the port on the secondary switch to which the MIO/UMIO/MIO2 in slot 6 is connected, allowing it to redirect
and transport data.
Figure 9: Port Redundancy Failover in External Network Device Failure Scenario
In the example above, a switch failure causes a link down state on all ports connected to that switch. This
failure causes all redundant ports on the line card in slot 6 to move into the active state and utilize the redundant
switch.
Configuring MIO/UMIO/MIO2 Port Redundancy Auto-Recovery
You can configure a port auto-recovery feature. When a port failure occurs and the preferred port is returned
to service (link is up), control is automatically returned to that port. By default, ports are in a non-revertive
state, meaning that no ports are preferred; a manual port switch is required to return use to the original port.
This feature is applied on a per port basis (via the preferred slot keyword), allowing you to configure
specific ports to be used on individual MIO cards. For example, you could configure ports 10 through 19
as preferred on the MIO/UMIO in slot 5, and configure ports 20 through 29 as the preferred ports on the
MIO/UMIO in slot 6.
Important
Use the following example to configure a preferred port for revertive, automatic return to service when a
problem has cleared:
configure
port ethernet slot#/port#
preferred slot slot#
end
Notes
•
If you do specify a preference, redundancy is revertive to the specified card. If you do not specify a
preference, redundancy is non-revertive.
•
Repeat for each additional port that you want to make preferred.
Save the configuration as described in the Verifying and Saving Your Configuration chapter.
ASR 5500 System Administration Guide, StarOS Release 21.4
71
System Settings
Configuring MIO/UMIO/MIO2 Port Redundancy Auto-Recovery
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