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Technology Stocks : Cisco Systems, Inc. (CSCO)
CSCO 77.38-0.5%3:59 PM EST
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To: Lerxst who wrote (11473)1/9/1998 3:20:00 PM
From: aladin  Read Replies (1) of 77400
 
Lerxst,

Lets all agree on semantics:

We all use the OSI model so here we go:

Connectivity
Device
Layer Generic Name Special Case

1 Repeater Multiport Repeater
2 Bridge Switch (Layer 2)
3 Router Switch (layer 3)

Now how do we 'create' a layer 2 switch - initially it was just a
multiport bridge, but then hardware and software was developed to
improve performance.

The layer 3 case is more complicated. Companies comming from the
layer 2 side added routing functionality to their switches using
several models (maybe Tom can comment on Bay's strategy).

In our case we have chosen a strategy of using a routing blade (born
of our IOS) that deals with the route decision, security and policy.
Once an approved connection is established its embedded in the
forwarding table and a layer 3 decision is made at layer 2 speeds.

Our 7000 series routers had this capability with a process called
silicon switching several years ago. Embedding this (proven)
technology on the 5500/5000 families was not trivial, but the use of a
full IOS on the routing blade means that instead of a simple routing
decision - our switches have the full run of access lists, security
and policy features available on routers.

John
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