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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!unixhub!unixjr.SLAC.Stanford.EDU!kls
- From: kls@unixjr.SLAC.Stanford.EDU (Karl L. Swartz)
- Newsgroups: comp.dcom.sys.cisco
- Subject: split horizon with redistributed routes
- Message-ID: <5334@unixhub.SLAC.Stanford.EDU>
- Date: 27 Aug 92 07:21:38 GMT
- Sender: news@unixhub.SLAC.Stanford.EDU
- Organization: Stanford Linear Accelerator Center
- Lines: 33
- Nntp-Posting-Host: unixjr.slac.stanford.edu
-
- I have a network with several ciscos on it:
-
- | | |
- +---- R1 ----+ |
- | +---- R2 ----+
- | | |
-
- net A net B net C
-
- The routers speak IGRP amongst themselves, and redistribute IGRP into
- RIP for the benefit of hosts which don't understand anything else.
- (The network is actually rather more complicated; I'm simplifying to
- illustrate the problem.) Another router on net A is a gateway to the
- Internet, which R1 and R2 learn about via IGRP and then redistribute
- to RIP as default routes.
-
- The problem is that R2 advertises a default route on net B, and then
- sends redirects to anybody who uses it. I understand that the usual
- split horizon rules don't apply here since R2 learned the route via
- net B but not from the same protocol, but I'd like to apply split
- horizon just the same. That is, if R2 learned a route (default in
- this example, but it holds for any route) via net B, I don't want it
- to advertise it on net B. Period.
-
- Can I do this? Static filters aren't acceptable, and I can't just run
- RIP because the networks are not homogenous and I want the routers to
- use the "best" route available.
-
- --
- Karl Swartz |INet kls@unixhub.slac.stanford.edu
- SLAC Computing Services | or kls@ditka.chicago.com
- 1-415/926-3630 |UUCP uunet!lll-winken!unixhub!kls -or- ditka!kls
- (SLAC and the US Dept. of Energy don't necessarily agree with my opinions.)
-