we are doing BGP multi-homing and have to have a /22 APNIC IP pool. The requirement is for site to site VPN, outside firewall machines etc.
I would like to know what are the best practices for advertising the /22 on the internet and the possible IP scheme between my router and firewall. I have thought of using ISP1 as the primary for a /23 and ISP2 for teh remaining /23.
Don't forget to tell both ISP to permit /22 because if you tell them that you are advertising only /23, they will put an ACL in the interface of their router connected to your router or a prefix-list for incoming prefix originating from your router just for /23. In the future, you may change your configuration advertising the whole /22 or you swap the advertisement between two ISP, then you will have a problem that you may not immediately see the root cause.
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