Black Box LR1102A-T1/E1 - Manual (Page 118)

Black Box LR11xx Series Router Configurations Guide
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22.1.2Definitions
„ Committed Rate
Each traffic class can be assigned a CR parameter in Kbps. This is the amount of bandwidth that the class or
flow is guaranteed at all times, even during congestion. The sum of the CRs for all classes in a given direction
cannot exceed the access bandwidth of their parent class. By maintaining a moving average of the bandwidth
for each class, the class is not “strictly” policed at CR Kbps, and momentary bursts in the flow are permitted.
The goal is that each class with sufficient demand will be able to receive roughly its allocated bandwidth over
some interval of time.
„ Burst Rate
Every traffic class can be configured with a burst parameter, which is the bandwidth that can be offered to that
class if unused bandwidth is available from other classes. This provides for very efficient bandwidth utilization.
A class can also be configured to borrow whatever bandwidth is available from its parent class up to the BR
limit set for that class. To prevent a class from borrowing, set the CR equal to the BR. Also, note that a class
cannot borrow more than the bundle bandwidth.
22.1.3Classification Types
The example in Figure 1 reserves the largest CR (1536 Kbps) for two servers, 10.1.1.1 and 10.1.1.2, which are members
of the SrcOne class. The remainder of the 10.1.1.0/24 subnet is assigned to the SrcTwo class and is configured with a CR
of 1024 Kbps. Additionally, the SrcTwo class is further divided into application port classes. All other hosts in Figure 1,
the default class, are configured for a CR of 512 Kbps.
The classification type must be the same across a given level of traffic class. Note in Figure 1, that the classification type
at the first level traffic class is the source IP address; for the second level, the classification type is the application port.
Because bandwidth limitations are evaluated from most specific to least specific, 10.1.1.1/32 falls within the SrcOne
class.
Figure 38 Assigning Classification Types
Interface Bundle AppTest
2 x T1
Bandwidth = 3072 Kbps
Src IP = 10.1.1.1/32
Src IP = 10.1.1.2/32
CR = 1536 Kbps
BR = 3072 Kbps Src IP = 10.1.1.0/24
CR = 1024 Kbps
BR = 3072 Kbps Src IP = default
CR = 512 Kbps
BR= 1024 Kbps
Port = 80
CR = 512 Kbps
BR = 3072 Kbps Port = 25
CR = 384 Kbps
BR = 3072 Kbps Port = default
CR = 128 Kbps
BR = 3072 Kbps
SrcTwo SrcOne SrcDef
AppSMTP AppHTML AppDef
Traffic Classes
Traffic Classes