It's not fully clear to me what your scaling limitition issue is. You describe seven 48 port line cards combined (which might be a 6509 with dual sups) but unclear how 15 sup32 switches are involved as a limit. What's the 15 limitation based on?
Assuming edge swithes used dual sup32-10GEs in a 6513 with eleven 48 port cards, that would provide 528 10/100/1000 edge ports per chassis. If you used two of the 10 gig uplinks, a 6509 with dual sup720s and using seven 16 port 10 gig cards, would support 112 10 gig ports, or about 56 edge switches. This then is about 29,568 edge ports off one aggregation switch.
Since you mentioned you're using STP and not Etherchannels, you could have two or more aggregation switches at either data center and increase your edge ports (similar to what you've done across the two data centers).
If you did use Etherchannel, then VSS would become important since Etherchannel is between the logical devices. I.e. VSS would allow you to double your port count when using Etherchannel. (NB: VSS has supported less service modules than non-VSS. You would need to check whether your FW and LB modules are supported.)
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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