• Segment Routing Global Block , on page 667
EVPN VPWS Preferred Path over SR-TE Policy
EVPN VPWS Preferred Path over SR-TE Policy feature allows you to set the preferred path between the two
end-points for EVPN VPWS pseudowire (PW) using SR-TE policy. SR policy allows you to choose the path
on a per EVPN instance (EVI) basis. This feature is supported on bundle attachment circuit (AC), physical
AC, and PWHE (PW-Ether interfaces) AC.
Restrictions
• Only ISIS protocol is supported.
• If EVPN VPWS with On Demand Next Hop (ODN) is configured, and EVPN VPWS with preferred
path is also configured for the same PW, then the preferred-path will take precedence.
• EVPN VPWS SR policy is not supported on EVPN VPWS dual homing.
• L2VPN services over PWHE with EVPN VPWS preferred-path over SR-TE policy is not supported.
• PWHE over SR-TE with Equal-cost multipath (ECMP) paths is not supported.
• EVPN validates if the route is for a single home next hop, otherwise it issues an error message about a
dangling SR TE policy, and continue to set up EVPN-VPWS without it. EVPN relies on ESI value being
zero to determine if this is a single home or not. If the AC is a Bundle-Ether interface running LACP
then you need to manually configure the ESI value to zero to overwrite the auto-sense ESI as EVPN
VPWS multihoming is not supported.
To disable EVPN dual homing, configure bundle-Ether AC with ESI value set to zero.
evpn
interface Bundle-Ether12
ethernet-segment
identifier type 0 00.00.00.00.00.00.00.00.00
/* Or globally */
Evpn
ethernet-segment type 1 auto-generation-disable
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
620
L2VPN Services over Segment Routing for Traffic Engineering Policy
EVPN VPWS Preferred Path over SR-TE Policy
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