Enabling VLT and Creating a VLT Domain
To enable VLT and create a VLT domain, use the following steps.
1 Enable VLT on a switch, then configure a VLT domain and enter VLT-domain configuration mode.
CONFIGURATION mode
vlt domain domain-id
The domain ID range is from 1 to 1000.
Configure the same domain ID on the peer switch to allow for common peering. VLT uses the domain
ID to automatically create a VLT MAC address for the domain. If you do not configure the system
explicitly, the system mac-address of the primary will be the VLT MAC address for the domain.
To disable VLT, use the no vlt domain command.
NOTE: Do not use MAC addresses such as “reserved” or “multicast.”
2 Configure the IP address of the management interface on the remote VLT peer to be used as the
endpoint of the VLT backup link for sending out-of-band hello messages.
VLT DOMAIN CONFIGURATION mode
back-up destination {ipv4-address | ipv6-address} [interval seconds]
You can optionally specify the time interval used to send hello messages. The range is from 1 to 5
seconds.
3 Configure the port channel to be used as the VLT interconnect between VLT peers in the domain.
VLT DOMAIN CONFIGURATION mode
peer-link port-channel id-number
4 (Optional) After you configure a VLT domain on each peer switch and connect (cable) the two VLT peers
on each side of the VLT interconnect, the system elects a primary and secondary VLT peer device (see
Primary and Secondary VLT Peers). To configure the primary and secondary roles before the election
process, use the primary-priority command. Enter a lower value on the primary peer and a higher
value on the secondary peer.
VLT DOMAIN CONFIGURATION mode
primary-priority value
The priority values are from 1 to 65535. The default is 32768.
If the primary peer fails, the secondary peer (with the higher priority) takes the primary role. If the
primary peer (with the lower priority) later comes back online, it is assigned the secondary role (there is
no preemption).
5 (Optional) Prevent a possible loop during the bootup of a VLT peer switch or a device that accesses the
VLT domain.
CONFIGURATION mode
Virtual Link Trunking (VLT) 1132
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