From: Barney Gaumer (bagaumer@yahoo.com)
Date: Thu Sep 25 2003 - 12:48:38 GMT-3
I will try that - Thank you!
--- Scott Morris <swm@emanon.com> wrote:
> Let's back up a little bit... Dialer circuits are
> interesting creatures
> unto themselves.
>
> CDP will allow the generation of a neighbor route
> (/32 host route). When
> it comes up, it's in your OSPF table. When CDP
> neighbor goes away (no
> relation to OSPF), then the host route goes away.
> If the host route
> goes away, your database changes and OSPF will dial
> up the other side to
> talk about it. Then the route comes back...
>
> It's a big evil circle.
>
> You can disable CDP. That's one way to solve the
> problem. The other
> way is:
>
> No peer neighbor-route
>
> That will prevent the generation of the /32 route
> for the CDP neighbor
> on a dial circuit. So from that aspect, I can see
> where people get the
> idea that CDP brings the link up. It doesn't
> really, but because of
> something 'assisted by' CDP that it does.
>
> Give that a whirl and see whether your
> up/down/up/down problem goes
> away!
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service
> Provider) #4713,
> CISSP, JNCIS, et al.
> IPExpert CCIE Program Manager
> IPExpert Sr. Technical Instructor
> swm@emanon.com/smorris@ipexpert.net
> http://www.ipexpert.net
>
>
>
> -----Original Message-----
> From: Barney Gaumer [mailto:bagaumer@yahoo.com]
> Sent: Thursday, September 25, 2003 11:27 AM
> To: Scott Morris; 'Nawaz, Ajaz'; 'Donny MATEO';
> 'Peng Zheng'
> Cc: ccielab@groupstudy.com; nobody@groupstudy.com
> Subject: RE: Should I disable cdp on ISDN
>
>
> I was playing with OSPF demand circuit the other day
> &
> the only way I could get everything to work was to
> enable broadcast on the "dialer map ip" and use
> "ospf database-filter"
> otherwise the link kept flapping up and down.
>
> The adjacency occured like it should for a demand
> circuit and all of the routes were there, just
> didn't
> think I had to do anything more than make one side
> of
> the ISDN circuit a demand circuit.
>
> What did I do wrong??
>
> interface BRI0/0
> bandwidth 128
> ip address 10.1.1.1 255.255.255.0
> encapsulation ppp
> ip ospf demand-circuit
> ip ospf database-filter all out
> dialer map ip 10.1.1.2 name rtr-g broadcast
> 4082222222
> dialer load-threshold 1 outbound
> dialer-group 1
> isdn switch-type basic-ni
> isdn spid1 40811111111
> isdn spid2 40811111112
> no cdp enable
> ppp authentication chap
> ppp chap hostname rtr-a
> ppp chap password 0 cisco
> ppp multilink
>
> --- Scott Morris <swm@emanon.com> wrote:
> > OSPF Demand Circuit has nothing to do with whether
> > CDP will bring your
> > circuit up or not! Your definition of interesting
> > traffic defines that.
> > OSPF demand circuit doesn't define interesting
> > traffic. It makes sure
> > that even though OSPF >IS< interesting traffic, it
> > won't be constantly
> > talking to the other side unless something change.
> >
> > OSPF Demand Circuit suppresses the hello packets
> > (which would be
> > interesting) and puts routes in the database into
> a
> > do not age state in
> > order to keep them happy. And keeps the neighbor
> > connection formed
> > (part of suppressing hellos).
> >
> > CDP is still a completely different beast.
> >
> >
> > Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service
> > Provider) #4713,
> > CISSP, JNCIS, et al.
> > IPExpert CCIE Program Manager
> > IPExpert Sr. Technical Instructor
> swm@emanon.com/smorris@ipexpert.net
> > http://www.ipexpert.net
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com
> > [mailto:nobody@groupstudy.com] On Behalf Of
> > Nawaz, Ajaz
> > Sent: Thursday, September 25, 2003 8:58 AM
> > To: 'Donny MATEO'; Peng Zheng
> > Cc: ccielab@groupstudy.com; nobody@groupstudy.com
> > Subject: RE: Should I disable cdp on ISDN
> >
> >
> > as a reader this is the most complete reply.
> > as I understand it, OPSF demand circuit is the
> only
> > time where you would
> > explicity disable cdp (interface only) in order to
> > prevent an isdn
> > circuit from coming UP unecessarily.
> >
> > ajaz
> >
> > -----Original Message-----
> > From: Donny MATEO
> > [mailto:donny.mateo@sg.ca-indosuez.com]
> > Sent: 25 September 2003 08:57
> > To: Peng Zheng
> > Cc: ccielab@groupstudy.com; nobody@groupstudy.com
> > Subject: Re: Should I disable cdp on ISDN
> >
> >
> > What techology are you refering to ? It really is
> > technology specific
> >
> > backup interface => no need
> > static route => make sure you didn't define CDP as
> interesting traffic
> > in
> > the dialer-list (there is no need to turn it off)
> > ospf demand-circuit => filter it out or turn it
> off
> > dialer-watch=> no
> > need i believe..not sure though..
> >
> > so which one is it are you refering to ?
> >
> > Donny
> >
> >
> >
> >
> >
> >
> > Peng Zheng <zpnist@yahoo.com>
> > Sent by: nobody@groupstudy.com
> > 09/25/2003 03:24 PM
> > Please respond to Peng Zheng
> >
> >
> > To: ccielab@groupstudy.com
> > cc: (bcc: Donny
> > MATEO/ADPC/ASIA/BANQUE_INDOSUEZ/FR)
> > Subject: Should I disable cdp on
> ISDN
> >
> >
> > On page 144 CCIE Practical Studies: Security, it
> > said
> > cdp triggers the ISDN call and therefore should be
> > disabled if it isn't needed.
> >
> > Is that true? SHould I always disable cdp when
> > configure DDR on ISDN?
> >
> >
> >
> > __________________________________
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>
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