Re: [nsp] Routing between VLANs using 802.1q

From: George Robbins (grr@shandakor.tharsis.com)
Date: Mon Jan 24 2000 - 13:03:19 EST


> Date: Mon, 24 Jan 2000 18:12:31 +0100
> From: Michael Beckmann <petzi@apfel.de>
> To: George Robbins <grr@shandakor.tharsis.com>
> Cc: cisco-nsp@puck.nether.net
> Subject: Re: [nsp] Routing between VLANs using 802.1q
>
> On Mon, Jan 24, 2000 at 01:10:43AM -0500, George Robbins wrote:
> > You do know that you create sub-interfaces and that the encap goes
> > on the sub-interface, not the main one? It's not obvious until
> > you've been there.
>
> Does this mean, I can do standard Ethernet and 802.1q at the same
> time ?

yes. the 802.1q packets are tagged and a "trunk" port on the switch
handles them by directing them to a specific vlan, the non-tagged
packets are handled per the vlan membership of the switch port.
>
> I also believed that I should set the VLAN of the respective switch
> interface to "trunk". Is this not correct ?

yes.

> The documentation about this seems to be rather scarce, or is it
> just the search engine on Cisco´s website ?

It's a bit scarce, but there should be something in the IOS configuration
guide about setting up ethernet with ISL/802.1q tagging and more in the
documentation for the switch.

                                                        George



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