Cisco Cisco Customer Response Solution Downloads Guía De Diseño

In some configurations, the VoIP Monitor service can receive duplicate voice packets, which causes 
poor speech quality. To avoid this, only Ingress packets to a port are sent to the VoIP monitor service. 
This is a setting for SPAN, which the following switches do NOT support: 1900, 2820, 2900, 
2900XL, 3000, 3100, 3200, 3500XL

In some switches, SPAN cannot use VLANs as sources, which is known as VSPAN. In that case, 
SPAN must designate individual ports to use for monitoring. The following switches do NOT 
support VSPAN: 1200, 1900, 2820, 2900XL, 2950, 3000, 3100, 3200, 3500XL, 3524-PWR XL

For more information, refer to the Voice Over IP Monitoring Best Practices Deployment Guide.

 gives the limits to the number of SPAN and RSPAN sessions that can exist on a switch:

1200

1

1900

1

2820

1

2900

1

2900XL

1

2926GS

5

2926GL

5

2926T

5

2926F

5

2948G

5

2950

1

2980G

5

3000

1

3100

1

3200

1

3500XL

1

3524-PWR XL

1

3508GL XL

1

3550

2

4003

5

4006

5

4912G

5

5000

5

5002

5

5500

5

5505

5

5509

5

6006

30