Frank, Fallback bridging is for non-IP traffic. R8 and R9 are on the same subnet...that would be bridging IP between VLANs. You can test with IPX, do something like this on both routers:
ipx routing int f0/1 ipx network 100 ipx encapsulation snap Then ping R8 and R9 via IPX addresses (do show ipx interface to see the full address). On Thu, Mar 25, 2010 at 8:13 AM, Frank <[email protected]> wrote: > > Hi, > > Since I did not know what "fallback bridging" was, I looked it up on the > web. Unfortunately, the more I look, the less I seem to grasp it. > What I understand is that it can be used to bridge NON IP packets > between VLANs on a switch. > What I do not understand is how this would work "spanning-tree" wise. > Some literature seems to refer to a "VLAN spanning tree protocol" which > would be something different from the standard IEEE spanning-tree > protocol. Never heard of that. Is this correct, and what would be the > fundamental differences? > > Second, to understand this technology better, I started a little > experiment. I did this on cat4: > > bridge irb > bridge 3 protocol vlan-bridge > bridge 3 route ip > > interface Vlan2200 > no ip address > bridge-group 3 > ! > interface Vlan2300 > no ip address > bridge-group 3 > ! > interface BVI3 > ip address 150.100.81.4 255.255.255.0 > ! > > Also I gave R8 and R9 IP addresses: 150.100.81.8 and 150.100.81.9. > Then I tried to see if I could ping R8, R9 and CAT4; but none of it worked. > > I assumed that by routing IP on the bridge that R8 and R9 would be able > to see each other; but they are not even able to ping the switch BVI > address. > > Should this work or not? > > Regards, > > Frank > > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > -- Bryan Bartik CCIE #23707 (R&S, SP), CCNP Sr. Support Engineer - IPexpert, Inc. URL: http://www.IPexpert.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
