Nexus 5k/2k impossible to create vPC on FEX

[Clement BONNAL]

Hello,

I have a pair of n5k, with 10* n2k dual homed.

I have a Po for a server connected on 2 different n2k, but when I try to add vPC ID the Nexus reject my command.

NEX-A# sh port-ch sum
201   Po201(SD)   Eth      LACP      Eth1/23(D)   Eth1/24(D)
303   Po303(SD)   Eth      LACP      Eth104/1/11(D)  Eth104/1/12(D)  Eth105/1/11(D)
                                     Eth105/1/12(D)

The command works for n5k ports but not n2k :

NEX-A# sh run int po201
interface port-channel201
  description SERV-00-01
  switchport access vlan 112
  speed 10000
  vpc 201

NEX-A(config)# int po303
NEX-A(config-if)# vpc 303
ERROR: Operation failed: [vPC already exists]

Here is my show vpc, no vpc 303, but one ID per port and a total of 508 vpc whereas I configured only 2 vpc :

NEX-A# sh vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 5
Peer status                       : peer adjacency formed ok
vPC keep-alive status             : peer is alive
Configuration consistency status  : success
Per-vlan consistency status       : success
Type-2 consistency status         : success
vPC role                          : primary
Number of vPCs configured         : 508
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Enabled (timeout = 240 seconds)

vPC Peer-link status
---------------------------------------------------------------------
id   Port   Status Active vlans
--   ----   ------ --------------------------------------------------
1    Po1    up     8,104,112,208,297-299,490-492,560-572,580,590,2000
                   ,2008,2104

vPC status
----------------------------------------------------------------------------
id     Port        Status Consistency Reason                     Active vlans
------ ----------- ------ ----------- -------------------------- -----------
201    Po201       down*  Not         Consistency Check Not      -
                          Applicable  Performed
102400 Eth101/1/1  down*  Not         Consistency Check Not      -
                          Applicable  Performed
102401 Eth101/1/2  down*  Not         Consistency Check Not      -
                          Applicable  Performed
102402 Eth101/1/3  down*  Not         Consistency Check Not      -

Can you help me ?

[ahmedshoaib]

Hi;

Can you tell the part# of your nexus 5K, either its 5000 or 5500 Series Nexus?

Thanks & Best regards;

[Clement BONNAL]

Hello,

This is N5K-C5672UP with n6000-uk9.7.0.8.N1.1 software.

Regards,

[ahmedshoaib · Accepted solution]

Hi;

You share the output of "show vpc brief" of primary switch, can you verify on secondary N5K switch also may be vPC id 303 is assigned to port-channel.

Thanks & Best regards;

[Furose M · Accepted solution]

There will be an internal port-channel created for enhanced VPC. you dont need to explicitly set a VPC ID. in fact, you cant.

please check the output of "show vpc brief" and you will see the port-channel listed there.

[Clement BONNAL]

Hi,

You're right, here is the output with auto generated ID :

111662 Eth110/1/47 down*  Not         Consistency Check Not      -
                          Applicable  Performed
111663 Eth110/1/48 down*  Not         Consistency Check Not      -
                          Applicable  Performed
262446 Po303       down*  Not         Consistency Check Not      -
                          Applicable  Performed
262454 Po311       down*  Not         Consistency Check Not      -
                          Applicable  Performed
262455 Po312       down*  Not         Consistency Check Not      -
                          Applicable  Performed

It's an error from my part, we need to use vPC ID on Po, when Fex are single homed.

Thank you all.