SPAN problem,is it my understanding right?

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Mar 5th, 2007
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"Only traffic that enters or leaves source ports or traffic that enters or leaves source VLANs can be monitored by using SPAN; traffic routed to a source VLAN cannot be monitored. For example, if

incoming traffic is being monitored, traffic that gets routed from another VLAN to the source VLAN cannot be monitored; however, traffic that is received on the source VLAN and routed to another VLAN can be monitored."


1.Receive SPAN:

Packets will be forworded to destinations before modification (routing(modified TTL ,MAC-address) or QoS) or doping (ACLs , ingress QoS policing ,VLAN ACLs or egress Qos policing).

2.Transit SPAN:

the packets sent by the source interface after all modification(TTL,MAC-address,QoS values) and processing(ACLs and egresss QoS) is performed by the switch.

3.packes like ping the sourece interfaces,will not be monitored.



reference link:

http://www.cisco.com/en/US/products/hw/switches/ps5528/products_configuration_guide_chapter09186a00802b7c55.html#wp1210541

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