Hello everybody, this is my first message. :)

I'd like to clarify something that is confusing me for a while.

Reading through cisco documentation at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_52_se/configuration/guide/swspan.html

The author says:

"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."

>From my understanding, after the traffic is routed to a source VLAN, it
enters the VLAN and becomes part of source VLAN's traffic. In other words,
it is flowing on the source VLAN, so it can be monitored by SPAN/RSPAN, am I
correct ?

Why the author mentioned that, since the traffic will be monitored anyway ?

TIA

-- 
CCNA - Cisco Certified Network Associate
CCNP - Cisco Certified Network Professional

"A bird that you set free may be caught again, but a word that escapes your
lips will not return." Jewish Proverb
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