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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Priscilla Oppenheimer
http://www.priscilla.com
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