From: Dmitry Volkov (dmitry.volkov@rogers.com)
Date: Sat Dec 27 2003 - 03:12:38 GMT-3
routers send their own priority to each other inside hello packets.
there is no way that one dictates to another what priority is should have.
one router can't alter priority of other router.
there is also no way that one can alter priority it received from other
let say A------B
B's interface has default priority "1"
You configure on A: neighbor x.x.x.x priority 10 (where x.x.x.x - ip of B's
interface)
when You do "sh run" immediatelly after You did put neigbor statement You
will see exactly what You did configure
and "sh ip ospf nei" shows configured priority but as soon A received hello
packet from B - everything is reverted back
Dmitry
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
> Behalf Of Mike Williams
> Sent: Saturday, December 27, 2003 12:53 AM
> To: 'Dmitry Volkov'; 'P729'; 'Bob Sinclair'; 'Ashok Verma (ashoverm)'
> Cc: ccielab@groupstudy.com
> Subject: RE: OSPF in NBMA networks
>
>
> Is it possible that by specifying a priority with the neigbor command
> that it's overriding the priority that's being sent? I know this
> doesn't seem to make sense as it would be silly to do so, but
> possible?
> Otherwise, I'd agree that there's really no reason to specify the
> priority on the neighbor command (not only no reason to
> specify, but no
> reason for Cisco to even have that command as a option unless there's
> *some* functionality, although it wouldn't be the first time =)
>
> Mike W.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> Dmitry Volkov
> Sent: Friday, December 26, 2003 10:24 PM
> To: 'P729'; 'Bob Sinclair'; 'Ashok Verma (ashoverm)'
> Cc: ccielab@groupstudy.com
> Subject: RE: OSPF in NBMA networks
>
>
> Ok. This is all true. But what is the purpose of such "indication" ??
> Surprisingly enough that Syed Faraz Shamim - author of
> "Troubleshooting
> IP routing protocols" also follows Doyle's "mistake" (page 557-558)
> http://www.cisco.com/en/US/tech/tk365/tk480/technologies_confi
> guration_e
> xamp
> le09186a0080094054.shtml#4
> router ospf 1
> network 1.1.1.0 0.0.0.255 area 0
> neighbor 1.1.1.2 priority 2
> !--Used to manually configure neighbors and assign
> the priority. In case of a Hub and Spoke topology,
> the Hub should be elected as the DR as it has
> connectivity to all the spokes. This can be done
> by assigning higher priority to the Hub using the
> neighbor command on the Spoke routers
>
> Dmitry
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
>
> > P729
> > Sent: Friday, December 26, 2003 2:24 PM
> > To: Bob Sinclair; Ashok Verma (ashoverm); ccielab@groupstudy.com
> > Subject: Re: OSPF in NBMA networks
> >
> >
> > Great explanation Bob. Another clue is there is no provision in the
> > OSPF Hello protocol for telling a neighbor what the neighbor's
> > priority should
> > be. You only indicate what your own priority is.
> >
> > Happy holidays,
> >
> > Mas Kato
> > https://ecardfile.com/id/mkato
> >
> > ----- Original Message -----
> > From: "Bob Sinclair" <bsin@cox.net>
> > To: "Ashok Verma (ashoverm)" <ashoverm@cisco.com>;
> > <ccielab@groupstudy.com>
> > Sent: Friday, December 26, 2003 8:03 AM
> > Subject: Re: OSPF in NBMA networks
> >
> >
> > > Ashok,
> > >
> > > What you are seeing is common and probably not a "bug".
> > >
> > > Much of the documentation seems to say that you can control
> > the priority
> > of
> > > a neighbor with this command. But the command docs
> > actually say that the
> > > neighbor priority command "indicates the router priority
> > value of the
> > > nonbroadcast neighbor associated with the IP address
> specified". In
>
> > > practice, it "indicates" the same way a speedometer
> "indicates" your
> > speed:
> > > it shows but does not determine.
> > >
> > > Even Doyle seems to say that you can control a neighbor's
> > priority with
> > this
> > > command, but I have never seen it actually work.
> > >
> > > In practice, you will find that only entering the priority
> > on the local
> > > interface will actually determine a priority. You will
> > also find that the
> > > local neighbor priority command reflects the priority
> > configured on the
> > > remote neighbor interface, and will change with it.
> > >
> > > HTH,
> > >
> > > -Bob Sinclair
> > > CCIE #10427, CISSP, MCSE
> > > www.netmasterclass.net
> > >
> > > ----- Original Message -----
> > > From: "Ashok Verma (ashoverm)" <ashoverm@cisco.com>
> > > To: <ccielab@groupstudy.com>
> > > Sent: Friday, December 26, 2003 5:20 AM
> > > Subject: OSPF in NBMA networks
> > >
> > >
> > > > Hi All
> > > >
> > > > I have a query about NEIGHBOR command, which is used in
> > the NBMA network
> > > > to make the ospf peering
> > > >
> > > > When we define the #neighbour x.x.x.x priority 0
> > > >
> > > > What is the priority 0 means . Is it mean the other side
> > router can not
> > > > become the DR .
> > > >
> > > > One more observation I have is even if configure the #
> > neighbour x.x.x.x
> > > > priority 0
> > > >
> > > > When I check the configuration I see it as #neighbour
> > x.x.x.x priority 1
> > > > .....is it a bug ?
> > > >
> > > >
> > > > Thanx
> > > >
> > > > Ashok Kumar Verma
> > > > CCIP,CCDP,CCNP
> > > > Network Consulting Engineer
> > > > Customer Advocacy Advanced Service Dep.
> > > > Service Provider AS Div.2
> > > > Cisco Systems, K.K.Japan.
> > > >
> > > > Tel: +81-3-5324-4583
> > > > e-mail: ashoverm@cisco.com
> > > >
> > > >
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