From: Manish Gupta (manishgu@cisco.com)
Date: Wed Nov 13 2002 - 04:54:52 GMT-3
Hi Tao
I think your topology is like:
<B>
| |
| |
| |
<C> <A>
In this case, If B is DR, everything should work fine. But if you want to
make either A or C DR, In that case they will only form neighbor ship with
B only cause media is NBMA. In NBMA mode only directly connected neighbor
can form neighborship.
-Manish
On Wed, 13 Nov 2002, jl yan wrote:
> I think the ttl vaule equals to 1. so it can ping each other but cannot
> establish neighbor
>
>
>
>
>
>
> >From: "Tao Wang" <wangtao_sh@hotmail.com>
> >Reply-To: "Tao Wang" <wangtao_sh@hotmail.com>
> >To: spage@nc.rr.com, ccielab@groupstudy.com
> >Subject: RE: OSPF on NBMA
> >Date: Wed, 13 Nov 2002 13:11:47 +0800
> >
> >I see this config should work.
> >But my question is that in NBMA if I could ping successully whether I could
> >build neigbor with the command "neighbor" even these two nodes haven't
> >directly PVC.
> >
> >
> >>From: "Jake Jake" <spage@nc.rr.com>
> >>To: "Tao Wang" <wangtao_sh@hotmail.com>, <ccielab@groupstudy.com>
> >>Subject: RE: OSPF on NBMA
> >>Date: Wed, 13 Nov 2002 00:10:17 -0500
> >>
> >>Configure B as the DR. Use neighbor statements on B pointing to A and to
> >C.
> >>Make sure A and C had low ospf priority so they dont become DR upon
> >reboot.
> >>
> >>
> >>-----Original Message-----
> >>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Tao
> >>Wang
> >>Sent: Tuesday, November 12, 2002 11:01 PM
> >>To: ccielab@groupstudy.com
> >>Subject: Q: OSPF on NBMA
> >>
> >>
> >>Dear all,
> >>
> >>I have question on OSPF on FR NBMA.
> >>
> >>There are 3 nodes--- A B and C. They build a Hub-Spoke structure. B is
> >HUB.
> >>
> >>Now I config to make C as DR and using the command "neighbor" to let B and
> >>A as the neighbors of C.
> >>On A B and C, I have made static maps to make them be able to ping each
> >>others successfully.
> >>
> >>But the result is C and A couldn't build neighbor with each other.
> >>I don't understand the command "neighbor" very much.C should use the
> >>unicast to send the hello
> >>packet to A. If C should ping A successfully, then the hello packet from C
> >>should be able to get A.
> >>
> >>From the result, I think if two nodes want to build neighbors with each
> >>other in NBMA, they should
> >>have dirctly PVC between them.But I don't know why exactly.
> >>
> >>Does someone please help?
> >>
> >>Thanks & Regards
> >>
> >>Tao
> >>
> >>
> >>
> >>
> >>
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This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:22:58 GMT-3