3com 3031 Instruccion De Instalación
Frame Relay QoS Configuration
993
Configuring Frame Relay
Congestion
Management
There are two ways to set the congestion threshold. One is to configure the
congestion threshold for a PVC in a specified Frame Relay class, another is to
configure the congestion threshold for the overall interface in interface view. The
router determines whether there is congestion on the interface according to the
ratio that the current queue length on the Frame Relay interface or PVC occupies
the total queue length on the interface. If the ratio is greater than the threshold
set by the user, the router will assume that there is congestion, and will process
the packets with the corresponding methods, such as discarding.
congestion threshold for a PVC in a specified Frame Relay class, another is to
configure the congestion threshold for the overall interface in interface view. The
router determines whether there is congestion on the interface according to the
ratio that the current queue length on the Frame Relay interface or PVC occupies
the total queue length on the interface. If the ratio is greater than the threshold
set by the user, the router will assume that there is congestion, and will process
the packets with the corresponding methods, such as discarding.
Frame Relay congestion management includes the congestion management on
the Frame Relay interface and the congestion management on the Frame Relay
PVC.
the Frame Relay interface and the congestion management on the Frame Relay
PVC.
Configuring the congestion management policy on a Frame Relay
interface
interface
Perform the following in the Synchronous Serial Interface View.
By default, this function is not enabled.
When the congestion management is enabled on a Frame Relay interface, the
queueing type on the interface can only be either FIFO or PVC PQ.
queueing type on the interface can only be either FIFO or PVC PQ.
Configuring the congestion management policy on Frame Relay PVC
Perform the following in the Frame Relay Class View.
Table 1075 Configuring the congestion management policy on a Frame Relay interface
Operation
Command
Enable a Frame Relay interface to discard the
packets that are marked with DE flag bit in the
case of congestion
packets that are marked with DE flag bit in the
case of congestion
fr congestion-threshold de
queue-percentage
Disable the Frame Relay interface to discard the
packets that are marked with DE flag bit in the
case of congestion
packets that are marked with DE flag bit in the
case of congestion
undo fr congestion-threshold de
Enable a Frame Relay interface to process the
BECN and FECN flag bits in the case of
congestion
BECN and FECN flag bits in the case of
congestion
fr congestion-threshold ecn
queue-percentage
Disable the Frame Relay interface to process the
BECN and FECN flag bits in the case of
congestion
BECN and FECN flag bits in the case of
congestion
undo fr congestion-threshold
ecn
Table 1076 Configuring the congestion management policy on a Frame Relay PVC
Operation
Command
Enable a Frame Relay PVC to discard
the packets that are marked with DE
flag bit in the case of congestion
the packets that are marked with DE
flag bit in the case of congestion
congestion-threshold dequeue-percentage
Disable the Frame Relay PVC to
discard the packets that are marked
with DE flag bit in the case of
congestion
discard the packets that are marked
with DE flag bit in the case of
congestion
undo congestion-threshold de
Enable the Frame Relay PVC to
process the BECN and FECN bits in
the case of congestion
process the BECN and FECN bits in
the case of congestion
congestion-threshold ecn
queue-percentage
Disable the Frame Relay PVC to
process the BECN and FECN bits in
the case of congestion
process the BECN and FECN bits in
the case of congestion
undo congestion-threshold ecn