From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Mon Mar 28 2005 - 15:29:54 GMT-3
This is as per RFC 2328 (OSPF Version 2).
12.4.1.4. Describing Point-to-MultiPoint interfaces
For operational Point-to-MultiPoint interfaces, one or
more link descriptions are added to the router-LSA as
follows:
o A single Type 3 link (stub network) is added with
Link ID set to the router's own IP interface
address, Link Data set to the mask 0xffffffff
(indicating a host route), and cost set to 0.
o For each fully adjacent neighbor associated with the
interface, add an additional Type 1 link (point-to-
point) with Link ID set to the Router ID of the
neighboring router, Link Data set to the IP
interface address and cost equal to the interface's
configured output cost.
As you can see the RFC does not say anything about advertising
out the network, just the /32's.
http://www.internetworkexpert.com/rfc/rfc2328.txt
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jongsoo kim
Sent: Monday, March 28, 2005 10:21 AM
To: ccielab@groupstudy.com
Subject: Having a problem w/ OPSF point-to-multicast
Groups
I was doing some lab and found out something strange of OPSF
point-to-multicast.
R1 is Hub, R4 and R2 are spokes.
R3-------R1( Hub) .1--------.2 R2( spoke 1),
| |
| |
| .4
Rip --------------.4 R4( spoke2)
R1,R2, and R4 are OSPF A 0 (172.16.124.0/24)
R1 and R3 are OSPF A 13.
R3 and R4 are running rip.(172.16.34.0/24)
Since OPSF p2m is configured, I saw /32 routes on routing table.
Every OSPF and Rip are working fine....So far so good.
But When I do show ip route on R3,
I saw /32 host routes of R1,R2,R4(172.16.124.1, 2 ,4) are via OSPF
But 172.16.124.0/24 are learned by Rip.
This indicates me OSPF p2m only annouced /32 host route but the subnet
itself.
But I don't believe this is correct.
What am I missing ?
Here is output of R3 and
see "R 172.16.124.0/24 [120/1] via 172.16.34.4, 00:00:12,
FastEthernet0/1"
------------------------------R3------------------------------
R3#show ip route
Codes: C - connected, S - static, 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
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
70.0.0.0/24 is subnetted, 1 subnets
B 70.70.70.0 [200/0] via 172.16.36.6, 00:09:14
172.16.0.0/16 is variably subnetted, 19 subnets, 4 masks
C 172.16.140.0/22 is directly connected, Loopback1
O E2 172.16.25.32/27 [110/20] via 172.16.13.1, 00:00:39, Serial0/0
C 172.16.36.0/22 is directly connected, FastEthernet0/0
C 172.16.32.0/22 is directly connected, FastEthernet0/1
O E2 172.16.25.0/27 [110/20] via 172.16.13.1, 00:00:39, Serial0/0
D 172.16.16.0/24 [90/30208] via 172.16.36.6, 00:10:57,
FastEthernet0/0
O E2 172.16.17.0/24 [110/20] via 172.16.13.1, 00:00:40, Serial0/0
O IA 172.16.12.0/24 [110/1626] via 172.16.13.1, 00:10:48, Serial0/0
C 172.16.13.0/24 is directly connected, Serial0/0
R 172.16.124.0/24 [120/1] via 172.16.34.4, 00:00:12,
FastEthernet0/1
O 172.16.124.1/32 [110/64] via 172.16.13.1, 00:10:48, Serial0/0
O 172.16.124.2/32 [110/64] via 172.16.13.1, 00:10:48, Serial0/0
O 172.16.124.4/32 [110/128] via 172.16.13.1, 00:10:48, Serial0/0
R 172.16.120.0/24 [105/1] via 172.16.34.10, 00:00:02,
FastEthernet0/1
O 172.16.124.5/32 [110/128] via 172.16.13.1, 00:10:48, Serial0/0
O 172.16.104.0/24 [110/129] via 172.16.13.1, 00:10:48, Serial0/0
O E2 172.16.105.0/27 [110/20] via 172.16.13.1, 00:00:40, Serial0/0
D 172.16.106.0/24 [90/156160] via 172.16.36.6, 00:10:57,
FastEthernet0/0
C 172.16.103.0/24 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
R 10.10.10.0 [120/1] via 172.16.34.4, 00:00:13, FastEthernet0/1
Thanks
Jongsoo
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