At 3:58 PM -0500 9/30/2000, Ejay Hire wrote:
>Pardon me while I blatantly expose my Ignorance.
>
>From the SRB/DLSW chapter in the book "Cisco IOS Essentials". I am
>led to believe that DLSw only works with Token-Ring based traffic.
>Is this correct, or is it possible to take encapsulate (NetBios)
>Ethernet traffic, shuttle it accross the IP backbone, and then drop
>it to a remote bridge peer?
>
>Thanks,
>
>[EMAIL PROTECTED]
>Ejay Hire
>
DLSW is a slightly different model than earlier ones used for
nonroutable applications.
Traditional models
------------------
In traditional bridging, the original frame is passed to the
destination (ignoring details like TR A bits).
In translational bridging, which essentially is the LAN-only
equivalent of what Cisco calls "protocol translation", a frame of one
type is delivered to a medium of another type (e.g., SDLLC from SDLC
to TR).
That which is variously called half bridging, encapsulated bridging,
remote bridging, etc., preserves the complete original frame, wraps
it in a frame or packet needed for the transit medium, and delivers
it to a receiver of the same frame type. This is also called
protocol tunneling.
If the original frame is tunneled to a receiver that translates it to
a frame of a different type (e.g., Ethernet via TCP/IP to TR), this
is an extension of both protocol translation and tunneling (e.g.,
SDLLC over RSRB).
Newer models
------------
DLSW does not preserve the entire frame. At each end of the DLSW
tunnel, layer 2 information is stripped off, and only the frame data
field are encapsulated, typically in TCP/IP, and then sent to the
destination. At the destination, the user data in the packet are
reframed into whatever frame type is used by the destination. The
data links at both ends are completely independent.
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