Black Box LR11xx Series Router Configurations Guide
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
SrcOne | SrcTwo | SrcDef |
Src IP = 10.1.1.1/32 | Src IP = 10.1.1.0/24 | Src IP = default |
Src IP = 10.1.1.2/32 | CR = 1024 Kbps | CR = 512 Kbps |
CR = 1536 Kbps | BR = 3072 Kbps | BR= 1024 Kbps |
BR = 3072 Kbps |
|
|
AppHTML | AppSMTP | AppDef |
Port = 80 | Port = 25 | Port = default |
CR = 512 Kbps | CR = 384 Kbps | CR = 128 Kbps |
BR = 3072 Kbps | BR = 3072 Kbps | BR = 3072 Kbps |
Traffic Classes
Traffic Classes
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