Administrator Guide

You must congure a dierent unit ID (0 or 1) on each peer switch.
Use this command to minimize the time required for the VLT system to determine the unit ID assigned to each peer switch
when one peer switch reboots.
8. Congure multi-domain VLT. Congure the port channel to be used for the VLT interconnect on a VLT switch and enter
interface conguration mode.
CONFIGURATION mode
interface port-channel id-number
Enter the same port-channel number congured with the peer-link port-channel command.
9. Place the interface in Layer 2 mode.
INTERFACE PORT-CHANNEL mode
switchport
10. Associate the port channel to the corresponding port channel in the VLT peer for the VLT connection to an attached device.
INTERFACE PORT-CHANNEL mode
vlt-peer-lag port-channel id-number
Valid port-channel ID numbers are from 1 to 128.
11. Ensure that the port channel is active.
INTERFACE PORT-CHANNEL mode
no shutdown
12. Add links to the mVLT port. Congure a range of interfaces to bulk congure.
CONFIGURATION mode
interface range {port-channel id}
13. Enable LACP on the LAN port.
INTERFACE mode
port-channel-protocol lacp
14. Congure the LACP port channel mode.
INTERFACE mode
port-channel number mode [active]
15. Ensure that the interface is active.
MANAGEMENT INTERFACE mode
no shutdown
16. Repeat steps 1 through 15 for the VLT peer node in Domain 1.
17. Repeat steps 1 through 15 for the rst VLT node in Domain 2.
18. Repeat steps 1 through 15 for the VLT peer node in Domain 2.
Verifying a VLT Conguration
To monitor the operation or verify the conguration of a VLT domain, use any of the following show commands on the primary and
secondary VLT switches.
• Display information on backup link operation.
EXEC mode
show vlt backup-link
Virtual Link Trunking (VLT)
843