Cisco Catalyst 3750-E - Page 735

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 30 Configuring SPAN and RSPAN
Configuring SPAN and RSPAN
SPAN Configuration Guidelines
• 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.
Yo u m u s t e n ter the 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 the 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.
• You can limit SPAN traffic to specific VLANs by using the filter vlan keyword. If a trunk port is
being monitored, only traffic on the VLANs specified with this keyword is monitored. By default,
all VLANs are monitored on a trunk port.
• You cannot mix source VLANs and filter VLANs within a single SPAN session.
• These guidelines apply to the Catalyst 3560E-12D switch:
– You must specify the destination-port group for an RSPAN source session by entering the
monitor session session_number destination remote vlan vlan-id destination-port group {a
| b | c} global configuration command for these types of sessions:
– The switch supports these destination-port groups, depending on the switch port configuration:
a—
tengigabitethernet 0/1 to tengigabitethernet 0/4 or gigabitethernet 0/1 to gigabitethernet 0/8
b—te
ngigabitethernet 0/5 to tengigabitethernet 0/8 or gigabitethernet 0/9 to
gigabitethernet 0/16
c—
tengigabitethernet 0/9 to tengigabitethernet 0/12 or gigabitethernet 0/17 to
gigabitethernet 0/24