[j-nsp] juniper cisco switch interconnection

[Patrick Dickey]

Hi Dale- As far as I know, it's a Cisco interop issue. Cisco only sends
certain info to the standard multicast address on VLAN 1. On all other
VLANs, it sends info only to the Cisco multicast address (not the standard
RFC address). At least that's how I remember the problem.... could be wrong.


Patrick

-----Original Message-----
From: dale.shaw at gmail.com [mailto:dale.shaw at gmail.com] On Behalf Of Dale
Shaw
Sent: Monday, December 10, 2012 2:50 PM
To: Patrick Dickey
Cc: Juniper List
Subject: Re: [j-nsp] juniper cisco switch interconnection

Hi Patrick,

On Tue, Dec 11, 2012 at 8:20 AM, Patrick Dickey <dickeypjeep at yahoo.com>
wrote:
> Just a quick note: if you need multiple vlan STP (like what PVST+ 
> has...), use VSTP on the Juniper. Ensure that VLAN 1 is on any trunk 
> line between the Cisco and the Juniper. You don't need to have traffic 
> there, but PVST+ uses VLAN 1 and VSTP will listen on VLAN 1 for STP 
> information. If it's not configured, all kinds of strangeness occurs.

Your comment reminded me of some VSTP "strangeness" I'd seen previously.

Do you know if VSTP "wants" VLAN 1 even in a pure Juniper environment?
Or is this only required for Cisco PVST+ interop?

Cheers,
Dale