From: Omer Ansari (omer@xxxxxxxxxx)
Date: Tue Jul 30 2002 - 19:44:53 GMT-3
Hunt,
my previous post did not solve the issue as i thought it would.
however, after much deliberation, and searching google:
http://www.groupstudy.com/archives/ccielab/200204/msg00018.html
On Tue, 30 Jul 2002, Omer Ansari wrote:
> Hunt,
> I was able to replicate this issue.
>
> The problem is resolved by putting ip ospf network point-to-point on the
> loopback interfaces for those /32 networks
>
> that evidently produces a summary net link lsa for those networks as seen
> in show ip ospf database which was not there prior to putting the command
> in.
>
>
> On Sun, 28 Jul 2002, [iso-8859-1] Hunt Lee wrote:
>
> > Hi all,
> >
> > 1.1.1.1/32 - RTB RTE - 3.3.3.3/32
> > \ /
> > RTA -- RTD
> > / \
> > 2.2.2.2/32 - RTC RTF - 4.4.4.4/32
> >
> >
> > All routers are in AS 1, and the 1.1.1.1/32, 2.2.2.2/32, 3.3.3.3/32 &
> > 4.4.4.4/32 are being advertised by BGP's network command (all 4 of
> > them are loopback interfaces created on respective routers).
> >
> > RTA & RTD are Route Reflector, in which RTB & RTC are RR client of
> > RTA, and RTE & RTF are RR client of RTD.
> >
> > OSPF is running on all routers (also covers those 4 networks
> > advertised by BGP).
> >
> > The neighbor update-source command has been used to establish BGP
> > connections. The IP address that each router uses is:-
> >
> > RTA - 172.16.1.1
> > RTB - 172.16.1.2
> > RTC - 172.16.1.3
> >
> > RTD - 172.17.1.1
> > RTE - 172.17.1.2
> > RTF - 172.17.1.3
> >
> >
> > With Synchorization turned on at all routers... I found that each RR
> > client cannot sync. the BGP route from the other RR Client, who is a
> > member of the same Route Reflector.
> >
> > RouterB#sh ip bgp
> > BGP table version is 28, local router ID is 172.16.1.2
> > 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
> > *> 1.1.1.1/32 0.0.0.0 0 32768 i
> > * i2.2.2.2/32 172.16.1.3 0 100 0 i
> > *>i3.3.3.3/32 172.17.1.2 0 100 0 i
> > *>i4.4.4.4/32 172.17.1.3 0 100 0 i
> > *>i10.1.1.0/30 172.16.1.1 0 100 0 i
> > *>i10.1.2.0/30 172.16.1.1 0 100 0 i
> > *>i20.1.1.0/24 172.16.1.1 0 100 0 i
> > *>i30.1.1.0/30 172.17.1.1 0 100 0 i
> > *>i30.1.2.0/30 172.17.1.1 0 100 0 i
> >
> >
> > RouterB#sh ip bgp 2.2.2.2/32
> > BGP routing table entry for 2.2.2.2/32, version 0
> > Paths: (1 available, no best path)
> > Not advertised to any peer
> > Local
> > 172.16.1.3 (metric 129) from 172.16.1.1 (172.16.1.1)
> > Origin IGP, metric 0, localpref 100, valid, internal, not
> > synchronized
> > Originator: 172.16.1.3, Cluster list: 172.16.1.1
> >
> >
> > RouterB#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
> >
> > 1.0.0.0/32 is subnetted, 1 subnets
> > C 1.1.1.1 is directly connected, Loopback5
> > 2.0.0.0/32 is subnetted, 1 subnets
> > O 2.2.2.2 [110/129] via 10.1.1.1, 01:24:29, Serial0
