Cisco Cisco Content Switching Module Notas de publicación
12
Release Notes for Catalyst 6500 Series Content Switching Module Software Release 3.1(10)
OL-7155-01
New and Changed Information
New and Changed Information
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When you configure the least connection predictor, a slow-start mechanism operates to avoid
sending a high rate of new connections to the servers that have just been put in service. The least
connections predictor ensures that the server with the fewest number of active connections will
receive the next connection request.
sending a high rate of new connections to the servers that have just been put in service. The least
connections predictor ensures that the server with the fewest number of active connections will
receive the next connection request.
A new environment variable, REAL_SLOW_START_ENABLE, is included in the 3.1(9) software
release to control the rate at which a real server becomes operational when it is put into service. This
new variable is only available for a server farm that has been configured with the least connection
predictor.
release to control the rate at which a real server becomes operational when it is put into service. This
new variable is only available for a server farm that has been configured with the least connection
predictor.
The configurable range for this variable is 0 to 10. The setting of 0 disables the slow start feature.
The value from 1 to 10 specifies how fast the newly activated server should become operational. The
value of 1 is the slowest rate. The value of 10 specifies that the CSM would assign more requests to
the newly activated server. The value of 3 is the default value.
The value from 1 to 10 specifies how fast the newly activated server should become operational. The
value of 1 is the slowest rate. The value of 10 specifies that the CSM would assign more requests to
the newly activated server. The value of 3 is the default value.
If the configuration value is N, the CSM assigns 2 ^ N (2 raised to the N power) new requests to the
newly active server at startup (assuming no connections were terminated at that time). As this server
finishes or terminates connections; more connections are assigned. Normal connection assignments
resume when the newly activated server has the same number of open connections as the other
servers in a serverfarm.
newly active server at startup (assuming no connections were terminated at that time). As this server
finishes or terminates connections; more connections are assigned. Normal connection assignments
resume when the newly activated server has the same number of open connections as the other
servers in a serverfarm.
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CSM release 3.1(4) and later releases are supported with the Supervisor Engine 720 only with
Cisco IOS software Release 12.2(14)SX1 software or higher.
Cisco IOS software Release 12.2(14)SX1 software or higher.
•
The CSM is supported on the Supervisor Engine 720 with the Catalyst operating system software as
of CSM software release 3.14.
of CSM software release 3.14.
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CSM software release 3.1(4) and later releases are supported in a switch running both Cisco IOS
software Release 12.1(13)E and higher and the Catalyst operating system software 7.5 or higher for
Supervisor Engine 2 and Cisco IOS software release 12.2(14)SX1 or a later release and CSM
software release 3.1(4) or greater.
software Release 12.1(13)E and higher and the Catalyst operating system software 7.5 or higher for
Supervisor Engine 2 and Cisco IOS software release 12.2(14)SX1 or a later release and CSM
software release 3.1(4) or greater.
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There is an enhancement to the predictor IP hash and cookie hash. The CSM will perform a
secondary hash if the first hash value resolves in mapping to an out-of-service real server. This
enhancement allows even distribution of connections. Previously, when a real server became
out-of-service, all of its intended connections would go to the next real server in sequence.
secondary hash if the first hash value resolves in mapping to an out-of-service real server. This
enhancement allows even distribution of connections. Previously, when a real server became
out-of-service, all of its intended connections would go to the next real server in sequence.
•
For your convenience, sample scripts are available to support the TCL (Toolkit Command
Language) feature. Other custom scripts will work, but these sample scripts are supported by Cisco
TAC. The file with sample scripts is located at this URL:
Language) feature. Other custom scripts will work, but these sample scripts are supported by Cisco
TAC. The file with sample scripts is located at this URL:
http://www.cisco.com/cgi-bin/tablebuild.pl/cat6000-intellother
The following file contains the sample scripts: c6slb-script.3-1-6.tcl.
Limitations and Restrictions
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The CSM does not support pipelines (multiple HTTP requests sharing the packet boundary) with the
persistent rebalance feature.
persistent rebalance feature.
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Internal ports on the CSM (dot1q, trunk, port-channel, etc.) are automatically configured, with the
exception of the VLANs on the trunk, which must be manually added using the set trunk slot 1
vlan-list command in Catalyst operating system.
exception of the VLANs on the trunk, which must be manually added using the set trunk slot 1
vlan-list command in Catalyst operating system.