community extended

Configures the community for BGP neighbors.

Step 25

address-family l2vpn evpn

Example:

switch(config-router)# address-family l2vpn evpn

Configures the L2VPN address family.

Step 26

send-community extended

Example:

switch(config-router)# send-community extended

Configures the community for BGP neighbors.

Step 27

import vpn unicast reoriginate

Example:

switch(config-router)# import vpn unicast reoriginate

Reoriginates the route with a new RT.