I'm looking at moving to colocation and one area being discussed is networking redundancy. I can get a dual feed from a two different datacentre switches configured with Rapid Spanning Tree Protocol to give me an active passive supply.
I'm looking at using the Cisco ASA 5505 as a firewall. If I get two and put them in transparent mode, should I be able to put them 'in line' before my switches and the RSTP pass through ok and remove the loop?
I realise that I would have to keep the configuration between them in sync manually.
If this is possible, but considered to be a bad idea, what alternatives exist for a low cost HA firewall solution.
EDIT: I'd just want to add for clarification that I was looking to make sure my hardware was redundant i.e. two firewalls, not just having 2 network links from the datacentre through a single firewall.