Supported Platforms
Applying MPLS EXP Classifiers for Explicit-Null Labels
When you configure MPLS explicit-null labels, label 0 is advertised to the egress router of an LSP. When label 0 is advertised, the egress router (instead of the penultimate router) removes the label. Ultimate-hop popping ensures that any packets traversing an MPLS network include a label. For more information about explicit-null labels and ultimate-hop popping, see the Junos OS MPLS Applications Configuration Guide.
On M320 and T Series routers, when you configure MPLS explicit-null labels with an MPLS EXP classifier, the MPLS EXP classifier can be different from an IPv4 or IPv6 classifier configured on the same logical interface. In other words, you can apply separate classifiers for MPLS EXP, IPv4, and IPv6 packets per logical interface. To combine an EXP classifier with a distinct IPv6 classifier, the PIC must be mounted on an Enhanced FPC.
 | Note: For J Series routers and other M Series routers, MPLS explicit-null labels with MPLS EXP classification are supported if you set the same classifier for EXP and IPv4 traffic, or EXP and IPv6 traffic. For more information about how IPv4 and IPv6 packet classification is handled, see Applying DSCP IPv6 Classifiers. |
To configure an MPLS EXP classifiers for explicit-null labels, include the exp statement at the [edit class-of-service classifiers] and [edit class-of-service interfaces interface-name unit logical-unit-number classifiers] hierarchy levels:
