From: Peter (peter@cyscoexpert.com)
Date: Wed Sep 25 2002 - 11:51:36 GMT-3
The timers match but different network types behave differently when it
comes to DR/BDR election and this is the problem. For example if you match
timers with non-broadcast and point-to-multipoint types, NB expects the
election but PTM does not. Same thing with point-to-point and broadcast -
timers match but they don't agree on DR/BDR election.
__________________________
Peter
#7247 (R&S, Security)
CyscoExpert Corp.
4433 W. Touhy Ave. Suite 410
Lincolnwood, IL 60712
Phone (847) 674-3392
Fax (847) 674-2625
www.cyscoexpert.com
----- Original Message -----
From: "Larson, Chris" <CLarson@usaid.gov>
To: <C.Sammarcellino@sirtisistemi.it>; <ccielab@groupstudy.com>
Sent: Wednesday, September 25, 2002 8:21 AM
Subject: RE: Soile's Skynet Lab
> Yes, but there is another issue which there is some controversy over. I
> would suggest that even if all the timers match, if the network types do
not
> match, an adjecency will not form.
>
>
> My first question would be do most agree this is true?
>
> My second question is, why if timers match do mismatched network types
still
> keep an adjacency from forming??
>
>
>
>
>
> > -----Original Message-----
> > From: C.Sammarcellino@sirtisistemi.it
> > [SMTP:C.Sammarcellino@sirtisistemi.it]
> > Sent: Wednesday, September 25, 2002 3:29 AM
> > To: ccielab@groupstudy.com
> > Subject: RE: Soile's Skynet Lab
> >
> > The problem for OSPF for adjencies to form is thath,the following
> > parameter MUST match for all OSPF interface connect togheter,
> >
> > 1) AREA ID
> > 2) AUTHENTICATION
> > 3) Network Mask
> > 4) HELLO TIMER ------------------------------------------
> > 5) Router Dead Interval
> > 6) Stub Area Flag
> >
> >
> > for adjust the HELLO TIMER, you can use two solution:
> >
> > 1) You can use the "Ip ospf network type" under the interface and
> > automaticaly change the OSPF timer for the interface (for verify thath
> > "sh ip ospf interface")
> > 2) You can adjust the OSPF Hello timer (ip ospf hello-intervall,
ip
> > ospf dead-interval)
> >
> > Other problem for OSPF adjencies is the Broadcast capabilities of the
> > interface, than for interface with no Broadcast capibilities it is
> > necessary define the neighbor because the hello are unicast, (neighbor
> > x.x.x.x)
> >
> > Bye
> >
> > Ciro
> >
> >
> > You can set manualy the timer under the interface, if the time
> >
> >
> >
> >
> > "Larson, Chris" <CLarson@usaid.gov>@groupstudy.com on 24/09/2002
20.34.18
> >
> > Please respond to "Larson, Chris" <CLarson@usaid.gov>
> >
> > Sent by: nobody@groupstudy.com
> >
> >
> > To: "'Joe Martin'" <jmartin@capitalpremium.net>, Persio Pucci
> > <persiopucci@uol.com.br>, ccielab@groupstudy.com
> > cc:
> >
> > Subject: RE: Soile's Skynet Lab
> >
> >
> > I have not done Solies yet, but I know you do have to make all the
timers
> > match in OSPF for adjencies to form, however I do not think that simply
> > making timers match is a solution to differeing OSPF network types. Is
> > that
> > correct??
> >
> > > -----Original Message-----
> > > From: Joe Martin [SMTP:jmartin@capitalpremium.net]
> > > Sent: Tuesday, September 24, 2002 2:41 PM
> > > To: Persio Pucci; ccielab@groupstudy.com
> > > Subject: RE: Soile's Skynet Lab
> > >
> > > Persio,
> > >
> > > Read the thread on OSPF Dead Interval.
> > >
> > > If you change only the hello timer all the other timers are
> > automatically
> > > updated.
> > >
> > > Joe
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > > Persio Pucci
> > > Sent: Tuesday, September 24, 2002 12:01 PM
> > > To: ccielab@groupstudy.com
> > > Subject: Soile's Skynet Lab
> > >
> > >
> > > Folks,
> > >
> > > going through Soile's Skynet lab, I came upon one doubt: You are
> > supposed
> > > to
> > > chenge the OSPF Hello timer to 60s on R3. Also, you are supposed to
> > > overcome
> > > the different network problem between R1, R2 and R3 without using "ip
> > ospf
> > > network", and by this, you have to change also the timers. It's okay
> > then
> > > that
> > > the three routers agree upon 60s hello timers.
> > >
> > > My question is: shoudn't the dead timers be changed as well? I am
asking
> > > this
> > > because on the Skynet solution guide, there's no change on the dead
> > timer
> > > for
> > > any router.
> > >
> > > Regards,
> > >
> > > Persio
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