I would look to make sure that both connections are up and working. Are the switch
ports in the same VLAN?
If you have two ports connected to the same hub you will create a loop and the switch
SHOULD put one port in blocking. If you do "sho spantree VLAN#" one of the ports
should be blocked.
Your first inline comment states that "WE have a LOOP". If a switch were to ignore
it's own BPDU's that it sees on a different port, then it would be ignoring the fact
that there is a loop in the architecture and break all STP rules. It is the switches
job to detect this and break the loop. I would double check your set up and make sure
things are really connected the way you think.
Please, somebody tell me I am wrong, but it goes against everything I have learned.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 27, 2000 11:09 AM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; Swedberg, Bill (OTSD, IT,
SBC Communications)
Subject: Re: 2 Connections between hub and switch
Bill, thanks for the insight. See comments below..
>
>What you have stated above is not entirely true. Yes a switch does >not
>place traffic back on a port it just received it from, but the >traffic on
>port 1 WILL be placed on port 2 and vice-versa.
Yes. I see your point and I agree. What we have here is a broadcast storm.
>Also, with having 2 connections to a hub, the switch will send BPDU's
> >down port 1 and port 2, BPDU's from port 1 will be returned to the
> >switch on port 2 and BPDU's from 2 returned on port 1. Once the >switch
>sees it's own BPDU's it will kick off STP and if you have >default settings
>on the switch, port 2 will be blocked.
I think the only thing that will put a port into blocking mode is when it
detects a loop with another bridge/switch. I have default settings and the
switch does not block a port, so what you stated-did not happen. But it will
block one when another switch is connected the same way. But, not with a
hub. I think if a switch sees it's own BPDUs it drops or ignores them.
>Your statement about a Hub not sending BPDU's is correct. It is the
> >switch's BPDU's that you need to watch out for.
>
>William Swedberg CCNP CCDP
>SBC DataComm
>(860) 547-3997
>
>
>
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
___________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
