ISIS Segment routing basics for Arista EOS References:
https://www.arista.com/en/um-eos/eos-section-35-3-is-is-segment-routing
SRGB Segment Routing Golbal Block
Prefix-SID It’s global and unique. It identify a prefix. It’s called anycast SID when it’s send by a group of router.
Node-SID It’s global and unique. Only one per node. It identify the node.
Adjacent-SID It’s local and can use a dynamique range. It’s used to identify an interconnection between 2 nodes.
With Arista EOS 4.