pro's and con's of combining isp

I am looking for pro's and con's of using Verizon Fios and Comcast cable internet (both around 40 -50meg each) in a combined enviroment for speed as well as redundancy in case we lose one service.
Currently we have a 12 meg internet service going thru a Cisco 3845.
My concern is there are no SLA's for eithier Verizon and Comcast but the price is 1/10th the price. Are there any major issues with going to this new setup?
Thanks for your advice
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If you are using such big bandwidth, it's always advisable for a dual setup.

The main difference between verizon and comcast would be the dilution. That's why there is a price diff. You cannot control that. Same b/w one isp serving 2 customers, the other one serving 10. So preferably you would notice a difference in throughput between the 2. (even if they are of same capacity).

When you will have 2 isp's you need to load balance using ospf/eigrp/ibgp and do a fallback config so that if one link is going down, the traffic gets shifted to other link. You might want to use ip sla monitor command to monitor the 2 links and if one is having issue failback to the second.


kubota1981Author Commented:
I did not mean to confuse the issue with the 2 ISP's. We currently have a 12 meg pipe from Quest that has a service level agreement and a 5K price tag. We are looking to get 1 Verizon Fios link and 1 Comcast Link and merging them together for a price of 1/10th of the quest price.  We currently use EIGRP and will look into the fallback config. The fallback config will work without intervention? In other words one ISP goes down the traffic will get routed to the other working ISP?  
Also Do I need to worry about sending certain protocols through a specific ISP? I dont believe any of them filter bu8t not 100% sure.
Thanks again for the advice
actually, ask VzB and comcast what will be their dilution ratio. e.g if right now qwest gives you 8 meg throughput in 12 meg and if combining comcast and VzB gives you 6 meg, then you have to calculate the cost effectiveness, since speed change will affect your business. There will be a definite speed degradation. Remember they are doing business and not charity, if you opt to pay less expect less performance. $$$ matters.

In any case, with 2 isp's if you combine, you can use at will. One isp takes over when another goes down. It can be done.

Filtering, no one can answer that except the existing customers and the ISP. You have to ask them to be sure. Some isp's do filter. Unless it's not something like bittorrent, they won't block.


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kubota1981Author Commented:
quest = 12mb internet @ $5k /month
Verizon buisness class Fios = 50mb internet @ $200/month
Cable less speed for about $200 /month

I am sure3 we will not get the level of service from Verizon as we did with quest but that goes along with the $$$.
Thanks for your help and will look into the solutions listed. Thanks again
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