[altq 49] pvc bridging

[Kenjiro Cho <kjc@csl.sony.co.jp>]

I made an experimental pvc bridging kit at
ftp://ftp.csl.sony.co.jp/pub/kjc/pvcbridge-0625.tar.gz.

There are people who want to set ALTQ for their ATM line, but they 
have difficulties:
 - replacing the commercial router with a PC box
 - assigning IP addresses to a new ALTQ box
 - routing setup for a new ALTQ box

This pvc bridging allows to introduce an ALTQ box without touching
the existing IP setting.  If there is an available port at the ATM 
switch, an ALTQ box can be placed only by ATM VC configuration (see 
the figure below). 


                     <------- vc:201 45Mbps ---------->
            +-------+       +------------+
  ==========| cisco |=======| ATM switch |=============
            +-------+  ATM  +------------+     ATM
     LAN                                       WAN



                            +------------+
                         +->| ALTQ box   |<-+
          vc:100 150Mbps |  +------------+  |
                      <--+        || ATM    +- vc:201 45Mbps -->
            +-------+       +------------+
  ==========| cisco |=======| ATM switch |=============
            +-------+  ATM  +------------+     ATM
     LAN                                       WAN


I believe pvc bridging will make the ALTQ deployment much easier.
Thanks to Joseph C. Lappa <lappa@ncne.org> for asking me about
atm-bridging.

Suggestions or opinions?

-Kenjiro Cho