Re: VLAN interfaces on FreeBSD; performance issues

From: Chuck Swiger (cswiger_at_mac.com)
Date: 09/12/05

  • Next message: Sten Daniel Sørsdal: "Re: VLAN interfaces on FreeBSD; performance issues" 
    Date: Mon, 12 Sep 2005 08:52:01 -0400
To: Sten Daniel Sørsdal <lists@wm-access.no>

    Sten Daniel Sørsdal wrote:
    > Chuck Swiger wrote:
    [ ... ]
    >> Because you cannot put one NIC into two genuinely distinct layer-2
    >> collision domains. Spanning Tree Protocol won't recognize a single NIC
    >> as a potential connection or loop, depending.
    >
    > A vlan should be a seen as a single nic.
    > On other platforms, STP considers vlans as independant nics.
    > But would it be multihoming if you are just bridging the vlans?
    > I thought the essence of multihoming was multiple ip networks to which
    > it was a member.

    A VLAN is an abstraction, a way of logically grouping or seperating ports and
    tagging network traffic with a VLAN header, much as an IP subnet is an abstraction.

    A NIC is a network interface. It's a physical object.
    The essence of multihoming is having two (or more) distinct NICs.

    The most common application for multihoming is where a device performs layer-3
    routing between the two or more IP networks, but you could be using SPX/IPX,
    DECnet, or some other non-IP protocol. You can also do bridging at layer-2,
    perhaps because the two sides use a different physical layer (Cat-5 ethernet
    cabling and wireless? Cat5 and thinnet? Cat5 and a dialup PPP link over POTS
    line, ...etc...) 

    -- 
-Chuck
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