Source Packet Routing in Networking (SPRING) or Segment Routing

Support for SRv6 micro-SIDs in IS-IS transport (ACX Series)—Starting in Junos OS Evolved Release 23.2R1, you can compress multiple Segment Routing for IPv6 addresses into a single IPv6 address (micro-SID). Typically if a packet needs to traverse multiple nodes, IS-IS can stack up the SRv6 SIDs using a segment routing header. This stacking of SIDs adds to the bandwidth overhead and the segment routing header processing overhead.

You can now compress the SID list to a single destination address (the micro-SID) and reduce the bandwidth overhead. Segment routing headers can typically allow a stack of only six SRv6 SIDs. For use cases that need to include more than six SRv6 SIDs, micro-SIDs can help in compressing multiple IPv6 addresses.

See [How to Enable SRv6 Network Programming in IS-IS Networks.]