Nexus 1000v lacp "mode active"

[Sebastian Helmer]

Dear all,

today I installed my Lab new with ESXI 4.1 and the newest NX release. Everything fine.

But for my systemuplink I would like to use 2 Ports. I tried to configure a channel with "mode active" on all sites. This was not working only "mode on" was working. The Channel is configured in the "system-uplink" Portgroup. I use a 2960-8 Switch on the other side

Any Ideas?

I found a later discussion but without any solution...

thanks in advance

regards,

Sebastian

[vemmadi]

Hi Sebastian,

Can you copy/paste the configuration for :

    o 2960-8 Switch ports (member and Port Channel interface)

    o N1K port profile used for the VEM system uplinks ?

How many system links have been configured to be part of an LACP channel ?

Thanks,

Vishnu

[Sebastian Helmer]

Hi Vishnu,

here my config (currently like I told no LACP "mode on"):

SWITCH

interface GigabitEthernet0/2
switchport mode trunk
channel-group 1 mode on

interface GigabitEthernet0/4
switchport mode trunk
channel-group 1 mode on

interface Port-channel1
switchport mode trunk

2960-LAB-1#sh int trunk

Port        Mode         Encapsulation  Status        Native vlan
Po1         on           802.1q         trunking      1

Port        Vlans allowed on trunk
Po1         1-4094

Port        Vlans allowed and active in management domain
Po1         1-3,6-7,17-18,20,40,243

Port        Vlans in spanning tree forwarding state and not pruned
Po1         1-3,6-7,17-18,20,40,243

Nexus Portchannel, still in "mode active", but seem to work with Switch in "mode on"

Nexus-1# sh port-profile name system-uplink
port-profile system-uplink
  description:
  type: ethernet
  status: enabled
  capability l3control: no
  pinning control-vlan: -
  pinning packet-vlan: -
  system vlans: 6,243
  port-group: system-uplink
  max ports: -
  inherit:
  config attributes:
    switchport mode trunk
    switchport trunk allowed vlan 1-40,243
    channel-group auto mode active
    no shutdown
  evaluated config attributes:
    switchport mode trunk
    switchport trunk allowed vlan 1-40,243
    channel-group auto mode active
    no shutdown
  assigned interfaces:
    port-channel1
    Ethernet3/1 (member of port-channel1)
    Ethernet3/3 (member of port-channel1)
Nexus-1#

[vemmadi · Accepted solution]

Hi Sebastian,

If you are configuring LACP on uplinks carrying system VLANs, please make sure to configure the following on the upstream switch.

On the Upstream Port Channel Interface (Po1):

spanning-tree portfast trunk

On the Member ports of the Upstream Port Channel Interface: (Gig0/2, Gig0/4)

spanning-tree portfast trunk

Once you make the above configuration changes, please change the mode to "active" on the member ports of the Upstream switch.

channel-group 1 mode active

After making the above configuration changes, the portchannel should come up on both the N1K as well as the Upstream switch.

Please verify with the show port-channel summary(N1K) and show etherchannel 1 summary on Upstream.

Please let me know if you have more questions.

Thanks,

Vishnu

[Sebastian Helmer]

Thanks Vishnu

That was the key...

Always a pleasure to work with the cisco guys here

have a nice time

- Sebastian