Reference Guide

1006 | Virtual Link Trunking (VLT)
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Use the peer-down-vlan parameter to configure the VLAN where a VLT peer will forward received packets
over the VLTi from an adjacent VLT peer that is down. 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. .
Connect a VLT domain to an attached access device (switch or server)
Step Task Command Syntax Command Mode
On a VLT peer switch: Configure the same port channel ID number on each peer switch in the VLT domain to
connect to an attached device as follows:
1 Configure the same port channel to be used to connect to
an attached device and enter interface configuration
mode.
interface port-channel
id-number
CONFIGURATION
2 Remove an IP address from the interface.
no ip address
INTERFACE
PORT-CHANNEL
3 Place the interface in Layer 2 mode.
switchport
INTERFACE
PORT-CHANNEL
4 Add one or more port interfaces to the port channel.
interface specifies one of the following interface types:
1-Gigabit Ethernet: Enter gigabitethernet slot/port.
10-Gigabit Ethernet: Enter tengigabitethernet slot/port.
channel-member interface INTERFACE
PORT-CHANNEL
5 Ensure that the port channel is active.
no shutdown
INTERFACE
PORT-CHANNEL
6 Associate the port channel to the corresponding port
channel in the VLT peer for the VLT connection to an
attached device.
Valid port-channel ID numbers are from 1 to 128.
vlt-peer-lag port-channel
id-number
INTERFACE
PORT-CHANNEL
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: Configure a port channel to connect to the VLT domain and add port channels
to it. Figure 53-373 shows how to verify the port-channel configuration.
(Optional) Configure a VLT VLAN peer-down
Step Task Command Syntax Command Mode
1 Enter VLT-domain configuration mode for a specified
VLT domain.
Range of domain IDs: 1 to 1000.
vlt domain domain-id
CONFIGURATION
2 Enter the port-channel number that will act as the
interconnect trunk.
Range: 1 to 128.
peer-link port-channel
id-number
VLT DOMAIN
CONFIGURATION