Reference Guide

Configure VLT LAG — peer 1
OS10(config)# interface port-channel 10
OS10(conf-if-po-10)# vlt-port-channel 1
Configure VLT LAG — peer 2
OS10(config)# interface port-channel 20
OS10(conf-if-po-20)# vlt-port-channel 1
VLT unicast routing
VLT unicast routing enables optimized routing where packets destined for the L3 endpoint of the VLT peer are locally routed.
VLT unicast routing is supported for IPv4 and IPv6.
To enable VLT unicast routing, both VLT peers must be in L3 mode. The VLAN configuration must be symmetrical on both
peers. You cannot configure the same VLAN as L2 on one node and as L3 on the other node.
1. Enter the VLT domain ID in CONFIGURATION mode, from 1 to 1024.
vlt-domain domain-id
2. Enable peer-routing in VLT-DOMAIN mode.
peer-routing
3. Repeat the steps on the VLT peer.
Configure unicast routing — peer 1
OS10(config)# vlt-domain 1
OS10(conf-vlt-1)# peer-routing
View unicast routing — peer 1
do show running-configuration vlt
!
vlt-domain 1
discovery-interface ethernet1/1/3-1/1/6,1/1/53:1-1/1/53:4,1/1/54:1-1/1/54:4
peer-routing
Configure unicast routing — peer 2
OS10(config)# vlt-domain 1
OS10(conf-vlt-1)# peer-routing
View unicast routing — peer 2
do show running-configuration vlt
!
vlt-domain 1
discovery-interface ethernet1/1/3-1/1/6,1/1/53:1-1/1/53:4,1/1/54:1-1/1/54:4
peer-routing
VRRP Optimized Forwarding
To enable optimized L3 forwarding over VLT, use VRRP Active-Active mode. By default, VRRP Active-Active mode is enabled
on the VLAN interfaces. In Active-Active mode, each peer locally forwards L3 traffic, resulting in reduced traffic flow over the
VLTi. Configure the same L3 static and dynamic routing on each peer so that L3 reachability and routing tables are the same on
both peers.
1. Enable VRRP Active-Active mode in VLAN-INTERFACE mode.
vrrp mode active-active
688
Virtual Link Trunking