• November 27, 2020, 05:45:17 AM
Welcome, Guest. Please login or register. Registration is free.
Did you miss your activation email?

Author Topic: Adding BPDU to an active MLT?  (Read 2536 times)

0 Members and 1 Guest are viewing this topic.

Offline Romeyn

  • Rookie
  • **
  • Posts: 19
    • http://linkedin.com/in/romeynprescott
Adding BPDU to an active MLT?
« on: April 08, 2014, 11:07:42 AM »
I apologize if this is a FAQ and/or covered elsewhere already.

I've been reading about the importance of enabling BPDU on all ports in a MLT.

Is it possible to do so without disabling the MLT?

We neglected to do this on a recent upgrade in our main datacenter, and don't want to bring down the whole facility to accomplish this!  Though it may be unavoidable, as we are experiencing some minor issues which may be attributable to not having BPDU enabled.


Offline Théo

  • Jr. Member
  • **
  • Posts: 34
Re: Adding BPDU to an active MLT?
« Reply #1 on: April 18, 2014, 04:08:29 AM »
Hi Romeyn,

What do you mean by "enabling BPDU" ? do you speak about Spanning-tree state on you MLT ?

regards,

Théo
ACIS 6103 - ACSS 3605

Offline Romeyn

  • Rookie
  • **
  • Posts: 19
    • http://linkedin.com/in/romeynprescott
Re: Adding BPDU to an active MLT?
« Reply #2 on: April 18, 2014, 08:14:19 AM »
Hi.  We have a 3-switch stack of 4850GTS-PWR+ switches.  This replaces a stack of Nortel 5510s.  We have a 6-port multilink trunk which includes 1/47-48, 2/47-48, and 3/47-48, only three ports of which are lit/connected.  We had originally connected port 48 on each switch as members of the MLT.  This was functional, but there were errors all over the logs.  Then we found a link here (McNamara, the Nortel god) stating that BPDU frames only get sent on a single link of an MLT--the lowest numbered port:

http://blog.michaelfmcnamara.com/2011/06/avayas-multilink-trunk-and-spanning-tree-protocol/

So I moved the three active ports to port 47 on each switch and made sure that 1/47 was the lowest of the three MLT ports on the other end and the errors went away. 

In that same blog post he lists the steps for MLT creation, including the step 'mlt 1 bpdu all-ports', AFTER which the MLT is enabled.

We did not include this step in the creation of this MLT.  My question is, does the MLT need to be disabled in order to execute the 'bpdu all-ports' command, or can it be done while the MLT is active?  This stack feeds our main data center.  I can't exactly "experiment" on it, nor can I casually just bring it down.

Oh...and to answer your question: Yes, STG is active on all ports.

Thanks for the response!
« Last Edit: April 18, 2014, 08:21:01 AM by Romeyn »

Offline david.foy

  • Rookie
  • **
  • Posts: 3
Re: Adding BPDU to an active MLT?
« Reply #3 on: May 08, 2014, 11:58:34 AM »
this is what I got when I tried it in lab...