@Nash yes, my network is architected as you say, it's the traditional network design. The aggregation layer is a stack of MS425s. However, the OP is only talking about 8 switches, it doesn't seem like a big ask to plug them into the MX. On a side note, our firewall vendor actually advertises the ability the flatten your network and let it do all the internal core functions. We haven't actually done this, but it's pretty tempting when the MS425s are up for replacement. Firewall vendor X supports everything the MS425s are doing. Yes, it's not the customary network design, but the only constant in the IT world is change.
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