From: Andres Zeller (azeller@xxxxxxxxxx)
Date: Tue Oct 17 2000 - 18:22:25 GMT-3
I thought the static mapping was only necessary if you do not support
inverse-arp.
Andres
Tony Olzak wrote:
>
> Except that on a true multi-point frame, you don't need map statements if
> you use "point-to-multipoint". If you use broadcast you'll need to alter
> priorities and place map statements on the spokes.
>
> Tony
>
> ----- Original Message -----
> From: "Andres Zeller" <azeller@uswest.net>
> To: "Sam Munzani" <sam@munzani.com>
> Cc: "mannan venkatesan" <venkat_m@ins.com>; <ccielab@groupstudy.com>
> Sent: Tuesday, October 17, 2000 12:17 PM
> Subject: Re: OSPF Problem
>
> > The OSPF network type is only significant, in that it must be the same
> > for all routers participating on a particular link, Whether it is a p2p
> > or p2multip.
> >
> > Andres
> >
> > Sam Munzani wrote:
> > >
> > > Comments inline.
> > >
> > > > Hi,
> > > > I was playing in ospf over FR lab and came across an interesting
> problem(I
> > > > was trying to simulate the problem we had in our client production
> > > network).
> > > > I configured R1 as hub (sub-ifs) and R2 and R3 as spoke (physical
> > > > interface). Here the config,
> > > >
> > > > R1 :
> > > > interface Serial0.1 point-to-point
> > > > ip address 10.1.0.1 255.255.0.0
> > > > ip ospf network broadcast
> > > > frame-relay interface-dlci 100
> > >
> > > Why are you using "ip ospf network broadcast" on a point-to-point link?
> > > Specially in NBMA it's not a good idea. Leave it to default
> Point-to-Point.
> > > and it will form adjecency with remote end.
> > >
> > > > !
> > > > interface Serial0.2 point-to-point
> > > > ip address 10.2.0.1 255.255.0.0
> > > > ip ospf network Point-to-multipoint
> > > > frame-relay interface-dlci 103
> > >
> > > Again,
> > > If your interface is Point-to-Point why are you using
> Point-to-Multipoint in
> > > here? Use point-to-point at both ends.
> > >
> > > > router ospf 10
> > > > network 10.0.0.0 0.255.255.255 area 0
> > > >
> > > > R2 :
> > > > interface Serial0
> > > > ip address 10.1.0.2 255.255.0.0
> > > > encapsulation frame-relay
> > > > ip ospf network Point-to-multipoint
> > > > frame-relay map ip 10.1.0.1 106
> > > >
> > > > router ospf 10
> > > > network 10.0.0.0 0.255.255.255 area 0
> > > >
> > > > R3:
> > > > interface Serial0
> > > > ip address 10.2.0.2 255.255.0.0
> > > > encapsulation frame-relay
> > > > ip ospf network Point-to-multipoint
> > > > frame-relay map ip 10.2.0.1 106
> > > >
> > > > router ospf 10
> > > > network 10.0.0.0 0.255.255.255 area 0
> > > >
> > > > It worked fine with this config. Then I changed OSPF network type to
> > > > "Broadcast" in s0 of R3 and s0.2 of R1. R3 became DR and R1 became
> BDR.
> > > > After I changed OSPF network type to "Broadcast" in s0.1 of R1 and s0
> of
> > > R2.
> > > > As soon as I entered network type 'broadcast' in R2, the network
> broke. I
> > > > couldn't access any of the routers for 5 minutes.
> > > >
> > > > Now 'sh ip ospf nei' command shows,
> > > >
> > > > R1:
> > > > Neighbor ID Pri State Dead Time Address
> > > Interface
> > > > 10.1.0.2 1 FULL/BDR 00:00:39 10.1.0.2
> > > Serial0.1
> > > > 10.2.0.2 1 FULL/BDR 00:00:37 10.2.0.2
> > > Serial0.2
> > > >
> > > > R2:
> > > > Neighbor ID Pri State Dead Time Address
> > > Interface
> > > > 10.2.0.1 1 FULL/DR 00:00:31 10.1.0.1
> Serial0
> > > >
> > > > R3:
> > > > Neighbor ID Pri State Dead Time Address
> > > Interface
> > > > 10.2.0.1 1 FULL/DR 00:00:39 10.2.0.1
> Serial0
> > > >
> > > > I know DR and BDR election was going on, but why the network broke?
> During
> > > > election, routers multicast packets and we have only 3 routers. So,
> what
> > > > traffic did the routers send here? Can I have multiple OSPF network in
> one
> > > > broadcast medium? Can someone clarify my questions? Think I am missing
> > > > something here.
> > > >
> > > > Thanks,
> > > >
> > > >
> > > >
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