From: Paul Price (paprice@xxxxxxxxx)
Date: Mon Apr 16 2001 - 22:04:19 GMT-3
Here is a good quick explanation of inteface command " ip ospf
demand-circuit" Look at the implemetation considerations and the example
included. Should do what you want.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c/1c
prt1/1cospf.htm#xtocid709123
Hope this helps
Paul
At 05:20 PM 4/16/2001 -0700, Chuck Larrieu wrote:
>Isn't this where the IP OSPF demand circuit command comes into play?
>
>Chuck
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Rick
>Burts
>Sent: Monday, April 16, 2001 5:05 PM
>To: Jay Hennigan
>Cc: Chris Mott; CCIE
>Subject: RE: External LSAs keeping ISDN line up!!!
>
>Jay
>
>There is one aspect of your reasoning that I do not understand.
>Assuming your scenario: the dialer list will deny ospf as interesting
>traffic, and a ping brings up the line so adjacencies are formed and
>ospf routes are added to the table. What happens when the line has gone
>inactive and some link change generates an LSA which we need to
>transmit to the neighbor on the demand circuit but ospf cannot bring
>up the link because it is not interesting ? I think this may appear
>to work in a limited lab scenario but ultimately I think this is a
>broken implementation. I agree with Chris that the better
>implementation has ospf as interesting traffic in the dialer list.
>
>Rick
>
>Rick Burts, CCSI CCIE 4615 burts@mentortech.com
>Mentor Technologies 240-568-6500 ext 6652
>133 National Business Parkway 240-568-6515 fax
>Annapolis Junction, Md 20701
>
>Chesapeake Network Solutions has now become Mentor Technologies.
>Mentor Technologies is a certified Cisco Training Partner and also
>a Cisco Professional Services partner.
>We offer most of the Cisco training courses.
>We also offer training in Checkpoint Firewall software and
>Fore Systems (now Marconi) and MicroMuse.
>We also provide network consulting services including
>design, management, and problem solving.
>We have 20 CCIEs on our staff.
>We offer the breakthrough VLAB remote access technology for
>access to practice configuration on real equipment.
>
>On Sun, 15 Apr 2001, Jay Hennigan wrote:
>
> > On Sun, 15 Apr 2001, Chris Mott wrote:
> >
> > > I've never understood the reasoning behind a dialer-list that has "deny
>ospf
> > > any any", as I thought the whole reason for an OSPF demand-circuit was
>that
> > > OSPF could bring up the link if a routing decision deemed it necessary
>...
> > > please correct me if I'm wrong ...
> >
> > The dialer-list keeps the OSPF multicast traffic from bringing up the
>link,
> > but doesn't deny it from traversing the link. Once the link has been
> > established once (like by a ping), then the OSPF routes will be learned
> > and retained.
> >
> > Normal IP traffic destined for that link (if not denied by an access
> > list) will then bring up the dialer.
> >
> > --
> > Jay Hennigan - Network Administration - jay@west.net
> > NetLojix Communications, Inc. NASDAQ: NETX - http://www.netlojix.com/
> > WestNet: Connecting you to the planet. 805 884-6323
> > **Please read:http://www.groupstudy.com/list/posting.html
>**Please read:http://www.groupstudy.com/list/posting.html
>**Please read:http://www.groupstudy.com/list/posting.html
Paul George Price - paprice@cisco.com
Brasil NSP
Systems Engineer
www.cisco.com/br
Virtually all Internet traffic travels across the systems of one company:
Cisco Systems
Build It, And Voice Will Come
Empowering the Internet Generation
Cisco Systems
Av. Nagues Unidas, 12.901 25.a Torre Oeste - Sco Paulo - Brasil
phone :55-11-5508-9995
mobile:55-11-9117-2333
Pager Int.+55 11 534-0737 cod.4306171
Pager Brasil: 0800 999888
Pager Brasil: http://www.teletrim.com.br
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:29:47 GMT-3