From: Narbik Kocharians (narbikk@gmail.com)
Date: Thu Jul 06 2006 - 13:47:04 ART
RIP does not care if the other end point is down or not, if RIP does not
receive the updates from a router on a point-to-point or multipoint
interface, it has two timers that it will use to handle that situation,
invalidation timer and Flush timer.
There are two reasons that Cisco came up with this extension:
The periodic updates (every 30 seconds be default) can keep the circuit up,
and the second reason is to cut down on the number of periodic updates even
on a Point-to-point connections.
Its because of these two points that the command "ip rip triggered" is only
available on the wan interfaces and it has nothing to do with neighbor down
detection, it has provisions for that already. I am sorry but I have to
disagree.
Narbik Kocharians
CCIE# 12410 (R&S, SP, Security)
CCSI# 30832
Network Learning, Inc. (CCIE class Instructor)
www.ccbootcamp.com (CCIE Training)
On 7/6/06, Brian Dennis <bdennis@internetworkexpert.com> wrote:
>
> Think about it like this. If you run RIP triggered across a P2P serial
> link and the remote end goes down, your local interface should also go
> down. This will allow your local router to detect that the remote
> router's routes should be removed from the routing table. Now if it's a
> multipoint interface like Ethernet (more than one endpoint possible)
> then if the remote router goes down, the Ethernet interface will not
> normally go down assuming a hub or switch is being used. This means
> that even though the remote router is down, its routes will not be
> removed from your local router's routing table since you are not
> expecting periodic updates and you can not determine based on the
> interface state if the remote router is down.
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Sami
> Sent: Thursday, July 06, 2006 4:56 AM
> To: ccielab@groupstudy.com
> Subject: RIP triggered
>
> Group,
>
> ip rip triggered command is not under ethernet interface ? is there any
> speific reason for not having it ?
>
> R4(config)#int fastEthernet 0/0
> R4(config-if)#ip rip ?
> advertise Specify update interval
> authentication Authentication control
> receive advertisement reception
> send advertisement transmission
> v2-broadcast send ip broadcast v2 update
>
> R4(config)#int s0/0/0
>
> R4(config-if)#ip rip ?
> advertise Specify update interval
> authentication Authentication control
> receive advertisement reception
> send advertisement transmission
> triggered enable rfc2091 triggered rip
> v2-broadcast send ip broadcast v2 update
>
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