Name: Cisco ASR 9000 Series
Brand: Cisco
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EVI Ethernet Segment Id EtherTag Nexthop Label SRTE IFH

----- ------------------------ -------- --------------------------------------- --------

----------

2 0000.0000.0000.0000.0000 1 205.3.0.3 24000 0x5a0

Source: Remote, MPLS

Associated Commands

• adjacency-sid

• index

• prefix-sid

• router isis

• segment-routing

The applicable segment routing commands are described in the Segment Routing Command Reference for

Cisco ASR 9000 Series Routers

Related Topics

• Overview of Segment Routing , on page 665

• How Segment Routing Works , on page 666

• Segment Routing Global Block , on page 667

Overview of Segment Routing

Segment Routing (SR) is a flexible, scalable way of doing source routing. The source chooses a path and

encodes it in the packet header as an ordered list of segments. Segments are identifier for any type of instruction.

Each segment is identified by the segment ID (SID) consisting of a flat unsigned 32-bit integer. Segment

instruction can be:

• Go to node N using the shortest path

• Go to node N over the shortest path to node M and then follow links Layer 1, Layer 2, and Layer 3

• Apply service S

With segment routing, the network no longer needs to maintain a per-application and per-flow state. Instead,

it obeys the forwarding instructions provided in the packet.

Segment Routing relies on a small number of extensions to Cisco Intermediate System-to-Intermediate System

(IS-IS) and Open Shortest Path First (OSPF) protocols. It can operate with an MPLS (Multiprotocol Label

Switching) or an IPv6 data plane, and it integrates with the rich multi service capabilities of MPLS, including

Layer 3 VPN (L3VPN), Virtual Private Wire Service (VPWS), Virtual Private LAN Service (VPLS), and

Ethernet VPN (EVPN).

Segment routing can be directly applied to the Multiprotocol Label Switching (MPLS) architecture with no

change in the forwarding plane. Segment routing utilizes the network bandwidth more effectively than

traditional MPLS networks and offers lower latency. A segment is encoded as an MPLS label. An ordered

L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x

665

L2VPN Services over Segment Routing for Traffic Engineering Policy

Associated Commands

Cisco ASR 9000 Series Configuration Guidelines

Other manuals for Cisco ASR 9000 Series