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Cisco Bug: CSCsy79717 - IXIA Test set Tunnels for scale testing intermittently do not come up

Last Modified

May 16, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.6.3.BASE

Description (partial)

Symptom:

IXIA Test set Tunnels for scale testing intermittently do not come up.   

Conditions:

The problem is specific to broadcast links (used for Ixia router tester) and only happens if NSR is enabled and multiple neighbors come to FULL state quickly one after each other.

We only inform TE when the first neighbor reaches the FULL state on broadcast link.  With NSR enabled, we first send the neighbor state to standby RP and only inform TE after we get the ACK from the standby that the first neighbor state has been installed there.

The problem is that we update the neighbor count before sending the state to standby, but we inform TE only after we get the ACK from the standby. If the second neighbor reaches the FULL state before we receive ACK from standby for the first neighbor reaching the FULL state, full neighbor count would have reached 2 and we would not notify TE.
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