CISCO ASR 1000 Series Aggregation Services Routers User Guide
- June 14, 2024
- Cisco
Table of Contents
ASR 1000 Series Aggregation Services Routers User Guide
EVPN VPWS over SR-TE Preferred Path
The Ethernet VPN Virtual Private Wire Service (EVPN VPWS) functionality
implements the signaling and encapsulation techniques for establishing an EVPN
instance between a pair of PEs. This enhancement extends
EVPN VPWS to support the specification of an SR-TE policy using the preferred
path feature.
- Feature Information for EVPN VPWS over SR-TE Preferred Path, on page 1
- Restrictions for EVPN VPWS over SR-TE Preferred Path, on page 1
- Information About EVPN VPWS over SR-TE Preferred Path, on page 2
- How to Configure EVPN VPWS over SR-TE Preferred Path, on page 2
- Verifying EVPN VPWS over SR-TE Preferred Path , on page 3
Feature Information for EVPN VPWS over SR-TE Preferred Path
The following table provides release information about the feature or features
described in this module. This table lists only the software release that
introduced support for a given feature in a given software release train.
Unless noted otherwise, subsequent releases of that software release train
also support that feature. Use the Cisco Feature Navigator to find information
about platform support and Cisco software image support.
To access the Cisco Feature Navigator, go to
www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Table 1: Feature Information for EVPN VPWS over SR-TE Preferred Path
| Feature Name | Releases | This feature was introduced. |
|---|---|---|
| EVPN VPWS over SR-TE Preferred Path | Cisco IOS XE Cupertino 17.7.1a | Feature |
Information
Restrictions for EVPN VPWS over SR-TE Preferred Path
- SR On-Demand Next Hop (ODN) policy is not supported; only SR static policy is supported.
- SR Per-Flow Policy (PFP) is not supported; only SR Per-Destination Policy (PDP) is supported.
- Interior Gateway Protocol (IGP) is Intermediate System-to-Intermediate system (IS-IS).
Information About EVPN VPWS over SR-TE Preferred Path
The EVPN VPWS functionality implements the signaling and encapsulation techniques for establishing an EVPN instance between a pair of PEs. This enhancement enables EVPN VPWS to support the specification of an SR-TE policy using the preferred path feature. This feature includes the fallback disable option, which disables the default behavior of falling back on an alternate path if the preferred path is down. The following figure illustrates the architecture:
How to Configure EVPN VPWS over SR-TE Preferred Path
The following sections provide information about the tasks involved in
configuring EVPN VPWS over the SR-TE preferred path.
Configuring EVPN VPWS over SR-TE Preferred Path
The following example shows how to enable EVPN VPWS over the configured SR-TE
preferred path:
l2vpn evpn instance 100 point-to-point rd 100:100 route-target export 100:100
route-target import 100:100 ! vpws context vc100 preferred-path segment-
routing traffic-eng policy p-100 service target 100 source 100 interface
GigabitEthernet0/0/3 service instance 100 ethernet encapsulation dot1q 100
Configuring EVPN VPWS over SR-TE Preferred Path with Fallback Disable
The fallback disable command prevents a device from using the default path if
the preferred path SR policy goes down.
l2vpn evpn instance 100 point-to-point rd 100:100 route-target export 100:100
route-target import 100:100 vpws context vc100 service target 100 source 100
member GigabitEthernet0/0/3 service-instance 100 preferred-path segment-
routing traffic-eng policy p-100 disable-fallback Removing Fallback Disable
from EVPN VPWS over SR-TE Preferred Path The following example shows how to
remove the fallback disable option in EVPN VPWS over SR-TE preferred path:
l2vpn evpn instance 100 point-to-point vpws context vc100 preferred-path
segment-routing traffic-eng policy p-100
Disabling EVPN VPWS over SR-TE Preferred Path Configuration
The following example shows how to disable the EVPN VPWS over SR-TE preferred
path configuration: l2vpn evpn instance 100 point-to-point vpws context vc100
no preferred-path segment-routing traffic-eng policy p-100 disable-fallback
Verifying EVPN VPWS over SR-TE Preferred Path The following sample outputs
show how to to verify the EVPN VPWS over SR-TE preferred path and fallback
disable configurations.
