Hey Raul...
depending on how many sites you need to restore, and how much bandwidth you
need for restoral, Basic Rate ISDN is still a pretty good solution that I've
implemented before. The configuration is a little tricky and takes a keen
mind to implement successfully...but basically, the remote routers have a
floating static route to the BRI interface and it can dial the central site
backup router.
Another possible solution that I've used is to have a 2nd serial interface at
the remote site with a low speed connection to the Internet, and configure
encrypted tunnels from there to your central backup router or central site
Internet access router. Again, depending on the number of sites, that
solution might not be cost effective.
your design will have to take into account the following issues:
1. How many simultaneous circuit failures you want to cover
2. What will trigger bringing up the restoral circuit automatically (for
example, hard frame relay interface failure on the remote end, circuit
failure, loss of routes, etc.), or will it be done manually?
3. Which side of the circuit will initiate the restoral session (remote
inwards or central outwards?)
4. If automatic, whether you can disable the restoral during off-business
hours and weekends (especially for automatic ISDN restoral where long-distance
and per-minute usage charges apply)
5. How much bandwidth is necessary as a backup to keep the remote sides
productive.
6. Some sort of cost/benefit analysis based on the various possible
solutions.
7. Whether you need to limit the network access from the remote sites when
the frame relay circuit goes down (that is, maybe they're only permitted to
access corporate resources like email and intranet web servers, and deny
access to the Internet so that those pesky MP3 downloads don't hog all the
bandwidth)
8. Making sure you address all the security issues that arise from switched
or over-the-Internet restoral
"Raul De La Garza" <[EMAIL PROTECTED]> wrote:
> First, thanks for all of your comments. All were very helpful.
>
> Next, obviously I wasn't very clear in my previous message. I did not
> mention that both router redundancy and FR redundancy are important to the
> company I currently work for. And, we currently have one router already in
> place as our primary FR router. The 3640 I propose in my earlier message is
> an extra in the event the other 'box' dies. While it is more likely that an
> outage would result from the provider I would like to cover all bases
> possible on the 'inside of the smartjack'.
>
> Again, thanks for all of your suggestions. I particularly like the idea of
> a backup PVC. I may explore that option further.
>
> May God bless,
>
> Raul
>
> P.S. To Victor, I am from Texas, USA
>
>
> >From: "Raul De La Garza" <[EMAIL PROTECTED]>
> >Reply-To: "Raul De La Garza" <[EMAIL PROTECTED]>
> >To: [EMAIL PROTECTED]
> >Subject: How to Make Frame Relay Redundant?
> >Date: Mon, 19 Mar 2001 15:16:15 -0600
> >
> >Please forgive me if this topic has already been explored.
> >
> >I am considering the purchase of a 3640 in order to provide Internet
access
> >to our office at 100 Mbps. I will outfit it with 2 10/100 2-port modules.
> >
> >I am also considering making our Frame Relay network redundant by adding
> >two
> >1-port T1 w/CSU WICs, however, with only two FR lines coming in how would
I
> >make this a fault tolerant solution without having to obtain two more FR
> >circuits? HSRP is definitely being considered. Obviously, an Ethernet
hub
> >or switch is out of the question.
> >
> >Any help you could provide would be greatly appreciated.
> >
> >Raul De La Garza III
> >_
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