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DES-7200 Configuration Guide Chapter 3 MPLS QOS
Configuration
3-25
3.5.2 Network topology
Fig 4 MPLS VPN
Topology description: In Fig 4, the leftward part of PE-1 and the rightward
part of PE-2 are both IP network. Packets are transmitted from site A to site
B.
Description of target: Assuming that the user has divided packets into 4
classes on CE-1: 1) voice packets, with DSCP marked as 48; 2) SAP
packets, with DSCP marked as 16; 3) FTP packets, with DSCP marked as
8; 4) other packets, with DSCP marked as 0.
The user intends to reserve 10%, 30%, 20% and 40% bandwidth respectively
for the 1st, 2nd, 3rd and 4th class of packets on PE-1. For the 1st class of
packets, the user intends to impose EXP value of 6 upon MPLS label, and 3, 1
and 0 respectively for the 2nd, 3rd and 4th class of packets.
On P device, all traffic will be classified according to MPLS EXP value, and the
bandwidth as per the ratio of 1:4:3:1:3:1:1:6 will be allocated according to the
priority of traffic (from high to low). The service with the lowest priority will be
subject to rate limit (not exceeding 1000Mbits/s).
On PE-2, the user expects to rate limit the outgoing traffic. The output data rate
of all packets with DSCP value being 0 must not exceed 400Mbits/s.
We will introduce how to configure MPSL QoS on PE-1, P and PE-2 according
to user's intents.
3.5.3 Short pipe model
Short pipe model requires configuring QoS policy on PE-2 according to the
Tunneling DiffServ information. Here we will introduce how to configure short
pipe model.
3.5.3.1 Configuration tips
PE-2 communicates with CE-2 through Router Port. They cannot
communicate through SVI (because on the current switch products, QoS
policy cannot be associated to SVI interface).