Alcatel Carrier Internetworking Solutions Omni Switch/Router User Manual
Page 925
Obtaining Status and Statistical Information
Page 29-53
FECN Bit
This value indicates the total number of frames received from the network indicating forward
congestion. This occurs when the Frame Relay network sets the frame’s Forward Discard
Eligibility (
FECN
) flag. These frames experienced congestion coming over the virtual circuit.
Statistics are given only for Frames In for
FECN
Bit since the Frame Relay network sets it. See
Notification By FECN on page 29-12 for more information on the
FECN
bit.
BECN Bit
This value indicates the number of frames received from the network indicating backward
congestion. This occurs when the Frame Relay network sets a frame’s Backward Discard Eligi-
bility (
BECN
) flag. These frames observed congestion occurring in the opposite direction
during their path over the virtual circuit. Statistics are given only for Frames In since the
Frame Relay network sets the
BECN
bit. See Notification By BECN on page 29-11 for more
information on the BECN bit.
Discarded
The number of inbound frames that were dropped due to format errors or because the VC
was inactive.
Compressed Frames
Statistics in this column indicate traffic for compressed frames on this virtual circuit.
Compressed frames are only sent if both sides of a Frame Relay link successfully negotiate for
compression (i.e., both must support compression).
Compressed Octets
Statistics in this column indicate traffic for compressed octets on this virtual circuit.
Compressed frames are only sent and received if both sides of a Frame Relay link success-
fully negotiate for compression (i.e., both must support compression). Statistics for octets
include the data, Frame Relay header, and Data Compression header fields, but they do not
include CRC or flag characters.
Uncompressed Octets
Statistics in this column indicate traffic for uncompressed octets on this virtual circuit. These
values apply to the compressed data before compression or just after decompression. Statis-
tics for octets include the uncompressed data and Frame Relay header fields, but they do not
include CRC or flag characters.
Compression Ratio
Statistics in this column indicate the compression that was achieved for this type of traffic. For
example, in the sample table Outgoing traffic had compression ration of
1.2:1
meaning that each compressed octet is 1.2 uncompressed octets.