From: Bob Sinclair (bsin@cox.net)
Date: Wed Nov 26 2003 - 19:44:35 GMT-3
John,
Not sure of your problem, but, if you have not seen it, here is a great
article that directly addresses your question. It is titled: "Why are some
OSPF Routes in the Database but not in the Routing Table?
http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a008009481a.shtml
HTH,
-Bob Sinclair
CCIE #10427, CISSP, MCSE
bsinclair@netmasterclass.net
----- Original Message -----
From: "John Underhill" <stepnwlf@magma.ca>
To: "ccielab Groupstudy" <ccielab@groupstudy.com>
Sent: Wednesday, November 26, 2003 5:30 PM
Subject: Disappearing route
> P2M --R4
> /
> area 0 / VL area 1 area 2
> R1--R2 ---- P2M -R5 --- P2P --R7
> \
> \
> P2P--R6
>
> I have this config that I can't seem to make sense of.. Area 0 is on hdlc
> between r1 and r2. Area 1 is between a point to multipoint link on R2 to
the
> ser0 of r4 and r5. A p2p connection between r6 and r2. There is a virtual
link
> using r2 to r5 as the transit area. The serial1 is connected via ppp to
the s0
> of r7 in area 2. I am not using any authentication. Now here's the strange
> part. R7 sees all the routes, can ping all of them but the multipoint int
on
> r2, (coming up as a host route with p2m). R2 does not see routes injected
via
> R7 at all, but, they are showing up in the ospf database, just not in the
> route table. All other routers have full connectivity. R7 can ping r5, and
all
> other interfaces, including those that have to pass through the hub to
reach
> the end spokes. R2 in turn can ping everything up to r5. A trace shows r7
gets
> to r5 then the route is blackholed. Debugs show only a normal adjacency
> forming between routers involved. I think it might have something to do
with
> the VL. or a route summary. not sure, but one thing I wonder is how a
route
> can show up in the ospf database and not be installed in the route table..
> here's my configs..
>
> R2
> O 205.1.1.0/24 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
> O 206.1.1.0/24 [110/65] via 13.1.1.2, 00:31:22, Serial0.2
> 172.18.0.0/18 is subnetted, 4 subnets
> O 172.18.128.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
> O 172.18.192.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
> O 172.18.0.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
> O 172.18.64.0 [110/65] via 12.1.1.5, 00:31:22, Serial0.1
> C 202.1.1.0/24 is directly connected, Loopback0
> 12.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
> O 12.1.1.4/32 [110/64] via 12.1.1.4, 00:31:22, Serial0.1
> O 12.1.1.5/32 [110/64] via 12.1.1.5, 00:31:22, Serial0.1
> C 12.1.1.0/24 is directly connected, Serial0.1
> 13.0.0.0/30 is subnetted, 1 subnets
> C 13.1.1.0 is directly connected, Serial0.2
> 150.50.0.0/16 is variably subnetted, 4 subnets, 2 masks
> C 150.50.1.0/24 is directly connected, Serial1
> C 150.50.9.0/24 is directly connected, Dialer0
> C 150.50.9.2/32 is directly connected, Dialer0
> C 150.50.17.0/24 is directly connected, Ethernet0
>
> interface Loopback0
> ip address 202.1.1.1 255.255.255.0
> interface Serial0.1 multipoint
> ip address 12.1.1.2 255.255.255.0
> ip ospf network point-to-multipoint
> frame-relay map ip 12.1.1.4 101 broadcast
> frame-relay map ip 12.1.1.5 102 broadcast
> !