> > 3.0.0.0/32 is subnetted, 1 subnets
> > O IA 3.3.3.3 [110/139] via 10.1.1.1, 00:59:54, Serial0
> > 4.0.0.0/32 is subnetted, 1 subnets
> > O IA 4.4.4.4 [110/139] via 10.1.1.1, 00:57:52, Serial0
> > 20.0.0.0/24 is subnetted, 1 subnets
> > O IA 20.1.1.0 [110/74] via 10.1.1.1, 01:24:29, Serial0
> > 172.17.0.0/32 is subnetted, 3 subnets
> > O IA 172.17.1.1 [110/75] via 10.1.1.1, 01:24:28, Serial0
> > O IA 172.17.1.2 [110/139] via 10.1.1.1, 01:24:28, Serial0
> > O IA 172.17.1.3 [110/139] via 10.1.1.1, 01:24:03, Serial0
> > 172.16.0.0/32 is subnetted, 3 subnets
> > O IA 172.16.1.1 [110/65] via 10.1.1.1, 01:24:30, Serial0
> > O 172.16.1.3 [110/129] via 10.1.1.1, 01:24:30, Serial0
> > C 172.16.1.2 is directly connected, Loopback1
> > 10.0.0.0/30 is subnetted, 2 subnets
> > O 10.1.2.0 [110/128] via 10.1.1.1, 01:24:30, Serial0
> > C 10.1.1.0 is directly connected, Serial0
> > 30.0.0.0/30 is subnetted, 2 subnets
> > O IA 30.1.2.0 [110/138] via 10.1.1.1, 01:24:13, Serial0
> > O IA 30.1.1.0 [110/138] via 10.1.1.1, 01:24:29, Serial0
> > RouterB#
> >
> >
> > RouterC#sh ip bgp
> > BGP table version is 28, local router ID is 172.16.1.3
> > 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
> > * i1.1.1.1/32 172.16.1.2 0 100 0 i
> > *> 2.2.2.2/32 0.0.0.0 0 32768 i
> > *>i3.3.3.3/32 172.17.1.2 0 100 0 i
> > *>i4.4.4.4/32 172.17.1.3 0 100 0 i
> > *>i10.1.1.0/30 172.16.1.1 0 100 0 i
> > *>i10.1.2.0/30 172.16.1.1 0 100 0 i
> > *>i20.1.1.0/24 172.16.1.1 0 100 0 i
> > *>i30.1.1.0/30 172.17.1.1 0 100 0 i
> > *>i30.1.2.0/30 172.17.1.1 0 100 0 i
> >
> > RouterC#sh ip bgp 1.1.1.1/32
> > BGP routing table entry for 1.1.1.1/32, version 0
> > Paths: (1 available, no best path)
> > Not advertised to any peer
> > Local
> > 172.16.1.2 (metric 129) from 172.16.1.1 (172.16.1.1)
> > Origin IGP, metric 0, localpref 100, valid, internal, not
> > synchronized
> > Originator: 172.16.1.2, Cluster list: 172.16.1.1
> > RouterC#
> >
> >
> > RouterC#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
> >
> > 1.0.0.0/32 is subnetted, 1 subnets
> > O 1.1.1.1 [110/129] via 10.1.2.1, 01:20:36, Serial0
> > 2.0.0.0/32 is subnetted, 1 subnets
> > C 2.2.2.2 is directly connected, Loopback5
> > 3.0.0.0/32 is subnetted, 1 subnets
> > O IA 3.3.3.3 [110/139] via 10.1.2.1, 00:57:23, Serial0
> > 4.0.0.0/32 is subnetted, 1 subnets
> > O IA 4.4.4.4 [110/139] via 10.1.2.1, 00:55:22, Serial0
> > 20.0.0.0/24 is subnetted, 1 subnets
> > O IA 20.1.1.0 [110/74] via 10.1.2.1, 01:20:36, Serial0
> > 172.17.0.0/32 is subnetted, 3 subnets
> > O IA 172.17.1.1 [110/75] via 10.1.2.1, 01:20:37, Serial0
> > O IA 172.17.1.2 [110/139] via 10.1.2.1, 01:20:37, Serial0
> > O IA 172.17.1.3 [110/139] via 10.1.2.1, 01:20:38, Serial0
> > 172.16.0.0/32 is subnetted, 3 subnets
> > O IA 172.16.1.1 [110/65] via 10.1.2.1, 01:20:38, Serial0
