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Table Of Contents
Asymmetric to Symmetric IRB migration steps
1. Make the spines to send overlay traffic only to Leaf-2 by making Leaf-1 advertise VTEP IP with a higher metric in
the underlay network.
Leaf-1 configuration
a. Configure route-map with prefix-list to set the metric higher for the VTEP IP.
Leaf-1(config)# ip prefix-list vtep_ip seq 10 permit 10.10.10.1/32
Leaf-1(config)# route-map set_higher_metric permit 10
Leaf-1(config-route-map)# match ip address prefix-list vtep_ip
Leaf-1(config-route-map)# continue 20
Leaf-1(config-route-map)# set metric 100
Leaf-1(config-route-map)# exit
Leaf-1(config)# route-map set_higher_metric permit 20
Leaf-1(config-route-map)# exit
b. Configure the route-map to the underlay BGP neighbors towards Spine.
Leaf-1(config)# router bgp 65100
Leaf-1(config-router-bgp-65100)# neighbor 10.1.1.1
Leaf-1(config-router-neighbor)# address-family ipv4 unicast
Leaf-1(config-router-bgp-neighbor-af)# route-map set_higher_metric out
Leaf-1(config-router-bgp-neighbor-af)# exit
Leaf-1(config-router-neighbor)# exit
Leaf-1(config-router-bgp-65100)# neighbor 10.2.1.1
Leaf-1(config-router-neighbor)# address-family ipv4 unicast
Leaf-1(config-router-bgp-neighbor-af)# route-map set_higher_metric out
Leaf-1(config-router-bgp-neighbor-af)# end
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VXLAN