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Cisco ASR 900 Series User Manual

Cisco ASR 900 Series
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Traffic loss is expected and acceptable until the restore LSP is signaled and established.Note
When the primary LSP recovers, traffic is automatically switched back to the primary LSP (make-before-break
scenario) and restore LSP is torn down. If the sticky option is configured in the path option, protect LSP can
recover before the primary LSP. In this case, traffic reverted to the protect LSP and the restore LSP is torn
down.
To enable restore LSP for a tunnel, configure the restore path option under the tunnel interface using the
command:
tunnel mpls traffic-eng path-option restore <index> [dynamic | explicit]
Multiple restore path options can be configured on a tunnel. However, only the restore path option with the
same index as the path option used by primary LSP is used for establishing the restore LSP. For example,
after primary and protect LSPs associated with the path option index X are administratively down, restore
LSP is signaled using the restore path option with index X, if it is configured. Else, no restore LSP is signaled.
Restore path option is supported for unidirectional, bidirectional co-routed, or non co-routed tunnels. It
is not supported for lockout, sticky, and non-revertive modes.
Note
Configuring the Restore Path Option
tunnel mpls traffic-eng path-option restore <index> [dynamic | explicit]
Router(config-if)# tunnel mpls traffic-eng path-option ?
<1-1000> preference for this path option
protect a path protection setup option
restore a path restore setup option
Verifying the Restore Path Option
The following is an example of the information displayed for the tunnel when restore LSP is carrying traffic:
Router# show mpls traffic-eng tunnels Tunnel 100
Name: iolA_t100 (Tunnel100) Destination: 192.168.1.4
Status:
Admin: up Oper: up Path: valid Signalling: connected
path restore option 1, type dynamic (Basis for Restore, path weight 40)
path option 1, (LOCKDOWN & STICKY) type dynamic
Path Protection: Requested
path protect option 1, (LOCKDOWN & STICKY) type diverse
Path Restore: Restore lsp in use.
path restore option 1, type dynamic (Basis for Restore, path weight 40)
Lockout Info:
Locked Out: No
Router# show running-config interface tunnel 1000
Building configuration...
Current configuration: 675 bytes
!
interface Tunnel1000
ip unnumbered Loopback0
tunnel mode mpls traffic-eng
tunnel destination 56.6.6.6
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng priority 7 7
tunnel mpls traffic-eng bandwidth 200
tunnel mpls traffic-eng path-option 10 dynamic lockdown sticky
MPLS Basic Configuration Guide, Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
164
Flex LSP Overview
Restore Path Option

Table of Contents

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Cisco ASR 900 Series Specifications

General IconGeneral
Product FamilyASR 900 Series
CategoryNetwork Router
Connectivity TechnologyWired
Switching CapacityVaries by model
MemoryVaries by model
Operating SystemCisco IOS XE
DimensionsVaries by model
WeightVaries by model
Form FactorModular
Supported InterfacesEthernet, Gigabit Ethernet, 10 Gigabit Ethernet, T1/E1, T3/E3, OC-3/STM-1, OC-12/STM-4, OC-48/STM-16
PortsVaries by model
Data Link ProtocolEthernet, Fast Ethernet, Gigabit Ethernet
Network / Transport ProtocolTCP/IP, UDP
Routing ProtocolBGP, OSPF, IS-IS, RIP, EIGRP, MPLS
Remote Management ProtocolSNMP, CLI, SSH
FeaturesMPLS, QoS, IPv6, NetFlow, ACLs, VRF
Power SupplyAC or DC
Operating Temperature0 to 40°C
Storage Temperature-40 to 70°C (-40 to 158°F)
Humidity5% to 95% (non-condensing)

Summary

Multiprotocol Label Switching (MPLS) on Cisco Routers

Finding Feature Information

Locates information about features, caveats, and release notes.

Information About MPLS

Provides an overview of MPLS functionality and its role in networks.

How to Configure MPLS

Explains basic configuration for MPLS switching and forwarding.

Additional References

Lists related documents for Cisco IOS commands and MPLS commands.

Feature Information for MPLS on Cisco Routers

Details software release information for MPLS features.

Glossary

Defines key terms and acronyms used in the document.

MPLS Transport Profile

Restrictions for MPLS-TP on the Cisco ASR 900 Series Routers

Lists limitations and unsupported features for MPLS-TP on specific routers.

Information About MPLS-TP

Explains how MPLS Transport Profile works, including LSPs and pseudowires.

How to Configure MPLS Transport Profile

Provides steps for configuring MPLS Transport Profile, including label ranges.

Configuration Examples for MPLS Transport Profile

Offers practical examples of MPLS Transport Profile configuration scenarios.

MPLS Multilink PPP Support

Prerequisites for MPLS Multilink PPP Support

Lists requirements for enabling MPLS Multilink PPP support.

Restrictions for MPLS Multilink PPP Support

Details limitations on multilink bundles and members per bundle.

Information About MPLS Multilink PPP Support

Describes Layer 3 VPN features and QoS features supported for Multilink PPP.

How to Configure MPLS Multilink PPP Support

Guides through configuring MPLS Multilink PPP support, including bundle creation.

