With the diagram below as an example.. can anyone comment on the efficiency of this design, and/or a better method.
With the objective in the diagram for simple and best use L3 A and L3 B switch a default route towards the routers interface,as you want have L3 A as active for all vlans use HSRP with making L3 A pirority as high for all vlans.so when ever traffic comes to L3 A all traffic will be routed via L3A and peer end interface of router.
Configure etherchannel between L3A and L3B as both are cisco so pagp may be prefered,but you have multiple point of failure are having in your current setup,like if your router goes down then no traffic can pass in /out and as your server are having single nic connected with L3A or L3B at this point if L3 A goes down then server connected with L3 A cannot be communcated with network unless a manual intervention from administrator.
so if possible to avoid breakage at server level try to have dual nic connecting with two different switches with teaming configured at server level.
Hope to Help !!
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