Local-Area Networks and LAN Switching - CCIE Routing and Switching Exam Certification Guide - page 157

FEC Configuration
On a router, FEC is configured by assigning interfaces to a port-channel with the channel-
group number mode on command. The virtual interface is created with the interface port-
channel number command. Example 4-17 shows the FEC configuration of two FE interfaces
assigned to channel 1.

Example 4-17 FEC Configuration on a Router

ag1.hstttx.lab(config)#int fast 2/25
ag1.hstttx.lab(config-if)#channel-group ?
<1-256> Channel group number

ag1.hstttx.lab(config-if)#channel-group 1 mode on
Creating a port-channel interface Port-channel1
ag1.hstttx.lab(config-if)#int fast 2/26
ag1.hstttx.lab(config-if)#channel-group 1 mode on
ag1.hstttx.lab(config-if)#exit
ag1.hstttx.lab(config)#interface port-channel ?
<1-256> Port-channel interface number

channel-group 1 mode on

channel-group 1 mode on

ag1.hstttx.lab(config)#interface port-channel 1 interface port-channel 1

On the Catalyst switch, the configuration command is set port channel :

cat5000: (enable) set port channel ?
Usage: set port channel <port_list> [on|off|desirable|auto]
(example of port_list: 2/1-4 or 2/1-2 or 2/5,2/6)

CDP

CDP is a Cisco proprietary protocol that you use to obtain hardware platforms and addresses of
neighboring Cisco devices. CDP is media and protocol independent, and it runs over any Layer-
2 protocol that supports SNAP frames including Ethernet, Frame Relay, and ATM. CDP allows
network management stations to retrieve the device type and SNMP IP address of neighboring
routers.

CDP is enabled by default. To disable CDP, use the no cdp run global command. CDP can be
disabled per interface with the no cdp enable interface command. In Catalyst OS (CatOS), the
command to globally disable CDP is set cdp disable . In CatOS, to disable CDP on a port, use
the set cdp disable [ mod/port ] command.

The router output in Example 4-18 shows the information that can be gathered from show cdp .