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Supported Platforms for Tricolor Marking

In the JUNOS software implementation, you can configure four loss priorities (sometimes called four-color marking) instead of three. The software marks loss priorities as high, medium-high, medium-low, and low. This allows you to provision even more granular service-level agreements (SLAs) across the DiffServ domain. TCM can be configured as single-rate tricolor marking (TCM) or two-rate TCM.

TCM is supported on the following routing platforms:

T-series and M320 platforms with Enhanced II Flexible PIC Concentrators (FPCs)
T640 routing platforms with Enhanced Scaling FPC4
M120
MX-series (two-rateTCM only)

The platforms that support TCM interoperate with other platforms, as shown in Table 41.

Table 41: TCM Platform Interoperation

Packets Sent	Packets Received
From Other Platforms	By Platforms Supporting TCM
low	low
high	medium-high
From Platforms Supporting TCM	By Other Platforms
low	low
medium-low	low
medium-high	high
high	high

You can monitor how packets are marked by issuing the show class-of-service forwarding-table classifier command:

user@host> show class-of-service forwarding-table
classifier

Classifier table index: 33166, # entries: 8, Table type: IEEE 802.1
Entry #   Code point   Queue #    PLP
   0           000        1       2  <---- medium-low
   1           001        2       2
   2           010        2       1  <---- high
   3           011        1       1
   4           100        2       3  <---- medium-high
   5           101        1       3
   6           110        1       0  <---- low
   7           111        2       0

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