12-02-2013 03:37 AM - edited 03-11-2019 08:11 PM
Hi all,
I'am preparing a failover implementation of our ASA 5520, we have two builduing A and B, between them i have onlly one fibre cable available : i will connecte with it a 3750 on each side, and i will use a UTP cable to connect the ASA on a dedicated physical interface.
the goal of this scenario is offering the maximum redundancy betweend equipement with just the exsistanet equipements, for exemple : if devices on buidl A fail then traffic will pass trough Building B and so on, (except for the WAN routers).
I reorgnised the actual configurations on all equipement, and i got the optimesed schema in the picture bellow :
i have two link between the CDR (4500) and the ASA :
here is a part of the configuration on the firts ASA:
failover
failover lan unit primary
failover lan interface FOLINK GigabitEthernet2.1
failover polltime unit 1 holdtime 3
failover link FOSTATE GigabitEthernet2.2
failover interface ip FOLINK 192.168.1.1 255.255.255.0 standby 192.168.1.2
failover interface ip FOSTATE 192.168.2.1 255.255.255.0 standby 192.168.2.2
interface GigabitEthernet2.2
description STATE Failover Interface
vlan 201
ASASecondary(config)# sh run int g2.1
!
interface GigabitEthernet2.1
description LAN Failover Interface
vlan 200
failover
failover lan unit secondary
failover lan interface FOLINK GigabitEthernet2.1
failover polltime unit 1 holdtime 3
failover link FOSTATE GigabitEthernet2.2
failover interface ip FOLINK 192.168.1.1 255.255.255.0 standby 192.168.1.2
failover interface ip FOSTATE 192.168.2.1 255.255.255.0 standby 192.168.2.2
interface GigabitEthernet2.2
description STATE Failover Interface
vlan 201
ASAProduction(config)# sh run int g2.1
!
interface GigabitEthernet2.1
description LAN Failover Interface
vlan 200
Problem :
Questions:
thank you in advance.
Regards
12-02-2013 10:10 AM
Hello,
It looks good, I mean I guess you will use HSRP on the internal L3 domain for more redundancy right?
No, the configuration is good.
Yes, Cisco actually recommends to use a switch between the failover units, what you need to make sure is that the traffic will go through the switch. Check the Vlan setup on the switch and the access-port definition bud.
Rate all of the helpful posts!!!
Regards,
Jcarvaja
Follow me on http://laguiadelnetworking.com
12-03-2013 02:04 AM
Hi Julio and thanks for the answer,
After more reflexion, I changed the scenario to the new bellow; I decided to place the two asa in the same building since I have a problem with insufficient cables.
So, for the new scenario, I used port channels on both sides of switches connected successively to the ASAs, I have just a direct question:
Will the scenario work on just with the failover configuration or should I need to add HSRP config as you said? I guess I don’t need it, but I need a confirmation to avoid surprises while deploying.
The goal also for this implementation is to assume redundancy and load balancing firewall, is this schema will offer these goals.
Thanks you all in advance for your answers.
12-03-2013 08:42 AM
Hello Hicham,
I mean this will certanly work but the thing is you will now have a single point of failure at the Core level.
If The Switch that connects to the ASA goes down bum the entire network is down. I liked the previous scenario before.
Rate all of the helpful posts!!!
Regards,
Jcarvaja
Follow me on http://laguiadelnetworking.com
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