I have the follwoing setup:
2 companies trying to connect via 2 LES10 circuits (diverse for redundancy) Bothe LES10 circuits go into a VLAN on a 3500xl at each end. These two LES10 circuits will be etherchanneled. Servers at either company talk to each other via a checkpoint firewall which has one interface going into the same vlan on their respective 3500 XL switches. The setup is as attachment.
My question is this: will all traffic always go across the same LES 10 as there is only one source and dst mac involved (checkpoints) for comms? Is there anyway to balance this traffic with the present setup?
In answer to your question no the etherchannel would not have to have an IP address. It can be layer 2.
When you load balance on the source and IP address you are talking about the client ip address and the server ip address not any IP addresses on the switch. So a layer 2 etherchannel can quite happily load balance on src/dst IP address.
When you load balance on src/dst IP address this is not a layer 3 decision, the traffic is still switched at layer 2, the IP information is only used to decide which link within the etherchannel to send it on.