From: Sumit.kumar@comcast.net
Date: Tue Dec 30 2003 - 02:14:49 GMT-3
Alec,
Dialer-watch is optimal in Hub and Spoke topology where Spoke router watches
the remote Hub site route and triggers a call in case that route disappears
from routing table (for any reason). Dialer-watch works optimally with
routing protocols like OSPF and BGP and one-way configuration is enough
unless you want to have additional redundancy(Imagine a central site with
100+ branch sites). To make it work both way you will have to configure DW
to watch route(s) at each site of the opposite sides.
Danny,
I agree with you that dialer watch doesn't need interesting traffic to
bring up the isdn or down but the Routing protocols multicast updates do
trigger ISDN calls so it is a good practice to deny the routing protocols as
interesting traffic.
good luck
Sumit
----- Original Message -----
From: "Pun, Alec CL" <Alec.CL.Pun@pccw.com>
To: <Danny.Andaluz@triaton-na.com>; <ccielab@groupstudy.com>
Sent: Monday, December 29, 2003 9:52 PM
Subject: RE: dialer-watch question
> I agree with you that dialer-group should take away or deny OSPF since it
> will always bring up the line.
>
> But if we configure dialer watch on both ends, once the watched route
> disappear, both side will make call at the same time !! Isn't that is not
> suggested by Cisco ?
>
> rgds,
> alec
>
> -----Original Message-----
> From: Danny.Andaluz@triaton-na.com [mailto:Danny.Andaluz@triaton-na.com]
> Sent: Tuesday, December 30, 2003 3:43 AM
> To: Pun, Alec CL; ccielab@groupstudy.com
> Subject: RE: dialer-watch question
>
>
>
> I didn't see the part about both routers dialing. Configure dialer watch
on
> both then.
>
> IP won't trigger the call if you're running Dialer-watch, so again, it
> shouldn't matter. EIGRP and OSPF use MC addresses to communicate back and
> forth (224.0.0.10 and 224.0.0.5 respectively). This is included in IP.
>
> I would include a "dialer-group <list number>" with a "dialer-list <list
> number> protocol ip permit". I was just pointing out how it does not use
> this dialer-list traffic to initiate a call.
>
> Danny
>
> -----Original Message-----
> From: Pun, Alec CL [ mailto:Alec.CL.Pun@pccw.com
> <mailto:Alec.CL.Pun@pccw.com> ]
> Sent: Monday, December 29, 2003 1:22 PM
> To: Andaluz, Danilo, Triaton/NA; ccielab@groupstudy.com
> Subject: RE: dialer-watch question
>
>
> Danny,
>
> Some questions
> 1) What if both routers can initiate ISDN calls ?
> 2) Understand that dialer-watch itself is an interesting traffic. But if
we
> don't deny OSPF hello, won't it always kick up the line ? I just want to
> know if it is a MUST to either remove the dialer-group or deny OSPF/EIGRP
> hello when using dialer-watch together.
>
>
> rgds,
> alec
>
> -----Original Message-----
> From: Danny.Andaluz@triaton-na.com [ mailto:Danny.Andaluz@triaton-na.com
> <mailto:Danny.Andaluz@triaton-na.com> ]
> Sent: Tuesday, December 30, 2003 2:15 AM
> To: Pun, Alec CL; ccielab@groupstudy.com
> Subject: RE: dialer-watch question
>
>
>
> I would say configure Dialer-Watch only on the calling router. Only the
> calling router needs to have this configured.
>
> As far as the OSPF hello's, it shouldn't matter. Dialer-Watch is watching
> for the loss of a route. That is the "interesting" traffic, not IP
traffic.
> I have tested dialer-watch with no dialer-group configured on the BRI or
> Dialer interface. It works fine. Try it.
>
> HTH,
> Danny
>
> -----Original Message-----
> From: Pun, Alec CL [ mailto:Alec.CL.Pun@pccw.com
> <mailto:Alec.CL.Pun@pccw.com> < mailto:Alec.CL.Pun@pccw.com
> <mailto:Alec.CL.Pun@pccw.com> > ]
> Sent: Monday, December 29, 2003 11:41 AM
> To: ccielab@groupstudy.com
> Subject: dialer-watch question
>
>
> Hi group,
>
> R1 ---- ISDN ------ R2
> | |
> |----------FR-----------|
>
> Both R1 and R2 can make ISDN calls and the topology is running OSPF. My
> question is if dialer-watch is used to watch the remote loopback, is it
> necessary
>
> 1) to configure dialer-watch on both routers ?
> 2) deny ospf hello in the dialer-list for BOTH routers ?
>
> rgds,
> alec
>
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