Tim,
I have also been looking into this.
As far as I know this is definate -you cannot have a the following:
Hub - ip ospf network point-to-multipoint
and
spokes - ip ospf network broadcast
( Or the other way around ) due to a mismatch in the hello packets
ala
3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8
3d00h: OSPF: Mismatched hello parameters from 10.128.10.8
3d00h: Dead R 120 C 40, Hello R 30 C 10 Mask R 255.255.255.0 C 255.255.255.0
3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8
3d00h: OSPF: Mismatched hello parameters from 10.128.10.8
Also remember that:
"ip ospf network broadcast" gives subnet routes and DR/BDR
ala
r2#sh ip os ne
r2#sh ip os neighbor
Neighbor ID Pri State Dead Time Address Interface
192.168.1.1 1 FULL/DR 00:00:33 10.128.10.8 Serial0/0
r2#sh ip route
r2#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
10.0.0.0/24 is subnetted, 1 subnets
C 10.128.10.0 is directly connected, Serial0/0 <-- Note subnet
r2#
" ip ospf network point-to-multipoint " gives host routes ,neighbours and no
DR/BDR
ala
r2#sh ip os ne
r2#sh ip os neighbor
Neighbor ID Pri State Dead Time Address Interface
192.168.1.1 1 FULL/ - 00:01:42 10.128.10.8 Serial0/0
r2#sh ip route
r2#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
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.128.10.0/24 is directly connected, Serial0/0
O 10.128.10.3/32 [110/128] via 10.128.10.8, 00:01:09, Serial0/0
O 10.128.10.8/32 [110/64] via 10.128.10.8, 00:01:09, Serial0/0
^
Note host routes |
Hope this helps
Rich
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=36808&t=36781
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