From: Chuck Church (ccie8776@rochester.rr.com)
Date: Sat Feb 08 2003 - 17:21:01 GMT-3
I believe the two devices need to be on the same IP subnet with matching
masks for adjacency to occur as well.
Chuck Church
CCIE #8776, MCNE, MCSE
----- Original Message -----
From: "Brian McGahan" <brian@cyscoexpert.com>
To: "'kym blair'" <kymblair@hotmail.com>; <ccielab@groupstudy.com>;
<sagevadi@yahoo.co.uk>
Sent: Saturday, February 08, 2003 2:21 PM
Subject: RE: OSPF: point-to-point issue (NOT hello mismatch)
> Guys,
>
> OSPF network type must match for routers to be adjacent.
> Matching of the timers and DR/BDR election is not sufficient. Interface
> type is not directly related to the establishment of adjacency; however,
> certain interface types default to certain OSPF network types.
>
> For example, multipoint non-broadcast interfaces such as
> Frame-Relay and ATM main and multipoint subinterfaces default to OSPF
> network non-broadcast. Point-to-point interfaces such as HDLC, and p2p
> Frame-Relay and ATM interfaces default to network-type point-to-point.
> Broadcast interfaces such as Ethernet and Token-Ring default to network
> type Broadcast.
>
> Here are some of the parameters that must match in order for
> routers to be adjacent:
>
> 1. Network type
> 2. Hello/Dead interval
> 3. MTU (or MTU ignore)
> 4. Authentication
> 5. Area
> 6. Stub flags
> 7. Unique Router-ID's
>
>
> For more information on troubleshooting OSPF adjacency:
>
> http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a
> 0080094050.shtml
>
> http://www.cisco.com/en/US/tech/tk648/tk365/technologies_tech_note09186a
> 0080093f0f.shtml
>
>
>
> HTH
>
> Brian McGahan, CCIE #8593
> Director of Design and Implementation
> brian@cyscoexpert.com
>
> CyscoExpert Corporation
> Internetwork Consulting & Training
> Voice: 847.674.3392
> Fax: 847.674.2625
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> > kym blair
> > Sent: Saturday, February 08, 2003 6:18 AM
> > To: ccielab@groupstudy.com; sagevadi@yahoo.co.uk
> > Subject: Re: OSPF: point-to-point issue (NOT hello mismatch)
> >
> > Sage,
> >
> > There are two considerations when mixing ospf network types:
> >
> > (1) hello/dead intervals -- sounds like you already know how to adjust
> > those
> > to match
> >
> > (2) Use or non-use of DR/BDR
> >
> >
> > Non-broadcast and broadcast elect DR/BDR, but have different
> hello/dead
> > intervals.
> >
> > Point-to-point and multipoint do not elect DR/BDR, and also have
> different
> > hello/dead intervals. Multipoint may require neighbor statements over
> > NBMA
> > so it knows which router to form an adjacency with.
> >
> > Here is a good link to start with:
> >
> >
> http://www.cisco.com/en/US/tech/tk648/tk365/technologies_configuration_e
> xa
> > mple09186a0080094054.shtml
> >
> > HTH, Kym
> >
> >
> >
> >
> >
> >
> >
> > >From: "Georg Pauwen" <pauwen@hotmail.com>
> > >Reply-To: "Georg Pauwen" <pauwen@hotmail.com>
> > >To: sagevadi@yahoo.co.uk, ccielab@groupstudy.com
> > >Subject: Re: OSPF: point-to-point issue (NOT hello mismatch)
> > >Date: Sat, 08 Feb 2003 09:02:48 +0000
> > >
> > >Hello Sage,
> > >
> > >can you send the configs of both routers ?
> > >
> > >Regards,
> > >
> > >Georg
> > >
> > >
> > >
> > >
> > >>From: Sage Vadi <sagevadi@yahoo.co.uk>
> > >>Reply-To: Sage Vadi <sagevadi@yahoo.co.uk>
> > >>To: ccielab@groupstudy.com
> > >>Subject: OSPF: point-to-point issue (NOT hello mismatch)
> > >>Date: Sat, 8 Feb 2003 07:41:27 +0000 (GMT)
> > >>
> > >>All,
> > >>
> > >>In my labs I was testing (OSPF):
> > >>
> > >>R1--point-to-point-------physicalSerial--R2
> > >>
> > >>NB: I cannot use ospf network types which is fine, so
> > >>I just did map ip with dlci and neighbor statements.
> > >>Adj comes up after hello adjustment.
> > >>
> > >>Problem is I can't see any OSPF routes on R2. This can
> > >>work if I change R2 to point-to-point or R1 to
> > >>multipoint.
> > >>
> > >>I can't find any obvious doco which states we
> > >>would/could have hassles with this?
> > >>
> > >>rgds,
> > >>Sage
> > >>
> > >>
> > >>__________________________________________________
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