3Com SuperStack 4 Configuration Manual page 38

50 C 2: P O
HAPTER ORT PERATION
Setting the Cable Type for the Ethernet Port
Ethernet ports support straight-through and cross-over network cables. Use the
following command to configure the cable type.
Perform the following configuration in Ethernet Port View.
Table 35 Setting the Type of the Cable Connected to an Ethernet Port
Operation
Set the type of the cable connected to an Ethernet
port.
Restore the default type of the cable connected to an
Ethernet port.
By default, the cable type is auto (auto-recognized). That is, the system can
automatically recognize the type of cable connecting to the port.
Enabling/Disabling Flow Control for the Ethernet Port
After flow control is enabled in both the local and the peer Switch, if congestion
occurs in the local Switch, the Switch will inform its peer to pause packet sending.
In this way, packet loss is reduced. The flow control function of the Ethernet port
can be enabled or disabled using the following command.
Perform the following configuration in Ethernet Port View.
Table 36 Enabling/Disabling Flow Control for an Ethernet Port
Operation
Enable Ethernet port flow control
Disable Ethernet port flow control
By default, Ethernet port flow control is disabled.
Permitting/Forbidding Jumbo Frames to Pass through an Ethernet Port
An Ethernet port may encounter jumbo frames exceeding the standard frame
length, when switching large throughput data like transmitting files. This
command can forbid or permit jumbo frames to pass through an Ethernet port.
Perform the following configuration in Ethernet Port View.
Table 37 Permitting/Forbidding Jumbo Frame to Pass through the Ethernet Port
Operation
Permit jumbo frame to pass through the Ethernet port
Forbid jumbo frame to pass through the Ethernet port
By default, jumbo frames with lengths between 1518 bytes and 9216 bytes
inclusive are permitted to pass through an Ethernet port.
Setting the Ethernet Port Suppression Ratio
Use the following commands to restrict broadcast/multicast/unicast traffic. Once
traffic exceeds the value set by the user, the system will maintain an appropriate
packet ratio by discarding the overflow traffic, so as to suppress storm, avoid
congestion and ensure the normal service.
Command
mdi { across | auto | normal }
undo mdi
Command
flow-control
undo flow-control
Command
jumboframe enable
undo jumboframe enable