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SIGNAMAX LLC • www.signamax.eu
Port Monitoring Configuration
The chapter explains the port monitoring function supported by Signamax switches and the
configuration procedure.
The chapter explains:
•
Port monitoring overview
•
Port monitoring configuration
•
Viewing port monitoring information
•
Application example
Overview
The port monitoring function monitors packets to be processed by the switch CPU. It filters
superfluous packets in the lower layer to protect the switch from illegal packet attacks.
The monitoring is classified into the port-level and host-level. When a switch under an attack
initially enables the port-level monitoring, the monitoring program gathers statistics of the
packets to be processed by CPU. Users discover the attacked port by statistical data, enable
the host-level monitoring on the port and configure the upper limit value of various packets to
be processed by CPU in a sampling period.
The packets exceeding the upper limit value from the host, who initiates the attack, are
filtered in the lower layer. They are not routed in the IP layer and not written in the hardware
routing table. This way, resources of CPU and hardware table items can be saved.
When performing packet-filtering on the host, who initiates the attack, other hosts still
can communicate normally. The monitoring program records the host (whose packets
need to be processed by the CPU exceed the upper limit value in a sampling period) in
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