cos (MPLS)

Configures the a Class of Service (CoS) priority value for all packets traveling through the LSP.

Syntax

cos number

no cos number

Parameters

number: Specifies the CoS priority value. Enter a number from 0 to 7. The lowest priority is 0, the default value. The highest priority is 7.

Modes

MPLS LSP configuration mode.

MPLS router bypass LSP configuration mode (config-router-mpls-bypass-lsp-bypass_name).

MPLS router MPLS interface dynamic bypass configuration mode (config-router-mpls-if-ethernet-slot/port-dynamic-bypass)

Usage Guidelines

The 3-bit EXP field in the MPLS header defines a CoS value for packets traveling through the LSP. When you set the CoS value, it is applied to the EXP field in the MPLS header of all packets entering this LSP. Then, all packets traveling through an LSP have the same priority as they travel the MPLS domain.

The MPLS CoS value determines the priority within an MPLS domain only. When the label is pops, the CoS value in the MPLS header is discarded and it is not copied back to the IP ToS field.

Use the no form of the command to remove the configured setting.

MPLS is supported on the Extreme 8820, SLX 9740, SLX 9640, and SLX 9540 devices only.