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Cisco Bug: CSCtb30201 - 802.3 OAM session flaps after repeated "ifmgr" process restarts

Last Modified

Mar 06, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.9.0.BASE

Description (partial)

Description:

802.3 OAM sessions may flap due to failure to send heartbeat OAMPDUs when the ifmgr process restarts.

Symptoms:

One or more 802.3 OAM sessions on the node on which the process restarted may go down briefly, as indicated by messages similar to the following.

LC/0/4/CPU0:Jul  6 15:27:41.030 : ethernet_link_oam_daemon[158]: %L2-ELO-6-CPU_STARVED : Ethernet Link OAM Daemon has been unable to send heartbeats for 8547 ms 
LC/0/4/CPU0:Jul  6 15:27:41.030 : ethernet_link_oam_daemon[158]: %L2-ELO-6-INTF_SESSION_DOWN : TenGigE0/4/0/1: OAM session has gone down 
LC/0/4/CPU0:Jul  6 15:27:41.043 : ethernet_link_oam_daemon[158]: %L2-ELO-6-INTF_SESSION_UP : TenGigE0/4/0/1: OAM session has come up

Conditions:

The problem can occur when the ifmgr process is restarted using the <CmdBold>process restart<noCmdBold> command, restarts during a software installation event, or restarts unexpectedly due to a defect. The problem is more likely to occur if the process restarts multiple times in quick succession.
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