09-13-2019 08:07 AM - edited 02-21-2020 09:29 AM
Hello,
I've built a reasonable large topology in GNS3 to show use of a variety of layer 2 and 3 technologies, with just a touch of ASA or enough to demonstrate ASA basics and setup of a site-to-site VPN. As a result and most importantly because I can't really afford any more CPU cycles(!), I have a single ASA connecting my layer 2 block to the edge router running BGP.
Is there a way in which I can connect the ASA to the two distribution switches running HSRP for two VLANs? As I say, I just don't want to undo my hard work and time by pushing GNS any more.
I've read a few responses to a similar question whereby a simple switch between the distros and ASA is the solution, presumably keeping things layer 2 between the new switch and the distribution switches?
How can I achieve this and also ensure that traffic will be returned to the current HSRP active device?
Thanks in advance.
Many thanks.
Solved! Go to Solution.
09-13-2019 09:38 AM
For this scenario it doesn't matter if you have one ASA or two in HA. In most cases I would just ignore this "problem" when both switches are directly colocated and have a direct link (typically a channel) between each other. It's just one switched hop more than the optimal path. Or you have to build your distribution as a VSS/VPC or stack. There you can use EtherChannels to both devices.
09-13-2019 08:52 AM
You can configure a redundant interface on the ASA and add one member-interface connecting to SW1 and one member-interface connecting to SW2. The redundant interface also can have sub interfaces for all your needed VLANs. But as ASA and the Switch don't share any information which switch is HSRP-active, you could have a non-optimal traffic flow.
09-13-2019 08:58 AM
09-13-2019 09:38 AM
For this scenario it doesn't matter if you have one ASA or two in HA. In most cases I would just ignore this "problem" when both switches are directly colocated and have a direct link (typically a channel) between each other. It's just one switched hop more than the optimal path. Or you have to build your distribution as a VSS/VPC or stack. There you can use EtherChannels to both devices.
09-13-2019 09:57 AM
09-13-2019 10:29 AM
09-13-2019 09:20 AM
09-13-2019 09:27 AM
09-13-2019 09:29 AM
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