Content

| 9.1 |  | Monitoring Switched Network Performance with SPAN and VSPAN |
| 9.1.4 |  | SPAN and VSPAN configuration limitations |

One local SPAN session can be configured and stored in NVRAM on a switch.

When configuring SPAN:

- A port cannot double as a destination port and a source port. It must be one or the other.
- There can only be one destination port.
- An EtherChannel port can only be a SPAN source port.
- For SPAN source ports, sent and received traffic can be monitored for a single port or for a range of ports.
- A switch port configured as a SPAN destination port is no longer a normal switch port. Only monitored traffic passes through the SPAN destination port.
- A SPAN destination port does not participate in any VLAN spanning tree, although spanning tree BPDU’s within source port or VLAN traffic will be copied to SPAN destination ports.