Setup Hardware Redundancy with two physical router & two T1's...

Posted on 2008-06-09
Last Modified: 2011-10-19
Okay so we're looking at possibly making our network uber-redundant.  I've been asked to piece together possibilities/costs associated with having dual routers, dual firewalls, switches, etc, etc.  Some of this stuff we already have to a certain extent.  i'm just a bit hung up on the router redundancy so any help would be appreciated.

Current Environment (starting from outside; coming in)
- Two T1 lines (we have ASN # & use BGP with AT&T & Savvis as ISPs)
- Cisco 2691 router
- Cisco PIX 515e firewall (restricted)
- Cisco Catalyst 4507r switch (dual supervisor engines w/hot failover & dual power supplies)
- Internal Network

Proposed Environtment
- Two T1 lines (as above)
- Dual Cisco 1800 series routers with HSRP? *This is where I'm stuck.  I'm not sure exactly what model router we're getting b/c we're letting A&T manage the router & the order hasn't been fully placed.   So I don't even know if this is feasible.
- Dual Cisco ASA 5510 security appliances
- Cisco 4507r Catalyst switch
- Internal Network

So basically, i'm stuck on the dual routers for hardware redundancy.  Does the HSRP provide hardware redundancy?  It's just a protocol right?  But we want something so that if the primary router loses power or gets fried it'll automatically trip over to our standby router.  Is it better to look at somethign like the FatPipe boxes?  

If ya'll see anything that I'm missing (aside from the routers) by all means let me know.  
Question by:wfcraven12
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Accepted Solution

decoleur earned 250 total points
ID: 21746394
I got really involved in answering your question and then I realised that the answer is much less complicated.

HSRP would be used to balance traffic through two routers to the same carrier. You are talking about routing traffic through two different carriers. If you needed redundant paths to the same carrier you r  woul dhave duplicate connections to the same carrier terminating on seperate equipment and would HSRP to provide redunat services.

However in your situation you are providing two carriers, hence your redundancy will be through the routing protocol BGP. The only way to have the same carrier provide services if the carrier's box goes down is if the service is terminated on a different box.

I am assuming of course that you are looking at terminating the t1's onto the 1800's that you are mentioning. FWIW 1800s really cannot handle a whole lot of bandwidth and BGP might be a lot to ask of them.

hope this helps,


Author Comment

ID: 21746556
this definitely helps.  i guess my follow-up question would be then if the 1800's are capable of the hardware redundancy?  unfortunately our ISP dictates the type of router we're getting since the service is managed by them.  i know some of cisco's equipment (like the 515e pix) have the failover interface cards & cables, but i haven't seen anything like that with the 1800 series routers.  

i'm still trying figure out what i can explain our standard course of action would be if we had both T1's going into the router & it has a hardware failure.  

I've attached a VERY crude diagram of what I was considering.  Is this even feasible?




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