Re: route lookup based on default route

this is standard behavoir for 'show ip route' if you only have a 0.0.0.0
default route...

take a look at 'sh ip cef exact-route' and see what it says...

R1#sh ip route
Gateway of last resort is 12.12.12.1 to network 0.0.0.0
     12.0.0.0/24 is subnetted, 1 subnets
C 12.12.12.0 is directly connected, FastEthernet0/0
B* 0.0.0.0/0 [200/0] via 12.12.12.1, 00:01:58

R1#sh ip route 100.100.100.100
% Network not in table

R1#ping 100.100.100.100
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 100.100.100.100, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/102/140 ms

R1#sh ip cef exact-route 12.12.12.2 100.100.100.100
12.12.12.2 -> 100.100.100.100: FastEthernet0/0 (next hop 12.12.12.1)

en
conf t
host R1
int f0/0
ip add 12.12.12.1 255.255.255.0
no shut
router bgp 1
neighbor 12.12.12.2 remote-as 1
neighbor 12.12.12.2 default-originate

en
conf t
host R1
int f0/0
ip add 12.12.12.2 255.255.255.0
no shut
router bgp 1
neighbor 12.12.12.1 remote-as 1
neighbor 12.12.12.1 default-originate
 --
Garry L. Baker

"With sufficient thrust, pigs fly just fine..." - RFC 1925

On Fri, Jun 10, 2011 at 3:06 AM, Jules Eyabane <jep7619_at_gmail.com> wrote:

> hello group!
> on a remote BGP peer B, i issued the command "neighbor x.x.x.x
> default-originate" to send a default route to this peer A (output below).
> now, on A, i do see the default route in the routing table, but yet i can't
> lookup an unknown route using that default route. i made sure that the ip
> classless command was enabled (which it is by default on this IOS). what
> could be wrong?
>
> Rack6R5#sho ip route 0.0.0.0
> Routing entry for 0.0.0.0/0, supernet
> Known via "bgp 200", distance 200, metric 77, candidate default path, type
> internal
> Last update from 155.6.0.2 00:09:23 ago
> Routing Descriptor Blocks:
> * 155.6.0.2, from 155.6.0.2, 00:09:23 ago
> Route metric is 77, traffic share count is 1
> AS Hops 0
>
> Rack6R5#sho ip route 94.0.0.0
> % Network not in table
> Rack6R5#sho ip route 94.0.0.0 255.0.0.0
> % Network not in table
> Rack6R5#sho ip route 192.168.17.0 255.255.255.0
> % Network not in table
> Rack6R5#sho run | incl classless
> Rack6R5#sho run | incl Classless
> Rack6R5#
>
>
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Received on Fri Jun 10 2011 - 03:38:33 ART