HP A5120 EI Series Configuration Guide

3
To do…
Use the command…
Remarks
Set the interface speed
speed { 10 | 100 | 1000 | auto }
Optional
The optical port of an SFP port does
not support the 10 and 100
keywords.
By default, the auto option is
enabled.
Shut down the Ethernet
interface
shutdown
Optional
By default, an Ethernet interface is in
the up state.
To bring up an Ethernet interface,
use the undo shutdown command.
Setting speed options for auto negotiation on an Ethernet
interface
NOTE:
Optical interfaces do not support this feature.
As shown in Figure 1, speed auto negotiation enables an Ethernet interface to negotiate with its peer for
the highest speed that both ends support by default. You can narrow down the speed option list for
negotiation.
Figure 1 Speed auto negotiation application scenario
IP network
Server 1 Server 3Server 2
( Speed 1000 Mbps )
( Speed 1000 Mbps )
GE1/0/1
GE1/0/2
GE1/0/3
GE1/0/4
( Speed 1000 Mbps )
All interfaces on the switch are operating in speed auto negotiation mode, with the highest speed of
1000 Mbps. If the transmission rate of each server in the server cluster is 1000 Mbps, their total
transmission rate will exceed the capability of interface GigabitEthernet 1/0/4, the interface providing
access to the Internet for the servers.
To avoid congestion on GigabitEthernet 1/0/4, set 100 Mbps as the only speed option available for
negotiation on interface GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3. As
a result, the transmission rate on each interface connected to a server is limited to 100 Mbps.
Follow these steps to configure an auto-negotiation transmission rate:

HP A5120 EI Series Specifications

General

Uplink Ports	4 x SFP
Stacking	No
Management	CLI, Web, SNMP
Routing Protocols	RIP, OSPF
Power Supply	AC
MAC Address Table Size	16K
Dimensions	440 x 430 x 44 mm
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% non-condensing
Model	HP A5120-24G EI Switch (JG234A)
VLANs	4094