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Cisco Bug: CSCup74458 - few seconds of packet loss on vpc secondary link bringup

Last Modified

Mar 30, 2018

Products (9)

  • Cisco Nexus 6000 Series Switches
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 56128P Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

6.0(2)N2(3) 7.0(2)N1(1)

Description (partial) 

Symptom:
Few seconds of packet loss seen on VPC link bringup.  Drops would correspond with PIF drop counter on fex uplink port

N6K-2(config-if)# show platform fwm info pif ethernet 1/7/1 | grep drop
Eth1/7/1 pd: tx stats: bytes 204948156412 frames 2328371667 discard 0 drop 0 
Eth1/7/1 pd: rx stats: bytes 177822996614 frames 2388580485 discard 0 drop 1173850 <---HERE

Conditions:
VPC is being restored on a Nexus 5K/6K and traffic re-hashes to the newly brought up VPC. The delay is due to VLAN programming on the VPC trunk.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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