3Com Switch 4210 9-Port, Configuration Manual

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98 C
HAPTER
9: P
ORT
B
ASIC
C
ONFIGURATION
n
■
Only ports on the front panel of the device support the auto-negotiation speed
configuration feature. And ports on the extended interface card 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.
Limiting Traffic on
individual Ports
By performing the following configurations, you can limit the incoming
broadcast/multicast/unknown unicast 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.
Enabling Flow Control
on a Port
Flow control is enabled on both the local and peer switches. If congestion occurs
on the local switch:
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 57 Configure auto-negotiation speeds for a port
Operation Command Remarks
Table 58 Limit traffic on port
Operation Command Remarks
Enter system view system-view -
Limit broadcast traffic
received on each port broadcast-suppression ratio Optional
By default, the switch does
not suppress broadcast traffic.
Enter Ethernet port view interface interface-type
interface-number
-
Limit broadcast traffic
received on the current port broadcast-suppression {
ratio | bps max-bps }
Optional
By default, the switch does
not suppress broadcast traffic.
Limit unknown multicast and
unknown unicast traffic
received on the current port multicast-suppression {
ratio | bps max-bps }
Optional
The switch will suppress the
unknown multicast and
unknown unicast traffic
simultaneously after the
configuration.
By default, the switch does
not suppress unknown
multicast and unknown
unicast traffic.