From: Glenn Goldie (ggoldie2@lineone.net)
Date: Sun Jul 27 2003 - 12:33:49 GMT-3
Hello Kristof,
The following is from the 3550 config guide:
" A trunk port configured with 802.1Q tagging can receive both tagged
and untagged traffic. By default, the switch forwards untagged traffic
in the native VLAN configured for the port. The native VLAN is VLAN 1 by
default."
and
" If a packet has a VLAN ID that is the same as the outgoing port native
VLAN ID, the packet is sent untagged; otherwise, the switch sends the
packet with a tag. "
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12114ea1/3550scg/swvlan.htm#1101186
So the packets are not dropped, they are forwarded but without any dot1q
tags. I'm assuming your linux boxes were ignoring the native vlan data
because they were watching for tagged packets only. So your solution
made sense (to make the native vlan 10, therefore vlans 1,2,3 traffic is
all sent tagged). Maybe you could configure the linux boxes to have a
native vlan also?
Rgds,
Glenn.
>
> Can somebody confirm this assumption.
> The dot1q standard tells us to put all untaged packets in the native
> (definable on the trunk)
> But I don't find anything about packets which are taged whith a VlanId which
> is the same as the native.
> I think these packets are dropped.
>
> Kristof.
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