Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 144

Improper Configurations
S e n d d o c u m e n t c o m m e n t s t o n e x u s 5 k - d o c f e e d b a c k @ c i s c o . c o m .
vPC in blocking state
Possible Cause
A bridge protocol data unit (BPDU) only sends data on a single link of a port channel. If a bridge
assurance (BA) dispute is detected, then vPC moves into a blocking state.
Solution
Do not enable bridge assurance on the vPC link: because of the following:
•
•
vPC domain ids
Possible Cause
The vPC domain IDs of two switches do not match.
Solution
Compare the vPC domain IDs of the two switches and ensure that they match.
Example:
switch1# show vpc brief
Legend:
vPC domain id
Peer status
vPC keep-alive status
Configuration consistency status: success
vPC role
Number of vPCs configured
Peer Gateway
Dual-active excluded VLANs
vPC Peer-link status
---------------------------------------------------------------------
id
--
1
switch2# show vpc brief
Legend:
vPC domain id
Peer status
vPC keep-alive status
Configuration consistency status: success
vPC role
Number of vPCs configured
Peer Gateway
Dual-active excluded VLANs
vPC Peer-link status
---------------------------------------------------------------------
Cisco Nexus 5000 Series Troubleshooting Guide
8-2
Cannot be used on a spanning tree port type network.
Prevents you from encountering ISSU issues. Bridge assurance should only be enabled on the vPC
peer link.
(*) - local vPC is down, forwarding via vPC peer-link
Port Status Active vlans
---- ------ --------------------------------------------------
Po500 down -
(*) - local vPC is down, forwarding via vPC peer-link
Chapter 8
: 500
: peer link is down
: Suspended (Destination IP not reachable)
: secondary, operational primary
: 4
: Disabled
: -
: 1
: peer link is down
: Suspended (Destination IP not reachable)
: primary
: 4
: Disabled
: -
Troubleshooting Virtual Port Channel Issues
OL-25300-01