Extreme Networks ExtremeWare 7.7, Command Reference Manual

Page: 2530 / 2620

2530 ExtremeWare 7.7 Command Reference Guide
MPLS Commands—BlackDiamond Switch Only
configure mpls qos-mapping
configure mpls qos-mapping [dot1p-to-exp | exp-to-dot1p] [all |
<input_value>]/<output_value>
Description
Configures MPLS-specific QoS mappings.
Syntax Description
Default
Mapping tables are initialized such than an
<input_value>
of n is mapped to an
<output_value>
of n .
Usage Guidelines
The valid range of integers for the
<input_value>
and the
<output_value>
is 0 to 7. Two mappings are
supported:
• dot1p-to-exp
• exp-to-dot1p
Dot1p-to-exp Mappings
The dot1p-to-exp mappings are used by the ingress LSR. When a non-MPLS ingress frame arrives at the
MPLS module, the frame always contains an IEEE 802.1p priority field.
The value of the priority field is set based on the QoS classification performed by the ingress I/O
module. The ingress I/O modules assign each packet to a hardware queue, based on the configured
ExtremeWare QoS policies. There is a one-to-one mapping between the hardware queue and the 802.1p
priority values that are inserted into frames forwarded to the MPLS module. For example, the 802.1p
priority value is set to 0 for frames forwarded from hardware queue 0, set to 1 for frames forwarded
from hardware queue 1, and so on.
The dot1p-to-exp table maps 802.1 priority values to MPLS EXP values. The table is completely flexible,
such that any 802.1p priority
<input_value>
can be mapped to any EXP
<output_value>
. The EXP
output_value is set in the MPLS header of the packet as it is forwarded to the MPLS network.
dot1p-to-exp Specifies that mappings are used in performing the ingress LSR function. The value in this
priority field is set based on the QoS classification performed by the ingress I/O module.
exp-to-dot1p Specifies that mappings are used when performing label swapping as an intermediate LSR and
when performing the egress LSR function.
all Specifies to map all input values to the specified output value.
input_value Specifies an input value.
output_value Specifies an output value.