"show ip route" - Routing table is empty

Unanswered Question
May 3rd, 2007

Hi folks,

I configured a default gateway and a static default route on my

cat4506 switch running 12.1(19)EW2.

ip default-gateway X.X.X.X

ip route 0.0.0.0 0.0.0.0 X.X.X.X

I issued show ip route and nothing displays.

#sh ip route

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 not set

It should have at least show a gateway of last resort in the routing

table or a " S* 0.0.0.0/0 [1/0] via X.X.X.X " entry.. Right?

I have verified that ip routing is enabled.

Why is the routing table empty? Any ideas?

Regards,

Carol

I have this problem too.
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mohammedmahmoud Thu, 05/03/2007 - 22:10

Hi,

For a route to be entered into the routing table its next-hop must be reachable, so the reason that these routes are not inserted into the routing table is that there is no up/up interface that the next-hop would be reachable upon.

HTH, please rate if it does help,

Mohammed Mahmoud.

carogo Thu, 05/03/2007 - 22:30

Hi Mohammed,

Thanks for the response. The switch is configured with a management vlan with an ip address.. This is the only L3 address configured in the switch.

I checked sh int and it's UP, UP.

So it could not be the problem right?

Regards,

Carol

mohammedmahmoud Thu, 05/03/2007 - 22:40

Hi,

No it is still the problem, if the next-hop of the static routes is not recursive via the ip address under the VLAN interface it would still not enter the routing table.

example:

Router#sh ip int brief

Interface IP-Address OK? Method Status Prot

ocol

Loopback0 192.168.99.1 YES manual up up

ip route 0.0.0.0 0.0.0.0 10.10.10.1

Router#sh ip route

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, 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 not set

C 192.168.99.0/24 is directly connected, Loopback0

--> Since the next-hop of my static route "10.10.10.1" is not recursive reachable via the ip address of the interface "192.168.99.0" then the route is never entered into the routing table.

HTH, please rate if it does help,

Mohammed Mahmoud.

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