From: nenad pudar (nenad.pudar@gmail.com)
Date: Sat Jul 16 2005 - 14:59:28 GMT-3
The network is hube-and-spoke
2spoke + hub
If I understand well you said if I force hub to be DR I do not need
static neighbor
Here is the config
Hub
interface Serial0/0
description to r7 2/1
no ip address
encapsulation frame-relay
no arp frame-relay
no frame-relay inverse-arp
!
interface Serial0/0.1 multipoint
ip address 172.16.32.2 255.255.255.192
no arp frame-relay
frame-relay map ip 172.16.32.4 204 broadcast
frame-relay map ip 172.16.32.5 205 broadcast
no frame-relay inverse-arp
interface Serial0/0.2 point-to-point
ip address 172.16.32.129 255.255.255.192
frame-relay interface-dlci 201
RTB-R2#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
1.1.1.1 1 FULL/ - 00:00:39 172.16.32.130 Serial0/0.2
5.5.5.5 0 FULL/DROTHER 00:01:51 172.16.32.5 Serial0/0.1
4.4.4.4 0 FULL/DROTHER 00:01:56 172.16.32.4 Serial0/0.1
spoke
interface Serial0/0
description to r7 2/2
ip address 172.16.32.4 255.255.255.192
encapsulation frame-relay
ip ospf priority 0
no arp frame-relay
frame-relay map ip 172.16.32.2 401 broadcast
frame-relay map ip 172.16.32.5 401 broadcast
no frame-relay inverse-arp
RTD-R4#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 1 FULL/DR 00:01:47 172.16.32.2 Serial0/0
Spoke
On 7/16/05, Jian Gu <guxiaojian@gmail.com> wrote:
> It might work if you have a simple two router network, but if you have
> a hub-spoke topology with more than one spoke, you will find that LSA
> database in those routers are not consistent.
>
> In NBMA mode a DR needs to be elected, but hub can not forward
> multicast packets from one spoke to another spoke, hence DR can not be
> elected automatically, the only option is to designate hub as DR by
> using neighbor command.
>
> On 7/16/05, nenad pudar <nenad.pudar@gmail.com> wrote:
> > Hi
> > This was most probably before ,sorry ,but I need to clear this.
> > In K. Solie's book and others it stays that the static ospf neighbor
> > are needed for neighbor connected using frame relay physical or
> > multipoint subinterfaces (Network Type NON_BROADCAST)
> >
> > However in my case it works fine without static neighbor .As a matter
> > of fact I wander why we need static neighbor if you have fr map
> > broadcast statement .
> >
> > How should I configure this on LAB exam ?
> > Am I missing something here ?
> >
> > thanks
> > nenad
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
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