From: steve.skinner@uk.pwc.com
Date: Wed Mar 09 2005 - 13:49:30 GMT-3
are these networks only being advertised in BGP.
from the look of the routing tables they are coming from another ospf area
?
i think you have a loop .
from what i can tell in the BGP it say`s
i197.68.1.0 3.3.2.2 100 0 4 254 i
this network is coming from router 3.3.2.2 which i think is also
197.68.1.0/24 [110/2000] via 3.3.125.2,
YES ?
if that is the case then the route`s are coming from r2 via ospf and also
r2 via bgp..
can you post the config`s of R1 and R2 please
Stephen Skinner
"Dillon Yang"
<gzdillon@hotmail.c To: Steve Skinner/UK/GTS/PwC@EMEA-UK
om> cc: "Group Study" <ccielab@groupstudy.com>
Sent by: Subject: Re: BGP reflector Non-directed client
nobody@groupstudy.c
om
09/03/2005 16:00
Please respond to
"Dillon Yang"
Hi, steve:
Thanks for you fast reply.
Before this config, I want to do a "sync" AS 3, to let the whole IGP to
know the routes, I redistributed the BGP routes into IGP, but I failed in
advertising them to next AS. Then I removed the "sync" BGP command, and
now, it still did not work.
If I want to use "sync", how can I perform it in the case?
TIA
dillon
----- Original Message -----
From: <steve.skinner@uk.pwc.com>
To: "Dillon Yang" <gzdillon@hotmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, March 09, 2005 11:15 PM
Subject: Re: BGP reflector Non-directed client
>
> you are getting a rib failure because the routes in your bgp table are
> already advertised via an IGP
>
> as you can see on R1
>
> R1 BGP table
>
> Network Next Hop Metric LocPrf Weight Path
> r>i197.68.1.0 3.3.2.2 100 0 4 254 i
> r>i197.68.4.0 3.3.2.2 100 0 4 254 i
> r>i197.68.5.0 3.3.2.2 100 0 4 254 i
> *> 200.200.200.0 0.0.0.0 0 32768 i
> r>i200.200.201.0 3.3.5.5 0 100 0 6 i
>
> R1 route table
> O E2 197.68.1.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> O E2 197.68.5.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> O E2 197.68.4.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> C 200.200.200.0/24 is directly connected, Loopback200
> O E2 200.200.201.0/24 [110/2000] via 3.3.125.5, 00:17:44, Serial0
> 3.0.0.0/24 is subnetted, 8 subnets
>
> check your level of IOS as this is dependant on the level
>
> CSCdx26714
> >
> > 1. Symptom :
> >
> > If the prefix get Rib-Failre when installing into bgp table because
of
> > there is already has a prefix in the routing table with a prefered
> admin
> > distance (like already learnd by ospf), then this prefix should not
be
> > advertised to other bgp peers unless the next-hop is the same as the
> > prefix
> > in the ip routing table.
> > But the behavior is that even if the next-hop is the same, this
> > prefix still
> > does not advertise to it's bgp peers.
> >
> > 2. Conditions :
> >
> > You should see the bgp prefix get a "Rib-Failure" in the output of
> > "show ip bgp <x.x.x.x> ". This will confirm that this prefix fails
to
> > install into the routing table. Then check the next-hop for the bgp
> > prefix
> > and the prefix that already in the ip table (it's ospf in this
ddts).
> If
> > they are the same, then bgp should still advertise this prfix to
it's
> bgp
> > peers.
> >
> > 3. Workaround :
> >
> > Thers is not workaround for this problem.
>
>
> Stephen Skinner
>
>
>
>
>
> "Dillon Yang"
> <gzdillon@hotmail.c To: "Group Study"
<ccielab@groupstudy.com>
> om> cc:
> Sent by: Subject: BGP reflector
Non-directed client
> nobody@groupstudy.c
> om
>
>
> 09/03/2005 13:15
>
>
> Please respond to
> "Dillon Yang"
>
>
>
>
>
>
> Hi, folks:
>
> In a case, the topology is :
>
> R1(reflector)
> |
> FR
> |
> R5(Hub)----------R6(AS6)
> |
> FR
> |
> R2---------------R4(AS4)
>
> R1, R2, R5 are in AS 3, The R2 and R5 can not receive external routes
from
> R1. Why?
