Contemporary-control-systems Compact Managed Switches Software Manual for Web B Uživatelský manuál Strana 20

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4.4.3 Configure Port Mirroring
Port mirroring allows a port to copy or “mirror” traffic for one or many ports useful
when a diagnostic tool is used. Switches normally send frames only to ports involved in
a conversation, so mirroring is required if a diagnostic tool must capture network traffic.
Various settings control how data is mirrored, but apply only if (in Figure 16, upper panel)
the Status option is enabled and a Mirror Port (to which the data is copied) is specified.
Ingress (Ingoing) Mirroring Rules (centre panel) apply to data received by the Source
Ports being mirrored; Egress (Outgoing) Mirroring Rules (lower panel) for data sent
by Source Ports being mirrored. Both sets of rules allow a MAC Address Filter and a
MAC Address to be defined. The Divider specifies the fraction of frames copied from
each source port.
The MAC Address options are:
Allmirrors all traffic regardless of MAC address. This is the default.
Source mirrors frames whose source addresses match the entered value.
Destination mirrors frames whose destination addresses match the entered value.
Figure 16Configure Port Mirroring for 8-port Models
Figure 16 is for an 8-port model. A 16- or 24-port screen would be similar but simply
display more ports. The example has ports 2 and 3 as Ingress Source Ports and port 4
as the sole Egress Source Portall to be copied to port 1. Since the Ingress Divider is
1, each frame from ports 2 and 3 will be mirrored but only if its source address
matches 0050DBFF0000. The Egress Divider value is 10, so only 1 in 10 frames
transmitted by port 4 will be mirrored and since the Egress MAC Address setting is
All, the source/destination address field in the transmitted frames will be ignored.
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