qr code c# sample IOS(config)# interface type [slot_#/]port_# IOS(config-if)# [no] cdp enable in Objective-C

Encoding QR Code JIS X 0510 in Objective-C IOS(config)# interface type [slot_#/]port_# IOS(config-if)# [no] cdp enable

IOS(config)# interface type [slot_#/]port_# IOS(config-if)# [no] cdp enable
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Since CDP doesn t use many resources by the IOS (a small frame is generated once a minute), it is recommended that you keep it enabled unless your router is connected to the Internet or untrusted devices; then you should at least disable CDP on these interfaces At a minimum, the information is only 80 bytes in length Other, optional commands are related to CDP, such as changing the update and hold-down timers, but these commands are beyond the scope of this book
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To see the status of CDP on your Cisco device, use this command:
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IOS# show cdp Global CDP information: Sending CDP packets every 60 seconds Sending a holdtime value of 180 seconds Sending CDPv2 advertisements is enabled
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As you can see from this output, CDP is enabled and generating updates every 60 seconds The hold-down timer is 180 seconds This timer determines how long a
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CDP neighbor s information is kept in the local CDP table without seeing a CDP update from that neighbor These are the default timers for CDP You can also see the CDP configuration on an interface-by-interface basis by adding the interface parameter to the show cdp command:
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Router# show cdp interface Serial0 is up, line protocol is up, encapsulation is HDLC Sending CDP packets every 60 seconds Holdtime is 180 seconds Ethernet0 is up, line protocol is up, encapsulation is ARPA Sending CDP packets every 60 seconds Holdtime is 180 seconds
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To see a summarized list of the CDP neighbors to which your Cisco device is connected, use the show cdp neighbors command:
IOS# show cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r Repeater Device ID Router-A Local Intrfce Eth 0/0 Holdtme 176 Capability R Platform 2621 Port ID Fas 0/1
In this example, one device is connected with a device ID of Router-A, which is a 2621 router If you see a MAC address for the device ID, this indicates that the connected Cisco device wasn t assigned a name with the hostname command This update was received on ethernet0/0 on this device 4 seconds ago (holddown timer of 176 seconds subtracted from the hold-down time of 180 seconds) The Port ID refers to the port at the remote side from which the device advertised the CDP message You can add the optional detail parameter to the preceding command to see the details concerning the connected Cisco device You can also use the show cdp entry * command Here is an example of a CDP detailed listing:
Router# show cdp neighbor detail ------------------------Device ID: Router-A Entry address(es): IP address: 19216811
17: IOS Device Management
Platform: cisco 2621, Capabilities: Router Interface: Ethernet0/0, Port ID (outgoing port): FastEthernet0/1 Holdtime : 127 sec Version : Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 122(15)T9, RELEASE SOFTWARE (fc2) TAC Support: http://wwwciscocom/tac Copyright (c) 1986-2003 by cisco Systems, Inc Compiled Sat 01-Nov-03 04:43 by ccai advertisement version: 2 Duplex: half
In this example, you can see that the connected device is a 2621 series router running IOS 122(15)T9 and has an IP address of 19216811 configured on the connected interface To list the details of a specific neighbor, use this command:
Router# show cdp entry neighbor's_name
The advantage of this approach over that in the preceding example is this command lists only the specified neighbor s information
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1709The CD contains a multimedia demonstration of using CDP on a router IOS devices support one additional CDP command, which allows you to view CDP traffic statistics:
IOS# show cdp traffic Total packets output: 350, Input: 223 Hdr syntax: 0, Chksum error: 0, Encaps failed: 0 No memory: 0, Invalid: 0, Fragmented: 0
If you are receiving CDP traffic (Input parameter is incrementing with each execution of the command every minute), then the data link layer is functioning correctly
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