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38 CHAPTER 2: PORT CONFIGURATION
Setting Flow Control for Ethernet Port
If congestion occurs in the local switch after enabling flow control in both the local
and the peer switch, then the switch will inform its peer to pause sending packets.
Once the peer switch receives this message, it will pause packet sending, and vice
versa. In this way, packet loss is effectively reduced. The flow control function of
the Ethernet port can be enabled or disabled through the following command.
Perform the following configuration in Ethernet port view.
By default, Ethernet port flow control is disabled.
Permitting/Forbidding Jumbo Frames on the Ethernet port
Using the jumbo frame enable command, you can allow jumbo frames (1523 to
to 9216 bytes) to pass through the specified Ethernet port. Note that packets up
to 1522 bytes, including the IEEE 802.1Q tagging are always allowed to pass
through Ethernet ports.
Jumbo frames are only allowed for Ethernet Type II frames. Most network
equipment, including NICs, switches, and routers are not capable of supporting
jumbo frames and will always discard these packets.
Perform the following configuration in Ethernet port view.
By default, jumbo frames are disabled.
Setting Ethernet Port Broadcast Suppression Ratio
You can use the following commands to restrict the broadcast traffic. Once the
broadcast traffic exceeds the value set by the user, the system maintains an
appropriate broadcast packet ratio by discarding the overflow traffic. This is done
to suppress broadcast storm, avoid suggestion, and ensure the normal service.
The parameter is taken the maximum wire speed ratio of the broadcast traffic
allowed on the port. The smaller the ratio is, the less broadcast traffic is allowed. If
the ratio is 100%, do not perform broadcast storm suppression on the port.
Table 31 Set Flow Control for Ethernet Port
Operation Command
Enable Ethernet port flow control flow-control
Disable Ethernet port flow control undo flow-control
Table 32 Permitting/Forbidding Jumbo Frame to Pass Through the Ethernet Port
Operation Command
Permit jumbo frame to pass through the
Ethernet port.
jumboframe enable [
jumboframe_value ]
Forbid jumbo frame to pass through the
Ethernet port.
undo jumboframe enable