Cisco Catalyst 2960 Series, Configuration Manual

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RSPAN
• We recommend that you configure an RSPAN VLAN before you configure an RSPAN source or a
destination session.
Restrictions for SPAN and RSPAN
SPAN
The restrictions for SPAN are as follows:
• On each switch, you can configure a maximum of 4 (2 if switch is stacked with Catalyst 2960-S switches)
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 must enter 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 cannot mix source VLANs and filter VLANs within a single SPAN session.
Traffic monitoring in a SPAN session has the following restrictions:
• Sources can be ports or VLANs, but you cannot mix source ports and source VLANs in the same session.
• The switch supports up to four local SPAN or RSPAN source sessions. However if this switch is stacked
with Catalyst 2960-S switches, you are limited to 2 local SPAN or RSPAN source sessions.
• You can run both a local SPAN and an RSPAN source session in the same switch or switch stack. The
switch or switch stack supports a total of 64 source and RSPAN destination sessions.
• You can configure two separate SPAN or RSPAN source sessions with separate or overlapping sets of
SPAN source ports and VLANs. Both switched and routed ports can be configured as SPAN sources
and destinations.
• You can have multiple destination ports in a SPAN session, but no more than 64 destination ports per
switch stack.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Restrictions for SPAN and RSPAN