Nexus 2248 Etherchannel Trunk

[jagunn]

We are peparing to deploy a Nexus environment in our data center.  We will be using a pair of  2248T FEX's connected to a pair of 5020's.  Each of the 2248T's will be connected to only one of the 5020's.  (Single Homed).  The 5020's will be vPC peers.  I want to confirm that we can do an etherchannel trunk on the 2248T ports.

We have some legacy 1G ESX servers ( 4 x 1G ports)  that we want to connect to the 2248T's,  2 ports to 1 2248 and 2 ports to other 2248. Documentation indicates we that on 2248T that we can bind all 4 of these ports in a single Etherchannel (using vPC)  but we aren't sure whether  this Etherchannel also be a trunk?

Thanks,

[Lucien Avramov]

Yes you can have it as a trunk

[rodrigo.hernandez]

Hi Lucien

In the same way, I have two questions.

If I want to do a etherchannel trunk toward Nexus 2248T, in the host ports, is possible that? I trying to do that in a Conection from Blade with Cisco Switch toward the Nexus 2248T, port e100/1/10 -11.

The last question. How can avoid the blocking in the ports of Nexus 2248T.The host ports are set with BPDUGUARD.

Best Regards

[Lucien Avramov]

Hi Rodrigo,

1) Yes you can

2) Use the command under the port configuration: spanning-tree bpdufilter enable. Be careful when you do so, your FEX port will filter the BPDU and therefore remain up, you need to make sure you don't create a loop in your network.

[rodrigo.hernandez]

OK Lucien.

In the same way. Suppose that we have a Switch, connected toward two Nexus 2248T. Both upliks are port-channel, connected to the host port.

Is possible to do this, but .. is a best practice?

Best Regards

[Lucien Avramov]

Connecting a switch to two different FEX will create a loop since both links will go to two different fexes and STP will not be blocking one of the links.

[ppalmerjr]

Am I understanding correctly?

Wouldn't it be possible to connect the 3750 (as shown below) and vpc it through the fexes?  This shouldn't cause a STP issue, right?

Thanks,

               5020#1 ---vpc--  5020#2

                        \            /

                      fex1       fex2

                           \        /

                            3750

Thanks

[Surya ARBY]

Yes it should work but you will have to enable bpdufiltering on your port-channel. Otherwise you can use the flexlink feature on the 3750.