Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

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.

share|improve this question

1 Answer 1

I have the same configuration: two Layer 2 connections to the data center provider, and a single gateway IP address.

You don't need RSTP to make this work. Instead, you can put the ASA's in to active/passive failover mode. When the primary fails, the backup will assume your external IP and continue working. The data center will just see this as the device moving to a different switchport.

share|improve this answer
    
I had seen some ASA's supported A\A or A\P HA, however, the 5505 is the lowest range and I don't think supports HA natively. I was looking at the 5505 due to our low bandwidth requirements and for budget reasons. –  Ross Buggins Nov 28 '12 at 14:49
    
You're right. I didn't realize that the 5505's don't support failover. –  longneck Nov 28 '12 at 15:07
    
Although, since I wrote the last comment I've just had someone tell me that with the security plus licence it supports Active Passive. I haven’t had it confirmed yet. –  Ross Buggins Nov 28 '12 at 15:24

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.