3Com 4510G - Configuring an Auto-Negotiation Transmission Rate

1-5
Follow these steps to configure a manual port group:
To do… Use the command… Remarks
Enter system view system-view —
Create a manual port group and enter
manual port group view
port-group manual
port-group-name
Required
Add Ethernet interfaces to the manual
port group
group-member interface-list Required
Configuring an Auto-negotiation Transmission Rate
Usually, the transmission rate on an Ethernet port is determined through negotiation with the peer end,
which can be any rate within the capacity range. With auto-negotiation rate configured, you can enable
the Ethernet port to negotiate only part of the transmission rates within its capacity.
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 1/0/4, 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 1/0/1, GigabitEthernet 1/0/2 and
GigabitEthernet 1/0/3 through negotiation with the servers is 1000 Mbps, which may cause congestion
on the egress port GigabitEthernet 1/0/4. To solve the problem, you can specify the auto-negotiation
transmission rate on GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3 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