Cisco WS-C2950SX-48-SI Configuration Manual page 406

Configuring RSPAN
source ports in the access switches (other ports in any of the switches can also be configured for
RSPAN). If there is no change in the route for SPAN traffic, the destination switch and the intermediate
switches need to be configured only once.
In Figure
probe 2). The direction of traffic over trunks T1 through T6 is shown only for understanding; the
direction of the trunks depends on the STP states of the respective trunks for the RSPAN VLAN(s). You
need to configure the RSPAN VLANs in each of the switches for the respective RSPAN sessions. With
VTP enabled in the network, you can create the RSPAN VLAN in one switch and VTP propagates it to
the other switches in that VTP domain. With VTP disabled, create the RSPAN VLANs in each switch.
Figure 26-5 Configuring Multiple RSPAN Sessions
Switch A
Table 26-4 Configuring Multiple RSPAN Sessions
Switch Port
A (source) 2/1-2
B (source) 3/1-2
C (intermediate) –
D (destination) 2/1
D (destination) 2/2
E (source) 4/1-3
F (intermediate) –
Adding Multiple Network Analyzers to an RSPAN Session
You can attach multiple network analyzers (probes) to the same RSPAN session. For example, in
Figure
destination 1/2 901 command. Similarly, you could add source ports to Switch C.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
26-16
26-5, two RSPAN sessions are used with RSPAN VLANs 901 (for probe 1) and 902 (for
Probe 1
2/1
1/1
T1
1/2
Switch C
3/1 3/2 3/3
T3 T4
1/1 1/2
2/1 2/2 2/3
Reflector RSPAN
Port VLAN(s)
2/3 901
3/3 901
– 901, 902
– 901
– 902
4/4 901
– 901, 902
26-6, you can add probe 3 in Switch B to monitor RSPAN VLAN 901 using the set rspan
Switch D
Probe 2
2/2
1/2
T2
1/2
3/1 3/2 3/3
T6
T5
Switch B
1/1
1/1 1/2
3/1 3/2 3/3 4/1 4/2
Direction RSPAN CLI Commands
Ingress set rspan source 2/1-2 901 rx reflector 2/3
Egress set rspan source 3/1-2 901 tx reflector 3/3
– No RSPAN CLI command needed
– set rspan destination 2/1 901
– set rspan destination 2/2 902
Both set rspan source 4/1-3 902 reflector 4/4
– No RSPAN CLI command needed
Chapter 26 Configuring SPAN and RSPAN
Destination switch
(data center)
Intermediate switch(es)
Switch F
(distribution)
Source switch(es)
(access)
1/2
Switch E
4/3 4/4
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Release 8.1
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