I have a pair of Cisco Nexus 9k switches configured for vPC and recently one of my switches developed a fault which resulted in the working switch suspending all the vPC ports. Further investigation revealed the layer 3 vlan that had the IP addresses for the vpc keep-alive was down, which wasn't expected. To get the interface back I had to remove the 'vpc peer-link' from my port-channel and put it back.
Below is the config relating to my vPC - i've not included the entire config
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Swicth01
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feature lacp
feature vpc
vlan 901
name keepalive
vrf context management
vpc domain 1
role priority 900
peer-keepalive destination 10.70.108.13 source 10.70.108.12 vrf default
auto-recovery
interface Vlan8
no shutdown
management
ip address 10.70.108.12/24
interface port-channel10
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
spanning-tree port type network
vpc peer-link
interface Ethernet1/49
description *** VPC PEER LINKS ***
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
channel-group 10 mode active
no shutdown
interface Ethernet1/50
description *** VPC PEER LINKS ***
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
channel-group 10 mode active
no shutdown
interface mgmt0
vrf member management
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Switch02 - this one developed the fault
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feature lacp
feature vpc
vlan 901
name keepalive
vrf context management
vpc domain 1
role priority 10000
peer-keepalive destination 10.70.108.12 source 10.70.108.13 vrf default
auto-recovery
interface Vlan8
no shutdown
management
ip address 10.70.108.13/24
interface port-channel10
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
spanning-tree port type network
vpc peer-link
interface Ethernet1/49
description *** VPC PEER LINKS ***
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
channel-group 10 mode active
no shutdown
interface Ethernet1/50
description *** VPC PEER LINKS ***
switchport
switchport mode trunk
switchport trunk allowed vlan 1-5,8,10-12,201-202,300
channel-group 10 mode active
no shutdown
interface mgmt0
shutdown force
vrf member management
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I am not using the management interfaces - they are not plugged in.
My questions:
1. Does the config look correct
2. Should I expect to see this behaviour if either switch fails
Any help would be greatly appreciated
Regards
JB
