>You live on First Street. One afternoon, instead of cursing at your
>routers, you take out your frustration by yelling out your window, >"Hey
>neighbors, I think you're all ugly." Now let's say that some of >your
>neighbors decide to rename their side of the street from First >Street to
>Main Street. When you yell out the window, won't they >still hear you?
>Renaming their street would be like giving them IP >addresses in a
>different subnet.
>
>Now, who can follow up with a VLAN example??! &;-)
>
>Priscilla
Here's a good one for multiple VLANs...
Your neighbors get fed up with your insults and in turn, decide to brick up
your window. :o
Fred
>From: Priscilla Oppenheimer <[EMAIL PROTECTED]>
>Reply-To: Priscilla Oppenheimer <[EMAIL PROTECTED]>
>To: "Tony Chen" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
>Subject: Re: Creating Multiple Interfaces on an Ethernet Port
>Date: Tue, 20 Feb 2001 11:55:36 -0800
>
>Adding a secondary IP address won't affect the number of broadcast domains.
>Secondary IP addressing is a network-layer configuration. Broadcasts are a
>physical and data-link layer issue. All stations in a LAN hear each others
>broadcasts because they either share a cable, are connected via hubs which
>forward all bits, or are connected via switches which forward all
>broadcasts.
>
>Here's an analogy:
>
>You live on First Street. One afternoon, instead of cursing at your
>routers, you take out your frustration by yelling out your window, "Hey
>neighbors, I think you're all ugly." Now let's say that some of your
>neighbors decide to rename their side of the street from First Street to
>Main Street. When you yell out the window, won't they still hear you?
>Renaming their street would be like giving them IP addresses in a different
>subnet.
>
>Now, who can follow up with a VLAN example??! &;-)
>
>Priscilla
>
>At 10:48 AM 2/20/01, Tony Chen wrote:
> >Follow up question to the secondary IP address on the ethernet interface:
> >
> >When you add secondary IP address to an ethernet interface, does that
> >create multiple broadcast domains, or still one broadcast domain?
> >
> >Tony
> >
> > >>> Priscilla Oppenheimer <[EMAIL PROTECTED]> 02/19/01 09:33PM >>>
> >At 04:47 PM 2/19/01, Chris Wornell wrote:
> > >Hello,
> > >
> > >I've found out you can't create multiple interfaces on an ethernet port
> > >apparently. I was wondering why this is exactly? I know you can
>accomplish
> > >the same on serial lines using pvc's but it seems odd you can't do it
>on
> > >ethernet.
> >
> >Why do you want to create multiple interfaces on your Ethernet port?
> >Ethernet was designed as a connectionless, packet-switched shared
>network.
> >Serial links, on the other hand, are more often used for
> >connection-oriented virtual circuits. Subinterfaces let you associate a
> >single physical link with multiple virtual circuits.
> >
> > > I know there are ethernet only networks and the ip secondary
> > >command doesn't seem right compared to creating a new interface.
> >
> >Sure there are Ethernet-only networks. Each physical Ethernet port on a
> >router is usually associated with an IP subnet. If you happen to have two
> >IP subnets on the LAN to which a physical port is attached, you could use
>a
> >secondary IP address as a workaround to this problem. Traffic between
> >subnets would still go through the router usually.
> >
> >If you're using your Ethernet port as a "trunk port," and you use ISL or
> >802.1q VLAN encapsulation, then you can configure subinterfaces. In this
> >case, subinterfaces let you associate a single physical link with
>multiple
> >VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN
>identification
> >information as traffic travels between connected switches.
> >
> >Maybe you can give us a better idea of what you are trying to accomplish
> >and we can provide more tailored information, but I hope this info was
> >somewhat useful.
> >
> >Priscilla
> >
> >
> >
> > >Chris Wornell
> > >Technical Support
> > >MM Internet http://mminternet.com
> > >888-654-4971
> > >CCNA, CCDA, CSE
> > >
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> >________________________
> >
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> >http://www.priscilla.com
> >
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>________________________
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>http://www.priscilla.com
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