ā03-04-2010 05:13 PM - edited ā03-06-2019 10:00 AM
Hi all,
I have 2 routers at home network.
2650xm ix connected to ISP Cable modem
2620 is connected to 2650XM by switch and they both are in same network.
Routing protocol config on 2650
router ospf 10
log-adjacency-changes
redistribute connected
network 192.168.1.0 0.0.0.255 area 0
!
router rip
version 2
network 192.168.1.0
default-information originate
2650xm#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 96.51.144.1 to network 0.0.0.0
64.0.0.0/32 is subnetted, 1 subnets
S 64.59.135.150 [254/0] via 96.51.144.1, FastEthernet0/0
96.0.0.0/22 is subnetted, 1 subnets
C 96.51.144.0 is directly connected, FastEthernet0/0
C 10.0.0.0/8 is directly connected, Loopback0
C 192.168.1.0/24 is directly connected, FastEthernet1/0
S* 0.0.0.0/0 [254/0] via 96.51.144.1
2650xm#sh ip pro
2650xm#sh ip protocols
Routing Protocol is "ospf 10"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.10.10.10
It is an autonomous system boundary router
Redistributing External Routes from,
connected
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
192.168.1.0 0.0.0.255 area 0
Reference bandwidth unit is 100 mbps
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 110)
Routing Protocol is "rip"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Sending updates every 30 seconds, next due in 4 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Redistributing: rip
Default version control: send version 2, receive version 2
Interface Send Recv Triggered RIP Key-chain
FastEthernet1/0 2 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
192.168.1.0
Routing Information Sources:
Gateway Distance Last Update
192.168.1.40 120 07:19:30
Distance: (default is 120)
2620 router Protocol config
router ospf 10
log-adjacency-changes
network 192.168.1.0 0.0.0.255 area 0
!
router rip
version 2
network 192.168.1.0
2620Router#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 192.168.1.1 to network 0.0.0.0
C 2.0.0.0/8 is directly connected, Loopback0
O E2 10.0.0.0/8 [110/20] via 192.168.1.1, 05:54:19, FastEthernet0/0
C 192.168.1.0/24 is directly connected, FastEthernet0/0
R* 0.0.0.0/0 [120/1] via 192.168.1.1, 00:00:20, FastEthernet0/0***********************************************************
MY Question is why router 2620 learn route from 2650 using rip as default? as ospf has less AD which is 110 then rip?
Right now 2650 is advertising routes to 2620 router by Rip and OSPF and 2620 has chosen Rip protocol as compare to OSPF?
If some one can explain this to me please
mant thanks
mahesh
Solved! Go to Solution.
ā03-05-2010 12:21 AM
mahesh18 wrote:
Hi Edison,
thanks for reply
But i still can not understand why router 2620 has chosen rip?
thanks
mahesh
Mahesh
The 2620 has chosen the RIP default-route because only RIP is sending a default-route from the 2651. Using "redistribute connected" under the OSPF configuration will not tell OSPF to advertise a default route.
So if you want a default-route to be advertised by OSPF as well as RIP you need to use one of the options supplied by Edison.
Jon
ā03-05-2010 07:31 AM
If the 2620 needs to reach the internet, per your current configuration, it will use RIP to reach the router advertising the default route.
Once the packet reaches the ASBR router, it will use static to reach the internet (next hop 96.51.144.1).
The packet won't be dropped unless you have NAT issues.
Regards
Edison
ā03-04-2010 05:23 PM
Mahesh,
You can redistribute any route into OSPF with the exception of the default route.
To generate a default route into OSPF
If you want the 2620 router to obtain the default via OSPF, I recommend using the command on the first bullet point.
Regards
Edison
ā03-04-2010 05:31 PM
Hi Edison,
thanks for reply
But i still can not understand why router 2620 has chosen rip?
thanks
mahesh
ā03-05-2010 12:21 AM
mahesh18 wrote:
Hi Edison,
thanks for reply
But i still can not understand why router 2620 has chosen rip?
thanks
mahesh
Mahesh
The 2620 has chosen the RIP default-route because only RIP is sending a default-route from the 2651. Using "redistribute connected" under the OSPF configuration will not tell OSPF to advertise a default route.
So if you want a default-route to be advertised by OSPF as well as RIP you need to use one of the options supplied by Edison.
Jon
ā03-05-2010 06:48 AM
Hi Jon,
correct me if i am wrong so my understanding is two routers are still ospf nei and they exchange hello paclets.
but if router 2620 needs access to internet then it uses the default route advertisied by the rip.
Thanks
mahesh
ā03-05-2010 06:57 AM
Hi,
//
correct me if i am wrong so my understanding is two routers are still ospf nei and they exchange hello paclets. // - Yes. Thats correct. If two routers are ospf neighbors then they will exchange the hello packets with respect to time-interval's configured on those interfaces.
//but if router 2620 needs access to internet then it uses the default route advertisied by the rip. //
No. The traffic which is initiated from 2620 router it will reach till 2650 after that the packet will get drop.
Because 2650 networks are not redistributed into ospf network.
But if you have conneted in the internet link in RIP domain then it is possible. Hope you got it.
Regards
Karuppu
ā03-05-2010 07:27 AM
Hi,
can you explain this in more detail
Because 2650 networks are not redistributed into ospf network.
thanks
mahesh
ā03-05-2010 07:33 AM
No. The traffic which is initiated from 2620 router it will reach till 2650 after that the packet will get drop.
Because 2650 networks are not redistributed into ospf network.
That's incorrect.
ā03-05-2010 07:31 AM
If the 2620 needs to reach the internet, per your current configuration, it will use RIP to reach the router advertising the default route.
Once the packet reaches the ASBR router, it will use static to reach the internet (next hop 96.51.144.1).
The packet won't be dropped unless you have NAT issues.
Regards
Edison
ā03-05-2010 08:33 AM
Hi Edison
thanks for great reply.
ā03-05-2010 08:34 AM
Hi Jon,
Thnaks again for great explanatioin
mahesh
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