VRF: Backup Routing

EFA Provisioning

IPv4 and IPv6 range will be input at the fabric level. An IPv4 and an IPv6 address pair will be allocated to every MCT pair across all the tenant VRFs and the BGP session will be established between the same IP Pair.

Allocations happen per device:

Allocate a Bridge domain per VRF for backup routing.
Allocate a corresponding router-interface VE per BD/VRF.
Assign the IPv4 and IPv6 address allocated to each device on each of the VE interface.
Note
Same IPv4 and IPv6 address will be allocated on each of the VE interface belonging to different VRF.
Establish IBGP IPV4 neighborship with the MCT peer on a set of IP address per VRF.
Establish IBGP IPv6 neighborship with the MCT peer on a set of IPv6 address per VRF.
Configure "next-hop-self" on both the IPv4 and IPv6 neighbor.
Configure "active" on the IPv6 neighbor.

Example:

efa fabric setting update --name fabric1
--backup-routing-ipv4-range 21.1.1.0/24 --backup-routing-ipv6-range 2001:21:1:1::0/120

Example where backup routing is enabled:

efa fabric setting update --name nc --backup-routing-enable yes

Device Config

Table 1. Tenant1 VRF “vrf1”

leaf-9250-173# show running-config bridge-domain 3001 bridge-domain 3001 p2mp pw-profile default router-interface Ve 7001 bpdu-drop-enable ! leaf-9250-173# sh run in ve 7001 interface Ve 7001 vrf forwarding vrf1 ip address 21.1.1.10/31 ipv6 address 2001:21:1:1::10/127 no shutdown !	leaf-9250-173# show running-config router bgp address-family ipv4 unicast vrf vrf1 router bgp address-family ipv4 unicast vrf vrf1 local-as 4210000001 redistribute connected neighbor 21.1.1.11 remote-as 4210000001 neighbor 21.1.1.11 next-hop-self maximum-paths 2 ! ! leaf-9250-173# show running-config router bgp address-family ipv6 unicast vrf vrf1 router bgp address-family ipv6 unicast vrf vrf1 redistribute connected neighbor 2001:21:1:1::11 next-hop-self neighbor 2001:21:1:1::11 remote-as 4210000001 neighbor 2001:21:1:1::11 activate maximum-paths 2 ! !

Table 2. Tenant2 VRF “vrf2”

leaf-9250-173# show running-config bridge-domain 3002 bridge-domain 3002 p2mp pw-profile default router-interface Ve 7002 bpdu-drop-enable ! leaf-9250-173# sh run in ve 7002 interface Ve 7002 vrf forwarding vrf2 ip address 21.1.1.10/31 ipv6 address 2001:21:1:1::10/127 no shutdown !	leaf-9250-173# show running-config router bgp address-family ipv4 unicast vrf vrf2 router bgp address-family ipv4 unicast vrf vrf2 local-as 4210000001 redistribute connected neighbor 21.1.1.11 remote-as 4210000001 neighbor 21.1.1.11 next-hop-self maximum-paths 2 ! ! leaf-9250-173# show running-config router bgp address-family ipv6 unicast vrf vrf2 router bgp address-family ipv6 unicast vrf vrf2 redistribute connected neighbor 2001:21:1:1::11 next-hop-self neighbor 2001:21:1:1::11 remote-as 4210000001 neighbor 2001:21:1:1::11 activate maximum-paths 2 ! !