3Com S7906E - Switch, Configuration Manual

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1-7
Figure 1-1 An application diagram of auto-negotiation transmission rate
As shown in Figure 1-1, the network card transmission rate of the server group (Server 1, Server 2, and
Server 3) is 1000 Mbps, and the transmission rate of GigabitEthernet 2/0/4, which provides access to
the external network for the server group, is 1000 Mbps too. If you do not specify an auto-negotiation
range, the transmission rate on GigabitEthernet 2/0/1, GigabitEthernet 2/0/2 and GigabitEthernet 2/0/3
through negotiation with the servers is 1000 Mbps, which may cause congestion on the egress port
GigabitEthernet 2/0/4. To solve the problem, you can specify the auto-negotiation transmission rate on
GigabitEthernet 2/0/1, GigabitEthernet 2/0/2, and GigabitEthernet 2/0/3 to 100 Mbps.
Follow these steps to configure an auto-negotiation transmission rate:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the auto-negotiation
transmission rate range
speed auto [ 10 | 100 | 1000 ] * Optional
z
This function is available for auto-negotiation-capable 100 MB or Gigabit Layer-2 Ethernet
electrical ports only.
z
If you repeatedly use the speed and the speed auto commands to configure the transmission rate
on a port, only the latest configuration takes effect.
Configuring Storm Suppression
You can use the storm suppression function to limit the size of a particular type of traffic (currently
broadcast, multicast and unknown unicast traffic) on a per-port basis in Ethernet port view or port group
view.
In port or port group view, you set the maximum broadcast, multicast or unknown unicast traffic allowed
to pass through a port or each port in a port group. When the broadcast, multicast, or unknown unicast