> interface Serial0.2 point-to-point
> ip address 13.1.1.1 255.255.255.252
> frame-relay interface-dlci 103
> router ospf 100
> router-id 202.1.1.1
> log-adjacency-changes
> area 1 virtual-link 205.1.1.1
> passive-interface default
> no passive-interface Serial0.1
> no passive-interface Serial0.2
> no passive-interface Serial1
> network 12.1.1.0 0.0.0.255 area 1
> network 13.1.1.0 0.0.0.3 area 1
> network 150.50.1.0 0.0.0.255 area 0
> r5
>
> C 205.1.1.0/24 is directly connected, Loopback0
> O 207.1.1.0/24 [110/65] via 150.50.18.7, 00:32:48, Serial1
> O 206.1.1.0/24 [110/129] via 12.1.1.2, 00:32:48, Serial0
> 172.16.0.0/24 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected, TokenRing0
> 172.18.0.0/16 is variably subnetted, 5 subnets, 2 masks
> C 172.18.128.0/18 is directly connected, Loopback3
> C 172.18.192.0/18 is directly connected, Loopback4
> S 172.18.0.0/16 is directly connected, Null0
> C 172.18.0.0/18 is directly connected, Loopback1
> C 172.18.64.0/18 is directly connected, Loopback2
> 12.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
> O 12.1.1.4/32 [110/64] via 12.1.1.4, 00:32:48, Serial0
> C 12.1.1.0/24 is directly connected, Serial0
> O 12.1.1.2/32 [110/64] via 12.1.1.2, 00:32:50, Serial0
> 13.0.0.0/30 is subnetted, 1 subnets
> O 13.1.1.0 [110/128] via 12.1.1.2, 00:32:50, Serial0
> 150.50.0.0/16 is variably subnetted, 5 subnets, 2 masks
> O IA 150.50.1.0/24 [110/192] via 12.1.1.2, 00:32:50, Serial0
> C 150.50.9.1/32 is directly connected, Dialer0
> C 150.50.9.0/24 is directly connected, Dialer0
> C 150.50.18.7/32 is directly connected, Serial1
> C 150.50.18.0/24 is directly connected, Serial1
>
> interface Loopback0
> ip address 205.1.1.1 255.255.255.0
> ip ospf network point-to-point
> !
> interface Loopback1
> ip address 172.18.0.1 255.255.192.0
> ip ospf network point-to-point
> !
> interface Loopback2
> ip address 172.18.64.1 255.255.192.0
> ip ospf network point-to-point
> !
> interface Loopback3
> ip address 172.18.128.1 255.255.192.0
> ip ospf network point-to-point
> !
> interface Loopback4
> ip address 172.18.224.1 255.255.192.0
> ip ospf network point-to-point
>
> interface Serial0
> ip address 12.1.1.5 255.255.255.0
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> no fair-queue
> frame-relay map ip 12.1.1.2 301 broadcast
>
> router ospf 100
> log-adjacency-changes
> area 1 range 172.18.0.0 255.255.0.0
> area 1 virtual-link 202.1.1.1
> passive-interface default
> no passive-interface Loopback0
> no passive-interface Serial0
> no passive-interface Serial1
> network 12.1.1.0 0.0.0.255 area 1
> network 150.50.18.0 0.0.0.255 area 2
> network 172.18.0.0 0.0.63.255 area 1
> network 172.18.64.0 0.0.63.255 area 1
> network 172.18.128.0 0.0.63.255 area 1
> network 172.18.192.0 0.0.63.255 area 1
> network 205.1.1.0 0.0.0.255 area 1
> !
> ip classless
> ip route 172.18.0.0 255.255.0.0 Null0
> ip http server
>
> r7
>
> O IA 205.1.1.0/24 [110/65] via 150.50.18.5, 00:33:33, Serial0
> C 207.1.1.0/24 is directly connected, Loopback0
> O IA 206.1.1.0/24 [110/193] via 150.50.18.5, 00:33:33, Serial0
> O IA 172.18.0.0/16 [110/65] via 150.50.18.5, 00:33:33, Serial0
> 12.0.0.0/32 is subnetted, 3 subnets
> O IA 12.1.1.4 [110/128] via 150.50.18.5, 00:33:33, Serial0
> O IA 12.1.1.5 [110/64] via 150.50.18.5, 00:33:33, Serial0
> O IA 12.1.1.2 [110/128] via 150.50.18.5, 00:33:34, Serial0
> 13.0.0.0/30 is subnetted, 1 subnets
> O IA 13.1.1.0 [110/192] via 150.50.18.5, 00:33:34, Serial0
> 150.50.0.0/16 is variably subnetted, 4 subnets, 2 masks
> C 150.50.5.0/24 is directly connected, Serial1
> C 150.50.18.5/32 is directly connected, Serial0
> C 150.50.17.0/24 is directly connected, Ethernet0
> C 150.50.18.0/24 is directly connected, Serial0
>
> interface Loopback0
> ip address 207.1.1.1 255.255.255.0
> no ip directed-broadcast
> ip ospf network point-to-point
>
> interface Serial0
> ip address 150.50.18.7 255.255.255.0
> no ip directed-broadcast
> encapsulation ppp
> no fair-queue
> !
> interface Serial1
> ip address 150.50.5.68 255.255.255.0
> no ip directed-broadcast
> !
> interface Async1
> no ip address
> no ip directed-broadcast
> shutdown
> !
> router ospf 100
> passive-interface default
> no passive-interface Loopback0
> no passive-interface Serial0
> network 150.50.18.0 0.0.0.255 area 2
> network 207.1.1.0 0.0.0.255 area 2
>
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This archive was generated by hypermail 2.1.4 : Fri Dec 12 2003 - 12:29:18 GMT-3