Nortel SMC 2450, Implementation Manual

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Page 216 of 260 Limits and Scaling
553-3001-225 Standard 1.00 May 2006
proxy a full variety of rate limiting settings are available under the /maint/
unistim/adv/flow menu. The UNIStim proxy is not designed to accommodate
tens of Mbps of UNIStim control traffic.
Although not supported, the secure UNIStim proxy is tested at steady state
capacities of over 12000 simultaneous secure UNIStim clients. If the ramp up
rates are within specifications, the SMC can accommodate the steady state
requirements of 10000+ secure UNIStim users. Around 3000 of the secure
UNIStim client connections were performed with MCS and CS1000 tools
which simulate real-life steady state signaling environments. The remainder
of the connections were loaded using a different tool that cannot accurately
simulate real-life steady state signaling conditions. The testing was
performed with loads as high as 12500 simultaneous secure UNIStim
connections and the CPU remained far within acceptable limitations when
steady state was achieved. Conservatively, the SMC can handle 10000
concurrent secure UNIStim connections in a real-life environment (that is, the
SMC is not a limiting factor at steady state traffic loads). However, the ramp
up performance requirements that can occur during failover scenarios and
firmware upgrades can preclude this implementation from being practical and
fail safe. In this release, concurrent scaling beyond 5000 secure clients is not
supported. Nonsecure clients have much less of an impact on the SMC CPU
and as such, there is more latitude in the scaling capability of the SMC for
nonsecure UNIStim clients.
Scaling beyond 5000 clients
The maximum license for an SMC device is 5000 Secure UNIStim users. To
support installations with requirements beyond 5000 users, load balancing of
UNIStim traffic is required.