when I need to use "switchport stackport" 2950 + GigaStack

[bennith]

Hello,

I have a question about the gigastack module in 2950 and also about the some design consideration.

Now there are two 6509 with MSFC2 as the core switch and router, then the all edge are the 2950. I planned a stack of 2950 (by gigastack) in each floor and with two GBIC uplink(the first and the last 2950 in each floor) to 6509.

The question is : should I use the command "switchport stackport" in all 2950's gigastack port , or only the first and last switch in the stack?

One more question, what is the definition of the these key words? "shr", "p2p". (I get this information when I use the "sh spantree interface" ).

Thank you very much.

Bennith.

[milan.kulik]

Hi,

1) I've never heard about "switchport stackport" command. What IOS are you running?

2) "shr" means a shared port, "p2p" means point-to-point port.

These port type differentiation is important for Rapid STP. (And the status is shown on 2950 even while running PVSTP.)

See http://www.cisco.com/warp/public/473/146.pdf for details.

Regards,

Milan

[bennith]

Hello,

The command are "spanning-tree stack-port". IOS version is 12.1(13)EA1c.

Thanks for your link I would study it.

Thanks,

Bennith.

[milan.kulik · Accepted solution]

OK, I understand now.

My opinion is (but I'm not using this feature in my network) you should enable CSUF on each switch in the stack by "spanning-tree stack-port" in the GigaStack interface configuration. But there is a limit - the only one port per switch can be used (i.e. you have to daisy-chain switches in the stack).

See details in

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/1219ea1/scg/swstpopt.pdf

Regards,

Milan

[bennith]

Thanks your reply. Now I enabled CSUF (command 'spanning-tree stack-port') in all 2950's gigastack port.