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New Member

Nexus 5k - LACP configuration

Here is the scenario that we have:

We have two 5K nexus switches (A and B) with several 2K fex switches (blades). These two switches have a VPC connections between the two of them.

We have a server that has 4 ethernet connections,  NIC 1 and 2 going to 5K-A, NIC 3 and 4 going to 5K-B. This server is a DELL R710 with broadcom NICs configured in teams with LACP. NIC 1 and 3 are teamed together and NIC 2 and 4 are teamed together.

The VPC links are not coming up as you can see below and the servers are not able to talk to anything on the network when their NICs are teamed.

We have basically the same configuration at another site that is working, the only real difference is that at the site that is working we have 7K nexus core switches while at the site that is not working we are using 6500 series switches. Anyone have any ideas? Is the problem something to do with the fact that we don't have 7K core switches? Any info is much appreciated.

5K-B

interface port-channel1001
  vpc 1001
  switchport access vlan 788
  spanning-tree port type edge

interface port-channel1002

   vpc 1002

  switchport access vlan 788

  spanning-tree port type edge

interface Ethernet104/1/25
  switchport access vlan 788
  channel-group 1001 mode active

interface Ethernet104/1/26

  switchport access vlan 788

  channel-group 1002 mode active

5K-A

interface port-channel1001

  vpc 1001
  switchport access vlan 788
  spanning-tree port type edge

interface port-channel1002

  vpc 1002
  switchport access vlan 788
  spanning-tree port type edge

interface Ethernet105/1/25

  switchport access vlan 788
  channel-group 1001 mode active

interface Ethernet105/1/26

  switchport access vlan 788
  channel-group 1002 mode active

show VPC:
Legend:
(*) - local vPC is down, forwarding via vPC peer-link

vPC domain id : 998
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status: success
Type-2 consistency status : success
vPC role : secondary
Number of vPCs configured : 4
Peer Gateway : Disabled
Dual-active excluded VLANs : -

vPC Peer-link status
---------------------------------------------------------------------
id Port Status Active vlans
-- ---- ------ --------------------------------------------------
1 Po10 up 3

vPC status
----------------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
------ ----------- ------ ----------- -------------------------- -----------
1001 Po1001 down success success -
1002 Po1002 down success success -
1003 Po1003 down* success success -
1004 Po1004 down* success success -

  • LAN Switching and Routing
2 REPLIES
Cisco Employee

Nexus 5k - LACP configuration

Can I see the peer-link, FEX configuration and the following command?

show vlan brief | i active

I think I know the problem but want to check the peer-link configuration and VLAN database first.

Regards,

jerry

New Member

Nexus 5k - LACP configuration

I think you were along the right route Jeye, I opened a Cisco TAC case on this and we found the problem to be that the VLAN on these access ports was not being trunked accross the vpc trunk between the two 5K switches. Once we added the vlan into the allowed vlans accross that trunk everything worked fine! Thanks for your response.

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