A Network Architect’s Guide to 5G by Syed Farrukh Hassan & Alexander Orel & Kashif Islam

Author:Syed Farrukh Hassan & Alexander Orel & Kashif Islam [Syed Farrukh Hassan]
Language: eng
Format: epub
Publisher: Addison-Wesley Professional
Published: 2022-05-18T00:00:00+00:00

SRv6: Uses the IPv6 destination address field and additional IPv6 routing headers to express SIDs.4, 5

Figure 6-2 shows the SID expression in SR-MPLS and SRv6 packets. The SRv6 concepts will be introduced later in this chapter, while this section’s focus is on SR-MPLS.

FIGURE 6-2 Segment ID (SID) Representation in SR-MPLS and SRv6

A number of different segment types and SIDs are defined by the Segment Routing Architecture IETF standard; some are global, while others have local significance:6

Prefix-SID: This is one of the most common SIDs used in SR and serves as an identifier for the IGP-Prefix segment, an instruction to reach a specific IGP prefix. How this IGP prefix is reached is not explicitly specified, and if multiple equal-cost paths to this prefix exist, all of them can be used simultaneously; that is, Equal Cost Multi Path (ECMP) is used. The Prefix-SID is a global SID and can be recognized by any SR-capable router in an IGP domain. It is akin to an instruction such as “walk to the intersection of streets A and B.”

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