Segment routing control plane

Segment routing control plane | Segment routing control plane consist of routing protocols to distribute segment id in the network. SR control plane is specified for IGP protocols IS-IS and for Border gateway protocol (BGP).

Segments distributed by IGP are called IGP segments and those distributed by BGP are called BGP segments.  There are two types of IGP segments ,

1. IGP Prefix Segment – It is distributed by either ISIS or OSPF . IGP prefix segment is associated with prefix advertised by IGP. It signify steer traffic along ECMP aware shortest path to the prefix associated with this segment. Prefix segment is fundamental building block of segment routing .Typically, Prefix segment is identified by Node-SID which is Global  unique in the network , assigned to the loopback address of the node.

2. IGP Adjacency Segment – This type of segment is associated with unidirectional adjacency of IS-IS or OSPF.  It signify  to steer traffic  out to link of the adjacency (ISIS or OSPF) of the segment . Traffic is always steered on the link regardless of shortest path routing. Adjacency segment is local significant to the node of the segment.

And there are two types of BGP segments,

3. BGP Prefix Segment – BGP prefix segment is associated with BGP prefixes , similar to IGP prefix segment associated with IGP prefixes. It signify steer traffic along  the ECMP aware BGP multi-path to the prefix associated with this segment.

4. BGP Peer Segment – BGP peer segments are associated with BGP Peering session to a specific  neighbour . BGP peer segments are applicable  to both IBGP and EBGP.

Comment Here

%d bloggers like this: