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DGS-3400 Series Layer 2 Gigabit Managed Switch CLI Manual
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15
P
ORT
M
IRRORING
C
OMMANDS
The port mirroring commands in the Command Line Interface (CLI) are listed (along with the appropriate parameters) in the
following table.
Command Parameters
config mirror port
<port> [add | delete] source ports <portlist> [rx | tx | both]
enable mirror
disable mirror
show mirror
Each command is listed, in detail, in the following sections.
config mirror port
Purpose
Used to configure a mirror port
−
source port pair on the Switch. Traffic from any source
port to a target port can be mirrored for real–time analysis. A logic analyzer or an RMON
probe can then be attached to study the traffic crossing the source port in a completely
obtrusive manner.
Syntax
config mirror port <port> [add | delete] source ports <portlist> [rx | tx | both]
Description
This command is used to allows a range of ports to have all of their traffic also sent to a
designated port, where a network sniffer or other device can monitor the network traffic.
In addition, users can specify that only traffic received by or sent by one or both is
mirrored to the Target port.
Parameters
<port>
−
This specifies the Target port (the port where mirrored packets will be received).
The target port must be configured in the same VLAN and must be operating at the same
speed a s the source port. If the target port is operating at a lower speed, the source port
will be forced to drop its operating speed to match that of the target port. The port is
specified by listing the lowest switch number and the beginning port number on that
switch, separated by a colon. For example, 1:3 specifies switch number 1, port 3. 2:4
specifies switch number 2, port 4.
[add | delete]
– Specifies to add or delete ports to be mirrored which are specified in the
source ports
parameter.
source ports
– The port or ports being mirrored. This cannot include the Target port.
•
<portlist>
−
This specifies a port or range of ports that will be mirrored. That is,
the range of ports in which all traffic will be copied and sent to the Target port.
That is, the range of ports in which all traffic will be copied and sent to the Target
port. The port list is specified by listing the lowest switch number and the
beginning port number on that switch, separated by a colon. Then the highest
switch number, and the highest port number of the range (also separated by a
colon) are specified. The beginning and end of the port list range are separated
by a dash. For example, 1:3 specifies switch number 1, port 3. 2:4 specifies
switch number 2, port 4. Non–contiguous portlist entries are separated by a
comma. (ex: 1:1–1:3,1:7–1:9)
rx
−
Allows the mirroring of only packets received by (flowing into) the port or ports in the
port list.
tx
−
Allows the mirroring of only packets sent to (flowing out of) the port or ports in the
port list.
both
−
Mirrors all the packets received or sent by the port or ports in the port list.
Restrictions
The Target port cannot be listed as a source port. Only Administrator and Operator-level
users can issue this command.
Example usage: