My company has multiple IT groups, AS # and ISP's. Yes, the age of mergers and acquisitions. For simplicity, Company A advertises it's publicy routed network through AS# 1 and ISP X. Company B advertises it's publicly routed networks through AS# 2 and ISP y. Company A now wants to share company B's internet pipe while still retaining it's own AS# and publicly routed server, in essence, using company B as a transit. The question is, will this be possible? Many ISP's only allow only contractual AS# to traverse it's network. Will company B's ISP allow company A's AS# to pass through its network? Would it be easier to eliminate Company A's AS# and migrate any DMZ server to Company B's network?
There's a nifty little feature that is designed exactly for the circumstances you described here. It allows the use of a local AS# that is different to that expected by the ISP. Here's a document with more details:
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