| Publisher | Stanford Knowledgebase | ||
|---|---|---|---|
| Format | 30.9KB PDF, requires Acrobat Rdr 5 | Date added | 13 Jul 2001 |
| Topics | Switching, Monitoring Systems | ||
| Downloads | 20 | ||
Packet switches (e.g., IP routers, ATM switches and Ethernet switches) maintain statistics for a variety of reasons: performance monitoring, network management, security, network tracing, and traffic engineering. The statistics are usually collected by counters, which might, for example, count the number of arrivals of a specific type of packet, or count particular events, such as when a packet is dropped. The arrival of a packet may lead to several different statistics counters being updated. The number of statistics counters and the rate at which they are updated is often limited by memory technology. A small number of counters may be held in on-chip registers or in (on- or off-chip) SRAM. But often, the number of counters is very large, and hence they need to be stored in off-chip DRAM. However, the large random access times of DRAMs make it difficult to support high bandwidth links.
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