mpls te backup hotstandby-lsp-constraint

Function

The mpls te backup hotstandby-lsp-constraint command sets the WTR time for a switchback, locks an attribute template, and enables the dynamic bandwidth function for a hot-standby CR-LSP.

The undo mpls te backup hotstandby-lsp-constraint command restores default settings.

By default, the interval between switchbacks is 10 seconds; no attribute template is locked; the dynamic bandwidth function is disabled for a hot-standby CR-LSP.

Format

mpls te backup hotstandby-lsp-constraint { wtr interval | lock | dynamic-bandwidth | overlap-path }

mpls te backup hotstandby-lsp-constraint mode { revertive [ wtr interval ] | non-revertive }

undo mpls te backup hotstandby-lsp-constraint { wtr | lock | dynamic-bandwidth | overlap-path }

undo mpls te backup hotstandby-lsp-constraint mode { non-revertive | revertive wtr }

Parameters

Parameter	Description	Value
dynamic-bandwidth	Enables the dynamic bandwidth function for a hot-standby CR-LSP.	-
lock	Enables the function of locking a hot-standby CR-LSP attribute template.	-
wtr interval	Specifies the WTR time for a switchback from a hot-standby CR-LSP.	The value is an integer that ranges from 0 to 2592000, in seconds. The default value is 10 seconds.
overlap-path	Indicates that if no other path is available, the hot-standby LSP can overlap the primary LSP.	-
mode { revertive \| non-revertive }	Specifies the revertive mode. revertive: The current mode can be switched to the original mode. non-revertive: The current mode cannot be switched to the original mode.	The default mode is revertive.

Views

Tunnel interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

The function of locking a hot-standby CR-LSP attribute template allows the system to lock a lower-priority attribute template that has been used by an exiting hot-standby CR-LSP. The system will not attempt to use a higher-priority template to set up a new hot-standby CR-LSP.

Prerequisites

The following configurations must be completed before the mpls te backup hotstandby-lsp-constraint command is run:

Run the mpls te primary-lsp-constraint command to use attribute templates to set up a primary CR-LSP.
Run the mpls te hotstandby-lsp-constraint command to use attribute template to set up a hot-standby CR-LSP.

Precautions

This command is valid only for the hot-standby CR-LSP that is set up using a CR-LSP attribute template. If a hot-standby CR-LSP is set up without a CR-LSP attribute template, the following commands apply:

The mpls te backup hot-standby wtr interval command is used to set the WTR time for a switchback.
The mpls te backup hot-standby dynamic-bandwidth command is used to enable the dynamic bandwidth function for the hot-standby CR-LSP.
The mpls te backup hot-standby overlap-path command is used to enable the path overlapping function for hot-standby CR-LSPs that are not established using attribute templates.

The dynamic bandwidth function for the hot-standby CR-LSP prevents a hot-standby CR-LSP transmitting no traffic from using bandwidth resources. If the primary CR-LSP fails, the system attempts to re-establish a new hot-standby CR-LSP with the required bandwidth determined by the Make-Before-Break mechanism. After the new hot-standby CR-LSP takes over traffic, the bandwidth of the failed hot-standby CR-LSP becomes 0 bit/s and is deleted by the system.

Example

# Set the WTR time for a switchback from the hot-standby CR-LSP to 20 seconds.

<HUAWEI> system-view
[HUAWEI] interface tunnel 1
[HUAWEI-Tunnel1] mpls te primary-lsp-constraint lsp-attribute t1
[HUAWEI-Tunnel1] mpls te hotstandby-lsp-constraint 1 lsp-attribute t2
[HUAWEI-Tunnel1] mpls te backup hotstandby-lsp-constraint wtr 20
[HUAWEI-Tunnel1] mpls te commit