Users Guide

Link Aggregation 1041
to the primary switch for handling. FDB entries learned on MLAG
interfaces are synced between the two devices.
console(config)#interface range gi1/0/1-4
console(config-if)#channel-group 2 mode active
console(config-if)#exit
console(config)#interface range gi1/0/5-8
console(config-if)#channel-group 3 mode active
console(config-if)#exit
console(config)#interface port-channel 2
console(config-if-Po2)#switchport mode trunk
console(config-if-Po2)#vpc 1
console(config-if-Po2)#exit
console(config)#interface port-channel 3
console(config-if-Po3)#switchport mode trunk
console(config-if-Po3)#vpc 2
console(config-if-Po3)#exit
Switch Firmware Upgrade Procedure
MLAG supports minimally intrusive firmware upgrade of the MLAG peer
switches. In most cases, protocols with retransmission capability, e.g., TCP,
will experience a limited interruption of service. Network operators must
ensure that the aggregate bandwidth in use on the MLAG can be supported
on a single MLAG peer.
Use the show vpc brief command to determine which switch is the primary
switch. This procedure upgrades the standby switch first, followed by the
primary switch. Following this order reduces the reconvergence time to the
minimum.
Upgrade Steps
Copy the new firmware to both the primary and secondary switches and
activate it. Disable DCPDP if enabled:
1 On the secondary switch, disable DCPDP if enabled and save the
configuration.
2 On the primary switch, disable DCPDP if enabled and save the
configuration.
Upgrade the MLAG secondary switch:
1 On the MLAG secondary switch, shut down the MLAG-enabled physical
links (not the port-channel). Do not save the running-config.