misc/79352: no double tagged q-in-q nested vlan support

Donatas Gendvilas donatas at lrtc.net
Tue Mar 29 21:30:03 PST 2005

>Number:         79352
>Category:       misc
>Synopsis:       no double tagged q-in-q nested vlan support
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Mar 30 05:30:02 GMT 2005
>Originator:     Donatas Gendvilas
>Release:        5.3-Release i386
SC "Lithuanian radio and television centre"
FreeBSD watcher.lrtc.net 5.3-RELEASE FreeBSD 5.3-RELEASE #0: Fri Nov  5 04:19:18 UTC 2004     root at harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
      Most of today's core switches allready support double tagged ("q-in-q" by cisco or "nested" by allied telesyn) vlans. With free-bsd machines it is only possible to use single-tagged vlans. This problem exsits in all Free-BSD releases.
theoretical example:
ifconfig vlan1 create
ifconfig vlan1 vlan 1 vlandev fxp0
ifconfig vlan2 create
ifconfig vlan2 vlan 2 vlandev vlan 1
      we thing if_vlan.c should be modified to accept creation of double vlans and to deny creation of tripple, quad tagged vlans....

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