Filter
Top Products
Configuring LAN Interfaces
Configuring a Hub Interface
IC-46
Cisco IOS Interface Configuration Guide
To enable the link test function on a hub port connected to an Ethernet interface, use the following
command in hub configuration mode:
Enabling Source Address Control
On an Ethernet hub port only, you can configure a security measure such that the port accepts packets
only from a specific MAC address. For example, suppose your workstation is connected to port 3 on a
hub, and source address control is enabled on port 3. Your workstation has access to the network because
the hub accepts any packet from port 3 with your workstation’s MAC address. Any packets arriving with
a different MAC address cause the port to be disabled. The port is enabled again after 1 minute and the
MAC address of incoming packets is checked again.
To enable source address control on a per-port basis, use the following command in hub configuration
mode:
If you omit the optional MAC address, the hub remembers the first MAC address it receives on the
selected port, and allows only packets from the learned MAC address.
See the examples of establishing source address control in the “Hub Configuration Examples” section.
Enabling SNMP Illegal Address Trap
To enable the router to issue an SNMP trap when an illegal MAC address is detected on an Ethernet hub
port, use the following commands in hub configuration mode:
You may need to set up a host receiver for this trap type (snmp-server host) for a Network Management
System (NMS) to receive this trap type. The default is no trap. For an example of configuring a SNMP
trap for an Ethernet hub port, see the “Hub Configuration Examples” section.
Command Purpose
link-test
Enables the link test function.
Command Purpose
source-address [mac-address]
Enables source address control.
Command Purpose
Step 1
hub ethernet number port [end-port]
Specifies the hub number and the hub port (or range of hub ports) and
enters hub configuration mode.
Step 2
snmp trap illegal-address
Enables the router to issue an SNMP trap when an illegal MAC address
is detected on the hub port.