Port-channel error when configuring NX7000 + NX2000

[Rosa Ladeira]

I am working on configuring NX7000 + NX2000.

I am following "Configuring the Cisco Nexus 2000 Series Fabric Extender" manual.

As in manual :

Information About Associating a Fabric Extender to a Fabric Interface

A Cisco Nexus 2000 Series Fabric Extender is connected to its parent device through a port channel. By

default, the parent device does not allow the attached Fabric Extender to connect until it has been assigned a

FEX-number and is associated with the connected interface.

Examples

This example shows how to associate the Fabric Extender to a port channel interface on the parent device:

switch# configure terminal

switch(config)# interface port-channel 4

switch(config-if)# switchport mode fex-fabric

switch(config-if)# fex associate 100

switch(config-if)# exit

switch(config)# interface ethernet 1/37

switch(config-if)# switchport mode fex-fabric

switch(config-if)# fex associate 100

switch(config-if)# channel-group 4

switch(config-if)# exit

switch(config)# interface ethernet 1/38

switch(config-if)# switchport mode fex-fabric

switch(config-if)# fex associate 100

switch(config-if)# channel-group 4

switch(config-if)# exit

switch(config)# interface ethernet 1/39

switch(config-if)# switchport mode fex-fabric

switch(config-if)# fex associate 100

switch(config-if)# channel-group 4

switch(config-if)# exit

switch(config)# interface ethernet 1/40

switch(config-if)# switchport mode fex-fabric

switch(config-if)# fex associate 100

switch(config-if)# channel-group 4

switch(config-if)# exit

Question:

1. Is it mandatory using 4 ethernet ports to configure port-channel ?

2. (if not) Can I use only 2 ethernet ports to configure port-channel ?

3. I have got an error following example. It was necessary cli command "sw" before "switchport mode fex-fabric".

Thanks in advance.

Rosa

[Jerry Ye]

You can use 2 ports. It will increase the oversubcription ratio for devices connected to the N2K.

You need to issue switchport first because the default port configuration on the N7K is no switchport. You can check the default port configuration by using the show run interface x/x all. Here is an example:

Pri-DC-Routing-1# sh run int e1/5 all

!Command: show running-config interface Ethernet1/5 all

!Time: Thu Aug 11 19:41:02 2011

version 5.1(3)

interface Ethernet1/5

  no description

  shutdown

  lacp port-priority 32768

  lacp rate normal

  cdp enable

  no switchport

  speed auto

  duplex auto

  rate-mode shared force

  flowcontrol receive off

  flowcontrol send off

  no link debounce

  no beacon

  mtu 1500

  delay 1

  snmp trap link-status

  logging event port link-status default

  logging event port trunk-status default

  bandwidth 10000000

  no bandwidth inherit

  mdix auto

  storm-control broadcast level 100

  storm-control multicast level 100

  storm-control unicast level 100

  load-interval counter 1 30

  load-interval counter 2 300

  no load-interval counter 3

  no mac-address

  medium broadcast

  service-policy type queuing input default-in-policy

  service-policy type queuing output default-out-policy

HTH,

jerry

[Rosa Ladeira]

Hi Jerry.

As I have a very few number os spfs, I do like to ask (something a litle bit stupid) if is it possible to configure port-channel using just one ethernet port on Nexus 7000.

Thanks in advance.

Rosa

[Jerry Ye · Accepted solution]

Yes, it is possible.

HTH,

jerry

[Rosa Ladeira]

Thanks a lot.

Regards,

Rosa