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07-09-2010 06:30 AM
Hi,
The following is copied from the command reference.
In LD mode, the value of
desired_distance is the upper limit of the link
distance and is used to calculate buffer availability for other ports in the
same port group. When the measured distance exceeds the value of
desired_distance
, this value is used to allocate the buffers. In this case, the
port operates in degraded mode instead of being disabled due to insufficient
buffers.
We have a dark fibre connection between two buildings with an optical length of 10.4 km.
When I configured both ports of the ISL with portcfglongdistance port LD 1 50, we are getting a measured link distance of 47 km and 206 BB credits are awarded to the port.
How is the measurement done? Are there any reasons why the measured value differ from the actual value?
I can think of devices or cables.
Regards, Bart
07-09-2010 08:13 AM
--->>> Are there any reasons why the measured value differ from the actual value?
what they mean whit: "measured value" .... "actual value"
07-10-2010 09:47 AM
check portbuffershow, it will show you like this:
HDFC_UAT5_FAB1:user> portbuffershow
User Port Lx Max/Resv Buffer Needed Link Remaining
Port Type Mode Buffers Usage Buffers Distance Buffers
---- ---- ---- ------- ------ ------- --------- ----------
0 E - 8 26 26 2km
1 E - 8 26 26 2km
2 E - 8 26 26 2km
3 E - 8 26 26 2km
4 - 8 0 - -
5 - 8 0 - -
6 - 8 0 - -
7 - 8 0 - -
8 F - 8 8 - -
9 F - 8 8 - -
10 F - 8 8 - -
11 F - 8 8 - -
12 - 8 0 - -
13 - 8 0 - -
14 - 8 0 - -
15 - 8 0 - - 220
=============================================================
Also check portcfgshow, portshow
pls find the pdf that may help you