Connectivity Guide

Configure VLT
Verify that both VLT peer devices are running the same OS version. For VRRP operation, configure VRRP groups and L3 routing
on each VLT peer.
Configure the following settings on each VLT peer device separately.
1. (Optional) To prevent loops in VLT domain, enable the STP globally using the spanning-tree mode {rstp | rapid-
pvst | mst} command.
2. Create a VLT domain by configuring the same domain ID on each peer using the vlt-domain command.
3. (Optional) To override the default VLT primary election mechanism based on the system MAC addresses of the VLT nodes,
configure a VLT node priority for each of the VLT nodes using the primary-priority command. Enter a lower priority
value for the desired primary VLT peer and a higher priority value for the desired secondary VLT peer.
4. Configure the VLTi interfaces on each peer using the discovery-interface command. After you configure both sides of
the VLTi, the primary and secondary roles in the VLT domain are automatically assigned if primary priority is not configured.
5. (Optional) Manually reconfigure the default VLT MAC address. Configure the VLT MAC address in both VLT peers.
6. (Optional) Configure a time interval to delay bringing up VLT ports after reload or when VLTi come up after failure.
7. Configure the VLT backup link the heartbeat use with the backup destination {ip-address | ipv6 ipv6–
address } [vrf management] [interval interval-time] command.
8. Configure VLT port-channels between VLT peers and an attached device using the vlt-port-channel command. Assign
the same VLT port-channel ID from 1 to 1024 to interfaces on different peers that you bundle together. The peer interfaces
appear as a single VLT LAG to downstream devices.
9. Connect peer devices in a VLT domain to an attached access device or server.
Virtual Link Trunking
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