Re: Bridging

[Stuart Booth]

On Sat, 13 Mar 2004 12:02:01 -0000, "Paul Barrett"
<<a
href="/group/xAP_developer/post?postID=VsWBzPGRL3ovKBwHV1wSllbUu5mAqX_2UrXazC0QRdNEtr7EFqqy6COZ7ZmVCdYf3z-28_thvyskEi89qHF2gC5-Eg">pbarrett@r...</a>>
wrote:

>Stuart is there a way within your framework to determine if a message
was
>previously received from the serial interface and therfore not
retransmit
>it.

I believe you need to increment the hop count as it traverses the
bridge. From the spec:

66
Hop Count hop=<hop-count>.
Always has value of "1" set by the originator. This value will be
incremented each time a message traverses a bridge or gateway (but not
when it traverses a hub).
E.g. hop=1.

:

Bridging

xAP is, so far is as practicable, network agnostic. Where two networks
are to be joined, so that xAP messages can be passed between then, a
software bridge is used. The bridge understands the implementation
details of the xAP protocol on each physical network, and performs the
necessary protocol conversions to pass the message from one network to
another.

In some cases, the bridge may provide a configuration interface to
allow traffic in one or both directions to be restricted.

A proposal has been made to permit messages to be flagged
"non-routable" in the xAP-Header, and for bridges to never pass
these
messages. Currently this item is still open.

Messages passed over the bridge always have the xAP-header hop count
increased. A bridge may be configured to discard messages with
hop-count > n to prevent looping/broadcast storms.
99

Sorry, bit brief, busy right now. Haven't used this one before myself.

S
--
Stuart Booth <<a
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