We are looking to increase our capacity and redundancy to the internet. We will have 2 ISP with 2 10Mbit fiber connections handing off to us with a 10/100 fast Ethernet. These connections will be terminated in 2 different building connected by our fiber (24 strands). We will be running BGP with both providers but only accepting peers connected to the ISPs and a default route to everything else. Internally HSRP will be used for redundancy from an active/passive ASA firewall cluster. Each router will connect into a 3560 switch. The 3560?s will each connect to one of the ASAs and each other. We would also like the 2 routers to connect to each other so that we could have one of the switches fail and still use the full capacity of both links.
1) Which series/model should we be looking at for our router? I was thinking a 2851. The router would have to be able handle traffic for both connections assuming one of the 3560 failed and the other router was forwarding traffic through it. It will also need to be able to have at least one other interface added to it (see question 2).
2) Instead of using a fiber HWIC to connect the two routes to each other could we instead add another 10/100 Ethernet port with media converters to fiber. This is being done for cost. Are there any disadvantages to this route other than we have increased the number of devices for the connection from 2 to 4.
3) For the 3560 we were looking at the 8 port model with the single SFP slot. The reason for this is to lower cost/wasted ports and it has the longest mean time between hardware failures for the 3560 series since it doesn?t have a fan. Pros/Cons?