Group ID 0x203f1e0 0x880
Interface PW-Ether10001 TenGigE0/0/0/0/6.10001
MTU 1500 1500
Control word disabled disabled
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
EVPN VPWS On-Demand Next Hop with SR-TE
The EVPN VPWS On-Demand Next Hop with SR-TE feature enables you to fetch the best path to send traffic
from the source to destination in a point-to-point service using IOS XR Traffic Controller (XTC). On-Demand
Next Hop (ODN) with SR-TE is supported on EVPN Virtual Private Wire Service (VPWS) and VPWS with
pseudowire headend (PWHE).
When redistributing routing information across domains, provisioning of multi-domain services (Layer2 VPN
and Layer 3 VPN) poses complexity and scalability issues. ODN with SR-TE feature delegates computation
of an end-to-end Label Switched Path (LSP) to a path computation element (PCE). This PCE includes
constraints and policies without any redistribution. It then installs the reapplied multi-domain LSP for the
duration of the service into the local forwarding information base(FIB).
ODN uses BGP dynamic SR-TE capabilities and adds the path to the PCE. The PCE has the ability to find
and download the end-to-end path based on the requirements. ODN triggers an SR-TE auto-tunnel based on
the defined BGP policy. The PCE learns real-time topologies through BGP and/or IGP.
IOS XR Traffic Controller (XTC)
The path computation element (PCE) describes a set of procedures by which a path computation client (PCC)
reports and delegates control of head-end tunnels sourced from the PCC to a PCE peer. The PCE peer requests
the PCC to update and modify parameters of LSPs it controls. It also enables a PCC to allow the PCE to
initiate computations and to perform network-wide orchestration.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
650
L2VPN Services over Segment Routing for Traffic Engineering Policy
Associated Commands
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