Appendix A Engineering Rules

Appendix A
Engineering Rules
 
 
This section provides engineering rules or guidelines to consider prior to configuring the system for your network deployment.
Important:
CLI Rules
Multiple CLI session support is based on the amount of available memory. The Resource Manager reserves enough resources so that at a minimum, support for six CLI sessions is assured at all times. One of the six sessions is further reserved for use exclusively by a CLI session on an SPIO serial interface.
Additional CLI sessions beyond the pre-reserved limit are permitted if sufficient SMC resources are available. If the Resource Manager is unable to reserve resources for a CLI session beyond those that are pre-reserved, users with administrator-privileges are prompted to create the new CLI session, even without reserved resources.
Interface and Port Rules
The rules discussed in this section pertain to the following Ethernet line cards and the type of interfaces they facilitate, regardless of the application:
 
 
Line Card Rules
The following engineering rules apply to the Fast Ethernet 10/100, Gigabit Ethernet 1000, and Quad Gigabit line cards:
 
 
Important: If you have enabled the Port Redundancy feature, it is possible for ports on both line cards to be active while one provides line card redundancy for the other. With the port redundancy feature, each physical port has a primary MAC address. Each corresponding standby port has a different (alternate) MAC address.
Packet Data Network (PDN) Interface Rules
The following engineering rules apply to the interface to the packet data network (PDN):
 
 
Packet Processing Card Rules
The following engineering rules apply to the PSC, and PSC2 processing application cards:
 
 
Context Rules
 
Important: Each address in the pool requires approximately 60 bytes of memory. The amount of memory required, however, depends on a number of factors such as the pool type, and hold-timer usage. Therefore, in order to conserve available memory, you may need to limit the number of pools depending on the number of addresses to be configured and the number of installed application cards.
Subscriber Rules
The following engineering rules apply to subscribers configured within the system:
 
 
Important: Default is not used when local authentication (for local subscribers) is performed.
Service Rules
The following engineering rules apply to services configured within the system:
 
 
Caution: Large numbers of services greatly increase the complexity of management and may affect overall system performance. Therefore, it is recommended that you do not configure a large number of services unless your application absolutely requires it. Please contact your local service representative for more information.
Access Control List (ACL) Engineering Rules
The following rules apply to Access Control Lists:
 
 
 

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