Cisco Cisco Customer Response Solution Downloads Design Guide
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Cisco IPCC Express Solution Reference Network Design
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A P P E N D I X
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Voice Over IP Monitoring
The VoIP monitor service for IPCC Express is targeted for the Cisco line of Catalyst switches. It relies
on a Switched Port Analyzer (SPAN) session configured on the switch, which allows the IP traffic from
one or more ports to be copied and sent to a single destination port. The switch issues known at this time
are described in this appendex. For more information, consult the Voice Over IP Monitoring Best
Practices Deployment Guide.
on a Switched Port Analyzer (SPAN) session configured on the switch, which allows the IP traffic from
one or more ports to be copied and sent to a single destination port. The switch issues known at this time
are described in this appendex. For more information, consult the Voice Over IP Monitoring Best
Practices Deployment Guide.
The following switches do NOT support SPAN sessions:
1700, 2100, 2800, 2948G-L3, 4840G
Local SPANs (LSPANs) are SPANs where all the source ports and the destination port are physically
located on the same switch. Remote SPANs (RSPANs) can include source ports that are physically
located on another switch. The following switches do NOT support RSPAN (although they may be an
intermediate switch in an RSPAN configuration):
located on the same switch. Remote SPANs (RSPANs) can include source ports that are physically
located on another switch. The following switches do NOT support RSPAN (although they may be an
intermediate switch in an RSPAN configuration):
1200, 1900, 2820, 2900, 2900XL, 2926GS, 2926F, 2926T, 2948G, 2950, 2980G, 3000, 3100, 3200,
3500XL, 3524-PWR XL, 3508GL XL, 3550, 5000, 5002, 5500, 5505, 5509
3500XL, 3524-PWR XL, 3508GL XL, 3550, 5000, 5002, 5500, 5505, 5509
Some switches do not allow the destination port of a SPAN configuration to act as a normal network
connection. The only traffic that can flow through this port is the traffic copied from the SPAN source
ports; this requires the computer running the VoIP monitor service to have two network connections
(NICs) to function properly. The following switches do NOT support normal network traffic on SPAN
destination ports:
connection. The only traffic that can flow through this port is the traffic copied from the SPAN source
ports; this requires the computer running the VoIP monitor service to have two network connections
(NICs) to function properly. The following switches do NOT support normal network traffic on SPAN
destination ports:
2950, 3000, 3100, 3200, 3550
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:
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:
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
The following table gives the limits to the number of SPAN and RSPAN sessions that can exist on a
switch:
switch: