Configuring Vc Cos Mode; Enabling The Plp Setting To Be Copied To The Clp Bit - Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual

JUNOS 10.1 Network Interfaces Configuration Guide
To see the results of this configuration, you can issue the following operational mode
Verifying the
commands:
Configuration

Configuring VC CoS Mode

VC CoS mode defines the CoS queue scheduling priority. By default, the VC CoS mode
is alternate. When it is a queue s turn to transmit, the queue transmits up to its weight
in cells as specified by the
at-fpc/pic/port atm-options scheduler-maps map-name forwarding-class class-name]
hierarchy level. The number of cells transmitted can be slightly over the configured
or default transmit weight, because the transmission always ends at a packet
boundary.
To configure the VC CoS mode, include the
interfaces at-fpc/pic/port atm-options scheduler-maps]
Two modes of CoS scheduling priority are supported:

Enabling the PLP Setting to Be Copied to the CLP Bit

For a PE router with customer edge (CE)-facing, egress, ATM2 IQ interfaces configured
with standard AAL5 encapsulation, you can enable the PLP setting to be copied into
the CLP bit.
NOTE: This configuration setting is not applicable to Layer 2 circuit encapsulations
because the control word captures and preserves CLP information. For more
information about Layer 2 circuit encapsulations, see "Configuring Layer 2 Circuit
Transport Mode" on page 308.
By default, at egress ATM2 IQ interfaces configured with standard AAL5 encapsulation,
the PLP information is not copied to the CLP bit. This means the PLP information is
not carried beyond the egress interface onto the CE router.
356
Configuring ATM2 IQ VC Tunnel CoS Components
show interfaces at-0/1/0 extensive
show interfaces queue at-0/1/0
show class-of-service forwarding-class
transmit-weight
edit interfaces at-fpc/pic/port atm-options scheduler-maps]
vc-cos-mode (alternate | strict);
alternate —Assign high priority to one queue. The scheduling of the queues
alternates between the
other scheduled packet is from the
—Assign strictly
strict high
is always scheduled before the remaining queues. The remaining queues are
scheduled in round-robin fashion.
statement at the
vc-cos-mode
priority queue and the remaining queues. Every
high
high priority queue.
priority to one queue. A queue with strictly
[edit interfaces
statement at the [edit
hierarchy level:
priority
high