RX stats on CLP bit are fairly meaningless in reality. The place that
you are really interested in the stats is on the port on the carrier's
switch that faces the far end of the network. It is that port on the
carrier's switch that will normally set the CLP bit on traffic exceeding
SCR. If you have a car service then there won't be any. If you are
running any type of bursty traffic, and in a data world one might assume
that you are then you will expect to receive cells with CLP set as you
burst above SCR into PCR region.
If the network is congested it may drop cells with CLP set, normally
only when the SCT (severe congestion threshold) either for one of the
ports or one of the switches as a whole has been exceeded. You will
normally find out well before the network is severely congested because
you will rx cells with EFCI bit set (Explicit Forward Congestion
Indication, middle bit in the PTI on user cells, it has basically the
same function as FECN in Frame Relay) when the traffic reaches the MCT
(mild congestion threshold, typically 50% of port / switch capacity).
If you really want to find out what is happening you can either put an
ATM protocol analyser across the bearer at your end or replace the
router with an ATM test set (such as a TTC750, a Fluke or an HP)
In article , Cisco Newbie
writes
>Hi Groupstudy,
>
>Like to check is there any command in Cisco IOS that allows me to check
>whether the cell I received has the Congestion Loss Priority (CLP) bit set?
>
>If not how could I find out whether the cells is eligible to be discard
when
>there is a congestion....Thru' Telco?
>
Set up a load test from the far end and wind up the load until you
receive no more increase in throughput. The network will now be
discarding all excess traffic. This should correspond to what you are
paying for in the PCR of the virtual channel / virtual path.
>
>Definition of CLP: Congestion Loss Priority (CLP)---Indicates whether the
>cell should be discarded if it encounters extreme congestion as it moves
>through the network. If the CLP bit equals 1, the cell should be discarded
>in preference to cells with the CLP bit equal to zero.
>
>
>Thanx....
>_________________________________________________________________________
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Hope that helps
Peter
--
Peter Whittle
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=4336&t=3959
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