Reference Guide

– 1-Gigabit Ethernet: enter gigabitethernet slot/port.
– 10-Gigabit Ethernet: enter tengigabitethernet slot/port.
5. Ensure that the port channel is active.
INTERFACE PORT-CHANNEL mode
no shutdown
6. 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
The valid port-channel ID numbers are from 1 to 128.
7. Repeat Steps 1 to 6 on the VLT peer switch to configure the same port channel as part of the VLT domain.
8. On an attached switch or server: To connect to the VLT domain and add port channels to it, configure a port
channel. For an example of how to verify the port-channel configuration, refer to VLT Sample Configuration.
To configure the VLAN where a VLT peer forwards received packets over the VLTi from an adjacent VLT peer that is
down, use the peer-down-vlan parameter. When a VLT peer with BMP reboots, untagged DHCP discover packets
are sent to the peer over the VLTi. Using this configuration ensures the DHCP discover packets are forwarded to the
VLAN that has the DHCP server.
Configuring a VLT VLAN Peer-Down (Optional)
To configure a VLT VLAN peer-down, 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 is from 1 to 1000.
2. Enter the port-channel number that acts as the interconnect trunk.
VLT DOMAIN CONFIGURATION mode
peer-link port-channel id-number
The range is from 1 to 128.
3. Enter the VLAN ID number of the VLAN where the VLT forwards packets received on the VLTi from an adjacent
peer that is down.
VLT DOMAIN CONFIGURATION mode
peer-down-vlan vlan interface number
The range is from 1 to 4094.
Configuring Enhanced VLT (eVLT) (Optional)
To configure enhanced VLT (eVLT) between two VLT domains on your network, use the following procedure.
For a sample configuration, refer to eVLT Configuration Example. To set up the VLT domain, use the following commands.
1. Configure the port channel to be used for the VLT interconnect on a VLT switch and enter interface configuration
mode.
CONFIGURATION mode
interface port-channel id-number
Enter the same port-channel number configured with the peer-link port-channel command in the
Enabling VLT and Creating a VLT Domain.
2. Add one or more port interfaces to the port channel.
INTERFACE PORT-CHANNEL mode
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