mpls load-balance wtr

Function

The mpls load-balance wtr command is used to configure the delay time for MPLS equal-cost multiple path (ECMP) switchback.

The undo mpls load-balance wtr command is used to restore the default configuration.

By default, packet loss occurs during MPLS ECMP switchback.

Format

mpls load-balance wtr wtr-value

undo mpls load-balance wtr [ wtr-value ]

Parameters

Parameter	Description	Value
wtr-value	Sets a WTR time for MPLS ECMP.	The value is an integer ranging from 5 to 60, in seconds. When the undo mpls load-balance wtr command is run, the default delay time for MPLS ECMP switchback is 0 seconds.

Parameter

Description

Value

wtr-value

Sets a WTR time for MPLS ECMP.

The value is an integer ranging from 5 to 60, in seconds. When the undo mpls load-balance wtr command is run, the default delay time for MPLS ECMP switchback is 0 seconds.

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
forwarding	write

Usage Guidelines

Usage Scenario

In an L3VPN over BGP over TE or IP over BGP over TE scenario, to prevent packet loss between boards in ECMP, run the mpls load-balance wtr command to set a WTR time for MPLS ECMP.

Precautions

The mpls load-balance wtr command is used in the following scenarios:

L3VPN/ L2VPN traffic is recursively transmitted over load-balancing LDP/SR-MPLS BE tunnels. The delayed switchback needs to be configured for these load-balancing LDP/SR-MPLS BE tunnels.
L3VPN/ L2VPN traffic is recursively transmitted over load-balancing TE/SR-MPLS TE tunnels. The delayed switchback needs to be configured for these load-balancing TE/SR-MPLS TE tunnels.
L3VPN/ L2VPN traffic is recursively transmitted over an LDP/SR-MPLS BE tunnel. The LDP/SR-MPLS BE tunnel recurses to load-balancing TE/SR-MPLS TE tunnels. The delayed switchback needs to be configured for these load-balancing TE/SR-MPLS TE tunnels.
The delayed switchback needs to be configured for load-balancing LSPs within an LDP/SR-MPLS BE tunnel on a transit node.
A transit node on an LDP/SR-MPLS BE tunnel recursively transmits traffic over a TE tunnel. The delayed switchback needs to be configured for load-balancing LSPs within the TE tunnel.
A transit node on a BGP tunnel recursively transmits traffic over load-balancing LDP/SR-MPLS BE tunnels. The delayed switchback needs to be configured for these load-balancing LDP/SR-MPLS BE tunnels.
A transit node on a BGP tunnel recursively transmits traffic over an LDP/SR-MPLS BE tunnel, and the LDP/SR-MPLS BE tunnel recurses to load-balancing TE/SR-MPLS TE tunnels. The delayed switchback needs to be configured for these load-balancing TE/SR-MPLS TE tunnels.
A transit node on a BGP tunnel recursively transmits traffic over a TE/SR-MPLS TE tunnel. The delayed switchback needs to be configured for load-balancing LSPs within the TE/SR-MPLS TE tunnel.
The delayed switchback needs to be configured for load-balancing LSPs within an SR-MPLS TE tunnel on a node through which the SR-MPLS TE tunnel passes.
The delayed switchback needs to be configured for load-balancing LSPs within an SR-MPLS TE tunnel on a stitching node.
The delayed switchback needs to be configured for BGP-EPE SR-MPLS TE ECMP.

Example

# In the system view, configure the delay time for MPLS ECMP switchback as 20s.

<HUAWEI> system-view
[~HUAWEI] mpls load-balance wtr 20