From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Tue Mar 21 2006 - 03:53:25 GMT-3
Hello List, playing for a while the behavior of ip ospf network p2mp
I found this on one off the routers
Rack1R6#
*Mar 30 19:15:22.377: RT: del 4.4.4.4/32 via 136.1.245.5, ospf metric
[110/129]
*Mar 30 19:15:22.377: RT: SET_LAST_RDB for 4.4.4.4/32
OLD rdb: via 11.13.11.13
*Mar 30 19:15:22.377: RT: SET_LAST_RDB for 4.4.4.4/32
NEW rdb: via 136.1.245.4
*Mar 30 19:15:22.377: RT: add 4.4.4.4/32 via 136.1.245.4, ospf metric
[110/65]
*Mar 30 19:15:22.377: RT: NET-RED 4.4.4.4/32
*Mar 30 19:15:22.381: RT: del 136.1.245.4/32 via 136.1.245.5, ospf
metric [110/128]
*Mar 30 19:15:22.381: RT: SET_LAST_RDB for 136.1.245.4/32
OLD rdb: via 11.13.11.13
*Mar 30 19:15:22.381: RT: SET_LAST_RDB for 136.1.245.4/32
NEW rdb: via 136.1.245.4
*Mar 30 19:15:22.381: RT:
Rack1R6#add 136.1.245.4/32 via 136.1.245.4, ospf metric [110/64]
*Mar 30 19:15:22.381: RT: NET-RED 136.1.245.4/32
Rack1R6#
Rack1R6#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, su - IS-IS summary, 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
136.1.0.0/16 is variably subnetted, 5 subnets, 2 masks
C 136.1.136.0/24 is directly connected, BVI1
O 136.1.245.4/32 [110/64] via 136.1.245.4, 00:04:08, Serial0/0.245
O 136.1.245.5/32 [110/64] via 136.1.245.5, 00:04:08, Serial0/0.245
C 136.1.245.0/24 is directly connected, Serial0/0.245
O 136.1.245.2/32 [110/128] via 136.1.245.5, 00:04:08, Serial0/0.245
C 204.12.1.0/24 is directly connected, FastEthernet0/0.63
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/65] via 136.1.245.4, 00:04:09, Serial0/0.245
6.0.0.0/32 is subnetted, 1 subnets
C 6.6.6.6 is directly connected, Loopback0
C 192.10.1.0/24 is directly connected, Serial0/0.1
This is strange, if you look at the routing table for instance, looking
for the network 4.4.4.4
You can say ok, It does a reverse lookup to 136.1.245.4
But now take a look at this output
*Mar 30 19:15:22.381: RT: del 136.1.245.4/32 via 136.1.245.5, ospf
metric [110/128]
*Mar 30 19:15:22.381: RT: SET_LAST_RDB for 136.1.245.4/32
OLD rdb: via 11.13.11.13
Now, ok Where in the hell is that network??
11.13.11.13 ??
Rack1R6#show ip route 11.13.11.13
% Network not in table
Rack1R6#
??
Rack1R6#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
4.4.4.4 0 FULL/ - 00:01:41 136.1.245.4
Serial0/0.245
5.5.5.5 0 FULL/ - 00:01:53 136.1.245.5
Serial0/0.245
C1700 Software (C1700-K9O3SY7-M), Version 12.4(2)T3
Thanks for any information
Victor.
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