Configuring Rspan - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 38 Configuring SPAN and RSPAN
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Configuring RSPAN

The first step in configuring an RSPAN session is to select an RSPAN VLAN for the RSPAN session that
does not exist in any of the switches that will participate in RSPAN. With VTP enabled in the network,
you can create the RSPAN VLAN in one switch and VTP propagates it to the other switches in the VTP
domain.
Use VTP pruning to get efficient flow of RSPAN traffic, or manually delete the RSPAN VLAN from all
trunks that do not need to carry the RSPAN traffic.
Once the RSPAN VLAN is created, you configure the source and destination switches using the set
rspan command.
To configure RSPAN VLANs, perform this task in privileged mode:
Task
Step 1
Configure RSPAN VLANs.
Step 2 Verify the RSPAN VLAN configuration.
This example shows how to set VLAN 500 as an RSPAN VLAN:
Console> (enable) set vlan 500 rspan
vlan 500 configuration successful
Console> (enable)
Console> (enable) show vlan
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display truncated
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Each Catalyst 6000 family switch can source a maximum of one RSPAN session (ingress, egress, or
both). When you configure a remote ingress or bidirectional SPAN session in a source switch, the
limit for local ingress or bidirectional SPAN sessions is reduced to one. There are no limits on the
number of RSPAN sessions carried across the network within the RSPAN session limits (see the
"SPAN and RSPAN Session Limits" section on page
RSPAN VLANs cannot be included as sources for port-based RSPAN sessions when source trunk
ports have active RSPAN VLANs. Additionally, RSPAN VLANs cannot be sources in VSPAN
sessions.
You can configure any VLAN as an RSPAN VLAN as long as these conditions are met:
The same RSPAN VLAN is used for an RSPAN session in all the switches.
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All participating switches have appropriate hardware and software.
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No access port (including the sc0 interface) is configured in the RSPAN VLAN.
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If you enable VLAN Trunk Protocol (VTP) and VTP pruning, RSPAN traffic is pruned in the trunks
to prevent the unwanted flooding of RSPAN traffic across the network.
If you enable GARP VLAN Registration Protocol (GVRP) and GVRP requests conflict with existing
RSPAN VLANs, you might observe unwanted traffic might in the respective RSPAN sessions.
You can use RSPAN VLANs in Inter-Switch Link (ISL) to dot1q mapping. However, ensure that the
special properties of RSPAN VLANs are supported in all the switches to avoid unwanted traffic in
these VLANs.
38-4).
Command
set vlan vlan [rspan]
show vlan
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Configuring RSPAN
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