User Documentation
2053260000/05/201550
Planning
Port mirroring
Port mirroring means that the entire network trafc of the ports to be monitored is
emulated to a mirror port to obtain control of the data volume and data contents.
This way it is possible, e.g., to create history entries or logles.
Fault relay (security/debugging)
Many switches provide the triggering option of a programmable relay, in order to
obtain information about a change of status. You can, for example, connect visual
or acoustic signal transmitters to this relay.
Bandwidth limitation
A bandwidth limitation is advisable as soon as a 10-Mbps terminal has no auto-
negotiation function. The terminal can then use the maximum bandwidth that is
technically possible for it.
IGMP
The IGMP protocol can be used to send identical content to several user PCs.
The IGMP-capable router duplicates the data packets that are to be sent to several
users and then sends them on the requested trip.
IGMP snooping
• A checking of the Multicast ow
• Monitors the exchange between router and host
• Modies the bridge table