From: alain faure (alainfaure@xxxxxxxx)
Date: Wed Mar 06 2002 - 08:45:47 GMT-3
Hi,
You don't have to configure ip ospf net on the interface.
The only thing you have to do is:
-----------------------
R1:
int s0
ip ospf priority 200 (for they get Designated Router)
router ospf 1
neighbor @ip of router2
neighbor @ip of router3
-------------------------
R2(same for R3):
int s0
ip ospf priority 0 (for they don't get Designated Router)
router ospf 1
neighbor @ip of router1(i don't think here is mandatory)
For the different type of network :
- type broadcast (like ether, token) as OSPF communicate with multicast
(224.0.0.5 and 224.0.0.6) there is no thinghs to do.
- type NBMA as ther is no broadcast possible(by the way no multicast) you must
do a neighbor to send information in a unicast way (a DR will be choose between
all the router on the same network, f(ip opsf priority))
- type point=to=point you have a direct connection between two router so no
need for a DR.
- type point-to-multi point : same as physical (NBMA)
But there is also differences due to the timers witch are not the same for the
differents type of network(due to a choose during OSPF design (?))
The frame map can play in topology if you forget somewhere BROADCAST key word
(except for the network type on witch OSPF don't use multicast).
Best regards
--- Wen Jia Yang <tonyblair@etang.com> a icrit : > hi,all .
>
> A senario like this, 1----------fr cloud--------2
> HUB \
> \
> \
> 3
>
> I use physical interfaces,1 is hub,2 and 3 are spokes
> I just turned off the inverse-arp on all of them,then issue two fr map
> statements only on 1(towards 2 and 3) & only one fr map statement on 2 and 3
> respectively(towards 1,of course),now I know that 1 can ping 2 and 3,and 2c3
> can ping 1 but 2 and 3 can't ping eath other.Then how will I configure ip
> ospf network statement if I will run ospf on it????
>
> Physical topology is NBMA,and the default ospf network is NBMA(if i am
> running FR)
> I just don't get the difference between the network type of ip ospf network
> statement and the physical topology.
>
> And does the fr map statement affect the physical topology????
>
> Thank you so much.
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