Segment Routing

Segment Routing TI-LFA Repair Path Insertion

Before Segment Routing was introduced, IP FRR and Loop-Free Alternates (LFAs) were not widely deployed. In these implementations the level of coverage depended on the network topology. When SR combined with FRR techniques, Fast Reroute can deliver 100% network coverage regardless of the topology. That is called TI-LFA (Topology Independent – Loop Free Alternate) Here …


Segment Routing TI-LFA

Before Segment Routing was introduced, IP FRR and Loop-Free Alternates (LFAs) were not widely deployed. In these implementations the level of coverage depended on the network topology. When SR combined with FRR techniques, Fast Reroute can deliver 100% network coverage regardless of the topology. That is called TI-LFA (Topology Independent – Loop Free Alternate) Here …


Segment Routing Binding SID

Binding SID (BSID) is a method of steering traffic into an SR Policy. BSID is used to provide greater scalability. The BSID is bound to an SR Policy which may have a list of SIDs. Any packets received with an active segment equal to BSID are steered onto the bound SR Policy. Usage of BSID …


Segment Routing Policy

Segment Routing IGP Adjacency SID

IGP Adjacency Segment Identifier (Adj-SID) is a local label allocated from SRLB. It is attached to a unidirectional adjacency or a set of unidirectional adjacencies. Segment Routing Adj-SIDs usually represent a link (peering) and have a local significance. Of course It is used with Prefix-SID of local node. Locally significant means that the remote nodes …


Segment Routing IGP Prefix SID

Segment Routing divides a network into several segments and assign a segment ID to each segment. A Segment is an instruction that a node executes on the incoming packet; Forward packet according to the shortest path, Forward packet through a specific interface, deliver packet to a given application or service etc. A Segment Identifier (SID) …


SRGB

SR architecture doesn’t have a specific control plane protocol. A routing protocol, ISIS, OSPF or BGP, is generally used to distribute Segment ID information in the network. Segment Ids distributed by IGP are called IGP Segments and those distributed by BGP are called BGP Segments. An IGP Segment ID (IGP SID) is a type of …


Segment Routing Overview

When the whole architecture of routing was designed the idea was sending the packet to the destination by the best path possible. It is achieved based on the routing table build from link-state database which is received from their neighbors. But what if I want to force the packets to go across some other way. …