evan@sabine.rice.EDU (Evan Wetstone) (10/04/89)
We've got a ProNet-10 ring with a number of p4200's attached. The p4200's have one or two Ethernet interfaces as well. I am considering some network redesign, and have come across a routing question. Given a p4200 router (using RIP as its routing protocol) that has two paths to a given network address, with identical hop counts, how does the p4200 route traffic to that network? Does it do load balancing? Will it fixate on one path and keep using it until it gets a better path? Will it use the last path it hears about and flip back and forth? Now, let's assume that one path is the politically preferred path, but I want to use the other when the first path is unavailable. How do I go about it? | | B | | +---+ +---+ / |---| 1 |------------| 2 |-------/ | +---+ +---+ / A| | | | ProNet-10 Ring | +---+ \ |--------------------| 3 |-------\ | +---+ \ | Assuming network B is the source and network A is the destination, gateway 2 has two paths to A, with identical hop counts. Which path does it take? Let's say I want to use gateway 3 as the preferred path. How do I do it? Likewise, assume A as the source and B the destination. The same questions apply. Thanks in advance for any info. ---- Evan R. Wetstone Internet: evan@rice.edu Network and Systems Support BITNET: evan@ricevm1 Rice University, Houston TX
jch@CHUMLEY.TN.CORNELL.EDU (Jeffrey C Honig) (10/04/89)
RIP does not support equal cost paths, the first one learned at a given metric will be used until it is lost, or a path with a higher metric is learned. Currently there is no direct way to specify an administratively prefered path. You might be able to do something with static routes. Jeff