Juniper JUNOSE 11.2.X BGP AND MPLS, Configuration Manual

Page: 345 / 742

Table 57: Examples of Incoming L-LSP PHB Determination (continued)
PHB = EXP Field + PSC
AF33 011 AF3
• For outgoing L-LSPs, the EXP is determined by the PHB. Table 58 on page 309 indicates
the PHB-to-EXP mapping for outgoing traffic on L-LSPs.
Table 58: Outgoing L-LSP PHB Determination
EXP Field = PHB
000 BE
000 CSn
001 AFn1
010 AFn2
011 AFn3
000 EF
For nonstandard PHBs, the mapping is similar to AFn mapping. Red color maps to 011,
yellow maps to 010, and green maps to 001.
Tasks to perform static configuration and signaled mapping between the EXP bits and
the PHB of traffic include the following sets of tasks:
• Configuring Static EXP-to-PHB Mapping on page 309
•
Signaled Mapping for RSVP-TE Tunnels on page 310
•
Preference of per-VR Versus per-LSP Behavior on page 312
Configuring Static EXP-to-PHB Mapping
You can configure static EXP-to-PHB mapping at the per-VR level, only for LSPs that do
not have specific policies attached (by either per-LSP configured mapping or signaled
mapping). The configured mapping applies regardless of label distribution protocol, BGP.
LDP, or RSVP-TE.
The PHB of incoming packets is determined from the EXP bits by the match values set
with the
mpls match exp-bits command.
The EXP bits of outgoing packets are determined from the PHB by the mtach values set
with the mpls match traffic-class command.
To configure static EXP-to-PHB mapping:
309 Copyright © 2010, Juniper Networks, Inc.
Chapter 4: Configuring MPLS