[c-nsp] Cisco Layer 3 Switch Recommendation

[Marcelo Maraboli]

Jim

to "go" from Token Ring to Ethernet, an equipment needs
to "bridge" the frame maintaining the IP Packet intact.

Bridging means:
- strip of L2 headers of incoming L2 protocol (T.Ring)
- keep "copy" L3 info
- put new L2 headers for outgoing L2 protocol (Ethernet)

this is detailed by IEEE 802.1 bridging functions.
These functions may be performed by any BOX that
has >= L2 functionality : i.e. Switch, Bridge, Router,
Gateway, etc..

If a Router has a Token Ring and Ethernet port and
need to forward (Route) an IP Packet between these
interfases, it will perform a bridging (L2) function, because
it (L3) decided that the IP Packet should go from-to these
interfases..

regards,

Jim McBurnett wrote:
> Good point..normally to go from Token ring to Ethernet...
> OR PPP to Ethernet, etc
> You use a router.. Not a switch..
> 
> OR in the really old days you used a Bridge...........
> 
> J 
> 
> -----Original Message-----
> From: Richard Danielli [mailto:richard.danielli at esubnet.com] 
> Sent: Saturday, November 13, 2004 3:21 PM
> To: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Cisco Layer 3 Switch Recommendation
> 
> 
> 
> I thought that routers can change frame types while switches didn't.
> 
> simple enough ?
> 
> -rd-
> 
> Pete Templin wrote:
> 
>>Jim McBurnett wrote:
>>
>>
>>>Ok...
>>>I am gonna go out on a Limb here....
>>>How about a Router that can do switching..
>>
>>
>>A Cisco 2501 Router can be configured to do Frame Relay switching.  I 
>>think we've all considered the 2501 to be a router since day one...
>>
>>pt
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> 
> 
> --
> Richard Danielli
> President, eSubnet
> 
> www.eSubnet.com
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-- 
Marcelo Maraboli Rosselott
Jefe Area de Redes y Comunicaciones (Network & UNIX Systems Engineer)
Ingeniero Civil Electronico                     (Electronic Engineer)

Direccion Central de Servicios Computacionales (DCSC)
Universidad Tecnica Federico Santa Maria, Chile.
phone: +56 32 654237
mailto: marcelo.maraboli @ usm.cl	http://elqui.dcsc.utfsm.cl/