Reference Guide

304 | Virtual Link Trunking (VLT)
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Use the following procedure to configure multi-domain VLT between two VLT domains on your network.
Refer to mVLT Configuration Example for a sample configuration.
(Optional) Configure Multi-Domain VLT (mVLT)
Step Task Command Syntax Command Mode
Set up the VLT domain.
1 Configure the port channel to be used for the VLT
interconnect on a VLT switch and enter interface
configuration mode.
Enter the same port-channel number configured with the
peer-link port-channel command.
interface port-channel
id-number
CONFIGURATION
2 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
3 Enter VLT-domain configuration mode for a specified
VLT domain.
Range of domain IDs: 1 to 1000.
vlt domain domain-id
CONFIGURATION
4 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
5 Configure 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.
You can optionally specify the time interval used to
send hello messages. Range: 1 to 5 seconds.
back-up destination
ip-address [interval seconds]
VLT DOMAIN
CONFIGURATION
6 When you create a VLT domain on a switch, the FTOS
software automatically creates a VLT-system MAC
address used for internal system operations.
Use the
system-mac command to explicitly configure
the default MAC address for the domain by entering a
new MAC address in the format: aaaa.bbbb.cccc.
You must also reconfigure the same MAC address on
the VLT peer switch.
Use this command to minimize the time required for the
VLT system to synchronize the default MAC address of
the VLT domain on both peer switches when one peer
switch reboots.
system-mac mac-address
mac-address
VLT DOMAIN
CONFIGURATION