Cisco N5K-M1600 - Expansion Module - 6 Ports Troubleshooting Manual page 149

Chapter 8 Troubleshooting Virtual Port Channel Issues
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 .
switch1(config-if-range)# channel-group 500
switch1(config-if-range)# int po 500
switch1(config-if)# vpc peer-link
Notice that the spanning tree port type has changed to a network port type on the vPC peer link.
This enables spanning tree bridge assurance on the vPC peer link, provided that STP bridge assurance
is not disabled. (STP bridge assurance is enabled by default.)
Check the vPC again.
switch1(config-if)# 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
Port channel 500 and the peer-link are now up. The vPC is successful.
vPC Consistency parameter issues
Possible Cause
vPC is not operational if type 1 consistency parameters do not match on both Nexus 5000 switches.
Solution
Ensure that type 1 consistency parameters match.
The possible values for type are 1, 2, or -. Items that are type 1 must match on both Nexus 5000 switches.
If they do not match, then vPC is suspended. Starting with Release 5.0, a type 2 was introduced. Items
that are type 2 do not have to match on both Nexus 5000 switches for the vPC to be operational.
The command in the following example displays local and peer values. Run the command on both
switches to ensure that the type 1 items match.
Example:
To check for a mismatch, display the consistency parameters.
switch1# show vpc consistency-parameters global
Name
-------------
OL-25300-01
(*) - local vPC is down, forwarding via vPC peer-link
Port Status Active vlans
---- ------ --------------------------------------------------
Po500 up 1,19,91,99,757
Legend:
Type 1 : vPC will be suspended in case of mismatch
: 500
: peer adjacency formed ok
: peer is alive
: primary
: 4
: Disabled
: -
Type Local Value
---- ---------------------- -----------------------
Cisco Nexus 5000 Series Troubleshooting Guide
Improper Configurations
Peer Value
8-7