dell vrtx switch port channel to cisco fex 2248

[Dragomir]

i have a dell vrtx chassis built in 8 port switch that i have cabled 4 ports to a cisco fex tp.

on the 4 ports on the vrtx switch i have it like this

interface gigabitethernet0/1

shutdown

spanning-tree disable

channel-group 1 mode auto

!

interface gigabitethernet0/2

shutdown

spanning-tree disable

channel-group 1 mode auto

!

interface gigabitethernet0/3

shutdown

spanning-tree disable

channel-group 1 mode auto

!

interface gigabitethernet0/4

shutdown

spanning-tree disable

channel-group 1 mode auto

!

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

how do i configure the cisco side of the port channel?

right now the port config is

interface Ethernet101/1/19

  switchport access vlan 50

  spanning-tree port-priority 128

  spanning-tree port type edge

  no shutdown

interface Ethernet101/1/21

  switchport access vlan 50

  spanning-tree port type edge

interface Ethernet101/1/22

  switchport access vlan 50

  spanning-tree port type edge

  no shutdown

interface Ethernet101/1/24

  switchport access vlan 50

  spanning-tree port type edge

  no shutdown

the fex is connect via port channel o a nexus 7k

[Reza Sharifi]

Not familiar with Dell switches, but it appears that you are connecting a switch to a FEX.  FEX ports are designed to be connected to end devices such as servers, workstations, printers, etc.. and not to other switches.  So, I see two options.  1-Don't use the Dell switch and directly connect the servers to the FEX  2-Connect the Dell switch directly to the 7ks using VPC.

HTH

[nkarpysh]

Hello,

"The Cisco Nexus 2148T fabric extender does not support EtherChannels on its host interfaces. Therefore a maximum of two links can be configured in an EtherChannel from the server where each link is connected to a separate Fabric Extender. " (c)

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5500/sw/interfaces/6x/b_5500_Interfaces_Config_Guide_Release_602N12_chapter_0100.pdf

The other thing is STP. If you need to SPAN STP down through the Dell switch you can also create a L2 loop easily. So this should be very carefully considered.

I would vote for Reza's suggestion of connecting Dell switch directly to N7k.

Niko

[Dragomir]

hi

do you mean that the fex 2148 will not support any etherchannels from other switches?

[nkarpysh]

Hello,

On host interfaces it does not.

Niko

[Dragomir]

i heard you can connect a switch the the fex 2248 but need to use fex links. Is that true?

how do you configure this?

[Dragomir]

How do I configure the nexus 7k to attach the dell switch module to it? I don't want to cause a stp loop