From: Subbiah Kannan (kans@xxxxxxxxxxxxxx)
Date: Thu Jul 08 1999 - 18:21:32 GMT-3
Hi
When redistributing between OSPF VLSM route to
RIP/IGRP, it is always adviseable to summarize on
RIP/IGRP network boundaries.
I mean if RIP/IGRP has a class B network with Class B
mask, then summarize OSPF routes also with class B
mask. Otherwise , those routes wont get reflected in
RIP/IGRP routing table.
The idea is summarization should be the same as the
RIP/IGRP net mask boundary.
Kannan.
---alfred zhang <alfredzh@public1.ptt.js.cn> wrote:
>
> hi,
>
> I configured it use "summary-address
138.146.150.0 255.255.255.0" command.I
> found that if the network is the common ospf
network(LAN,F/R),i can use the
> command to redistribute the vlsm route to
rip/igrp.But if the network is the
> ospf demand-circuit network(ISDN,PSTN),the command
would not perform the
> redistribution.At first,the ospf summary route
"138.146.150.0" will show.After
> several seconds,the ospf summary route will
disappear,so the vlsm route would
> not redistribute into rip/igrp.
>
> Ben Rife wrote:
>
> > Alfred,
> >
> > This is the classic FLSM/VLSM problem. You
will (should) become an
> > expert at this before taking the lab. There are
several ways to connect the
> > two routing protocols. For example:
> >
> > Assuming that you have a 24 bit mask for the rip
domain:
> >
> > You could use the "OSPF Router ###" sub-command:
> > summary-address 136.148.150.0 255.255.255.0
> > summary-address 172.16.30.0 255.255.255.0
> > etc...for each subnet in the ospf domain you
want to advertise
> >
> > The routes will be advertised into rip with the
common mask /24. The problem
> > here is that the two "routing domains" use
different subnet masks. You need
> > to use the summary-address command to inject the
/24 bit summary into rip.
> >
> > One important thing to remember is that when you
do mutual redistribution as
> > in this case, you will have routing loops. To
prevent/avoid them, you must
> > use a distribution-list on the rip side. You
could put a dist-list on OSPF,
> > but documentation says that is better to perform
it on the other non-OSPF
> > protocols.
> >
> > Others in the group are experts on this subject
and probably could convey
> > the problem/solution to you better. I hope that I
helped though.
> >
> > Benjy Rife
> > MCSE, CNE, CCIE Candidate
> > brife@bignet.net
> > www.bignet.net/~brife
> >
> > ----- Original Message -----
> > From: zhang min <alfredzh@public1.ptt.js.cn>
> > To: <ccielab@groupstudy.com>
> > Sent: Sunday, July 04, 1999 8:55 PM
> > Subject: redistribute vlsm route to rip/igrp
> >
> > > hi guys,
> > >
> > > can anybody tell me how to redistribute VLSM
route to rip/igrp?For
> > > example,router A connects ospf 1 and rip
area.In ospf 1,there are
> > > several VLSM route,136.148.150.4/30,how to
redistribute it into rip?
> > >
> > > alfred
> > >
> > >
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