Extreme Networks ExtremeWare 7.3.0, Command Reference Manual

Page: 1786 / 2254

1786 ExtremeWare Software 7.3.0 Command Reference Guide
MPLS Commands
Exp-to-dot1p Mappings
The exp-to-dot1p mappings are used when the switch performs label swapping as an intermediate LSR
and when the switch is the egress LSR. In both of these cases, the MPLS module receives an
MPLS-encapsulated frame.
The EXP field in the frame is used as an
<input_value>
to the exp-to-dot1p table. The corresponding
<output_value>
is an 802.1p priority value. The 802.1p priority value is inserted into the frame before
the frame is forwarded by the MPLS module.
The exp-to-dot1p table is completely flexible, such that any EXP
<input_value>
can be mapped to any
802.1p priority
<output_value>
.
The exp-to-dot1p table is also used by Packet over SONET (PoS) ports when classifying
MPLS-encapsulated packets received from the SONET link. When a PoS port receives an
MPLS-encapsulated packet from the SONET link, the packet is classified based on the EXP value in the
MPLS shim header. The EXP value from the received frame is used as an index into the exp-to-dot1p
mapping table to retrieve and 802.1p priority value. The frame is then assigned to a QoS profile, based
on the retrieved 802.1p priority value. The mappings between 802.1p priority values and QoS profiles
are configured using the following command:
configure dotip type
Example
The following command configures the dot1p-to-exp MPLS-specific QoS mappings:
configure mpls qos-mapping dot1p-to-exp 0/1
History
This command was first available in an ExtremeWare IP Technology Services Release based on
v6.1.8b12.
This command was subsequently incorporated into ExtremeWare 7.0.0.
Platform Availability
This command is available on the BlackDiamond switch only.