This brings to mind a question for the group:
Will Cisco's 802.1Q implementation support per-VLAN STP?
Cheers,
Lance
>From: "Chris H" <[EMAIL PROTECTED]>
>Reply-To: "Chris H" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED], [EMAIL PROTECTED]
>Subject: Re: Cisco to 3Com Dot1Q trunks and VLANs
>Date: Mon, 15 Jan 2001 19:41:55 -0000
>
>Michale,
>
>I have dot1q trunks running across Cisco MDF switches and Nortel IDF
>switches. We found that Cisco and Nortel run two different versions of
>Spanning Tree, both of which are 802.1q compliant. The difference between
>the two is that Cisco's portfast feature, and Nortel's faststart feature
>are
>different, where portfast has a default forward delay of 15 seconds, and
>faststart doesn't implement the forward delay feature.
>
>This resulted in a huge amount of TCN's (topology change notifications),
>particularly in the morning, when all end users are booting up their pc's
>and changing to 'forwarding' mode in spanning tree. As a result, we opened
>a ticket with Nortel, and they agreed to add forward delay to their
>switching code to correct this problem.
>
>I would check the STP documentation on both vendors, and determine if all
>the default values are the same, what the default root bridge priority
>number is with both vendors, who you have configured as your root bridge,
>etc. I would even plug a sniffer in and capture some traffic... Draw out a
>spanning tree diagram, and document your root bridge, and the subsequent
>switches in the spanning tree. Those are just some suggestions... Hope you
>find some results.
>
>Chris
>
>
> >From: [EMAIL PROTECTED]
> >Reply-To: [EMAIL PROTECTED]
> >To: [EMAIL PROTECTED]
> >Subject: Cisco to 3Com Dot1Q trunks and VLANs
> >Date: Thu, 11 Jan 2001 13:02:56 -0600
> >
> >I have the opportunity to create this cross platform network and am
>looking
> >for
> >information other than the standard documentation from Cisco and 3Com to
> >accomplish this task. The dot1Q trunks appear to be functioning
>correctly
> >between the Cisco 6509 and the 3Com 3300, but the VLANs are not
>performing
> >optimally. Any helpful information or pointers to sites with information
> >would
> >be greatly appreciated.
> >
> >Mike
> >
> >
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