RIP: sending general request on Ethernet0 to 0.0.0.0 ??????

Dowima

Hi all ......
I have configure a small scenario of three routers as the following :

(192.168.2.0) (192.168.3.0)
R1 (s1 = .2)

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(.1 = s0 ) R2 ( s1 =.1)

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(.2 = s0) R3
R1 : 2507
R2 : 2501
R3 : 2507

configure ripv1 on all of them

now i did the following :

R3#debug ip rip
R3#clear ip route *
RIP: sending general request on Serial0 to 0.0.0.0
RIP: sending general request on Serial0 to 224.0.0.9
RIP: received v1 update from 192.168.3.1 on Serial0
192.168.2.0 in 1 hops
RIP: sending v1 update to 0.0.0.0 via Serial0 (192.168.3.2) - suppressing null update




when i do it on R2 i got this :

R2#debug ip rip
R2#clear ip route *
RIP: sending general request on Serial0 to 255.255.255.255
RIP: sending general request on Serial0 to 224.0.0.9
RIP: sending general request on Serial1 to 255.255.255.255
RIP: sending general request on Serial1 to 224.0.0.9
RIP: sending v1 update to 255.255.255.255 via Serial0 (192.168.2.1)
network 192.168.3.0, metric 1
RIP: sending v1 update to 255.255.255.255 via Serial1 (192.168.3.1)
network 192.168.2.0, metric 1

when i do it on R1 i got this :

R1#debug ip rip
R1#clear ip route *
04:47:56: RIP: sending request on Serial1 to 255.255.255.255
04:47:56: RIP: received v1 update from 192.168.2.1 on Serial1
04:47:56: 192.168.3.0 in 1 hops
04:47:58: RIP: sending v1 flash update to 255.255.255.255 via Serial1 (192.168.2.2)
04:47:58: RIP: build flash update entries - suppressing null update
04:47:59: RIP: received v1 update from 192.168.2.1 on Serial1
04:47:59: 192.168.3.0 in 1 hops
04:48:04: RIP: sending v1 update to 255.255.255.255 via Serial1 (192.168.2.2)
04:48:04: RIP: build update entries - suppressing null update

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Questions :

1.In R3 Why when clearing routing table it request updated from 0.0.0.0 ( what is this address)
2. In R3 & R2 why they request updates from the multicast address while only using ripV1