Performance Impact And Scalability Considerations; Performance Impact; Scalability Considerations - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - POLICY MANAGEMENT CONFIGURATION GUIDE 2010-10-04 Configuration Manual

JunosE 11.3.x Policy Management Configuration Guide
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Performance Impact and Scalability Considerations

Performance Impact

Scalability Considerations

166
Table 27: IPv6 Classification Fields for a 576-bit CAM Entry (continued)
Classifiers
Destination address (second word)
Destination Address (third word)
Destination Address (fourth word)
Protocol
Destination Port
Source Port
Color
The sum of all classification fields requested in ipv6Pol is 304, which is greater than
128-bit CAM entry size limit. Although this configuration fails to attach to the interface
in earlier releases, it is successfully attached to the interface, beginning with this
release, and the maximum 576-bit CAM entry is allocated for this policy (three 576-bit
entries, one for each classifier in the policy).
Performance Impact and Scalability Considerations on page 166
Size Limit for IP and IPv6 CAM Hardware Classifiers on page 155
CAM Hardware Classifiers Overview on page 154
The following sections describe how the memory usage and performance of the line
modules on which the variable-sized CAM entries are supported is affected, and also of
the maximum number of policies that can be supported with variable-sized CAM entries.
Some performance impact might occur due to the variable size of the CAM entries. This
performance impact is caused by CAM addressing, which works on 72 bits. 576-bit
classification requests now require up to 8 lookups to the CAM hardware (8 * 72 = 576).
The CAM device has a search rate of up to 83 million per second for 144 bit entries.
One CAM entry is required per classifier for each unique policy on each line module.
Regardless of the classifier definition for an IPv4 policy, each IPv4 classifier consumes
144 bits (one 144-bit CAM entry). However, default classifiers do not consume CAM
entries.
Size (Bits)
32
32
32
8
16
16
8
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