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Chapter1 Configuring Interfaces and Circuits
Configuring the Switched Port Analyzer Feature
1-46
Cisco Content Services Switch Routing and Bridging Configuration Guide
OL-4580-01
This section describes how to configure SPAN on a CSS. It includes the following
topics:
• Configuring SPAN on a CSS
• Verifying the SPAN Configuration on a CSS
Configuring SPAN on a CSS
To configure SPAN on a CSS, use the setspan command. This command instructs
the CSS to monitor all incoming and/or outgoing traffic on a specified SSPAN
port by copying the packets to a specified DSPAN port on the same module in the
CSS. This feature is disabled by default.
The syntax of this global configuration mode command is:
setspan src_port number dest_port number
copyBoth|copyTxOnly|copyRxOnly
The options and variables for this command are as follows:
• src_port number - Source port keyword and number of the SSPAN port (in
slot/port format) that you want to monitor. The CSS copies all packets that
are received or transmitted on this port to the DSPAN port.
• dest_port number - Destination port keyword and number of the DSPAN port
(in slot/port format) where you want to connect the network analyzer,
protocol analyzer, or RMON probe. The CSS copies the packets that flow
through the SSPAN port to the DSPAN port that you specify. The DSPAN port
must reside on the same module as the SSPAN port.
Note Once you configure a port as a DSPAN port, the CSS removes it from
all VLANs and ignores ingress traffic on that port. In addition, the
DSPAN port does not participate in spanning tree protocol (STP) or
routing protocols such as RIP and OSPF.
• copyBoth - CSS copies to the DSPAN port packets that the SSPAN port
transmits to the network (egress traffic) and packets that the SSPAN port
receives from the network (ingress traffic).