From: Wen Jia Yang (tonyblair@xxxxxxxxx)
Date: Wed Mar 06 2002 - 12:35:39 GMT-3
Thank you so much,I understood the concepts finally.
----- Original Message -----
From: "alain faure" <alainfaure@yahoo.fr>
To: "Wen Jia Yang" <tonyblair@etang.com>; <ccielab@groupstudy.com>
Sent: Wednesday, March 06, 2002 7:45 PM
Subject: Re: I don't understand ospf network statement with physical network to
pology
> 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 mus
t
> do a neighbor to send information in a unicast way (a DR will be choose betwe
en
> 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 th
e
> 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 2c
3
> > 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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