Description

Issue is observed when a physical connection in the ring is removed, things failover perfectly, but after reconnecting the link, the reconvergence takes a lot of time.

Symptoms

ERPS ring reconvergence takes lot of time, after a failover.

Solution

> check the ERPS configuration.

 

> We can configure restore-interval (on all the nodes):

 

The restore interval is the time the RPL owner node waits after the last ring automatic protection switching (RAPS) signal failure (SF) event has been cleared, to see if any further RAPS events occur. During this time interval, the RPL owner continues to process RAPS packets, and the ring remains in protection state with the RPL link unblocked. When this interval expires, if no further RAPS SF events have been reported, the RPL owner reverts the protection switching, blocks the RPL link, and returns the protection ring to idle state.

 

[edit protocols protection-group ethernet-ring ring-name]

user@switch# set restore-interval restore-interval-value

 

The default restore-interval value is set for 5mins.

Restore-interval can be set between 1 to 12mins. Hence, we can decrease the restore-interval and set it to 1min, after which the ring converges quickly.

 

ERPS ring state can be verified by using the below commands:

> show protection-group ethernet-ring aps

> show protection-group ethernet-ring interface

> show protection-group ethernet-ring node-state

> show protection-group ethernet-ring statistics

Modification History

2023-10-28 : Article Created

Related Information

Case no: 2023-0925-776263