-
The following is a sample output showing the EVPN VPWS configuration over an SR-TE preferred path: device# show l2vpn evpn vpws VC ID 100 detail EVPN name: vc100, state: up, type: point-to-point EVPN ID: 100 VPWS Service Instance ID: Source 1, Target 2 Labels: Local 17, Remote 17 Next Hop Address: 6.6.6.6 Associated member interface Gi0/0/3 up, Gi0/0/3:3000 status is up Output interface: Tu65536, imposed label stack {16016 17} Preferred path: active Default path: ready device# show l2vpn evpn vpws vc preferred-path Tunnel EVPN ID Source Target Name Status ————- —— ——– ——– ——– ———- Tunnel65536 100 1 2 vc100 up
-
The following is a sample output showing the EVPN VPWS configuration over an SR-TE preferred path, with fallback disabled: device# show l2vpn evpn vpws VC ID 100 detail EVPN name: vc100, state: up, type: point-to-point EVPN ID: 100 VPWS Service Instance ID: Source 1, Target 2 Labels: Local 17, Remote 17 Next Hop Address: 6.6.6.6 Associated member interface Gi0/0/3 up, Gi0/0/3:3000 status is up Output interface: Tu65536, imposed label stack {16016 17}
Preferred path: active Default path: disabled Dataplane:
SSM segment/switch IDs: 25037/12290 (used), PWID: 1 Rx Counters 1241 input transit packets, 463266 bytes 0 drops Tx Counters 828 output transit packets, 402840 bytes 0 drops 24 VC FSM state transitions, Last 10 shown
DpUp: Act -> Est, Mon Sep 06 23:32:43.809 (2w2d ago)
RemDn: Est -> RemWait, Mon Sep 06 23:32:43.809 (2w2d ago)
RemUp: RemWait -> Act, Mon Sep 06 23:32:43.816 (2w2d ago)
DpUp: Act -> Est, Mon Sep 06 23:32:43.816 (2w2d ago)
DpDn: Est -> Act, Mon Sep 06 23:35:57.944 (2w2d ago)
DpUp: Act -> Est, Mon Sep 06 23:43:50.071 (2w2d ago)
DpDn: Est -> Act, Mon Sep 06 23:46:15.361 (2w2d ago)
DpUp: Act -> Est, Mon Sep 06 23:54:11.508 (2w2d ago)
DpDn: Est -> Act, Tue Sep 07 00:00:11.248 (2w2d ago)
DpUp: Act -> Est, Tue Sep 07 00:06:27.355 (2w2d ago) -
The following is a sample output showing the EVPN VPWS configuration over an SR-TE preferred path, with fallback disable option removed: device# show l2vpn evpn vpws VC ID 100 detail EVPN name: vc100, state: up, type: point-to-point EVPN ID: 100 VPWS Service Instance ID: Source 1, Target 2 Labels: Local 17, Remote 17 Next Hop Address: 6.6.6.6 Associated member interface Gi0/0/3 up, Gi0/0/3:3000 status is up Output interface: Tu65536, imposed label stack {16016 17}
Preferred path: active Default path: ready -
The following is a sample output showing the EVPN VPWS configuration over an SR-TE preferred path disabled: device# show l2vpn evpn vpws VC ID 100 detail EVPN name: vc100, state: up, type: point-to-point EVPN ID: 100 VPWS Service Instance ID: Source 1, Target 2 Labels: Local 17, Remote 17 Next Hop Address: 6.6.6.6 Associated member interface Gi0/0/3 up, Gi0/0/3:3000 status is up Output interface: Gi0/0/0, imposed label stack {16 16} Preferred path: not configured Default path: active
EVPN VPWS over SR-TE Preferred Path
Documents / Resources
|
CISCO ASR 1000 Series Aggregation Services
Routers
[pdf] User Guide
ASR 1000 Series, ASR 1000 Series Aggregation Services Routers, Aggregation
Services Routers, Services Routers, Routers
---|---
|
CISCO ASR 1000 Series Aggregation Services
Routers
[pdf] User Guide
ASR 1000 Series Aggregation Services Routers, ASR 1000 Series, Aggregation
Services Routers, Services Routers, Routers
References
- Cisco Security Products and Solutions - Cisco
- Support - Cisco Support and Downloads – Documentation, Tools, Cases - Cisco
- Cisco IOS IP Addressing Services Command Reference - Cisco