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VPLS and Default CoS Classification

A VPLS routing instance with the no-tunnel-services option configured has a default classifier applied to the label-switched interface for all VPLS packets coming from the remote VPLS PE. This default classifier is modifiable only on MX Series routers. On T Series, when no-tunnel-services option is configured, the custom classifier for VPLS instances is not supported.

Note: With no-tunnel-services configured, custom classifier for VPLS routing instances on T Series and LMNR based FPC for M320 is not supported. When a wild card configuration or an explicit routing instances are configured for VPLS on CoS CLI, the custom classifier binding results in default classifier binding on Packet Forwarding Engine (PFE).

For example, on routing devices with eight queues (Juniper Networks M120 and M320 Multiservice Edge Routers, MX Series 3D Universal Edge Routers, and T Series Core Routers), the default classification applied to no-tunnel-services VPLS packets are shown in Table 1.

Table 1: Default VPLS Classifiers

MPLS Label EXP Bits

Forwarding Class/Queue

000

0

001

1

010

2

011

3

100

4

101

5

110

6

111

7

Note: Forwarding class to queue number mapping is not always one-to-one. Forwarding classes and queues are only the same when default forwarding-class-to-queue mapping is in effect. For more information about configuring forwarding class and queues, see Configuring Forwarding Classes.

On MX Series routers, VPLS filters and policers act on a Layer 2 frame that includes the media access control (MAC) header (after any VLAN rewrite or other rules are applied), but does not include the cyclical redundancy check (CRC) field.

Note: On MX Series routers, if you apply a counter in a firewall for egress MPLS or VPLS packets with the EXP bits set to 0, the counter will not tally these packets.

Published: 2013-08-28

Published: 2013-08-28