RIP v1 and v2 send updates periodically, whether there is anything new to
report or not. ( So does IGRP, for that matter ) It is the update that
serves as a functional "hello" Lack of receipt of an update is cause for
concern, and lack of several can start the various timers ticking.
Note that link state protocols, as well as BGP, send "hellos" periodically,
but not full information. With these protocols, only changes are advertised.
for purposes of this comment, EIGRP is considered "link state" Note also
that the frequency of the hellos increases with these. The designers
determined that more very small packets was an acceptable price for faster
reporting of failures in networks.
All routing protocols contain some mechanism for detecting and dealing with
failure. Some tell all they know. others do not.
HTH
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Aki Anttila
Sent: Thursday, August 09, 2001 9:52 PM
To: [EMAIL PROTECTED]
Subject: Re: RIP -- suppressing null update [7:15469]
Hi!
My experience says that if the router does not have anything to send (f.ex.
due to SH), then the update is suppressed.
Aki
At 13:41 9.8.2001 -0400, you wrote:
>At 11:09 AM 8/9/01, kwock99 wrote:
> >Hi All,
> >
> >One of my router does not recieve the routing update on RIP. Here is the
> >"show
> >ip protocol".
>
>Is this the "show ip protocol" on the router that is not receiving routing
>updates or on the router that is supposedly sending them?
>
>Here are some things to check:
>
>Are both routers using RIPv2?
>Is there a split horizon issue that is suppressing the update?
>Have you done anything tricky with subnet masks and VLSM?
>Is there a summarization issue?
>
>On the router that is sending but then suppressing updates, (serial
>interface 70.0.0.2), what is its subnet mask? What is the address and
>subnet mask of the router at the other end?
>
>Can you send us your configs?
>
>Priscilla
>
>
> >R4#sh ip prot
> >Routing Protocol is "rip"
> > Sending updates every 30 seconds, next due in 3 seconds
> > Invalid after 180 seconds, hold down 180, flushed after 240
> > Outgoing update filter list for all interfaces is not set
> > Incoming update filter list for all interfaces is not set
> > Redistributing: rip
> > Default version control: send version 2, receive version 2
> > Interface Send Recv Key-chain
> > Serial0 2 2
> > Routing for Networks:
> > 70.0.0.0
> > 130.0.0.0
> > Routing Information Sources:
> > Gateway Distance Last Update
> > Distance: (default is 120)
> >
> >
> >After I turn on the debug ip rip events, Here is the message:
> >
> >
> >RIP: sending v2 update to 224.0.0.9 via Serial0 (70.0.0.2) - suppressing
>null
> >update
> >RIP: sending v2 update to 224.0.0.9 via Serial0 (70.0.0.2) - suppressing
>null
> >update
> >RIP: sending v2 update to 224.0.0.9 via Serial0 (70.0.0.2) - suppressing
>null
> >update
> >
> >
> >Anyone knows what is wrong and how to configure the router to get the
>update.
> >
> >Thanks in advance.
> >
> >Best regards
> >Francis Tsui
>________________________
>
>Priscilla Oppenheimer
>http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=19113&t=15469
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