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Recall from s 6 and 10 that ARP is used to resolve layer 3 IP addresses to layer 2 MAC addresses When a LAN device in a subnet needs to access resources beyond the subnet, it must forward its frames to the MAC address of the default gateway (router) and uses ARP for the resolution The router builds a local ARP table when it receives traffic on an interface, keeping track of the IP-to-MAC address mappings This can be viewed with the show arp or show ip arp command:
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IOS# show Protocol Internet Internet Internet ip arp Address Age (min) Hardware Addr 10062 - 00070e464070 1723062 - 00070e464071 1723067 0 005054807e01 Type ARPA ARPA ARPA Interface FastEthernet0/0 FastEthernet0/1 FastEthernet0/1
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A dash ( - ) in the (min) column means the address is local to the router; a time value indicates that the router learned the IP/MAC addressing mapping dynamically The last entry in this example was dynamically learned within the last minute If a particular MAC address isn t seen for a period of time, it is aged out of the ARP table Likewise, when a frame matches an existing entry in the table, its aging time is reset to zero in the table The Type column denotes the Ethernet
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encapsulation type (ARPA, SNAP, or SAP) used in the frame: TCP/IP uses ARPA for Ethernet The show ip arp command is important because if you see at least the router s own mappings in the table for its interfaces and entries are being learned and updated in the table, then you have layer 2 connectivity on those interfaces
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1708The CD includes a multimedia demonstration of examining an ARP table on a router
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CDP is a Cisco proprietary data link layer protocol that was made available in version 103 of the router IOS Many, but not all, Cisco devices support CDP, including Cisco routers and Catalyst switches For those devices that support CDP, CDP is enabled by default CDP messages received from one Cisco device, by default, are not forwarded to any other devices behind it In other words, you can see CDP information about only other Cisco devices directly connected to your device Most people misunderstand this, since CDP uses multicasts to disseminate its information You would think that a Cisco switch would flood this kind of traffic; however, CDP is an exception to the rule in a network of Cisco devices
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About CDP, you should know that if you are receiving CDP frames from a directly connected Cisco neighbor, then at least the data link layer
is functioning correctly CDP information is not propagated to other Cisco devices behind your directly connected neighboring Cisco devices
CDP Information
CDP, as mentioned, works at the data link layer However, since CDP uses a Subnetwork Access Protocol (SNAP) frame type, not every data link layer media type is supported The media types that are supported are Ethernet, Token Ring, fiber distributed data interface (FDDI), Point-to-Point Protocol (PPP), HighLevel Data Link Control (HDLC), Asynchronous Transfer Mode (ATM), and Frame Relay
17: IOS Device Management
The information shared in a CDP packet about a Cisco device includes the following:
Name of the device configured with the hostname command IOS software version Hardware capabilities, such as routing, switching, and/or bridging Hardware platform, such as 2800 or 2960 The layer 3 address(es) of the device The interface on which the CDP update was generated
CDP Configuration
As mentioned in the last section, CDP is enabled on all Cisco CDP capable devices when you receive your product from Cisco On Cisco routers and switches, you can globally disable or enable it with this command:
IOS(config)# [no] cdp run
You can also enable or disable CDP on an interface-by-interface basis:
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