There will be NO impact to HKIX participants which have BGP sessions with both IPv4 route servers RS1 (123.255.88.1) & RS2 (123.255.88.2) and both IPv6 route servers RS1 (2001:7FA:0:1::CA28:A101) & RS2 (2001:7FA:0:1::CA28:A102).
During the maintenance, your BGP session(s) with one route server may be up and down but your BGP sessions with the another route server will NOT be affected and the multi-lateral peering can still be maintained. If you have not set up the IPv4 and IPv6 BGP sessions with both RS1 & RS2, you should do it ASAP for better resilience.
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