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.s...@gmail.com [mailto:dale.s...@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 <dickeypj...@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 _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
