Another option would be conditional advertisement, which would be a more solid way of making certain no-one uses the /20 from site a. You could set it up using route maps so the only time the /20 is advertised from site a is when the link between site b and the ISP is removed from the routing table on the site a edge router.
On your first option - If I only include the /20 in acl 10, I wont be also advertising the /24's that need to come in via the respective sites? (The /20 will encompass them, but it wont gaurantee that traffic destined for them will come in via the links that I wont them too)
And on option b - This looks much more elegant! - But how am I going to determine from Site A, that Site B's Upstream link is there or not?
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
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