Dennis,

Actually, that's not correct.

This can be a bit confusing - at least it had me confused at first.

The reflector port is basically an unused port on the switch where you have
source ports.

Here's what happens conceptually.

Traffic from the source ports specified capture the traffic.

This traffic gets placed on the special rspan vlan.

This traffic then goes to the reflector port.

When the captured traffic hits the reflector port, it gets bounced back onto
the trunk that connects to the upstream switch or the switch that has the
probe, IDS, etc, attached.

I would make sure you understand this and practice configuring different
combo's of traffic capturing.

For example,

Assume you have Cat-1 and Cat-2 and they're trunked together.

Configure traffic capture such that traffic from vlan 30 and inbound traffic
on cat-1 fa0/17 and outbound traffic from Cat-2, port fa0/3 is sent to your
IDS sensor connected to Cat-2, port fa0/9.

1.      Assume that vlan 30 includes ports on both switches.
2.      Repeat except this time, assume that vlan 30 only has ports on
Cat-2.
3.      Repeat except this time, assume vlan 30 only has ports on Cat-1.
4.      Repeat except this time, assume the IDS has to move to a port on
Cat-1

You get the idea.  Span and Rspan aren't that difficult but don't assume if
you get it, there won't be some interesting twists and turns in the
requirements.

So, be prepared and know all the command options and also know the show
commands you need to verify your config.

HTH, Tim

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