Hi Kevin,
each PFE (24 ports) on EX3200/EX4200 has approximately 2.5 MB.
*** Buffer Mgmt on EX4200 platform ***
Each port gets resources from two pool types:
- "Dedicated" pool
- "Shared" pool
The allocation of buffers from the Dedicated pool is controlled by configuration:
- If a buffer-size percentage is configured for a class, the number of buffers assigned will be proportional to that percentage
- If no buffer-size is configured for a class or classes, the remaining percentage will be equally shared between those classes
The allocation of buffers from the Shared pool is dynamically performed according to the queueing needs of a class, and it cannot be controlled by configuration
- When a queue needs to buffer traffic, it first consumes the allocated resources from the Dedicated pool. Once those resources are consumed, it may get assigned more buffers from the Shared pool
- Only PLP low traffic may get buffers from the Shared pool
- Thus the number of PLP high packets that may be queued is bounded by the size of the Dedicated pool
Kind Regards
Michael Pergament
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