>
> TIA
> dillon
>
>
> ***************************************************
> Changing Router to 3.3.1.1
> r1#s ip bgp
> BGP table version is 10, local router ID is 3.3.1.1
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
> r>i197.68.1.0 3.3.2.2 100 0 4 254 i
> r>i197.68.4.0 3.3.2.2 100 0 4 254 i
> r>i197.68.5.0 3.3.2.2 100 0 4 254 i
> *> 200.200.200.0 0.0.0.0 0 32768 i
> r>i200.200.201.0 3.3.5.5 0 100 0 6 i
>
> s ip bgp 197.68.1.0
> BGP routing table entry for 197.68.1.0/24, version 7
> Paths: (1 available, best #1, table Default-IP-Routing-Table,
> RIB-failure(17))
> Not advertised to any peer
> 4 254, (Received from a RR-client)
> 3.3.2.2 (metric 801) from 3.3.2.2 (3.3.2.2)
> Origin IGP, localpref 100, valid, internal, best
>
>
> s ip bgp 200.200.201.0
> BGP routing table entry for 200.200.201.0/24, version 3
> Paths: (1 available, best #1, table Default-IP-Routing-Table,
> RIB-failure(17))
> Not advertised to any peer
> 6, (Received from a RR-client)
> 3.3.5.5 (metric 801) from 3.3.5.5 (3.3.2.2)
> Origin IGP, metric 0, localpref 100, valid, internal, best
>
> r1#s ip os nei
>
> Neighbor ID Pri State Dead Time Address
Interface
> 3.3.5.5 1 FULL/DR 00:01:53 3.3.125.5 Serial0
>
> s ip route | be Gateway
> Gateway of last resort is not set
>
> C 200.200.200.0/24 is directly connected, Loopback200
> O E2 200.200.201.0/24 [110/2000] via 3.3.125.5, 00:17:44, Serial0
> 3.0.0.0/24 is subnetted, 8 subnets
> C 3.3.1.0 is directly connected, Loopback0
> O 3.3.2.0 [110/801] via 3.3.125.2, 00:34:03, Serial0
> O E2 3.3.4.0 [110/5000] via 3.3.125.2, 00:34:03, Serial0
> O 3.3.5.0 [110/801] via 3.3.125.5, 00:34:03, Serial0
> O E2 3.3.6.0 [110/2000] via 3.3.125.5, 00:34:03, Serial0
> O E2 3.3.24.0 [110/4000] via 3.3.125.2, 00:34:03, Serial0
> O E2 3.3.56.0 [110/2000] via 3.3.125.5, 00:34:03, Serial0
> C 3.3.125.0 is directly connected, Serial0
> 4.0.0.0/24 is subnetted, 1 subnets
> O E2 4.4.4.0 [110/2000] via 3.3.125.5, 00:34:03, Serial0
> O E2 197.68.1.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> O E2 197.68.5.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> O E2 197.68.4.0/24 [110/2000] via 3.3.125.2, 00:17:26, Serial0
> O E2 192.3.2.0/24 [110/2000] via 3.3.125.5, 00:34:03, Serial0
> 150.100.0.0/24 is subnetted, 1 subnets
> O E2 150.100.2.0 [110/5000] via 3.3.125.2, 00:34:03, Serial0
>
>
> s run | be router bgp
> router bgp 3
> no synchronization
> bgp router-id 3.3.1.1
> bgp log-neighbor-changes
> network 200.200.200.0
> neighbor 3.3.2.2 remote-as 3
> neighbor 3.3.2.2 update-source Loopback0
> neighbor 3.3.2.2 route-reflector-client
> neighbor 3.3.5.5 remote-as 3
> neighbor 3.3.5.5 update-source Loopback0
> neighbor 3.3.5.5 route-reflector-client
> no auto-summary
>
> ***************************************************
> Changing Router to 3.3.2.2
> s ip bgp 197.68.1.0
> BGP routing table entry for 197.68.1.0/24, version 2
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
> Advertised to non peer-group peers:
> 3.3.1.1
> 4 254
> 3.3.4.4 (metric 1) from 3.3.4.4 (3.3.4.4)
> Origin IGP, localpref 100, valid, external, best
>
>
> s ip bgp 200.200.201.0
>
> % Network not in table
> r2#s ip os nei
>
> Neighbor ID Pri State Dead Time Address
Interface
> 3.3.5.5 1 FULL/DR 00:01:43 3.3.125.5 Serial0
> r2#
>
> s ip route | be Gateway
> Gateway of last resort is not set
>
> O E2 200.200.200.0/24 [110/2000] via 3.3.125.1, 00:30:36, Serial0
