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Configuration Tasks
Verifying Inline Power Configuration
Use the show power inline interface configured command to verifies the change by displaying the
Step 1
setting as configured:
Router# show power inline interface configured
Enabling Switch Port Analyzer
You can monitor traffic on a given port by forwarding incoming and outgoing traffic on the port to
another port in the same VLAN. A Switch Port Analyzer (SPAN) port cannot monitor ports in a different
VLAN, and a SPAN port must be a static-access port. Any number of ports can be defined as SPAN ports,
and any combination of ports can be monitored. SPAN is supported for up to 2 sessions.
To enable SPAN, use the following commands beginning in privileged EXEC mode:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# monitor session session-id
{destination | source} {interface | vlan
interface-id | vlan-id}} [, | - | both | tx | rx]
Step 3
Router(config)# end
To disable SPAN, use the following commands beginning in privileged EXEC mode:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# no monitor session session-id
Step 3
Router(config)# end
Managing the ARP Table
To communicate with a device (on Ethernet, for example), the software first must determine the 48-bit
MAC or local data link address of that device. The process of determining the local data link address
from an IP address is called address resolution.
The Address Resolution Protocol (ARP) associates a host IP address with the corresponding media or
MAC addresses and VLAN ID. Taking an IP address as input, ARP determines the associated MAC
address. Once a MAC address is determined, the IP-MAC address association is stored in an ARP cache
for rapid retrieval. Then the IP datagram is encapsulated in a link-layer frame and sent over the network.
Encapsulation of IP datagrams and ARP requests and replies on IEEE 802 networks other than Ethernet
is specified by the Subnetwork Access Protocol (SNAP). By default, standard Ethernet-style ARP
encapsulation (represented by the arpa keyword) is enabled on the IP interface.
When you manually add entries to the ARP Table by using the CLI, you must be aware that these entries
do not age and must be manually removed.
Cisco IOS Release 12.2(2)XT, 12.2(8)T, and 12.2(15)ZJ
114
16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series
Purpose
Enters global configuration mode.
Enables port monitoring for a specific session ("number").
Optionally, supply a SPAN destination interface, and a
source interface.
Returns to privileged EXEC mode.
Purpose
Enters global configuration mode.
Disables port monitoring for a specific session.
Returns to privileged EXEC mode.
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