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Community Member

Port Channel in Nexus

Hi All,

I have a scenario where I have two nexus 5596 as upstream and have vPC  in between. downstream is the server hooking to the upstrean both nexus  devices.

On Both the Nexus switch the port channel is down and the VPC is also  down. The physical interfaces are up and passing traffic to the server.

My understanding is if the server NIC's are teamed, even the switches should also have the portchannle to work properly.

But since portchannel and vpc both are down in both the switches

1. how the switch is passing traffic.
2. I checked the configs for portchannel formation on phy ports which looks good to me still po is down. Why?
3. I understand as port channel is down so vPC is down ( correct me if I am wrong).

I have attached the diagram & below are the logs for ur reference:

The output on Nexus5596 2 device is same as on Nexus5596 1

Nexus5596 1#Sh vpc

Legend:

                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                   : 106

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       : 29

Peer Gateway                    : Disabled

Dual-active excluded VLANs      : -

Graceful Consistency Check      : Enabled

vPC Peer-link status

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

id   Port   Status Active vlans

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

1    Po4    up     1-2,713-718,999

vPC status

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

id     Port        Status Consistency Reason                     Active vlans

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

9      Po9         up     success     success                    2,713-718

701    Po701       down*  success     success                    -

702    Po702       down*  success     success                    -

Nexus5596 1# sh port-channel su

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

Group Port-       Type     Protocol  Member Ports

      Channel

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

4     Po4(SU)     Eth      LACP      Eth1/27(P)   Eth1/28(P)

9     Po9(SU)     Eth      LACP      Eth1/29(P)   Eth1/30(P)   Eth1/31(P)

                                                    Eth1/32(P)

701   Po701(SD)   Eth      LACP      Eth1/1(I)

702   Po702(SD)   Eth      LACP      Eth1/2(I)

Nexus5596 1#sh run int e1/1

interface Ethernet1/1

  description snrkdc1285_1/0

  switchport mode trunk

  switchport trunk native vlan 713

  switchport trunk allowed vlan 713-718

  spanning-tree port type edge trunk

  no snmp trap link-status

  channel-group 701 mode active

Nexus5596 1# sh int e1/1 status

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

Port          Name               Status    Vlan      Duplex  Speed   Type

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

Eth1/1        snrkdc1285_1/0     connected trunk     full    10G     10Gbase-SR

Thanks,

Sagar

4 REPLIES
VIP Super Bronze

Port Channel in Nexus

Hi,

According to your diagram, Portchannel 701 should have port e1/0 in it in each of the 5500 switches, but below output shows port e1/1

Can you post the portchannle configs or sh run from both switches?

701 Po701(SD) Eth LACP Eth1/1(I)

702 Po702(SD) Eth LACP Eth1/2(I)

HTH

Purple

Re: Port Channel in Nexus

  Is the port channel SVI admin up  ?  Can you post a show running int port-channel 702  ?  Does a sow ip int brief show the SVI as admin up ?

Community Member

Port Channel in Nexus

Reza - My bad I mistakenly mentioned e1/10 in diagram but it is e1/1 for po701

Since these are L2 switches SH IP INT BR shows only mgmt Ip

Please find the requested outputs as below.

nexus5596 1#sh run int po701

interface port-channel701

  description snrkdc1285

  switchport mode trunk

  switchport trunk native vlan 713

  switchport trunk allowed vlan 713-718

  spanning-tree port type edge trunk

  speed 10000

  no snmp trap link-status

  vpc 701

nexus5596 2# sh run int po701

interface port-channel701

  description snrkdc1285

  switchport mode trunk

  switchport trunk native vlan 713

  switchport trunk allowed vlan 713-718

  spanning-tree port type edge trunk

  speed 10000

  no snmp trap link-status

  vpc 701

nexus5596 1#sh int br

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

Ethernet      VLAN    Type Mode   Status  Reason                   Speed     Port

Interface                                                                    Ch #

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

Eth1/1        713     eth  trunk  up      none                        10G(D) --

Eth1/2        713     eth  trunk  up      none                        10G(D) --

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

Port-channel VLAN    Type Mode   Status  Reason                    Speed   Protocol

Interface

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

Po4          1       eth  trunk  up      none                       a-10G(D)  lacp

Po9          2       eth  trunk  up      none                       a-10G(D)  lacp

Po701        713     eth  trunk  down    No operational members       10G(D)  lacp

Po702        713     eth  trunk  down    No operational members       10G(D)  lacp

nexus5596 2#sh int br

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

Ethernet      VLAN    Type Mode   Status  Reason                   Speed     Port

Interface                                                                    Ch #

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

Eth1/1        713     eth  trunk  up      none                        10G(D) --

Eth1/2        713     eth  trunk  up      none                        10G(D) --

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

Port-channel VLAN    Type Mode   Status  Reason                    Speed   Protocol

Interface

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

Po4          1       eth  trunk  up      none                       a-10G(D)  lacp

Po9          2       eth  trunk  up      none                       a-10G(D)  lacp

Po701        713     eth  trunk  down    No operational members       10G(D)  lacp

Po702        713     eth  trunk  down    No operational members       10G(D)  lacp

Community Member

Re: Port Channel in Nexus

Are you sure the server is configured for a LACP port channel and not just for nic teaming? I think the (i) status indicates you are not getting LACP from the server.

Tom

Sent from Cisco Technical Support iPhone App

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