3Com Switch 7750 Configuration Guide

Ethernet Port Configuration 175
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■ Only ports on the front panel of the device support the auto-negotiation speed
configuration feature. And ports on the extended interface module do not
support this feature currently.
■ After you configure auto-negotiation speed(s) for a port, if you execute the
undo speed command or the speed auto command, the auto-negotiation
speed setting of the port restores to the default setting.
■ The effect of executing speed auto 10 100 1000 equals to that of executing
speed auto, that is, the port is configured to support all the auto-negotiation
speeds: 10 Mbps, 100 Mbps, and 1000 Mbps.
Configuring
Broadcast/Multicast/Unk
nown Unicast
Suppression
By performing the following configurations, you can limit different types of
incoming traffic on individual ports. When a type of incoming traffic exceeds the
threshold you set, the system drops the packets exceeding the traffic limit to
reduce the traffic ratio of this type to the reasonable range, so as to keep normal
network service.
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Type-A I/O Modules, including 3C16860, 3C16861, LS81FS24A, 3C16858, and
3C16859, do not support enabling broadcast/multicast/unknown unicast
suppression on ports.
Configure the available
auto-negotiation speed(s) for
the port
speed auto [ 10 | 100 |
1000 ]*
Optional
■ By default, the port speed
is determined through
auto-negotiation.
■ Use the 1000 keyword for
Gigabit Ethernet ports only
Table 108 Configure auto-negotiation speeds for a port
Operation Command Remarks
Table 109 Configure broadcast/multicast/unknown unicast suppression
Operation Command Description
Enter system view system-view -
Suppress broadcast traffic
received on all ports in the
current VLAN
broadcast-suppression { rati
o | pps pps }
Optional
By default, the switch does
not suppress broadcast traffic
Exit VLAN view quit -
Enter Ethernet port view interface interface-type
interface-number
-
Limit broadcast traffic
received on the current port
broadcast-suppression { rati
o | bandwidth bandwidth |
pps pps }
Optional
By default, the switch does
not suppress broadcast traffic.
Limit multicast traffic received
on the current port
multicast-suppression { rati
o | bandwidth { mbps-value |
kbps kbps-value } | pps
max-pps }
Optional
By default, the switch does
not suppress multicast traffic.
Limit unknown unicast traffic
received on the current port
unicast-suppression { ratio |
bandwidth { mbps-value |
kbps kbps-value } | pps
max-pps }
Optional
By default, the switch does
not suppress unknown
unicast traffic.