Table 4: Traffic Parameters Used To Compute Bandwidth - Juniper JUNOSE SOFTWARE 11.0.X - LINK LAYER CONFIGURATION GUIDE 4-1-2010 Configuration Manual

JUNOSe 11.0.x Link Layer Configuration Guide
Table 4 on page 8 lists the traffic parameter that the router uses for each service
category to compute the bandwidth that the connection requires. For example, the
peak cell rate is used to calculate how much bandwidth is required for CBR
connections.

Table 4: Traffic Parameters Used to Compute Bandwidth

How CAC Works
With no connections, the available bandwidth is equal to the subscription port
bandwidth. While connections are requested, the required bandwidth, which is based
on the service category and traffic parameters of the connection, is compared against
the available port bandwidth. If sufficient bandwidth is available, the router accepts
the connection and updates the available port bandwidth accordingly.
Similarly, when a connection is deleted, the available port bandwidth is updated
accordingly.
Configuring CAC
You enable and configure CAC on an ATM major interface using "atm cac" on page 28
. When you enable CAC on an ATM interface, you can optionally specify a subscription
bandwidth and a UBR weight:
CAC and ATM Bulk Configuration
You cannot configure CAC on an ATM interface on which you have created a
bulk-configured virtual circuit (VC) range for use by a dynamic ATM 1483 subinterface.
Conversely, you cannot create a bulk-configured VC range on an ATM interface on
which you have configured CAC. The router rejects these configurations, which causes
them to fail.
8
Overview
Service Category Traffic Parameter Used to Calculate Required Bandwidth
CBR PCR
VBR-RT SCR
VBR-NRT SCR
UBR UBR bandwidth configured on the ATM major interface
UBR with PCR UBR bandwidth configured on the ATM major interface
The subscription bandwidth can be greater than the effective port bandwidth to
allow oversubscription. The default value of the subscription bandwidth is the
effective bandwidth of the ATM port.
The UBR weight enables you to limit the number of UBR connections by assigning
a bandwidth or weight to each UBR or VBR with a PCR connection