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Hello and welcome. My name is Keith Barker.

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And one of the cool features in the world of networking is the concept of a

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packet capture.

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We can see exactly what's happening as those packets bring sent over the wire.

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However,

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if we want a packet capture, for example, stuff that's happening over here on

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port 1/2

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and our protocol analyzer and the packet capture software is over on port

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number 3/3,

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how do we mirror or replicate those copies of those packets over to our

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protocol analyzer

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reports, we can actually look at the traffic. Well, one answer to that in the

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world of Cisco
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world of Cisco

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is the concept of port mirroring. Now in Cisco, they call it switched port

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analyzer or span for

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short. But basically what it is is port mirroring, taking the copies of the

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data from either a port

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or a VLAN, replicating them over to a destination port or we can then look at

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them. Meaning look

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at that with a protocol analyzer. So in this set of videos, I'd like to walk

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through the

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concepts and options regarding switched port analyzer, including span, R span

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and ER

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span. And the great news is that once we walk through those options, I'll also

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give you an

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opportunity to end up this set of videos to do a hands-on lab with span to get
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opportunity to end up this set of videos to do a hands-on lab with span to get

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practice on your

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own. So if you're ready, I'll see you my friend in the very next video.