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Catalyst 3560 Switch Software Configuration Guide
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Chapter 28 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
A physical port that belongs to an EtherChannel group can be configured as a SPAN source port and
still be a part of the EtherChannel. In this case, data from the physical port is monitored as it
participates in the EtherChannel. However, if a physical port that belongs to an EtherChannel group
is configured as a SPAN destination, it is removed from the group. After the port is removed from
the SPAN session, it rejoins the EtherChannel group. Ports removed from an EtherChannel group
remain members of the group, but they are in the inactive or suspended state.
If a physical port that belongs to an EtherChannel group is a destination port and the EtherChannel
group is a source, the port is removed from the EtherChannel group and from the list of monitored
ports.
• Multicast traffic can be monitored. For egress and ingress port monitoring, only a single unedited
packet is sent to the SPAN destination port. It does not reflect the number of times the multicast
packet is sent.
• A private-VLAN port cannot be a SPAN destination port.
• A secure port cannot be a SPAN destination port.
For SPAN sessions, do not enable port security on ports with monitored egress when ingress
forwarding is enabled on the destination port. For RSPAN source sessions, do not enable port
security on any ports with monitored egress.
• An IEEE 802.1x port can be a SPAN source port. You can enable IEEE 802.1x on a port that is a
SPAN destination port; however, IEEE 802.1x is disabled until the port is removed as a SPAN
destination.
For SPAN sessions, do not enable IEEE 802.1x on ports with monitored egress when ingress
forwarding is enabled on the destination port. For RSPAN source sessions, do not enable
IEEE 802.1x on any ports that are egress monitored.
Configuring SPAN and RSPAN
These sections contain this configuration information:
• Default SPAN and RSPAN Configuration, page 28-9
• Configuring Local SPAN, page 28-10
• Configuring RSPAN, page 28-16

Default SPAN and RSPAN Configuration

Tabl e 28-1 shows the default SPAN and RSPAN configuration.
Tab l e 28-1 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