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Step-by-Step Configuration and Troubleshooting Best Practices for the NGFW, NGIPS and AMP Technologies A Visual Guide to the Cisco Firepower Threat Defense (FTD)
Community Member


hi friends,

i have one asa 5520 in data center,i got internet line from my isp .

they given two wires one is for main line and other one is redundant.they mention that two cables are connected in different switches of their side so if one switch goes off using other cable we can survive, but i need to connect two cables in same firewall . i have totally 13 ips so how i ll connect .

note : my idea is when one cable goes off using other cable it has to work.all ip's in same subnet


Re: redundantancy

Community Member

Re: redundantancy

thank you for ur link.

but i have all ips in same subnet so i cannt use other ip in the same firerwall in other interfaces like 0/2,0/3

it will say error as same subnet

Re: redundantancy

How about creating a "outside" vlan on the ASA and assigning two physical ports to that VLAN?

Community Member

Re: redundantancy

That is the purpose of the redundant interface. You assign the IP address to a (virtual) redundant interface and then assign interfaces to the virtual interface:

interface redundant0

member interface gi0/2

member interface gi0/3

ip address x.x.x.x x.x.x.x


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