From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Mon Dec 31 2001 - 12:03:00 GMT-3
Stephen,
I think Perry is correct that you should check the RID of the route in
question. I've seen this happen before when BGP's RID is different from
OSPF's.
Tom
>From: "Stephen Oliver" <stevie_oliver@hotmail.com>
>Reply-To: "Stephen Oliver" <stevie_oliver@hotmail.com>
>To: Parry.Chua@compaq.com, fred190044@hotmail.com, ccielab@groupstudy.com
>Subject: RE: BGP routes.
>Date: Mon, 31 Dec 2001 13:53:51 +0000
>
>Parry,
>
>Here's the BGP table and routing table along with the output from one of
>the
>prefixes not being marked as best.
>
>As you see the route has a next hop of 137.6.2.17 from router with RID of
>137.6.2.2. Both these prefixes are in the main routing table so my
>understanding was that the route should be marked best. I know I can turn
>off synchronization and get it to work but I didn't think I had to if the
>next hop was reachable. If I have to do a no sync then fine and my
>understanding of the rule is at fault.
>
>Thanks, Stephen.
>
> Network Next Hop Metric LocPrf Weight Path
>* i0.0.0.0 137.6.2.9 100 0 i
>* i5.0.0.0 137.6.2.17 0 100 0 111 100 i
>* i6.0.0.0 137.6.2.17 0 100 234 100 i
>* i7.0.0.0 137.6.2.17 0 100 0 100 i
>* i137.6.1.1/32 137.6.2.17 0 100 0 100 i
>* i137.6.2.2/32 137.6.2.9 0 100 0 i
>* i137.6.2.8/29 137.6.2.10 0 100 0 i
>*> 0.0.0.0 0 32768 i
>* i137.6.2.16/30 137.6.2.9 0 100 0 i
>*> 137.6.3.3/32 0.0.0.0 0 32768 i
>* 137.6.3.16/28 137.6.3.18 0 0 300 i
>*> 0.0.0.0 0 32768 i
>2612#show ip bgp 5.0.0.0
>BGP routing table entry for 5.0.0.0/8, version 0
>Paths: (1 available, no best path)
> Not advertised to any peer
> 111 100
> 137.6.2.17 (metric 176) from 137.6.2.10 (137.6.2.2)
> Origin IGP, metric 0, localpref 100, valid, internal, not
>synchronized
> Originator: 137.6.2.2, Cluster list: 137.6.5.5
>2612#show 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
>
> 137.6.0.0/16 is variably subnetted, 9 subnets, 4 masks
>O 137.6.2.9/32 [110/128] via 137.6.2.10, 00:04:25, Serial0/0
>C 137.6.2.8/29 is directly connected, Serial0/0
>O 137.6.2.10/32 [110/64] via 137.6.2.10, 00:04:25, Serial0/0
>O IA 137.6.2.2/32 [110/129] via 137.6.2.10, 00:02:30, Serial0/0
>O IA 137.6.5.5/32 [110/65] via 137.6.2.10, 00:02:30, Serial0/0
>O E2 137.6.1.1/32 [110/78] via 137.6.2.10, 00:02:30, Serial0/0
>C 137.6.3.3/32 is directly connected, Loopback0
>C 137.6.3.16/28 is directly connected, Ethernet0/0
>O 137.6.2.16/30 [110/176] via 137.6.2.10, 00:04:26, Serial0/0
>O E2 5.0.0.0/8 [110/78] via 137.6.2.10, 00:02:31, Serial0/0
>O E2 6.0.0.0/8 [110/78] via 137.6.2.10, 00:02:31, Serial0/0
>O E2 7.0.0.0/8 [110/78] via 137.6.2.10, 00:02:31, Serial0/0
>2612#
>
>
>>From: "Chua, Parry" <Parry.Chua@compaq.com>
>>To: "Stephen Oliver" <stevie_oliver@hotmail.com>,
>><fred190044@hotmail.com>,
>><ccielab@groupstudy.com>
>>Subject: RE: BGP routes.
>>Date: Mon, 31 Dec 2001 08:59:53 +0800
>>
>>Hi,
>>
>>Do a show ip bgp a.b.c.d and see nwhat is the reason that it is NOT the
>>best route,
>>if it is "no sync" and the route of a.b.c.d is from ospf, then you
>>should check the RID
>>of the network a.b.c.d
>>
>> > Parry Chua
>> >
>>
>>
>>-----Original Message-----
>>From: Stephen Oliver [mailto:stevie_oliver@hotmail.com]
>>Sent: Saturday, December 29, 2001 7:02 PM
>>To: fred190044@hotmail.com; ccielab@groupstudy.com
>>Subject: Re: BGP routes.
