Threshold Group For Tbr Classes - Cisco Catalyst 8540 MSR Configuration Manual

Atm switch router software configuration guide

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Configuring Tag Switching and MPLS

Threshold Group for TBR Classes

A threshold group utilizes the memory efficiently among VCs of a particular traffic type. Each threshold

group is programmed with a dynamic memory allocation profile that maps into the needs of the

connections of a particular service class. There are 16 threshold groups (0 to 15) available on the ATM

switch router. Each threshold group has a set of eight regions, and each region has a set of thresholds.

When these thresholds are exceeded, cells are dropped to maintain the integrity of the shared memory

Each ATM Forum service category is mapped into a distinct threshold group. All the connections in a

particular service category map into one threshold group. Similarly, all the Tag Bit Rate (TBR) classes

have best effort traffic and the service differentiation comes mainly by giving different weights. Each of

the TBR classes map into four different threshold groups whose parameters are the same as the

unspecified bit rate (UBR) threshold group.

for the Catalyst 8540 MSR.

Table 16-5 Threshold Group Parameters for TVCs (Catalyst 8540 MSR)

for the Catalyst 8510 MSR and LightStream 1010 ATM switch routers.

Table 16-6 Threshold Group Parameters for TVCs (Catalyst 8510 MSR and LightStream 1010)

Each threshold group is divided into eight regions. Each region has a set of thresholds that are calculated

from the corresponding threshold group parameters given in

in any one of the regions depending on the fill level (cell occupancy) of that group. And that region is

used to derive the set of thresholds which apply to all the connections in that group.

shows the threshold group parameters mapped to the connections in all of the TBR classes

shows the threshold group parameters mapped to the connections in all of the TBR classes

Threshold Group for TBR Classes

16-5. The threshold group might be

ATM Switch Router Software Configuration Guide

Catalyst 8510 msr Lightstream 1010