Monitoring and Analyzing Switch Operation

Traffic Mirroring

Syntax: [no] mirror < 1 - 4 > [name < name-str>] remote ip < src-ip>

<src-udp-port > < dst-ip >

<src-udp-port >: This parameter associates the remote session with a UDP port number. When multiple sessions have the same source IP address < src-ip > and destination IP address < dst-ip>, the UDP port number must be unique in each session. The UDP port number used for a given session should be in the range of 7933 - 65535.

Caution: UDP port numbers below 7933 are reserved for various IP applications. Using them for mirroring can result in the interruption of other IP functions, and in non-mirrored traffic being received on the destination switch and sent to a device connected to the remote exit port.

The configured UDP port number is included in the frames mirrored from the source switch to the remote destination switch (mirror endpoint), and enables the remote switch to match the frames to the exit port configured for the combined UDP port number, source IP address, and destination IP address. Refer to the mirror endpoint ip command syntax in “2. Configure a Mirroring Destination on a Remote Switch” on page B-50for more information.

<dst-ip>: For the remote session specified in the command, this is the IP address of the VLAN or subnet on which the remote exit port exists. (The exit port to which a traffic analyzer or IDS is connected is configured on the remote switch in Step 2; see “2. Configure a Mirroring Destination on a Remote Switch” on page B-50.)

4.Configure the Monitored Traffic in a Mirror Session

This step configures one or more interfaces on a source switch with traffic- selection criteria to select the traffic to be mirrored in a local or remote session configured in Step 3.

Traffic Selection Options

To configure traffic mirroring, specify the source interface, traffic direction, and criteria to be used to select the traffic to be mirrored by using the following options:

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