From: Aidan Marks (amarks@cisco.com)
Date: Mon Feb 03 2003 - 20:50:05 GMT-3
Your mileage may vary on different code versions but I quickly got this to
work by creating a distribute-list in on the bgp process referencing a
prefix list for the null0 route. The null route was in bgp and not in the
RIB after clear ip route *.
Be wary of your actions and the potential routing loop disaster you can get
into with removing null0 routes. They are there for a very good reason.
Aidan
At 10:02 AM 4/02/2003, love cisco wrote:
>How to remove Null0 in the routing table? Because BGP aggregate-address
>create Null0 route. If the lab ask you remove it.
>
>router bgp 100
>network 192.168.10.0 mask 255.255.255.240
>network 192.168.10.16 mask 255.255.255.240
>network 192.168.20.32 mask 255.255.255.240
>network 192.168.20.48 mask 255.255.255.240
>aggregate-address 192.168.10.0 255.255.255.0 summary-only
>aggregate-address 192.168.20.0 255.255.255.0 summary-only
>neighbor 150.50.17.2 remote-as 200
>neighbor 150.50.17.2 update-source Loopback0
>no auto-summary
>
>
>R1#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
>
> 200.0.0.0/32 is subnetted, 2 subnets
>C 200.0.0.1 is directly connected, Loopback0
>B 200.0.0.4 [20/0] via 150.50.17.2, 13:46:01
> 192.168.10.0/24 is variably subnetted, 3 subnets, 2 masks
>B 192.168.10.0/24 [200/0] via 0.0.0.0, 14:33:26, Null0
>C 192.168.10.0/28 is directly connected, Loopback1
>C 192.168.10.16/28 is directly connected, Loopback2
> 192.168.20.0/24 is variably subnetted, 3 subnets, 2 masks
>C 192.168.20.48/28 is directly connected, Loopback4
>C 192.168.20.32/28 is directly connected, Loopback3
>B 192.168.20.0/24 [200/0] via 0.0.0.0, 14:18:13, Null0
> 10.0.0.0/25 is subnetted, 1 subnets
>B 10.1.1.0 [20/0] via 150.50.17.2, 13:46:01
> 150.50.0.0/24 is subnetted, 1 subnets
>C 150.50.17.0 is directly connected, FastEthernet0/0
>
>
>
>_________________________________________________________________
>Cb7QOBTX MSN Explorer: http://explorer.msn.com/lccn/
>.
.
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