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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter29 Configuring SPAN and RSPAN Configuring SPAN and RSPAN
Default SPAN and RSPAN Configuration
Table29-1 shows the de fault SPAN and RSPAN configuration.
Configuring Local SPAN
These sections contain this configuration information:
•SPAN Configuration Guidelines, page 29-11
•Creating a Local SPAN Session, page 29-12
•Creating a Local SPAN Session and Configuring Incoming Traffic, page29-14
•Specifying VLANs to Filter, page 29-15

SPAN Configuration Guidelines

Follow these guidelines when configuring SPAN:
•On each switch stack, you can configure a maximum of 2 source sessions and 64 RSPAN destination
sessions. A source session is either a local SPAN session or an RSPAN source session.
•For SPAN sources, you can monitor traffic for a single port or VLAN or a series or range of ports
or VLANs for each session. You cannot mix source ports and source VLANs within a single SPAN
session.
•The destination port cannot be a source port; a source port cannot be a destination port.
•You cannot have two SPAN sessions using the same destination port.
•When you configure a switch port as a SPAN destination port, it is no longer a normal switch port;
only monitored traffic passes through the SPAN destination port.
•Entering SPAN configuration commands does not remove previously configured SPAN parameters.
You m us t en te r th e no monitor session { session_number | all | local | remote} global configuration
command to delete configured SPAN parameters.
•For local SPAN, outgoing packets through the SPAN destination port carry the original
encapsulation headers—untagged, ISL, or IEEE 802.1Q—if t he encapsulation replicate keywords
are specified. If the keywords are not specified, the packets are sent in native form.
•You can configure a disabled port to be a source or destination port, but the SPAN function does not
start until the destination port and at least one source port or source VLAN are enabled.
Table29-1 Default SPAN and RSPAN Configuration
Feature Default Setting
SPAN state (SPAN and RSPAN) Disabled.
Source port traffic to monitor Both received and sent traffic (both).
Encapsulation type (destination port) Native form (untagged packets).
Ingress forwarding (destination port) Disabled
VLAN filtering On a trunk interface used as a source port, all VLANs are
monitored.
RSPAN VLANs None configured.