From: Nabil Bukhari (nabil_bukhari@xxxxxxxxxxx)
Date: Mon Oct 08 2001 - 16:23:43 GMT-3
that sure is interesting
could pls tell me of some nice resource where i coudl get info regarding all
these variuos flavours of STP and someting regarding their interoprebility ?
thanx in advance
nabil
<br><br><br>Syed Nabeel A. Bukhari
Manager Networking Div.
Corvit Systems
14 D I Ghalib Rd. Gulberg III
Lahore
voice: 92-42-5751614,5762401-3
mobile: 92-300-8475109
fax: 92-42-5758353
email: nabil_bukhari@hotmail.com
>From: "Joseph Ezerski" <jezerski@broadcom.com>
>Reply-To: "Joseph Ezerski" <jezerski@broadcom.com>
>To: "'Brant Stevens'" <branto@myrealbox.com>, "'Nabil Bukhari'"
><nabil_bukhari@hotmail.com>, ccielab@groupstudy.com
>Subject: RE: question regarding support for per VLAN STP in cat 6500
>Date: Fri, 5 Oct 2001 17:12:18 -0700
>
>Good post. We are in the process of migrating to MISTP in our switched
>environment. We have about 50+ VLANS and only about 2-3 different
>topologies.
>
>-Joe
>
>-----Original Message-----
>From: Brant Stevens [mailto:branto@myrealbox.com]
>Sent: Friday, October 05, 2001 1:36 PM
>To: Joseph Ezerski; 'Nabil Bukhari'; ccielab@groupstudy.com
>Subject: RE: question regarding support for per VLAN STP in cat 6500
>
>
>I believe as of version 5.5.x, it supported 2 other STP modes, MISTP+, and
>MISTP-PVST+... I haven't done much reading on the latter, but the former
>is
>pretty simple... When using 802.1q, you can have VLANs with the same
>topology use the same instance of STP to eliminate loops, as opposed to
>having a separate STP instance for each VLAN.
>
>Given the topology below:
>
>+-----+ +-----+
>| | | |
>| SWa |-----| SWb |
>| | | |
>+-----+ +-----+
> | |
> \ /
> \ /
> +-----+
> | |
> | |
> | SWc |
> | |
> +-----+
>
>(ASCII Art is a real pain in the ass... have you seen some of the web
>pages
>out there with ASCII Art?!?!?! geez... anyway, I digress...)
>
>If there were 15 VLANs on the above network, numbered 1-15, and SWa was the
>root for VLANs 1,3,5,7,9,11,13, and 15 while SWb was the STP root for VLANs
>2,4,6,8,10,12, and 14, and all these VLANs had active ports on SWc, when
>using PVST+, the Catalyst would create a separate instance of STP for all
>these VLANs, when logically the odd VLANs have the same topology, as do all
>the even VLANs.
>
>In the above scenario, MISTP+ would create 2 instances of STP, one for the
>even VLANs, and one for the odd VLANs.
>
>I don't know the impact this has on switch CPU resources and memory, but it
>seems that in an environment with many VLANs this could prove very
>useful...
>
>HTH,
>Brant.
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Joseph Ezerski
>Sent: Wednesday, October 03, 2001 7:22 PM
>To: 'Nabil Bukhari'; ccielab@groupstudy.com
>Subject: RE: question regarding support for per VLAN STP in cat 6500
>
>
>Yes, of course..the 6509 can do just about anything except tell you about
>the one day lab ;)
>
>In reality, it has supported that for a long time. If you use ISL, you
>automatically get PVST. If you chose to use 802.1q trunking (my choice)
>then you automatically get PVST+ which really just tunnels PVST across a
>dot1q trunk. I do not know in which particular version they first
>supported
>this, but I would venture to say that anything above 5.1 should suffice.
>You may want to check CCO if you are in doubt.
>
>-Joe
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>Nabil Bukhari
>Sent: Wednesday, October 03, 2001 3:48 PM
>To: ccielab@groupstudy.com
>Subject: question regarding support for per VLAN STP in cat 6500
>
>
>hello guys
>coudl someone tell me if some software release supports usage of per VLAN
>STP on cisco cat 6500
>thanx in advance
>nabil
>
This archive was generated by hypermail 2.1.4 : Thu Jun 20 2002 - 22:33:15 GMT-3