>>
>>
>>Fred,
>>
>>Well, for example, the 5.0.0.0 route is in the bgp table with next hop
>>as
>>137.6.2.17. This route is in the routing table, 137.6.2.16/30 but the 5
>>
>>prefix is not marked as best in the bgp table. I am trying to do this
>>by
>>not setting no sync just to test the bgp rules. I thought that since
>>the
>>next hop is reachable through an IGP then it would be marked as *> in
>>the
>>bgp table. I can get the route to be marked as *> by setting no sync
>>but I
>>wanted to avoid using this if I could. I probably just misunderstand
>>the
>>synchronization rule.
>>
>>Thanks, Stephen.
>>
>>
>> >From: "Fred Danson" <fred190044@hotmail.com>
>> >To: ccielab@groupstudy.com
>> >CC: stevie_oliver@hotmail.com
>> >Subject: Re: BGP routes.
>> >Date: Fri, 28 Dec 2001 09:42:48 -0500
>> >
>> >Which prefix is not working properly? Do you have "no sync" set in this
>>
>> >router? Would you mind posting your configs?
>> >
>> >
>> >>From: "Stephen Oliver" <stevie_oliver@hotmail.com>
>> >>Reply-To: "Stephen Oliver" <stevie_oliver@hotmail.com>
>> >>To: ccielab@groupstudy.com
>> >>Subject: BGP routes.
>> >>Date: Fri, 28 Dec 2001 12:09:54 +0000
>> >>
>> >>I have a BGP network with OSPF running along side. A loopback
>>propogates
>> >>through the BGP tables but on one router it is not installed as best
>>even
>> >>though OSPF provides a route to the next hop in the routing table. I
>> >>thought if this criteria was met the BGP table would mark the route as
>> >
>> >>for
>> >>best. The routing and BGP tables are below.
>> >>
>> >>Any ideas ?
>> >>
>> >>Thanks, Stephen.
>> >>
>> >>Gateway of last resort is not set
>> >>
>> >> 137.6.0.0/16 is variably subnetted, 9 subnets, 4 masks
>> >>O 137.6.2.9/32 [110/128] via 137.6.2.10, 00:00:12, Serial0/0
>> >>C 137.6.2.8/29 is directly connected, Serial0/0
>> >>O 137.6.2.10/32 [110/64] via 137.6.2.10, 00:41:05, Serial0/0
>> >>O IA 137.6.2.2/32 [110/129] via 137.6.2.10, 00:08:44, Serial0/0
>> >>O E2 137.6.1.1/32 [110/78] via 137.6.2.10, 00:08:44, Serial0/0
>> >>O IA 137.6.5.5/32 [110/65] via 137.6.2.10, 00:08:44, Serial0/0
>> >>C 137.6.3.3/32 is directly connected, Loopback0
>> >>C 137.6.3.16/28 is directly connected, Ethernet0/0
>> >>O 137.6.2.16/30 [110/176] via 137.6.2.10, 00:41:06, Serial0/0
>> >>O E2 5.0.0.0/8 [110/78] via 137.6.2.10, 00:08:46, Serial0/0
>> >>O E2 6.0.0.0/8 [110/78] via 137.6.2.10, 00:08:46, Serial0/0
>> >>O E2 7.0.0.0/8 [110/78] via 137.6.2.10, 00:08:46, Serial0/0
>> >>2612#show ip bgp
>> >>BGP table version is 4, local router ID is 137.6.3.3
>> >>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>> >>internal
>> >>Origin codes: i - IGP, e - EGP, ? - incomplete
>> >>
>> >> Network Next Hop Metric LocPrf Weight Path
>> >>* i5.0.0.0 137.6.2.17 0 100 0 111 100 i
>> >>* i6.0.0.0 137.6.2.17 0 100 0 100 i
>> >>* i7.0.0.0 137.6.2.17 0 100 0 100 i
>> >>* i137.6.1.1/32 137.6.2.17 0 100 0 100 i
>> >>* i137.6.2.2/32 137.6.2.9 0 100 0 i
>> >>* i137.6.2.8/29 137.6.2.10 0 100 0 i
>> >>*> 0.0.0.0 0 32768 i
>> >>* i137.6.2.16/30 137.6.2.9 0 100 0 i
>> >>*> 137.6.3.3/32 0.0.0.0 0 32768 i
>> >>* 137.6.3.16/28 137.6.3.18 0 0 300 i
>> >>*> 0.0.0.0 0 32768 i
>> >>
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