Lucent Technologies CBX 500 - Page 231

Setting Logical Port FCP Attributes
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/056-13
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Threshold: Global
Discard
Enter the value for the Global Discard buffer threshold.
Global Discard. buffers enable you to reserve buffers for
cell discard.
The default value differs depending on the module you are
configuring.
Threshold: EFCI Enter the value for the (EFCI) threshold. You can configure
this threshold to allow for some margin before the Global
Discard buffer threshold is reached. This margin
compensates for some of the closed-loop, flow-control
delay in the network prior to discarding cells.
The default value differs depending on the module you are
configuring.
FCP Managed VC
Limit
(CBX 500 IMA and
CBX 3500 Enhanced
IMA modules only)
Enter the number of FCP-managed VCs supported for a
logical port on the IMA module.
The range of possible values is 64 - 16384 VCs (multiples
of 64), with the following defaults:
• The default value is 64 for logical ports created on an
IMA group with one IMA link configured.
• The default value is 128 for logical ports created on a
IMA group with multiple IMA links configured.
See the Switch Diagnostics User’s Guide for CBX 3500,
CBX 500, GX 550, and B-STDX 9000
for details about
viewing this and other ATM FCP attributes for ATM
logical ports.
FCP BP Threshold -
VBR
(CBX 500 IMA and
CBX 3500 Enhanced
IMA modules only)
Enter the value of the back-pressure (BP) threshold for
VBR-NRT traffic on the egress. You can configure the BP
Threshold for each logical port according to the ATM
service class (either VBR/ABR or UBR-NRT.) The FCP
subsystem intercepts traffic between the switch fabric and
the IMA base card. The system monitors each of the 84 T1
channels for its buffer congestion state. If a channel exceeds
the specified BP threshold value, a throttle mechanism is
activated to reduce the rates on all active circuits to the
fair-bandwidth value for the circuit.
The default value is 128 cells.
FCP BP Threshold -
UBR
(CBX 500 IMA and
CBX 3500 Enhanced
IMA modules only)
Enter the value of the BP threshold for UBR/ABR traffic on
the egress. See the FCP VBR BP Threshold description
above for a description of the purpose of the FCP BP
threshold parameter.
The default value is 128 cells.
Table 6-2. Add Logical Port: ATM FCP Tab Fields (Continued)
Field/Button Description