[c-nsp] no bgp route from 0.0.0.0 for a interface ip address

[tao liu]

route to 192.168.2.50 with a nex-hop 0.0.0.0 should exists in bgp table,
however it doesn't

On Tue, Apr 19, 2011 at 11:06 PM, Keegan Holley
<keegan.holley at sungard.com>wrote:

> Are you asking about a route to 0.0.0.0 or the default or a route with a
> next-hop of 0.0.0.0?
>
>
> On Tue, Apr 19, 2011 at 10:46 AM, tao liu <taosysnet at gmail.com> wrote:
>
>> following is the config for bgp and show ip route, thanks
>>
>> router bgp 65453
>>  no synchronization
>>  bgp router-id 192.168.96.2
>>  bgp log-neighbor-changes
>>  redistribute connected route-map NEW
>>  redistribute static route-map NEW
>>  neighbor 192.168.2.49 remote-as 65450
>>  neighbor 192.168.2.49 send-community
>>  neighbor 192.168.96.1 remote-as 65453
>>  neighbor 192.168.96.1 update-source Loopback0
>>  neighbor 192.168.96.1 next-hop-self
>>  no auto-summary
>>
>> ip bgp-community new-format
>>
>> route-map NEW permit 10
>>  set community 65453:100
>>
>> routerB#show ip route 192.168.2.50
>> Routing entry for 192.168.2.50/32
>>  Known via "connected", distance 0, metric 0 (connected)
>>  Redistributing via bgp 65453
>>  Routing Descriptor Blocks:
>>  * directly connected, via Multilink1
>>      Route metric is 0, traffic share count is 1
>>
>> routerB#show ip route connected :
>> C        192.168.2.48/29 is directly connected, Multilink1
>> C        192.168.2.49/32 is directly connected, Multilink1
>> L        192.168.2.50/32 is directly connected, Multilink1
>>
>>
>> routerB#show ip int multilink 1
>> Multilink1 is up, line protocol is up
>>  Internet address is 192.168.2.50/29
>>  Broadcast address is 255.255.255.255
>>  Address determined by non-volatile memory
>>  Peer address is 192.168.2.49
>>  MTU is 1500 bytes
>>  Helper address is not set
>>  Directed broadcast forwarding is disabled
>>  Outgoing access list is not set
>>  Inbound  access list is not set
>>  Proxy ARP is enabled
>>  Local Proxy ARP is disabled
>>  Security level is default
>>  Split horizon is enabled
>>  ICMP redirects are always sent
>>  ICMP unreachables are always sent
>>
>> On Tue, Apr 19, 2011 at 9:12 PM, Harold 'Buz' Dale <buz.dale at usg.edu>
>> wrote:
>>
>> > At first blush it looks like 192.168.2.50 can't talk to anyone.  Try
>> > changing his mask to /31 or something so that 192.168.2.49 is on the
>> same
>> > network..
>> > ----
>> > BGP routing table entry for 192.168.2.50/32
>> > ----
>> >
>> > -----Original Message-----
>> > From: cisco-nsp-bounces at puck.nether.net [mailto:
>> > cisco-nsp-bounces at puck.nether.net] On Behalf Of tao liu
>> > Sent: Tuesday, April 19, 2011 8:55 AM
>> > To: cisco-nsp at puck.nether.net
>> > Subject: [c-nsp] no bgp route from 0.0.0.0 for a interface ip address
>> >
>> > Why bgp route from 0.0.0.0 doesn't exist, 192.168.2.50 is a interface ip
>> > address on routerB!
>> > Instead bgp route for 192.168.2.50 is from "192.168.96.1" and
>> > "192.168.2.49", it is strange.
>> > we redistribute static and connected on all four routers.
>> > the topology like below:
>> >
>> >
>> > lo0:192.168.96.2                lo0:192.168.96.1
>> > routerA                 ----   ebgp  -----     routerB
>> > ------ibgp-------- routerBB
>> >              192.168.2.49
>> > 192.168.2.50                                             |
>> > |
>> > |
>> >
>> >
>> |----------------ibgp--------------------------routerAA--------ebgp---------------
>> >
>> > routerB# show ip bgp 192.168.2.50
>> > BGP routing table entry for 192.168.2.50/32, version 151
>> > Paths: (2 available, best #2, table default, RIB-failure(17) - next-hop
>> > mismatch
>> > )
>> >  Advertised to update-groups:
>> >     1
>> >  65450
>> >    192.168.96.1 from 192.168.96.1 (192.168.96.1)
>> >      Origin incomplete, metric 0, localpref 100, valid, internal
>> >  65450
>> >    192.168.2.49 from 192.168.2.49 (192.168.0.2)
>> >      Origin incomplete, metric 0, localpref 100, valid, external, best
>> >  _______________________________________________
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>> >
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>