Nexus 5K Peer Link Not Coming Up

Terry MacDougal · ‎10-27-2013

Would a difference in the network QoS cause the vPC not to come up? As you can see below, the Network QoS (MTU) are different. If so, how do I change these values?

Thank Yougfvvv

Legend:

Type 1 : vPC will be suspended in case of mismatch

Name Type Local Value Peer Value

------------- ---- ---------------------- -----------------------

QoS 2 ([], [3], [], [], [], -

[])

Network QoS (MTU) 2 (1538, 2196, 0, 0, 0, -

0)

Legend:

Type 1 : vPC will be suspended in case of mismatch

Name Type Local Value Peer Value

------------- ---- ---------------------- -----------------------

QoS 2 ([], [], [], [], [], -

[])

Network QoS (MTU) 2 (1538, 0, 0, 0, 0, 0) -

Network Qos (Pause) 2 (F, F, F, F, F, F) -

glen.grant · ‎10-27-2013

It will usually tell you in the logg buffer the reason why it was suspending . Also the command show vpc consistency parameters will show you what it checks and I believe it will show you both sides of the link.

Terry MacDougal · ‎10-27-2013

N5K-1

Name                        Type Local Value            Peer Value
-------------               ---- ---------------------- -----------------------
QoS                         2     ([], [], [], [], [],   -
                                  [])
Network QoS (MTU)           2     (1538, 0, 0, 0, 0, 0) -
Network Qos (Pause)         2     (F, F, F, F, F, F)     -
Input Queuing (Bandwidth)   2     (100, 0, 0, 0, 0, 0)   -
Input Queuing (Absolute     2     (F, F, F, F, F, F)     -
Priority)
Output Queuing (Bandwidth) 2     (100, 0, 0, 0, 0, 0)   -
Output Queuing (Absolute    2     (F, F, F, F, F, F)     -
Priority)
STP Mode                    1     Rapid-PVST             -
STP Disabled                1     None                   -
STP MST Region Name         1     ""                     -
STP MST Region Revision     1     0                      -
STP MST Region Instance to 1                            -
VLAN Mapping
STP Loopguard               1     Disabled               -
STP Bridge Assurance        1     Enabled                -
STP Port Type, Edge         1     Normal, Disabled,      -
BPDUFilter, Edge BPDUGuard        Disabled
STP MST Simulate PVST       1     Enabled                -
Allowed VLANs               -     -                      -
Local suspended VLANs       -     -                      -

N5K-2

Name                        Type Local Value            Peer Value
-------------               ---- ---------------------- -----------------------
QoS                         2     ([], [3], [], [], [], -
                                  [])
Network QoS (MTU)           2     (1538, 2196, 0, 0, 0, -
                                  0)
Network Qos (Pause)         2     (F, T, F, F, F, F)     -
Input Queuing (Bandwidth)   2     (50, 50, 0, 0, 0, 0)   -
Input Queuing (Absolute     2     (F, F, F, F, F, F)     -
Priority)
Output Queuing (Bandwidth) 2     (50, 50, 0, 0, 0, 0)   -
Output Queuing (Absolute    2     (F, F, F, F, F, F)     -
Priority)
STP Mode                    1     Rapid-PVST             -
STP Disabled                1     None                   -
STP MST Region Name         1     ""                     -
STP MST Region Revision     1     0                      -
STP MST Region Instance to 1                            -
VLAN Mapping
STP Loopguard               1     Disabled               -
STP Bridge Assurance        1     Enabled                -
STP Port Type, Edge         1     Normal, Disabled,      -
BPDUFilter, Edge BPDUGuard        Disabled
STP MST Simulate PVST       1     Enabled                -
Allowed VLANs               -     -                      -
Local suspended VLANs       -

#

ho vpc br
Legend:
(*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 1
Peer status                       : peer link is down
vPC keep-alive status             : peer is alive
Configuration consistency status : failed
Per-vlan consistency status       : success
Configuration inconsistency reason: Consistency Check Not Performed
Type-2 inconsistency reason       : Consistency Check Not Performed
vPC role                          : none established
Number of vPCs configured         : 0
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Disabled (due to peer configuration)
Auto-recovery status              : Disabled

vPC Peer-link status
---------------------------------------------------------------------
id   Port   Status Active vlans
--   ----   ------ --------------------------------------------------
1    Po1    down   -

Reza Sharifi · ‎10-27-2013

The peer link between the switches are down.

Can you post "sh run" from both switches and tell us what ports are used as peer links?

Also, is vPC keep alive configured on both switches?

HTH

Terry MacDougal · ‎10-27-2013

vPC keep-alive is configured as the mgmt interface.....

ports 1/1 and 1/2 are being used as the peer links.....

l33d5un1t3d · ‎10-28-2013

Terry,

I take it as you are using the mgmt infterfaces you have them set up something like ..........

interface mgmt0

ip access-group MGMT-IN in

ip address 1.1.1.2/24

and the vpc domain configured something like...............

"peer-keepalive destination 1.1.1.1 source 1.1.1.2"

and vice-versa on the other switch?

Keith