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Hi
Dave K,
But
the draft says" provides the
Detection Time for the transmitting
system". Shouldn't this be changed to "provides the Detection Time for
the receiving
system"
Yours,
Shahram
DaveW misspoke slightly.
Your computation is correct.
There is no need for a poll sequence when the multiplier is changed because
the timing of the packet transmission doesn't change.
The poll sequence is needed to coordinate timing changes if the packet
transmission interval might change, as the detection time change needs to be
coordinated with the transmission rate change so that the session doesn't fail
by mistake.
--Dave
On Aug 19, 2009, at 11:28 AM, Shahram Davari wrote:
Hi
David,
I
thought Detection Multiplier is a parameter sent by a local system to a remote
system, so that the remote system can compute the Detection Interval Timer.
What do you mean by "Detection Multiplier is a Local matter"? If it is a local
matter then why is it communicated to the remote system?
I
think I am not clear on the definition of Detection Multiplier. The base draft
defines it as:
Detect Mult
"Detection time multiplier. The
negotiated transmit interval, multiplied
by this value, provides the Detection Time for the transmitting system in Asynchronous
mode."
May be
you could explain it in the following example:
A
------------------------------->B
A<--------------------------------B
BFD
packets send from A --> B:
Detect
Mult=A1, Desired Min Tx Interval = A2, Require Min RX Interval
=A3
BFD
packets send from B --> A:
Detect
Mult=B1, Desired Min Tx Interval = B2, Require Min RX Interval
=B3
The
Detection Window at B = A1 * Max (A2, B3)
The Detection Window at A = B1 * Max (B2,
A3)
Is this computation correct?
Thanks,
Shahram
Shahram -
6.8 and 10 clearly state that the rules of 6.8.3 apply. I don't believe
there is a need for more verbiage than exists.
6.8.12 is discussing a different attribute, the detect multiplier. It
clearly states that a poll sequence is not necessary. This should be obvious
as the detectmult is a local matter and doesn't affect anything on the remote
end.
You do need to use the poll sequence in all cases. Demand mode setting is
orthogonal.
-DWard
On Aug 18, 2009, at 9:30 PM, Shahram Davari wrote:
Hi,
There is a
discrepancy in the base draft regarding when any of the BFD parameter
changes. Section 6.8.10, 11 and 12 say that poll sequence is not required
when bfd.DesiredMinTxInterval or bfd.RequiredMinRxInterval are
changed, while section 6.8.3 says:
" If either bfd.DesiredMinTxInterval is changed or
bfd.RequiredMinRxInterval is changed, a Poll Sequence MUST be initiated (see
section 6.5)"
Which one is
correct? If not in demand mode is there any need to initiate Poll if any of
the local parameters change?
Thanks,
Shahram
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