Asr 5500 System Administration Guide, Staros Release 21.4 - Cisco ASR 5000 Series Administration Manual

System Settings
Configuring MIO/UMIO/MIO2 Port Redundancy
With port redundancy, if a failover occurs, only the specific port(s) become active. For example; if port 5/1
fails, then port 6/1 becomes active, while all other active ports on the line card in slot 5 remain in the same
active state. In port failover situations, use the show port table command to check that ports are active on
both cards and that both cards are active.
Take care when administratively disabling a port that is one of a redundant pair. A redundant pair comprises
both the active and standby ports—for example 5/1 and 6/1. If 5/1 is active, administratively disabling 5/1
through the CLI does not make 6/1 active. It disables both 5/1 and 6/1 because an action on one port has the
same effect on both. Refer to Creating and Configuring Ethernet Interfaces and Ports in System Interface
and Port Configuration Procedures.
With automatic card-level redundancy, there is no port-level redundancy in an MIO/UMIO failover. The
standby MIO/UMIO/MIO2 becomes active and all ports on that card become active. The system automatically
copies all the MAC addresses and configuration parameters used by the failed MIO/UMIO/MIO2 to its
redundant counterpart. The ports on MIOs keep their original MAC addresses, and the system automatically
copies the failed MIO/UMIO/MIO2's configuration parameters to its redundant counterpart.
Port redundancy can be configured to be revertive or non-revertive. With revertive redundancy service is
returned to the original port when service is restored.

ASR 5500 System Administration Guide, StarOS Release 21.4

69