EvPC Question

[ccraddock]

Community,

I recently dual homed a single 2238TQ FEX to 2x 9332PQ switches running NXOS 7.0.(3)I5(2). The FEX is showing online on both 9332PQs as seen here:

PHX-POD-1A# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
101 FEX2238TQ Online N2K-C2348TQ-10GE FOC2148R1NW

PHX-POD-1B# show fex
FEX FEX FEX FEX
Number Description State Model Serial
------------------------------------------------------------------------
101 FEX0101 Online N2K-C2348TQ-10GE FOC2148R1NW

However, when I make a config change to one of the FEX interfaces on one of the parent switches, that same config change is not mirrored across to the other parent switch.

My question is this: How do config changes work when you have two parent switches to one FEX in EvPC? For instance when I do a no shut on the Eth101/1/1 port on one switch, its still shows as Admin Down on the other. Am I missing a config? Thanks.

PHX-POD-1A# show run Fex

!Command: show running-config fex
!Time: Wed May 16 18:01:24 2018

version 7.0(3)I5(2)
install feature-set fex
feature-set fex

fex 101
pinning max-links 1
description "FEX2238TQ"

interface port-channel101
switchport mode fex-fabric
fex associate 101

interface Ethernet1/5
switchport mode fex-fabric
fex associate 101

PHX-POD-1A# show run int eth1/5

!Command: show running-config interface Ethernet1/5
!Time: Wed May 16 18:01:39 2018

version 7.0(3)I5(2)

interface Ethernet1/5
switchport
switchport mode fex-fabric
fex associate 101
channel-group 101
no shutdown

PHX-POD-1A# show run int po101

!Command: show running-config interface port-channel101
!Time: Wed May 16 18:01:43 2018

version 7.0(3)I5(2)

interface port-channel101
switchport
switchport mode fex-fabric
fex associate 101
vpc 101

PHX-POD-1B# show run fex

!Command: show running-config fex
!Time: Wed May 16 18:02:13 2018

version 7.0(3)I5(2)
install feature-set fex
feature-set fex

fex 101
pinning max-links 1
description "FEX0101"

interface port-channel101
switchport mode fex-fabric
fex associate 101

interface Ethernet1/5
switchport mode fex-fabric
fex associate 101

PHX-POD-1B# show run int eth1/5

!Command: show running-config interface Ethernet1/5
!Time: Wed May 16 18:02:17 2018

version 7.0(3)I5(2)

interface Ethernet1/5
switchport
switchport mode fex-fabric
fex associate 101
channel-group 101
no shutdown

PHX-POD-1B# show run int po101

!Command: show running-config interface port-channel101
!Time: Wed May 16 18:02:20 2018

version 7.0(3)I5(2)

interface port-channel101
switchport
switchport mode fex-fabric
fex associate 101
vpc 101

PHX-POD-1B#

Thanks!

[ccraddock]

Community,

After more troubleshooting I believe I may have solved this but would still like your feedback:

1) the vpc for each FEX interface was showing down* Inconsistent because the FEX interface was down (meaning nothing was plugged into it). After I plugged in a device to bring the interface up/up it came up.

2) Any change made on one parent device must be replicated to the other parent device, otherwise vpc flags it as inconsistent and bring the FEX port down. I noticed when I replicate the change across switches, it comes up fun showing success.

Is this right? There doesnt appear to be an "auto-sync" feature, you have to manually make the configs in both parent switches for it to be consistent.

Please let me know your thoughts. Thanks!

[mlund]

Hi

You can use config sync. see link

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_System_Management_Configuration_...

/Mikael