3Com Switch 7700 Configuration Manual page 39

If the count parameter is set to 0, the port is not permitted to learn MAC address.
By default, there is no limit to the amount of the MAC addresses that an Ethernet
port can learn. However the number of MAC addresses a port can learn is still
restricted by the size of the MAC address table.
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.
Perform the following configuration in Ethernet port view.
Table 10 Setting Ethernet Port Broadcast Suppression Ratio
Operation
Set Ethernet port broadcast suppression ratio
Restore the default Ethernet port broadcast
suppression ratio
By default, 100% broadcast traffic is allowed to pass through, that is, no
broadcast suppression will be performed.
Note that in the Switch 7700, you can only use the command at the port on a
20-port 10/100/1000BASE-T Gigabit Ethernet card or a 20-port 1000BASE-X
Gigabit Ethernet card.
Setting the Link Type for an Ethernet Port
An Ethernet port can operate in three different link types, access, hybrid, and
trunk types. The access port carries one VLAN only and is used for connecting to
the user's computer.
The trunk port can belong to more than one VLAN and receive/send the packets
on multiple VLANs. The hybrid port can also carry more than one VLAN and
receive/send the packets on multiple VLANs. The difference between the hybrid
port and the trunk port is that the hybrid port allows the packets from multiple
VLANs to be sent without tags, but, the trunk port only allows the packets from
the default VLAN to be sent without tags.
Perform the following configuration in Ethernet port view.
Table 11 Set Link Type for Ethernet Port
Operation
Set the port to access port
Set the port to hybrid port
Set the port to trunk port
Restore the default link type, that is, the
access port.
Ethernet Port Overview
Command
broadcast-suppression pct
undo broadcast-suppression
Command
port link-type access
port link-type hybrid
port link-type trunk
undo port link-type
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