sraghunandan is right, two thin takes in consideration:
HA3 bandwidth: depend of you load balancing method and your election (setup owner / Setup setup) method => need to mpnitor
HA3 backup: if your HA3 link is down your cluster ... is not healthy. The only way for HA3 ha is aggregate.
Then in my ming: better to have 3 to 5G with agg then only one 10gG.
According to the HA-active-active-technote:
The HA3 link is used for packet forwarding between the session owner and the session setup device in an active-active cluster. HA3 link is a layer2 link and uses MAC-in-MAC encapsulation. Aggregate interfaces can be configured as a HA3 link on the PA-5000 and PA-4000 Series. This also provides redundancy of HA3 link. The interface that will be used as HA3 link must be set as type HA
Note: No backup links can be configured for the HA3 link. Use the aggregate interface on the PA-5000 and PA-4000 series if redundancy is required.
This gives if you use multiple 1G interfaces as aggregation for HA3 in an active-active setup where the up/downlinks are 10G then each session through the PA-cluster might be limited to max 1Gbit/s depending on if HA3 is used in the flow or not. In this case you could check if you can setup the two PA devices as independent VWIRE instead and let the router/switch before/after the PA-cluster run portchannel and "loadbalance" the sessions so its loadbalanced on dstip one way and srcip the other way.
I'm thinking about setting up 4-1G port as my aggregate setup to my edge switch. My issue is understanding layer 2 adjacent which needs to be setup on the switch and what's going across my link to the other data center, what triggers the sync, and how much data is going across this link?
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