Thanks for your replies. The Scenario specifically requested that the Spokes will be running OSPF with the HUB and have each different ip Next Hops to R1 (the HUB). That's why the p2p subinterfaces seems to be the solution.
Apparently, when there are two FR subinterfaces running on the same physical interface and sharing the ip subnet, only one of the P2P links will TX/RX ICMP messages. This is when NO routing protocols have been installed. For example, if you shut down the p2p interface that is TX/RX ICMP's, automatically the other will start TX/RX ICMP's. Apparently this is the normal behavior of routers (at least running 12.3) As soon as OSPF is configured for the two P2P links, ICMP messages work great for both pipes. Bridging and Virtual-Template interface solution will not fulfill the requirements for this scenario as they will make the two P2P subinterfaces share the SAME IP ADDRESS and this cannot be. They Must share the subnet but have different ip addresses so the spokes will have different next-hop addresses from each one. Thanks! --- kirsch <[EMAIL PROTECTED]> wrote: > I have a question regarding the typical hub and > spoke fram relay > configuration. In the Lab that I am currently > working on, it was > required to configure the HUB router with one > PHYSICAL and two LOGICAL > (Point to Point) frame-relay links on the Same > interface. > In other words, there is S0/0-> R3, S0/0.2->R2 and > S0/0.4->R4. > Now, the catch is that both subinterfaces MUST > belong to the same ip > subnet. I was able to configure all ip's, pvc's, etc > but I noticed that > for some reason, either of the spokes cannot ping > the HUB even though > the FR PVC is up and even OSPF adjacencies are being > created between the > routers. Also, both spoke routers can ping each > other (going through the > HUB). So my question is: Why can't I ping from > either spoke routers to > the HUB but I CAN ping between the spokes and OSPF > adjecencies are being > formed between the Spokes and Hub? Is there a > problem with ICMP protocol > in this setting? Can anybody point me to the right > direction? The > relevant config is pasted below: > > I might suggest two solutions to the problems > *** the kicker here is the same subnet for both > sub-interfaces. This > can't be done with one of two solutions below. > > 1. Use virtual interface on the hub router (this > automatically creates > virtual-access interface) > Ex: > Int virtual-template 1 > Ip address (use the IP for both S0/0.2 and S0/0.4) > ! > Int s0/0.2 and 0/0.4 (point-to-point or > multipoint) > R3(config-subif)#frame-relay interface-dlci xxx ppp > virtual-Template 1 > (can use broadcast keyword at the end) > > OR > > 2. Bridging on hub router > > Bridge irb > ! > Bridge 1 protocol ieee > Bridge 1 route ip > ! > Interface s0/0.2 (and same for s0/0.4) > > frame-relay map bridge xxx (can use broadcast > keyword at the end) > > > > ____________________________________________________________________________________ Finding fabulous fares is fun. Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains. http://farechase.yahoo.com/promo-generic-14795097
