Arista MPLS VPN Step by Step (1c) MPLS L3VPN PE/CE eBGP

Following the previous blog, in this post I will discuss the PE/CE routing option - eBGP. Here is the simplified topology

PE Configuration

router bgp 65001

   router-id 88.255.22.22

   neighbor vpnv4-rr peer-group

   neighbor vpnv4-rr remote-as 65001

   neighbor vpnv4-rr update-source Loopback88

   neighbor vpnv4-rr send-community standard extended

   neighbor vpnv4-rr maximum-routes 12000 

   neighbor 88.255.1.1 peer-group vpnv4-rr

   neighbor 88.255.2.2 peer-group vpnv4-rr

   address-family vpn-ipv4

      neighbor vpnv4-rr activate

      neighbor default encapsulation mpls next-hop-self source-interface Loopback88

   !

   vrf pe2-ebgp

      rd 200:20

      route-target import vpn-ipv4 100:20

      route-target import vpn-ipv4 200:20

      route-target export vpn-ipv4 200:20

      maximum-paths 2 ecmp 2

      neighbor 200.200.20.2 remote-as 65500

      neighbor 200.200.20.2 maximum-routes 12000 

      redistribute connected

CE configuration is as below. In my lab, I use vrf on CE router to segregate and simulate different CEs. 

router bgp 65500

   router-id 100.255.100.100

   !

   vrf ce1-ebgp

      rd 100:20

      neighbor 100.100.20.11 remote-as 65001

      ! need alllowas-in to permit remote prefix with same AS#

      neighbor 100.100.20.11 allowas-in 3

      neighbor 100.100.20.11 maximum-routes 12000 

      redistribute connected