> > C 172.16.1.3 is directly connected, Loopback2
> > O 172.16.1.2 [110/129] via 10.1.2.1, 01:20:38, Serial0
> > 10.0.0.0/30 is subnetted, 2 subnets
> > C 10.1.2.0 is directly connected, Serial0
> > O 10.1.1.0 [110/128] via 10.1.2.1, 01:20:38, Serial0
> > 30.0.0.0/30 is subnetted, 2 subnets
> > O IA 30.1.2.0 [110/138] via 10.1.2.1, 01:20:38, Serial0
> > O IA 30.1.1.0 [110/138] via 10.1.2.1, 01:20:38, Serial0
> > RouterC#
> >
> >
> > However, all is good at the Route Reflector (i.e. RTA)
> >
> > RouterA#sh ip bgp
> > BGP table version is 29, local router ID is 172.16.1.1
> > 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
> > *>i1.1.1.1/32 172.16.1.2 0 100 0 i
> > *>i2.2.2.2/32 172.16.1.3 0 100 0 i
> > *>i3.3.3.3/32 172.17.1.2 0 100 0 i
> > *>i4.4.4.4/32 172.17.1.3 0 100 0 i
> > *> 10.1.1.0/30 0.0.0.0 0 32768 i
> > *> 10.1.2.0/30 0.0.0.0 0 32768 i
> > * i20.1.1.0/24 172.17.1.1 0 100 0 i
> > *> 0.0.0.0 0 32768 i
> > *>i30.1.1.0/30 172.17.1.1 0 100 0 i
> > *>i30.1.2.0/30 172.17.1.1 0 100 0 i
> >
> >
> > RouterA#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
> >
> > 1.0.0.0/32 is subnetted, 1 subnets
> > O 1.1.1.1 [110/65] via 10.1.1.2, 01:20:33, Serial1
> > 2.0.0.0/32 is subnetted, 1 subnets
> > O 2.2.2.2 [110/65] via 10.1.2.2, 01:20:33, Serial0
> > 3.0.0.0/32 is subnetted, 1 subnets
> > O IA 3.3.3.3 [110/75] via 20.1.1.2, 00:56:11, Ethernet0
> > 4.0.0.0/32 is subnetted, 1 subnets
> > O IA 4.4.4.4 [110/75] via 20.1.1.2, 00:54:10, Ethernet0
> > 20.0.0.0/24 is subnetted, 1 subnets
> > C 20.1.1.0 is directly connected, Ethernet0
> > 172.17.0.0/32 is subnetted, 3 subnets
> > O 172.17.1.1 [110/11] via 20.1.1.2, 01:20:34, Ethernet0
> > O IA 172.17.1.2 [110/75] via 20.1.1.2, 01:20:12, Ethernet0
> > O IA 172.17.1.3 [110/75] via 20.1.1.2, 01:20:08, Ethernet0
> > 172.16.0.0/32 is subnetted, 3 subnets
> > C 172.16.1.1 is directly connected, Loopback0
> > O 172.16.1.3 [110/65] via 10.1.2.2, 01:20:34, Serial0
> > O 172.16.1.2 [110/65] via 10.1.1.2, 01:20:34, Serial1
> > 10.0.0.0/30 is subnetted, 2 subnets
> > C 10.1.2.0 is directly connected, Serial0
> > C 10.1.1.0 is directly connected, Serial1
> > 30.0.0.0/30 is subnetted, 2 subnets
> > O IA 30.1.2.0 [110/74] via 20.1.1.2, 01:20:13, Ethernet0
> > O IA 30.1.1.0 [110/74] via 20.1.1.2, 01:20:13, Ethernet0
> >
> >
> > My guess is that, from the view of RTB, the OSPF originator ID of the
> > route 2.2.2.2/32 is RTC (172.16.1.3), which is different than RTB's
> > IBGP Neighbor IP (RTA - 172.16.1.1). My question is, apart from
> > turning off sync at all the RR client routers (RTB, C, E & F). Is
> > there another way I could do this??
> >
> > Thank you in advance,
> >
> > H.
> >
> >
> > http://digital.yahoo.com.au - Yahoo! Digital How To
> > - Get the best out of your PC!
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