Hi Keith,
I'm not an expert on RSVP but I'll give this a shot...
The reservation of bandwidth using RSVP simply prioritizes RSVP traffic of
a given flow over all other incoming traffic (note that one RSVP flow can
be prioritized over another RSVP flow). Thus, the RSVP traffic will always
be routed before non-RSVP traffic. This has the effect of reserving
bandwidth for RSVP traffic.
Now, what happens if there isn't any incoming traffic on a given RSVP flow
(i.e. your silence suppression example)? In the case of an extended gap
between RSVP flow packets, non-RSVP packets could slip in and get routed
due to the lack of priority traffic. Thus, the bandwidth is available to
other traffic as along as there is no incoming RSVP traffic.
That said, keep in mind that an RSVP session (flow) on a router will
timeout if:
1) No RSVP packets in a flow have been received within a specified
amount of time
2) No PATH or RESV message has been sent to periodically refresh
the router's RSVP state machine
When a timeout occurs (timeout intervals are specified in the PATH
message), the router stops giving priority to RSVP traffic thereby
releasing the bandwidth reservation. This is why it is unlikely that you
would see a large number of non-RSVP packets being routed between two RSVP
packets of the same flow (the session would probably timeout before this
could occur).
Hope this helps...
-Marcus
At 04:16 PM 07/26/2000 +0100, keith wood wrote:
>I am currently reading throught the CVoice notes and have just passed the
>section on RSVP. You can reserve bandwidth with this protocol to give to
>active voice channels for the duration of the call - this much I understand,
>no problem.
>
>What isn't clear in the notes is whether or not the bandwidth is available
>to other traffic if the voice traffic is not using it all - ie: during
>silence suppressed moments.
>
>Anybody know..?
>
>Thanks.
>
>
>
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=====================================
Marcus A. Walton
Lucent Technologies, Inc.
NetworkCare Professional Services Division
"The Knowledge Behind the Network"
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