Users Guide

Enabling VLT and Creating a VLT Domain
To enable VLT and create a VLT domain:
1 Enable VLT on a switch, then congure a VLT domain and enter VLT-domain conguration mode.
CONFIGURATION mode
vlt domain domain-id
The domain ID range is from 1 to 1000.
Congure 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 congure 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 Congure 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 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 Congure 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 congure 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 congure 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) Enabled BMP booting of a TOR device through VLT nodes.
CONFIGURATION mode
lacp ungroup member-independent {vlt | port-channel port-channel-id}
NOTE
: You must enable RSTP when you use this feature.
6 Repeat Steps 1 to 4 on the VLT peer switch to congure the IP address of this switch as the endpoint of the VLT backup link and to
congure the same port channel for the VLT interconnect.
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Virtual Link Trunking (VLT)