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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)

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

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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