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Cisco Bug: CSCuo74024 - STP BPDU received on vPC secondary not tunneled to vPC primary

Last Modified

Aug 25, 2020

Products (8)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5672UP Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases


Description (partial)

Symptom:After upgrading one of the Nexus 5500/6000 in VPC topology from 6.0(x) to 7.0(x) version whereas the other node still running old 6.0(x) version, STP disputes can be seen on upstream devices. If Bridge assurance is used, ports will be BA blocked.

Conditions:Seen in set ups in double sided VPC and one Nexus 5500/6000 in the VPC set up is running 6.0 and the other has been upgraded to 7.0 and when the VPC primary switch is upgraded first to 7.0

Related Community Discussions

N5K - 7.0(1)N1(1) upgrade (from 5.0 & 5.2)
Many of you might be upgrading to Version 7.0(1)N1(1) as it is becoming a standard. Though there are various features that might help, you need to take extra care during the overall IOS upgrade procedure for 7.0. If you upgrade from 7.0 from any version, there is a chance that your Zone might be isolated, and IP connectivity is lost to everything behind the pair of N5Ks. We just experienced this.   We upgraded from 5.0(3)N2(1) to 7.0(1)N1(1).   Firstly, after upgrading, we lost all FEX configs and ...
Latest activity: May 15, 2014
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