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vlan(4) and agr(4) questions


I have two questions about vlan(4) interface.

Several times I had to debug 802.1q packets and found that tcpdump can show 
VLAN tags only on few number of network cards. I assumed that network card 
strip 802.1q and store this information along with packet. 

So, is it true, that vlan driver is pretty smart to take vlan tag from card, 
when it is provided or parse whole packet if 802.1q is not supported on 

Also, is it possible to catch clear IP packets, in their real condition?

And the second one - having recent netbsd-4 I've tried to construct vlan(4) 
over agr(4) on two bge(4) BCM5721 interfaces - it seems not to work at all. 
vlan on bge is working, agr on both bge seems to work too (Cisco 2950 says its 
UP and running), but vlan-agr-bge seems to work only on received packets.

In that configuration I can see incoming tagged packets are properly goes to 
vlan(4) interfaces, but outgoing are always fall to switch's native vlan.

What can be the problem in that case? And how can I debug this? Routes were 
flushed (even booted with that configuration)

Sincerelly yours

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