From: Edwards, Andrew M (andrew.m.edwards@boeing.com)
Date: Mon Apr 12 2004 - 18:39:56 GMT-3
Serran ,
Where I have seen this, and why I asked, was during RIP redistribution.
You get the host address route for adjacency / neighbor relationships on
overlapping major networks. Causes things like flapping ISDN links even
with setting up ip ospf demand circuit.
Example,
R1 is ISDN to R2 and frame relay to R2. ISDN and FR are in OSPF area 0.
ISDN link has ip ospf demand circuit on it. ISDN IP address 20.20.20.1
/ 24. R1 serial point to point is 20.20.21.1 /24.
Required to redistribute RIP into OSPF for full reachability. When you
do this the ISDN link comes up until the timer expires, then goes down
and comes up again... Up/down/up/down... Etc. If you look at the OSPF
database you see the /32 address for the ISDN link. It goes down and
the BRI goes down with demand circuit and DNA set. But when the RIP
update occurs, you have a topology change to the /32 address during
redistribution of RIP because it overlaps the same major network. So
you either filter the /32 address from RIP into OSPF, change major
networks on ISDN link, or go to the BRI interface and use "no peer
neighbor-route" command to not maintain the neighbor peer for RIP that
gets redistributed into OSPF and causes link flap.
Oh yes, the ip summary rip command is apparently only rip v2 valid.
Follow the link I sent back last time.
andy
-----Original Message-----
From: Serran [mailto:groupstudy@swiftdsl.com.au]
Sent: Monday, April 12, 2004 12:26 PM
To: Scott Morris; ccielab@groupstudy.com
Subject: RE: removing /32 bit routes
hi Scott,
I think this is a related issue.. can you explain this further..
based on the classfulness of ripv1, i do not understand how a /32 can
show up for a ptp serial link when the link is eg. set at a /27. The
/32 is an IP of one end of the serial /27 link. I can produce results
where the /27 serial link does not propogate (even if /27 is consistant
throughout the rip v1 domain), and the /32 ends up being advertised
instead.
the things is.. i would expect both sides of the serial to advertise a
/32 throughout the rip domain, however, only 1 /32 is ever advertised.
having said that the /32 that is not advertised throughout, is visible
on the router on the other side of the serial ppp link.
there isn't much info I have search on that explains this. I am
thinking this is virtual-access specific and not ripv1 specific.
regards
Serran
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Scott Morris
Sent: Saturday, 10 April 2004 3:05 AM
To: 'Edwards, Andrew M'; ccielab@groupstudy.com
Subject: RE: removing /32 bit routes
Run version 1?
;)
Where are the coming from, and why do you want to remove them? How
about a summary address? (ip summary-address rip)
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
CISSP, JNCIS, et al. IPExpert CCIE Program Manager IPExpert Sr.
Technical Instructor swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Edwards, Andrew M
Sent: Friday, April 09, 2004 11:51 AM
To: ccielab@groupstudy.com
Subject: Re: removing /32 bit routes
Can someone tell me how to remove /32 bit routes when you are running
RIP?
Andy
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