Restrictions For Path Protection - Cisco ASR 9000 Series Configuration Manual
Aggregation services router mpls
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Also See for ASR 9000 Series:
- Command reference manual (1138 pages) ,
- Routing configuration manual (702 pages) ,
- Reference manual (696 pages)
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Path Protection
• Ensure that your network supports MPLS-TE, Cisco Express Forwarding, and Intermediate
System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF).
• Enable MPLS.
• Configure TE on the routers.
• Configure a TE tunnel with a dynamic path option by using the path-option command with the
dynamic keyword.
Related Topics
Enabling Path Protection for an Interface, on page 202
Assigning a Dynamic Path Option to a Tunnel, on page 203
Forcing a Manual Switchover on a Path-Protected Tunnel, on page 204
Configuring the Delay the Tunnel Takes Before Reoptimization, on page 205
Configure Tunnels for Path Protection: Example, on page 258
Restrictions for Path Protection
• Only Point-to-Point (P2P) tunnels are supported.
• Point-to-Multipoint (P2MP) TE tunnels are not supported.
• A maximum of one standby LSP is supported.
• There can be only one secondary path for each dynamic path option.
• Explicit path option can be configured for the path protected TE with the secondary path option as
dynamic.
• Do not use link and node protection with path protection on the headend router.
• A maximum number of path protected tunnel TE heads is 2000.
• A maximum number of TE tunnel heads is equal to 4000.
• When path protection is enabled for a tunnel, and the primary label switched path (LSP) is not assigned
a backup tunnel, but the standby LSP is assigned fast-reroute (FRR), the MPLS TE FRR protected value
displayed is different from the Cisco express forwarding (CEF) fast-reroute value.
• Inter-area is not supported for path protection.
Related Topics
Enabling Path Protection for an Interface, on page 202
Assigning a Dynamic Path Option to a Tunnel, on page 203
Forcing a Manual Switchover on a Path-Protected Tunnel, on page 204
Configuring the Delay the Tunnel Takes Before Reoptimization, on page 205
Configure Tunnels for Path Protection: Example, on page 258
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
136
Implementing MPLS Traffic Engineering
OL-28381-02
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