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 …
SRH is a new type of IPv6 Routing Extension Header and it includes SRv6 SIDs. It may include a Segment List encoded as an IPv6 Address. It is not an exact IPv6 address. You may think like it is just a format and we will call it SRv6 SID. Format is IPv6 address but in …
As you know, Segment Routing can be applied to the IPv6 data plane by using routing extension headers. SRH is a new type of IPv6 Routing Extension Header which includes one or more SRv6 SID inside. These SRv6 SIDs have locator and function fields and they used for traffic engineering, vpn services, service function chaining …
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 …
An SR Policy is used to instantiate an ordered list of segments. A Segment is and 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) identifies a Segment. And …
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 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) …
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 …