76
C
HAPTER
4: C
ONFIGURING
P
ATH
B
UILDER
S330/S310 M
ODULES
, P
ORTS
,
AND
A
PPLICATIONS
the buffer reaches the
Congestion On
threshold, the congestion filter is on. When
the buffer falls below the
Congestion Off
threshold, the congestion filter is off.
For example, if you set
Congestion On
to
75%
and
Congestion Off
to
50%
, the
congestion filter is on when the buffer is 75% full and is off when the buffer
drops below 50% full.
See “Setting Congestion Thresholds” below for further details about congestion
thresholds.
CAUTION:
You should enable early packet discard for AAL5 traffic only.
8
Select
[4] Previous
Menu to return to the CTX Buffers menu.
9
Press [Esc] to return to the CTX menu.
10
Select
[3] Apply CTX Buffer Changes
to apply your settings.
CAUTION:
This operation will affect traffic momentarily.
Setting Congestion Thresholds
For every connection where early packet discard is enabled, a status is kept when
there is a partial packet for that connection in the queue. Once the queue cell level
exceeds the
Congestion On
thresholds, only connections with partial packets
already existing in the queue are allowed in. Cells from other connections are
dropped. Once the congestion has subsided to the
Congestion Off
level, then all
remaining connections are allowed.
Set the
Congestion On
threshold based on the maximum packet size expected and
the number of active connections sending packets at a particular instant based on
a probability model.
Set the
Congestion On
level to allow some hysteresis in the operation.
Configuring Ports
The PathBuilder S330/S310 ports each have an administrative and an operational
status. To set up a virtual circuit, you must first set the administrative status of the
port which will carry the circuit online to In Service. You can also configure other
parameters, depending on the type of port.
When you set the administrative status to
Out of Service
, the operational status is
set to
Out of Service
whether or not the port is actually operational or not. Once
you set the administrative status to
In Service
(online), the operational status will
indicate the true port status (
Out of Service
if there is a port failure, or
In Service
if
not).
The following sections tell you how to configure specific ports on the PathBuilder
S330/S310 switch.
