API Guide

2. Spines would now send the overlay traffic destined to VLT domain 1 (Rack1) only to Leaf-2.
3. Configure Symmetric IRB mode in Leaf-2.
Leaf-2 configuration
a. Configure router-mac.
Leaf-2(config)# evpn
Leaf-2(config-evpn)# router-mac 02:10:10:10:10:10
b. Configure IP VRF with L3 VNI.
Leaf-2(config-evpn)# vrf BLUE
Leaf-2(config-evpn-vrf-VRF001)# vni 65001
c. Configure RT (auto or manual) and RD (optional, default is auto).
Leaf-2(config-evpn-vrf-BLUE)# route-target auto
d. Advertise IPv4 and IPv6 connected routes.
Leaf-2(config-evpn-vrf-BLUE)# advertise ipv4 connected
Leaf-2(config-evpn-vrf-BLUE)# advertise ipv6 connected
4. Leaf-2 is changed to Symmetric IRB mode. VTEPs in other racks could be using Symmetric IRB or Asymmetric IRB based
on its own local configuration. Irrespective of what other remote VTEPs use, Leaf-2 could now handle VXLAN encapsulated
traffic from both symmetric and asymmetric modes.
5. Configure Symmetric IRB in Leaf-1.
Leaf-1 configuration
a. Configure router-mac.
Leaf-1(config)# evpn
Leaf-1(config-evpn)# router-mac 02:10:10:10:10:10
b. Configure IP VRF with L3 VNI.
Leaf-1(config-evpn)# vrf BLUE
Leaf-1(config-evpn-vrf-VRF001)# vni 65001
c. Configure RT (auto or manual) and RD (optional, default is auto).
Leaf-1(config-evpn-vrf-BLUE)# route-target auto
d. Advertise IPv4 and IPv6 connected routes.
Leaf-1(config-evpn-vrf-BLUE)# advertise ipv4 connected
Leaf-1(config-evpn-vrf-BLUE)# advertise ipv6 connected
6. Remove the BGP MED configuration in Leaf-1. Spines start sending traffic to Leaf-1 as well. ECMP path from Spines
towards Leaf-1 and Leaf-2 is restored.
Leaf-1 configuration
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)# no 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)# no route-map set_higher_metric out
Leaf-1(config-router-bgp-neighbor-af)# end
7. Rack1 is migrated to use Symmetric IRB.
8. Repeat Steps 1-to-6 on Rack2 and other racks as well.
9. After changing all Racks to Symmetric IRB, you can perform the following optional configuration changes:
a. If the L2 VNI (MAC-VRF VNI) does not have local hosts in the VTEPs, you can remove those VNIs on those VTEPs.
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BGP EVPN for VXLAN