cisco 3750 switches and non-ip protocol

Answered Question
Dec 8th, 2008

hi every body!

Cisco 3750 switches provide fallback bridging to transparent non ip protocols such as ipx because cef only supports ip.

My question is can switch use layer 3 engine(router) to switch non-ip packets such as ipx ?

thanks a lot!

I have this problem too.
0 votes
Correct Answer by Edison Ortiz about 7 years 11 months ago

SNA, ah good old memories, yeah right...

Two options which are not supported in switches. STUN (Serial Tunneling) or DLSW (Data Link Switching).

You need a good old router.

Never had the pleasure to play with LAT but I'm sure you also need a router for it.

__

Edison.

Correct Answer by Edison Ortiz about 7 years 11 months ago

Sarah,

The reason the 3750 does not provide IPX support is not due to the CEF/IP dependency. It's due to lacking the required ASIC to perform this function.

As Jon stated, Cisco provides a line that support IPX (Catalyst 6500) but even within that line, the support is done in software - not in hardware (ASICs) which can result on degraded IPX performance.

If you have an IPX network (I'm sure you don't - you are just hitting those books hard and keeping us in line :)), I recommend going with a regular router with Enterprise software and have this router perform the IPX routing in your network. IPX is a dead protocol and there isn't much testing done on it.

HTH,

__

Edison.

Correct Answer by Jon Marshall about 7 years 11 months ago

Sarah

Some L3 switches can route IPX but the 3750 is not one of them. There is no support for IPX other than the use of fallback bridging.

Jon

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Correct Answer
Jon Marshall Mon, 12/08/2008 - 14:23

Sarah

Some L3 switches can route IPX but the 3750 is not one of them. There is no support for IPX other than the use of fallback bridging.

Jon

Correct Answer
Edison Ortiz Mon, 12/08/2008 - 15:01

Sarah,

The reason the 3750 does not provide IPX support is not due to the CEF/IP dependency. It's due to lacking the required ASIC to perform this function.

As Jon stated, Cisco provides a line that support IPX (Catalyst 6500) but even within that line, the support is done in software - not in hardware (ASICs) which can result on degraded IPX performance.

If you have an IPX network (I'm sure you don't - you are just hitting those books hard and keeping us in line :)), I recommend going with a regular router with Enterprise software and have this router perform the IPX routing in your network. IPX is a dead protocol and there isn't much testing done on it.

HTH,

__

Edison.

Jon Marshall Mon, 12/08/2008 - 16:14

Edison

"IPX is a dead protocol and there isn't much testing done on it."

Can i quote you on that ?.

Last place i worked we migrated to a lovely new MPLS network and then had to define GRE tunnels all over the place because of one "mission critical" IPX application. They are always mission critical :-)

Jon

sarahr202 Mon, 12/08/2008 - 16:31

Just want to ask about catalyst 4500 and 6500 series switches. If the protocol is not routable such as SNA ,LAT, how can these switches switch such traffic(SNA,LAT) considering layer 3 engine can not be of any use in such situation.

Thanks a lot!

Correct Answer
Edison Ortiz Mon, 12/08/2008 - 16:42

SNA, ah good old memories, yeah right...

Two options which are not supported in switches. STUN (Serial Tunneling) or DLSW (Data Link Switching).

You need a good old router.

Never had the pleasure to play with LAT but I'm sure you also need a router for it.

__

Edison.

Edison Ortiz Mon, 12/08/2008 - 16:32

Sure you can :)

Ask Novell if they are deploying IPX dependent applications internally. Their internal network hasn't run IPX for some time. IOW, it's deader than dead :)

Yes, you will find plenty of networks having those mission critical IPX applications. They are slow on migrating to up-to-date applications that do the same. Usually, the person/group that deployed such application is no longer around in business and no-one understands how the application really works in a different environment :)

__

Edison.

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