The Hot Standby Pseudowire Support for ATM and TDM Access Circuits feature improves the availability of L2VPN pseudowires
by detecting failures and handling them with minimal disruption to the service.
The Hot Standby Pseudowire Support for ATM and TDM Access Circuits feature allows the backup pseudowire to be in a “hot standby”
state, so that it can immediately take over if the primary pseudowire fails. The L2VPN Pseudowire Redundancy feature allows
you to configure a backup pseudowire too, but in a cold state. With the L2VPN Pseudowire Redundancy feature, if the primary
pseudowire fails, it takes time for the backup pseudowire to take over, which causes a loss in traffic.
If you have configured L2VPN Pseudowire Redundancy on your network and upgrade to Cisco IOS Release 15.1(1)S, you do not need
add any other commands to achieve Hot Standby Pseudowire Support for ATM and TDM Access Circuits. The backup pseudowire will
automatically be in a hot standby state.