Users Guide

Table Of Contents
Congure a VLT port channel
A VLT port channel, also known as a virtual link trunk, links an attached device and VLT peer switches. OS10 supports a maximum of 128
VLT port channels per node.
1 Enter the port channel ID number on the VLT peer in INTERFACE mode, from 1 to 128.
interface port-channel id-number
2 Assign the same ID to a VLT port channel on each VLT peer. The peers are seen as a single switch to downstream devices.
vlt-port-channel vlt-port-channel-id
3 Repeat the steps on the VLT peer.
Congure VLT port channel — peer 1
OS10(config)# interface port-channel 20
OS10(conf-if-po-20)# vlt-port-channel 20
Congure VLT port channel — peer 2
OS10(config)# interface port-channel 20
OS10(conf-if-po-20)# vlt-port-channel 20
Congure VLT peer routing
VLT peer routing enables optimized routing where packets destined for the L3 endpoint of the VLT peer are locally routed. VLT supports
unicast routing of both IPv4 and IPv6 trac.
To enable VLT unicast routing, both VLT peers must be in L3 mode. The VLAN conguration must be symmetrical on both peers. You
cannot congure 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 255.
vlt-domain domain-id
2 Enable peer-routing in VLT-DOMAIN mode.
peer-routing
3 Repeat the steps on the VLT peer.
Congure unicast routing — peer 1
OS10(config)# vlt-domain 1
OS10(conf-vlt-1)# peer-routing
Congure unicast routing — peer 2
OS10(config)# vlt-domain 1
OS10(conf-vlt-1)# peer-routing
Congure VRRP Active-Active mode
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 this mode, each peer locally forwards L3 trac, eliminating trac ow across the VLTi link. Congure the same static and
dynamic L3 routing on each peer to ensure 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
2 Congure VRRP on the L3 VLAN that spans both peers.
3 Repeat the steps on the VLT peer.
Virtual Link Trunking
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