Q.1: With above config, Should i expect to see VLAN-802.1p/Q header while Sniffig on VSPAN port ? (If answer is YES then, I do not see VLAN header while Sniffing. If answer is NO then, what changes i have to make and why is reason for changes? (To aware myself)
Q.2: Some rated expert on this forum mentioend that to enable trunking. BUT on which port and why? (Isn't it true that 802.1/Q trunking is used to carry Multi-VLAN traffic which is used for inter-VLAN routing. Well in my case i have only one VLAN=99)
Q3: Any changes on SPAN command like *** "Incoming Packets: disabled" (..), "learning: enabled" ***.
If all above looks OK then is it NIC realted? PL HELP ASAP...Thx
Re: HELP: Don't see VLAN header while Sniffing on VSPAN : Thx
Q1: You will not observe any vlan info. vlan info is only present on trunks. A normal network node does not "understand" the meaning of a tagged frame and will discard it. You can see it as something that's proprietary to trunk links. When you want to sniff the packets that are tagged with 802.1q trunking info, you will obviously need to attach your sniffer to a trunk link.
Q2: True, trunking is used to carry Multi-VLAN traffic. Trunking is needed to distinguish between vlans when the packets for multiple vlans are transported over the same link. The receiving side removes the tagging before passing on the frame.
Q3: I honestly do not know if the trunking info is preserved when the data is copied to a span-port. To be certain to catch it, you could attach a hub with your sniffer between the two sides of a trunk. You may get errors due to duplex mismatches but it should be possible to catch a few frames when the load is not too high.
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