From: san (san.study@gmail.com)
Date: Sun May 01 2005 - 00:13:47 GMT-3
Hi,
Can some one clarify me with the operation of "default-information
originate" with RIP. I see two different behaviour. Can you say how
its supposed to behave.
R8-----ospf-------R2-----RIP V2 -------R4------
router rip
network R1-R2-n/w
default-information originate
1. It will originate the default routes to RIP neighbor, if its
present in rip database only ? (by means of other neighbors or
redistributed from other protocols ? )
2. If the above case is correct, default route learnt via OSPF on the
same router cannot be redistributed to rip neighbor ? Is this correct
?
3. Does it differ in case of V1 & V2 ?
4. My observations, not sure whats the difference. Below is what i
think might be the difference to update or not to the neighbor. May
be there could be someother factor too which i dont know. Shed me
some light. I can get the debugs upon request.
Instance 1:
-------------
Assumes R2's database shows as the below, (R8 sends default
infomation , R2 learns as O E2). Then in this case, R4 receives the
default route from R2 irrespective of whether
default-information-originate is used or not.
R2:
----
R2#sh ip rip data
0.0.0.0/0 auto-summary
0.0.0.0/0 redistributed
[2] via 8.8.8.8, <<<<<<<<<<<<< Via or Nexthop is "non-0.0.0.0."
R2#sh ip route (partial)
O*E2 0.0.0.0/0 [110/1] via 110.50.13.58, 02:12:49, Ethernet0/0
R2#
R2#b router
router ospf 100
router-id 2.2.2.2
log-adjacency-changes
area 10 virtual-link 1.1.1.1
redistribute rip metric 5 subnets
network 21.21.21.0 0.0.0.255 area 10
network 110.50.13.48 0.0.0.15 area 20
default-information originate
!
router rip
version 2
redistribute ospf 100 metric 2
passive-interface default
no passive-interface Serial1/0
network 110.0.0.0
default-information originate
distance 100 0.0.0.0 255.255.255.0 22
no auto-summary
!
Instance 2:
---------------
Assume R6's RIP database show as below. Then in this case, R6 does not
send the default route in rip routing updates irrespective of whether
default-information originate is used or not.
((similar behaviour from R6..Failure case))
R6#sh ip rip data
0.0.0.0/0 auto-summary
0.0.0.0/0 redistributed
[0] via 0.0.0.0, <<<<<<<<<<<<<<< Via is 0.0.0.0
router ospf 100
router-id 6.6.6.6
log-adjacency-changes
redistribute rip metric 5 subnets route-map rip-to-ospf
network 16.16.16.0 0.0.0.255 area 0
network 110.50.31.0 0.0.0.255 area 0
!
router rip
version 2
redistribute ospf 100 metric 1 route-map ospf-to-rip
passive-interface default
no passive-interface Ethernet0/0
network 110.0.0.0
default-information originate
no auto-summary
!
R6#sir
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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 110.50.31.1 to network 0.0.0.0
16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O E2 16.0.0.0/8 [110/5] via 110.50.31.1, 02:09:06, Serial0/0
C 16.16.16.0/24 is directly connected, Loopback1
18.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O IA 18.18.18.18/32 [110/11186] via 110.50.31.1, 02:09:06, Serial0/0
O E2 18.0.0.0/8 [110/5] via 110.50.31.1, 02:09:06, Serial0/0
21.0.0.0/32 is subnetted, 2 subnets
O IA 21.21.21.1 [110/64] via 110.50.31.1, 02:09:06, Serial0/0
O IA 21.21.21.2 [110/11175] via 110.50.31.1, 02:09:07, Serial0/0
110.0.0.0/8 is variably subnetted, 7 subnets, 3 masks
O E2 110.50.13.80/29 [110/5] via 110.50.31.1, 02:09:07, Serial0/0
C 110.50.13.64/28 is directly connected, Ethernet0/0
C 110.50.31.0/24 is directly connected, Serial0/0
O IA 110.50.13.48/28 [110/11185] via 110.50.31.1, 02:09:09, Serial0/0
C 110.50.46.0/24 is directly connected, BRI0/0
O E2 110.50.32.0/24 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
O E2 110.50.33.0/24 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
144.144.0.0/16 is variably subnetted, 2 subnets, 2 masks
O E2 144.144.0.0/16 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
O E2 144.144.144.0/24 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
13.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O E2 13.12.0.0/14 [110/10] via 110.50.31.1, 02:09:09, Serial0/0
O E2 13.0.0.0/8 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
14.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O E2 14.14.14.0/24 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
O E2 14.0.0.0/8 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
O E2 15.0.0.0/8 [110/5] via 110.50.31.1, 02:09:09, Serial0/0
R 15.15.15.0/24 [120/1] via 110.50.13.75, 00:00:27, Ethernet0/0
O*E2 0.0.0.0/0 [110/1] via 110.50.31.1, 02:09:10, Serial0/0
R6#
Thanks in Advance
/SAN
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