From: Stephen Oliver (stevie_oliver@xxxxxxxxxxx)
Date: Mon Dec 31 2001 - 10:53:51 GMT-3
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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