Cisco Systems RJ-45-to-AUX manual Port Configuration, Cisco Group Management Protocol, 289

Enter Selection:

The following list shows the commands from the CDP Configuration/Status menu:

∙[H] Hold Time (secs)—Indicates how long a CDP multicast will remain in the CDP table. The valid entries are from 5 to 255 seconds, and the default is 180 seconds.

∙[T] Transmission Interval (secs)—Defines the interval in which the switch will send CDP multicast messages.

∙[E] Enable CDP on Port(s)—Identifies one or more ports on which to enable CDP. You can use the All setting to enable all ports, or you can identify blocks of ports by using a hyphen. For example, to identify ports 1 through 10, enter “1−10”. You can use spaces to separate the variables; so, if you also want ports 12−15, enter “1−10 12−15”.

∙[D] Disable CDP on Port(s)—Identifies one or more ports on which to disable CDP.

∙[S] Show Neighbor—Displays a list of neighboring Cisco devices together with their device ID, MAC address, port, capabilities, and device platform. The device’s capabilities are indicated by letters: R indicates a router, T indicates a Trans Bridge, B indicates a Route Bridge, S indicates a switch, P indicates a repeater, H indicates a host, and I indicates IGMP.

∙[X] Exit to previous menu—Returns you to the Network Management menu.

[G]Cisco Group Management Protocol

You configure Cisco Group Management protocol (CGMP) by selecting G (the last configuration option) on the Network Management menu. In order to function properly, CGMP needs all the ports on the switch to reside in the same VLAN. CGMP allows an intelligent means of limiting multicast flooding to specific ports.

The following shows the menu on a Catalyst 2820 when the G command is chosen from the Network Management menu:

Catalyst 2820 − Cisco Group Management Protocol (CGMP) Configuration

————————————————————Settings——————————————————————

[H]	Router hold time (secs)		300
[C]	CGMP	Enabled

——————————Actions—————————————————————————————————

[L]List IP multicast addresses

[X]Return to previous menu

The following list shows the commands and descriptions for the CGMP Configuration menu:

∙[H] Router hold time (secs)—Indicates the amount of time the switch will keep CGMP multicast information. When the CGMP router fails or the power is recycled, the switch will flood multicast broadcasts out all the ports. The valid range is from 5 to 900 seconds; the default is 5 seconds.

∙[C] CGMP—Enables or disables CGMP on the switch. There are two valid options: E (enabled) and D (disabled; the default).

∙[L] List IP multicast addresses—Lists all multicast addresses learned by CGMP along with the VLAN, source MAC address, and port of the source address.

∙[X] Return to previous menu—Returns you to the Network Management menu.

[P]Port Configuration

From the Main Menu, you can configure each port’s settings from the Port Configuration menu. You must specify a port from Table 15.1.

Table 15.1: The available configurable ports on a Catalyst 2820 from the Port Configuration menu.

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