10-16-2012 05:52 PM - edited 03-07-2019 09:30 AM
Hello! I have just configured three cisco routers with OSPF areas 0 and 1. One router in area 0 also has a RIP link to a soho router for WAN access. I have interconnectivity between all three routers through OSPF. I can also reach the soho through the RIP link from all three routers. My problem is that the router running RIP shows the public IP from my soho on RIP, has the default-gateway set properly, but my other two routers are not picking up the default gateway and they can't reach the public IP even though they can reach the soho. With a previous eigrp setup, the default gateway was inherited by router 2 and 1. I have pasted my run configs and some extra info. Any enlightenment is appreciated!
R3 - directly connected to a soho e1000 through an AUI for e0
ip subnet-zero
ip domain-name white.com
ip name-server 68.105.28.11
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Ethernet0
ip address 192.168.2.2 255.255.255.0
ip rip send version 2
ip rip receive version 2
bandwidth 10000000
!
interface Serial0
ip address 192.168.0.2 255.255.255.252
no fair-queue
!
interface Serial1
no ip address
shutdown
!
router ospf 100
redistribute rip
network 192.168.0.0 0.0.0.3 area 0
!
router rip
version 2
redistribute static
redistribute ospf 100
network 192.168.2.0
default-metric 1
!
no ip classles
Gateway of last resort is 192.168.2.1 to network 0.0.0.0
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
O IA 10.0.0.0 [110/66] via 192.168.0.1, 00:24:48, Serial0
98.0.0.0/22 is subnetted, 1 subnets
R 98.164.4.0 [120/1] via 192.168.2.1, 00:00:13, Ethernet0
192.168.0.0/30 is subnetted, 2 subnets
C 192.168.0.0 is directly connected, Serial0
O 192.168.0.4 [110/65] via 192.168.0.1, 00:24:49, Serial0
C 192.168.2.0/24 is directly connected, Ethernet0
R* 0.0.0.0/0 [120/1] via 192.168.2.1, 00:00:13, Ethernet0
R2 - direct serial connection to R3, FA to R1
ip domain name white.com
ip name-server 68.105.28.11
!
ip cef
!
!
interface FastEthernet0/0
ip address 192.168.0.6 255.255.255.252
duplex auto
speed auto
!
interface Serial1/0
bandwidth 10000000
ip address 192.168.0.1 255.255.255.252
clockrate 64000
!
interface Serial1/1
no ip address
shutdown
!
interface Serial1/2
no ip address
shutdown
!
interface Serial1/3
no ip address
shutdown
!
router ospf 100
router-id 2.2.2.2
log-adjacency-changes
network 192.168.0.0 0.0.0.3 area 0
network 192.168.0.4 0.0.0.3 area 0
!
ip http server
no ip http secure-server
ip classless
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
O IA 10.0.0.0 [110/2] via 192.168.0.5, 00:27:00, FastEthernet0/0
192.168.0.0/30 is subnetted, 2 subnets
C 192.168.0.0 is directly connected, Serial1/0
C 192.168.0.4 is directly connected, FastEthernet0/0
O E2 192.168.2.0/24 [110/20] via 192.168.0.2, 00:27:00, Serial1/0
R1 - running area 0 to R2, and an area 1 for a switch group - just for experimentation
ip domain name white.com
ip name-server 68.105.28.11
ip dhcp excluded-address 10.0.0.1 10.0.0.4
!
ip dhcp pool home
network 10.0.0.0 255.255.255.0
default-router 10.0.0.1
dns-server 68.105.29.12
!
interface FastEthernet0/0
ip address 192.168.0.5 255.255.255.252
duplex auto
speed auto
!
interface Serial0/0
no ip address
shutdown
no fair-queue
!
interface FastEthernet0/1
ip address 10.0.0.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1.1
!
interface FastEthernet0/1.2
!
router ospf 100
router-id 1.1.1.1
log-adjacency-changes
network 10.0.0.0 0.0.0.255 area 1
network 192.168.0.4 0.0.0.3 area 0
!
ip http server
ip classless
Gateway of last resort is not set
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.0.0 is directly connected, FastEthernet0/1
192.168.0.0/30 is subnetted, 2 subnets
O 192.168.0.0 [110/2] via 192.168.0.6, 00:29:27, FastEthernet0/0
C 192.168.0.4 is directly connected, FastEthernet0/0
O E2 192.168.2.0/24 [110/20] via 192.168.0.6, 00:29:27, FastEthernet0/0
**********Ping tests end to end*************
R1#ping 192.168.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/32/36 ms
R1#ping 98.164.4.240
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 98.164.4.240, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R3#ping 98.164.4.240
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 98.164.4.240, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/8 ms
R3#ping 68.105.28.11
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 68.105.28.11, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/17/20 ms
Solved! Go to Solution.
10-17-2012 12:08 AM
Hi,
yes you will have to propagate the default-route into OSPF on the ASBR with the OSPF procees command:
default-information originate
Regards.
Alain
Don't forget to rate helpful posts.
10-16-2012 06:33 PM
I'm an EIGRP guy by trade, but I have a theory. Is OSPF happy with redistribution without specifying a metric?
Sent from Cisco Technical Support iPad App
10-16-2012 06:43 PM
Thank you for the suggestion -- I looked up the specs and ospf uses a default metric of 20 and assigns a type 2 when not designated. I went back and assigned a metric of 1 and it still didn't make a different.
What is confusing me is that I can ping from my ospf interface on r3 to the public IP, so the redistribution from RIP to OSPF is working. Plus, the other OSPF routers are finding the soho that connects to the public IP, so the redistribute is reaching them.
I'm wondering if I have to manually set the default-gateway on area-border routers -- which wouldn't make OSPF as easy as EIGRP to manage.
10-17-2012 12:08 AM
Hi,
yes you will have to propagate the default-route into OSPF on the ASBR with the OSPF procees command:
default-information originate
Regards.
Alain
Don't forget to rate helpful posts.
10-17-2012 02:16 PM
Thank you Alain, that definitely did the trick. I take the CCNA composite tomorrow and there is no way I could have focused on the fundamentals with that mystery hanging in my brain.
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