two T1 Lines

[azmath.hk]

Dear all,

We have two T1 lines connected to our router and when we type show ip route its show the following:-

Cisco router#show 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 0.0.0.0 to network 0.0.0.0

12.0.0.0/8 is variably subnetted, 8 subnets, 5 masks

C 12.124.114.16/30 is directly connected, Serial0/1

C 12.124.114.17/32 is directly connected, Serial0/1(why I am seeing this route)

C 12.125.140.153/32 is directly connected, Serial0/0(why I am seeing this route)

C 12.125.140.152/30 is directly connected, Serial0/0

S 12.171.2.0/24 [1/0] via 12.31.48.83

S* 0.0.0.0/0 is directly connected, Serial0/1

is directly connected, Serial0/0

Cisco router#

Usually I should see only the other end IP address which is connected to my serial interface.

My question is why we are seeing the above cited routes in our routing table.

Please provide me your valuable feedback?.

Regards,

Khan

[Edison Ortiz]

Khan,

I tried on my lab and you need to clear the route table for this to disappear.

#clear ip route [network or host]

[azmath.hk]

I have tried clear ip route and its not working....

If i type clear ip route * will i loose connection to router...or it just simply refresh the routing table....

[Edison Ortiz]

If it's a remote router you will. The routing table won't be refreshed with this route because it's not using any dynamic routing protocol.

You should be able to type

#clear ip route 12.124.114.17

#clear ip route 12.125.140.153

I just did it here and it worked.

Of course, you need to have "no peer neighbor-route" configured on the interface.

[azmath.hk]

Its working now as i have tried clear ip route * after applying that command in interface s0/1...Just last quick question if i applied this command is there any draw back for this or it has to be there...please advice..

Regards,

Khan

[Edison Ortiz]

Personally, I rather have the remote IP inserted into the routing table without the aid of any dynamic/static routing protocols. It's a L3 version of CDP. But I see it bothered you, so we recommended that option to be disabled.

It doesn't hurt routing nor any other functionality. It's there for additional troubleshooting. Sort of a feature enhancenment within the ppp protocol.

[azmath.hk]

Its working now i have tried clear ip route *

Thank everyone for ur help...

Regards,

Khan