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11: Cisco IOS Software
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The last line of this output is the configuration register value This value determines how the router will boot up, including how it will find its IOS and its configuration file The bootup process of the router is discussed in more depth in 16
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1114 The CD includes a multimedia demonstration of using the show version command on a Cisco router
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One common networking problem occurs when you enable an interface: it might not always come up In Ethernet, this could be caused by using the wrong cable type (crossover versus straight-through), a mismatch in the speed or duplex settings, or a bad cable This section will discuss how to diagnose these problems with the show interfaces command
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One of the most common commands that you will use on an IOS device is the show interfaces command This command allows you to see the status and configuration of your interfaces, as well as some statistical information Here is the syntax of this command:
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IOS> show interfaces [type [slot_#/]port_#]
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If you don t specify a specific interface, the IOS device displays all of its interfaces those enabled as well as those disabled Here is an example of the output of this command on a router:
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Router# show interfaces e0 Ethernet 0 is up, line protocol is up Hardware is MCI Ethernet, address is 00000c001234 (bia 00000c001234) Internet address is 17216162, subnet mask is 255255255252 MTU 1500 bytes, BW 10000 Kbit, DLY 100000 usec, rely 255/255, load 1/255 Encapsulation ARPA, loopback not set, keepalive set (10 sec) ARP type: ARPA, ARP Timeout 4:00:00 Last input 0:00:00, output 0:00:00, output hang never Last clearing of "show interface" counters 0:00:00 Output queue 0/40, 0 drops; input queue 0/75, 0 drops Five minute input rate 0 bits/sec, 0 packets/sec Five minute output rate 4000 bits/sec, 8 packets/sec
IOS Operation and Veri cation
2240375 packets input, 887359872 bytes, 0 no buffer Received 722137 broadcasts, 0 runts, 0 giants 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 10137586 packets output, 897215078 bytes, 0 underruns 4 output errors, 1037 collisions, 3 interface resets, 0 restarts
Troubleshooting Interface Problems
One of the first things that you want to examine in this display is the status of the interface: Ethernet0 is up, line protocol is up The first up refers to the status of the physical layer, and the second up refers to the status of the data link layer Here are the possible values for the physical layer status:
Up
The device is sensing a physical layer signal on the interface
Down
The device is not sensing a physical layer signal on the interface, a condition that can arise if the attached device is turned off, there is no cable attached, or you are using the wrong type of cable You used the shutdown command to disable the interface
Administratively down
Here are the possible values for the data link layer status:
Up
The data link layer is operational
Down
The data link layer is not operational, a condition that can be caused by missed keepalives on a serial link, no clocking, an incorrect encapsulation type, or a disabled physical layer
If the interface status is up and up, the interface is operational; if it is up and down, it signals a problem with the data link layer (layer 2); if it is down and down, there is a physical layer problem (layer 1) If it is administratively down and down, the interface was disabled with the shutdown command
The Hardware is refers to the physical (layer 1) properties of the interface and the Encapsulation refers to the data link (layer 2) properties of the interface If the hardware type for an interface says "LANCE", then the interface is a Fast Ethernet interface
11: Cisco IOS Software
The second line of output from the show interfaces command has the hardware interface type (in this example, it s an Ethernet controller) This is followed by the MAC address on the interface The third line has the IP address and subnet mask configured on the interface (you won t see this on a layer 2 switch s interface) The fourth line has the MTU Ethernet frame size as well as the routing protocol metrics (These metrics are discussed in depth in s 15, 19, 20, and 21, which discuss routing protocols) Notice the BW parameter in this line Referred to as the bandwidth of the link, this is used by some routing protocols, such as Open Shortest Path First (OSPF) and Enhanced Interior Gateway Routing Protocol (EIGRP), when making routing decisions For Ethernet, this is 10,000 Kbps The line after this refers to the layer 2 encapsulation (frame) type used; with Ethernet, this can be ARPA (used with TCP/IP), Subnetwork Access Protocol (SNAP), or SAP Table 11-5 explains some of the elements that you may see with the show interfaces command Note that depending on the kind of IOS device and type of interface, the output displayed in the show interfaces command may differ slightly
TABLE 11-5
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