Configuration Examples for MPLS Multilink PPP Support

Provides sample configurations for MPLS Multilink PPP in various network scenarios.

MPLS LSP Ping, Traceroute, and AToM VCCV

Prerequisites for MPLS LSP Ping, Traceroute, and AToM VCCV

Lists prerequisites before using MPLS LSP Ping, Traceroute, and AToM VCCV features.

Restrictions for MPLS LSP Ping, Traceroute, and AToM VCCV

Details limitations on using MPLS LSP Ping and Traceroute for specific applications like AToM and VPNs.

Information About MPLS LSP Ping, Traceroute, and AToM VCCV

Explains MPLS LSP Ping operation, echo request/reply paths, and packet handling.

Command Options for ping mpls and trace mpls

Describes command options and arguments for MPLS LSP Ping and Traceroute.

Selection of FECs for Validation

Explains how to select Forwarding Equivalence Classes (FECs) for LSP validation.

Reply Mode Options for MPLS LSP Ping and Traceroute

Controls how the responding device replies to MPLS echo requests.

Packet Handling Along Return Path with an IP MPLS Router Alert

Describes how IP and MPLS packets with router alert options are handled.

Other MPLS LSP Ping and Traceroute Command Options

Details additional command options for MPLS LSP Ping and Traceroute.

MPLS LSP Ping and Traceroute Returns a Q

Troubleshoots issues when MPLS echo replies return a 'Q' code, indicating packet transmission failure.

Load Balancing for IPv4 LDP LSPs

Explains how MPLS uses source/destination addresses for load balancing.

NSR LDP Support

Finding Feature Information

Locates information about features, caveats, and release notes for NSR LDP Support.

Prerequisites for NSR LDP Support

Lists requirements for NSR LDP Support to function correctly.

Information About NSR LDP Support

Details the roles of standby RP and LDP, and NSR operation states.

How to Configure NSR LDP Support

Provides steps to enable and configure NSR LDP Support.

Configuration Examples for NSR LDP Support

Shows sample configurations for NSR LDP Support, including verification steps.

Additional References for NSR LDP Support

Lists related documents and technical assistance resources for NSR LDP Support.

Feature Information for NSR LDP Support

Provides release-specific information for NSR LDP Support features.

VPLS Configuration over MPLS-TP

VPLS over MPLS-TP

Provides an overview of VPLS implementation over MPLS-TP.

Configuring VPLS over MPLS-TP

Guides through the configuration steps for VPLS over MPLS-TP.

Verifying the Configuration

Details commands for verifying VPLS configuration and debugging.

Configuration Examples

Offers practical examples for configuring VPLS over MPLS-TP.

Feature Information for VPLS Configuration over MPLS-TP

Lists software release information for VPLS over MPLS-TP features.

Circuit Emulation Service over UDP

Finding Feature Information

Locates information about features, caveats, and release notes for Circuit Emulation over UDP.

Restrictions for Circuit Emulation Service over UDP

Lists limitations and unsupported features for Circuit Emulation Service over UDP.

Information About Circuit Emulation Service over UDP

Explains CES overview, pseudowire emulation, and CESoPSN mode.

How to Configure Circuit Emulation Service over UDP

Guides through configuring Circuit Emulation Service over UDP.

Structure-Agnostic TDM over Packet over UDP

Details the Structure-Agnostic TDM over Packet (SAToP) encapsulation method.

How to Configure Structure-Agnostic TDM over Packet

Guides through configuring Structure-Agnostic TDM over Packet (SAToP).

Example Verifying the Configuration of Structure-Agnostic TDM over Packet

Demonstrates how to verify the SAToP configuration.

Flex LSP Overview

Signaling Methods and Object Association for Flex LSPs

Explains association signaling methods for bidirectional LSPs in Flex LSP.

Associated Bidirectional Non Co-routed and Co-routed LSPs

Overviews associated bidirectional LSPs, covering non co-routed and co-routed types.

Restrictions for Flex LSP

Lists limitations and recommendations for Flex LSP deployments.

How to Configure Co-routed Flex LSPs

Guides through configuring co-routed bidirectional Flex LSPs, including setup steps.

How to Configure Non Co-routed Inter-area Flex LSP Tunnels

Details configuration steps for non co-routed inter-area Flex LSP tunnels.

Flex LSP Phase 2

Covers features supported in Flex LSP Phase 2, like SRLG protection and ECMP.

Flex LSP SRLG and Exclude Option for Explicit Path

Explains how to configure SRLG and exclude options for Flex LSP explicit paths.

Flex LSP Non-Revertive 1:1 Path Protection

Guides on configuring non-revertive path protection for Flex LSP.

Flex LSP Sticky

Guides on configuring the sticky option for Flex LSP path protection.

Flex LSP Hop Count and Cost-Max Limit

Explains configuring hop count and accumulated path cost limits for Flex LSPs.

Flex LSP ECMP min-fill, max-fill, random

Details configuring ECMP tie-breakers like min-fill, max-fill, and random for Flex LSPs.

Restore Path Option

Explains how to configure and verify the restore path option for Flex LSP tunnels.

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