From: Barney Gaumer (bagaumer@yahoo.com)
Date: Thu Sep 25 2003 - 12:26:30 GMT-3
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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This archive was generated by hypermail 2.1.4 : Wed Oct 01 2003 - 07:24:37 GMT-3