Connect 2 ISP on One ASA

Unanswered Question
Oct 22nd, 2009

Hi All, We have ASA 5520 connected with One ISP on Outside and to Switch on Inside. How to connect Second ISP to the ASA.

I have this problem too.
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fvanlancker Thu, 10/22/2009 - 11:20

Do you want one ISP as backup ?

if so, you could use HSRP on the ISP routers and just add a default route to the vip address on the asa.

Or, you could create static routes on the asa with tracking. If the routes fails it will bring the route to your standby ISP active.

joe.marcelo9 Thu, 10/22/2009 - 11:38

We need traffic to go on both ISP link, to do loadbalancing and failover.

We got Ethernet connection so remove ISP router. Connection is directly on ASA outside interface.

My ISP said terminate both links on L2 Switch and make a trunk to ASA. [I didnt understood what this means]

fvanlancker Thu, 10/22/2009 - 11:48

ok, than you have 2 vlans on your trunk, with two isp's connecting to switch. Still you need routing towards the two isp's.

joe.marcelo9 Thu, 10/22/2009 - 12:02

ISP advice trunk once we get second ISP Link. I dont have any vlan.

Can't I terminate both links on ASA, if not then what is recommended.


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