From: Thompson, Kenny (K.) (kthomp40@xxxxxxxx)
Date: Mon Nov 26 2001 - 13:08:32 GMT-3
The whole idea of an ISDN backup link is to keep business going at the lowest p
ossible cost while the primary link is being brought back to operation. One of
the biggest contributors to ISDN bills is routing updates, keepalives etc which
are kept off the link as by design using access-lists. If don't mind the bill
then don't put an access-list against it.
Yes you are technically right, but I believe in practising for the exam, we nee
d to practice logic and strategic thinking rather than all techi stuff.
I have not read through and through what you are doing here but I just thought
an input could help. That is what this site is about.
Apologies in advance if this does not apply to your question.
Thanks
Kenny
-----Original Message-----
From: kenairs [mailto:kenairs@hotmail.com]
Sent: Monday, November 26, 2001 3:29 PM
To: Rivron Francois; Jobson, Eddie; ccielab@groupstudy.com
Subject: Re: Dialer watch question
Hi Francois,
Refering to the cisco link, i have some question.
The dialer-list states that "access-list 101 deny ospf any any ".
I know that this prevents ospf hellos from bringing up the isdn link.
But with this access-list, how can the ospf routes propagates to the other
router once the backup (isdn) link is used ?
Am i missing some thing ?
tks
----- Original Message -----
From: Rivron Francois <Francois.Rivron@ei-rsi.fr>
To: Jobson, Eddie <EJobson@thrupoint.net>; <ccielab@groupstudy.com>
Sent: Monday, November 26, 2001 8:42 PM
Subject: RE: Dialer watch question
> Eddie,
>
> Look at
> http://www.cisco.com/warp/public/129/bri-backup-map-watch.html
>
> There is a good explanation of dialer watch.
>
> About the loopback problem :
>
> r1---serial---r2
> | |
> +----BRI-----+
>
> r1
> interface lo0
> ip adresse 10.10.10.1 255.255.255.0
>
> r2
> int bri0
> dialer watch-group 1
>
> dialer watch-list 1 ip 10.10.10.1 255.255.255.255
>
> because
>
> r2#show ip route
> 10.0.0.0/32 is subnetted, 1 subnets
> O 10.10.10.1 [110/65] via ..... Serial0
>
>
> Whatever the subnet of network is on the int loopback, you have to set /32
> in the dialer watch if you monitor this network.
>
>
> Francois.
>
>
>
> > -----Message d'origine-----
> > De: Jobson, Eddie [SMTP:EJobson@thrupoint.net]
> > Date: lundi 26 novembre 2001 11:53
> > @: 'Rivron Francois '; Jobson, Eddie; ''ccielab@groupstudy.com' '
> > Objet: RE: Dialer watch question
> >
> > Thanks Francois.
> >
> > If the ip ospf network point-to-point was used the /32 loopback is then
> > advertised as a /24 or whatever, but would you still use the specific
> > interface address? The one used in the dialer map is usually the remote
> > ISDN
> > and wouldn't be used as a dialer watch, it would usually be a local
> > LAN/WAN
> > that the ISDN was monitoring and backing up.
> >
> > Eddie.
> >
> >
> > -----Original Message-----
> > From: Rivron Francois
> > To: Jobson, Eddie; 'ccielab@groupstudy.com'
> > Sent: 26/11/01 05:24
> > Subject: RE: Dialer watch question
> >
> > Hello,
> >
> > The <network> statement in "dialer map " and "dialer watch-list" command
> >
> > have to be the same.
> >
> > The <network > entry is the one looked up in the routing
> > table...so
> > if you monitor network 10.10.10.0 you have to use "dialer watch-list 1
> > ip
> > 10.10.10.1 255.255.255.0"
> >
> > Aware with the int loopback and OSPF,cause OSPF use a /32 mask
> > to
> > describe a stub network , so the specific address of the int loopback
> > need
> > to be used in "dialer watch-list".
> >
> > Francois.
> >
> >
> > > -----Message d'origine-----
> > > De: Jobson, Eddie [SMTP:EJobson@thrupoint.net]
> > > Date: lundi 26 novembre 2001 11:03
> > > @: 'ccielab@groupstudy.com'
> > > Objet: Dialer watch question
> > >
> > > If dialer watch is used to monitor an interface does the specific
> > > interface
> > > IP address have to be used including the subnet mask for the network
> > it
> > > sits
> > > on, or is it better to use the whole network range, or can either be
> > used.
> > >
> > > dialer watch-list 1 ip 10.10.10.0 255.255.255.0
> > > OR
> > > dialer watch-list 1 ip 10.10.10.1 255.255.255.0
> > >
> > > Thanks,
> > >
> > > Eddie.Note: The information contained in this message may be
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> > is
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> > error,
> > > please notify us immediately by replying to the message and deleting
> > it
> > > from
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> > Note: The information contained in this message may be privileged and
> > confidential and protected from disclosure. If the reader of this
message
> > is not the intended recipient, or an employee or agent responsible for
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