CANOGA PERKINS 9145E NID Software Version 4.10 - Manual (Page 282)

9145E NID Software User’s Manual Bandwidth Profiling
Shapers
270
ers can be enabled. For steps for configuring port-level policing, see the section
“Setting Port Filters” on page 144.
• a CE-VLAN ID - a policer can be assigned to one or multiple CE-VLAN ID. In that
scenario all PCP values are policed.
• A CE-VLAN/PCP – a policer can be assigned to one or multiple PCP values within
a set of CE-VLAN IDs. In that scenario, only the PCP values selected will be
policed; all other PCP values are not policed and are therefore dropped at the
UNI.
• an administrative state of the policer that allows you to enable and disable traffic policing,
without the need to re-provision the policer.
A policer classifies ingress frames as green, yellow or dropped (that is, frames it decides to drops
because they exceed the contract). Color marking of yellow frames can be done either by the
DEI bit set in the outer tag on the egress (NET) port or by remarking the PCP value CE-VLAN ID.
Color marking a global setting of the unit will apply to all policers configured in the NID. Refer to
“Configuring Bandwidth Profiles” on page 273 for more details on how to configure the color
marking.
13.3 Shapers
The shapers have been implemented as double-rate token bucket shapers. Figure 13-2
illustrates the queuing and transmission scheduling entities and parameters.
Figure 13-2 Shaping Entities
The double-rate shaping algorithm specifies six parameters:
• CIR: The shaping rate for packets declared Green.
• CBS: The output burst of Green packets.
• CBS*: The maximum burst of Green packets that the queue can accommodate (equiva-
lent to the size of the queue).