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

Catalyst 6000 series software configuration guide
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Configuring RSPAN
Figure 38-2 RSPAN Configuration
Layer 2 trunk
Switch A

RSPAN Configuration Guidelines

Follow these guidelines when configuring RSPAN:
Tip
As RSPAN VLANs have special properties, we recommend that you reserve a few VLANs across
your network for use as RSPAN VLANs; do not assign access ports to these VLANs.
You can apply an output access control list (ACL) to RSPAN traffic to selectively filter specific flows.
Tip
Specify these ACLs on the RSPAN VLAN in the RSPAN source switches.
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
38-10
Switch D
D1
Layer 2 trunk
C3
Switch C
C1
A3
A1
A2
B1 B2
All the items in the
"SPAN Configuration Guidelines" section on page 38-6
RSPAN sessions can coexist with SPAN sessions within the SPAN/RSPAN limits described in the
"SPAN and RSPAN Session Limits" section on page
For RSPAN configuration, you can distribute the source ports and the destination port across
multiple switches.
For RSPAN, trunking is required if you have a source switch with all source ports in one VLAN
(VLAN 2 for example) and it is connected to the destination switch through an uplink port that is
also in VLAN 2. With RSPAN, the traffic is forwarded to remote switches in the RSPAN VLAN.
The RSPAN VLAN is configured only on trunk ports and not on access ports.
The learning option applies to RSPAN destination ports only.
RSPAN does not support monitoring of BPDU packets or Layer 2 protocol packets such as CDP, DTP,
and VTP.
To optimize bandwidth utilization in the connecting links, you can configure quality of service
(QoS) parameters for the RSPAN VLAN in each of the participating source, intermediate, or
destination switches.
Destination switch
D2
Probe
Intermediate switch
C2
Layer 2 trunk
B4
Source switch(es)
Switch B
B3
Chapter 38
Configuring SPAN and RSPAN
(data center)
(distribution)
(access)
apply to RSPAN.
38-4.
78-13315-02

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