Administrator Guide

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. Enable peer routing.
VLT DOMAIN CONFIGURATION mode
peer-routing
If you enable peer routing, a VLT node acts as the proxy gateway for its peer.
5. (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).
6. (Optional) Prevent a possible loop during the bootup of a VLT peer switch or a device that accesses the VLT domain.
CONFIGURATION mode
lacp ungroup member-independent {vlt | port-channel port-channel-id}
LACP on VLT ports (on a VLT switch or access device), which are members of the virtual link trunk, is not brought up until the VLT
domain is recognized on the access device.
7. Repeat Steps 1 to 5 on the VLT peer switch to configure the IP address of this switch as the endpoint of the VLT backup link and to
configure the same port channel for the VLT interconnect.
Configuring a VLT Backup Link
To configure a VLT backup link, use the following command.
1. Specify the management interface to be used for the backup link through an out-of-band management network.
CONFIGURATION mode
interface managementethernet slot/port
Enter the slot (0-1) and the port (0).
2. Configure an IPv4 address (A.B.C.D) or IPv6 address (X:X:X:X::X) and mask (/x) on the interface.
MANAGEMENT INTERFACE mode
{ip address ipv4-address/ mask | ipv6 address ipv6-address/ mask}
This is the IP address to be configured on the VLT peer with the back-up destination command.
3. Ensure that the interface is active.
MANAGEMENT INTERFACE mode
no shutdown
4. Configure a VLT backup link using the IPv4 or IPv6 address of the VLT peer’s management interface.
MANAGEMENT INTERFACE mode
back-up destination {ip address ipv4-address/ mask | ipv6 address ipv6-address/ mask}
5. Repeat Steps 1 to 4 on the VLT peer switch.
To set an amount of time, in seconds, to delay the system from restoring the VLT port, use the delay-restore command at any time.
For more information, refer to VLT Port Delayed Restoration.
Configuring a VLT Port Delay Period
To configure a VLT port delay period, use the following commands.
1. Enter VLT-domain configuration mode for a specified VLT domain.
CONFIGURATION mode
vlt domain domain-id
The range of domain IDs from 1 to 1000.
2. Enter an amount of time, in seconds, to delay the restoration of the VLT ports after the system is rebooted.
Virtual Link Trunking (VLT)
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