> O E2 200.200.201.0/24 [110/2000] via 3.3.125.5, 00:17:55, Serial0
> 3.0.0.0/24 is subnetted, 8 subnets
> O 3.3.1.0 [110/801] via 3.3.125.1, 00:30:36, Serial0
> C 3.3.2.0 is directly connected, Loopback0
> R 3.3.4.0 [120/1] via 3.3.24.4, 00:00:26, Serial1
> O 3.3.5.0 [110/801] via 3.3.125.5, 00:30:36, Serial0
> O E2 3.3.6.0 [110/2000] via 3.3.125.5, 00:30:36, Serial0
> C 3.3.24.0 is directly connected, Serial1
> O E2 3.3.56.0 [110/2000] via 3.3.125.5, 00:30:36, Serial0
> C 3.3.125.0 is directly connected, Serial0
> 4.0.0.0/24 is subnetted, 1 subnets
> O E2 4.4.4.0 [110/2000] via 3.3.125.5, 00:30:36, Serial0
> B 197.68.1.0/24 [20/0] via 3.3.4.4, 00:17:37
> B 197.68.5.0/24 [20/0] via 3.3.4.4, 00:17:37
> B 197.68.4.0/24 [20/0] via 3.3.4.4, 00:17:37
> O E2 192.3.2.0/24 [110/2000] via 3.3.125.5, 00:30:36, Serial0
> 150.100.0.0/24 is subnetted, 1 subnets
> R 150.100.2.0 [120/1] via 3.3.24.4, 00:00:26, Serial1
>
>
> s run | be router bgp
> router bgp 3
> no synchronization
> bgp router-id 3.3.2.2
> bgp log-neighbor-changes
> neighbor 3.3.1.1 remote-as 3
> neighbor 3.3.1.1 update-source Loopback0
> neighbor 3.3.1.1 next-hop-self
> neighbor 3.3.4.4 remote-as 4
> neighbor 3.3.4.4 ebgp-multihop 255
> neighbor 3.3.4.4 update-source Loopback0
> no auto-summary
> !
>
> ***************************************************
> Changing Router to 3.3.5.5
> s ip bgp 197.68.1.0
>
> % Network not in table
>
>
> s ip bgp 200.200.201.0
> BGP routing table entry for 200.200.201.0/24, version 2
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
> Advertised to non peer-group peers:
> 3.3.1.1
> 6
> 3.3.6.6 (metric 409600) from 3.3.6.6 (3.3.6.6)
> Origin IGP, metric 0, localpref 100, valid, external, best
> r5#s ip os nei
>
> Neighbor ID Pri State Dead Time Address
Interface
> 3.3.1.1 0 FULL/DROTHER 00:01:45 3.3.125.1 Serial0
> 3.3.2.2 0 FULL/DROTHER 00:01:45 3.3.125.2 Serial0
> r5#
>
>
> s ip route | be Gateway
> Gateway of last resort is not set
>
> O E2 200.200.200.0/24 [110/2000] via 3.3.125.1, 00:34:25, Serial0
> B 200.200.201.0/24 [20/0] via 3.3.6.6, 00:18:05
> 3.0.0.0/24 is subnetted, 8 subnets
> O 3.3.1.0 [110/801] via 3.3.125.1, 00:34:25, Serial0
> O 3.3.2.0 [110/801] via 3.3.125.2, 00:34:25, Serial0
> O E2 3.3.4.0 [110/5000] via 3.3.125.2, 00:34:25, Serial0
> C 3.3.5.0 is directly connected, Loopback0
> D 3.3.6.0 [90/409600] via 3.3.56.6, 00:36:21, Ethernet0
> O E2 3.3.24.0 [110/4000] via 3.3.125.2, 00:34:25, Serial0
> C 3.3.56.0 is directly connected, Ethernet0
> C 3.3.125.0 is directly connected, Serial0
> 4.0.0.0/24 is subnetted, 1 subnets
> D EX 4.4.4.0 [170/26163200] via 3.3.56.6, 00:36:21, Ethernet0
> O E2 197.68.1.0/24 [110/2000] via 3.3.125.2, 00:17:48, Serial0
> O E2 197.68.5.0/24 [110/2000] via 3.3.125.2, 00:17:48, Serial0
> O E2 197.68.4.0/24 [110/2000] via 3.3.125.2, 00:17:48, Serial0
> D 192.3.2.0/24 [90/2195456] via 3.3.56.6, 00:36:21, Ethernet0
> 150.100.0.0/24 is subnetted, 1 subnets
> O E2 150.100.2.0 [110/5000] via 3.3.125.2, 00:34:25, Serial0
>
>
> s run | be router bgp
> router bgp 3
> no synchronization
> bgp router-id 3.3.2.2
> bgp log-neighbor-changes
> neighbor 3.3.1.1 remote-as 3
> neighbor 3.3.1.1 update-source Loopback0
> neighbor 3.3.1.1 next-hop-self
> neighbor 3.3.6.6 remote-as 6
> neighbor 3.3.6.6 ebgp-multihop 255
> neighbor 3.3.6.6 update-source Loopback0
> no auto-summary
> end
> =====================End==================
>
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