On 8/27/13 8:16 AM, Johan Borch wrote: > This is basically two datacenters with a lot of devices on each side, and I > need to exchange vlans in a redundant way. I need something solid so that > one side can't interfere with the other side. Is there some way to add an > extra L2 device between the networks to act as some kind of spanning tree > "firewall" ;) talking MSTP and RSTP but not changing the root on either > side? > You've arrived at a point where spanning tree may be running out of steam, depending on your choice of platforms you should probably be looking at trill/spb/L2vpn to glue these together. at some pooint you're also going to want to use all your paths rather than blocking some of them to build a loop-free topology. > Regards > Johan > > > On Tue, Aug 27, 2013 at 4:20 PM, Marvin Bartchlett > <mbartchl...@juniper.net>wrote: > >> You will have to be very careful. If I’m not mistaken MST actually uses >> CST to tie together the multiple spanning tree instances running in MST. If >> you tie in a Cisco device running RSTP the Juniper and Cisco devices will >> default to CST on those links since that’s the common ground (as Johan said >> below). >> >> This will trigger a spanning-tree root election on your CST instance - >> depending on how you have things configed you may endup with different >> roots. This could effect the flow of your MST instances that rely on CST. >> >> Best regards, >> Marvin Bartchlett >> Juniper Networks >> Resident Engineer - City of Lakeland, FL >> Mobile: +1-904-614-1712 >> Skype & Google+: mbartchlett >> >> *From:* Ge Moua >> *Sent:* Tuesday, August 27, 2013 9:35 AM >> *To:* Johan Borch >> *Cc:* juniper-nsp@puck.nether.net >> >> This is a juniper forum so I apologize ahead of time for the vendor-C >> reference below (but standards-based L2 works mostly the same across all >> vendor implementations): >> >> https://supportforums.cisco.com/thread/344842 >> >> -- >> Regards, >> Ge Moua >> Univ of Minn Alumnus >> -- >> >> On 08/27/2013 08:16 AM, Johan Borch wrote: >>> Will that mean that I still have two roots, one in each network and >>> that they don't affect each other? >>> Regards >>> Johan >>> >>> >>> On Tue, Aug 27, 2013 at 2:53 PM, Ge Moua <moua0...@umn.edu >>> <mailto:moua0...@umn.edu>> wrote: >>> >>> IIRC once joined, the MST and r-pvst L2 domains will speak CST (as >>> a common denominator). You may want to consider pruning vlans >>> where only needed (esp if you have a high vlan count on either or). >>> >>> -- >>> Regards, >>> Ge Moua >>> Univ of Minn Alumnus >>> -- >>> >>> >>> On 08/27/2013 03:56 AM, Johan Borch wrote: >>> >>> Hi! >>> >>> I need to connect two spanning-tree domains, one is running >>> MSTP and one is >>> running rapid-pvst. Is this doable? The two networks have >>> different roots >>> and it needs to stay like that but I still need redundant >>> links between >>> them. I need to transport VLANs from one network to the other >>> and only one >>> side support MPLS. >>> >>> Ideas? :) >>> >>> Regards >>> Johan >>> _______________________________________________ >>> juniper-nsp mailing list juniper-nsp@puck.nether.net >>> <mailto:juniper-nsp@puck.nether.net> >>> https://puck.nether.net/mailman/listinfo/juniper-nsp >>> >>> >>> _______________________________________________ >>> juniper-nsp mailing list juniper-nsp@puck.nether.net >>> <mailto:juniper-nsp@puck.nether.net> >>> https://puck.nether.net/mailman/listinfo/juniper-nsp >>> >>> >> _______________________________________________ >> juniper-nsp mailing list juniper-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/juniper-nsp >> >> >> > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp >
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