1. If your remote sites have BRI cards then unless you care going to
have someone with analog modems dial-in to the PRI I don't see a need for
the digital modems.
2. You can implement the dial portion of DBU (dial back-up) using
either backup interfaces or floating static routes. Backup interfaces will
watch DCD of the serial interface that you want to backup, and floating
static routes rely on routing protocol updates. If have many networks that
are frame-relay and I use floating static routes since backup interfaces
will not always work. IE: if only the PVC gets dropped and not the line,
then backup interfaces will not kick in.
3. If you using floating static routes, then make sure that you deny
OSPF in your interesting traffic list, or routing updates will keep the line
up and running.
There are many great examples of both type of backup scenarios on the Cisco
web site. They will also show you how to setup the PRI at the HQ side.
Jason Coleman - CCNP, CCDP
-----Original Message-----
From: Paulo Roque [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 25, 2001 7:56 AM
To: [EMAIL PROTECTED]
Subject: Dial backup with OSPF [7:1851]
Hi guys,
We are planning a ISDN dial backup for a ospf network with
about 30 small
stub areas.
In the central site we will have a router with PRI line and
30 digital
modems and in the remote sites we will have a backup router
with ISDN BRI
interfaces, which will dial when the main link become
unavailable.
- Have anyone implement a solution like this?
- Has this solution any know problem?
- Will backup router dial only when the main link fail or it
will dial
periodically for routing update?
--
Paulo Roque
Network Engineer
[EMAIL PROTECTED]
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