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Cisco 1720 routers and failover options

Posted on 2004-04-19
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Hi all,


Could anyone tell me if I can set up a fail over connection with Cisco 1720 routers?

Basically client has 2 sites, one of which is redundant site, with exact copy of their main network. They have multiple branches connecting to the Head Office. What they want is to config the routers to connect to the redundant site if the main site goes down.

Is this possible/viable and how would one go about it?

Thanks in advance

Cheers!

M.
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Question by:mmartinec
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9 Comments
 
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Expert Comment

by:Mike_helps_you
ID: 10866470
I assume Head Office is the main site. I would like to suggest a redundant link with a different provider between the sites, but I don't believe the 1750s can handle that.  Try the 2600, it works great for me.
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Author Comment

by:mmartinec
ID: 10866540
Thanks Mike.

Somehow I dont see them throwing out 20 1720's to be replaced with 2600's.

How about creating a VPN to the head Office, and have stand by VPN for the Redundant site.

So, when the main office VPN goes down and cant reconnect in, say 5 mins, the second VPN comes up to the other network?

Anything like that possible? LOL, maybe I should contact Cisco about this, hey?

Thanks again for the info.

M.

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Author Comment

by:mmartinec
ID: 10866618
Little bit further to this.

Would using RIP make this kind of configuration easier?
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Expert Comment

by:pseudocyber
ID: 10867749
More than likely, this would be a function of an application layer device.  What do you mean connect to the redundant site?  Connect to a web server?  Email?   File Services?

Assuming both sites are on the network - some kind of WAN.  You have Remote Office (RO) wants to access email.  It would be something like

Pseudo ( ;) ) code follows:

RO ---- connect to virtual email.
IF main office online THEN
     connect to main office physical server
ELSE
     connect to backup site physical server
ENDIF

In the above scenario - all the user knows is email is up.  It's up to the app to provide failover and redudancy - or at least this is how it should be designed - without any human intervention when a fail over to hot site occurs.
   
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LVL 79

Expert Comment

by:lrmoore
ID: 10868146
How are they connecting now? Frame relay?
Convert frame-relay to a MPLS IPFR or PIP (depending on provider, it is either IP over Frame Relay (AT&T) or Private IP (MCI))
These use BGP routing for dynamic failover.
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LVL 1

Expert Comment

by:swapsthegreat
ID: 10871019
You can configure any routing protocol such as EIGRP  or OSPF on your routers. The choice of routing protocol depends on the number of routers and the topology.

You have to configure the metric in such a way so that the main site will have lesser metric(preferred path) and the redundant site will have higher metric(not preferred). When the main site goes down, the routers will automatically route to the redundant site.

You can hardcode metrics for links in interface configuration mode.
for eg. for ospf
int ser 0/0
ip ospf cost x
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Author Comment

by:mmartinec
ID: 10873216
<<Quote>>
You have to configure the metric in such a way so that the main site will have lesser metric(preferred path) and the redundant site will have higher metric(not preferred). When the main site goes down, the routers will automatically route to the redundant site.

You can hardcode metrics for links in interface configuration mode.
for eg. for ospf
int ser 0/0
ip ospf cost x

<<end Quote>>

I was thinking about doing something like that, as this would make it totally transparent to the client. Can you point me to any literature that I could look up on how todo this?

Cheers!

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swapsthegreat earned 375 total points
ID: 10875532
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Author Comment

by:mmartinec
ID: 10875798
Thanks for that, will have a lookj and see if we can use this - Cheers!
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