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RIP: sending v2 update to 224.0.0.9

Posted on 2009-12-31
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Last Modified: 2012-06-21
When I turn on "debug ip rip events" I see something like this:

R1#
*Dec 27 08:02:40.422: RIP: received v2 update from 192.168.2.2 on Serial0/0
*Dec 27 08:02:40.426: RIP: Update contains 2 routes
R1#
*Dec 27 08:02:46.286: RIP: sending v2 update to 224.0.0.9 via Serial0/0 (192.168.2.1) - suppressing null update
R1#

What gives with the sending to <224.0.0.9> ? That's not in my network or anything. I'm guessing it's some default behavior.
R1#
R1#
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

R    192.168.4.0/24 [120/1] via 192.168.2.2, 00:00:01, Serial0/0
C    192.168.2.0/24 is directly connected, Serial0/0
R    192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:01, Serial0/0
R1#
R1#
R1#sh ip rip database
192.168.2.0/24    auto-summary
192.168.2.0/24    directly connected, Serial0/0
192.168.3.0/24    auto-summary
192.168.3.0/24
    [1] via 192.168.2.2, 00:00:09, Serial0/0
192.168.4.0/24    auto-summary
192.168.4.0/24
    [1] via 192.168.2.2, 00:00:09, Serial0/0
R1#
R1#

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Question by:GivenRandy
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FunkyBrown earned 2000 total points
ID: 26155997
From Wikipedia, It appears that the address 224.0.0.9 is a multicast address, used to send RIP routing information to all RIP v2 routers on a network segment.  When information is sent to this address, it is multicast out to addresses on your local area network.
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by:GivenRandy
ID: 31671678
Ah, thanks. I'll include the link:

http://en.wikipedia.org/wiki/Multicast_address
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