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Cisco Bug: CSCvs42803 - Queued call disruptions due to MDS Sync delay on duplex VRU PG across WAN

Last Modified

Oct 01, 2020

Products (1)

  • Cisco Unified Contact Center Enterprise

Known Affected Releases

10.5(1) 11.5(1) 11.6(1) 12.0(1) 12.5(1)

Description (partial)

MDS sync delay messages on duplex VRU PG nodes across WAN is observed with the combination of high CPS/call volume and ECC variables

 Following error observed in the PG MDS logs.
 10:16:06:941 PG15A-mds MDS message sync delay exceeded 3000 ms (Now: 3401, Avg: 1974, Max: 3401, Min: 0).
10:16:12:334 PG15A-mds MDS message sync delay exceeded 3000 ms (Now: 5382, Avg: 2655, Max: 5382, Min: 0).
10:16:23:895 PG15A-mds MDS message sync delay exceeded 3000 ms (Now: 11559, Avg: 4435, Max: 11559, Min: 0)

All this eventually leads to call failure if waiting CVP does not receive updated instruction within 5 seconds.

VRU PG with 4 PIMs all active on same side, cluster across a WAN sharing private network. 
QoS enabled on the PG but not in the network. 
TCP ack delay generally 70 ms RTT, but frequently 120 ms and sometimes 240 ms RTT.
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