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Cisco Ios advanced
1.
Advanced IOS Functions
v1.01 – Aaron Balchunas * * * All original material copyright © 2007 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com. 1 - Advanced IOS Functions - The Configuration Register The configuration register (config-register) is a hexadecimal value that controls various aspects of how a router boots, including: • Baud Rate • Boot Messages (enable/disable) • Break (disable/ignore) • Flash (read-only, read-write) • NVRAM (use startup-config/bypass startup-config) The default config-register is 0x2102. To view your router’s current config- register setting: Router# show version <snip> 32K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read ONLY) Configuration register is 0x2102 Common config-register settings include: Value Baud Rate Boots Into? Flash Startup-Config 0x2101 9600 IOS from ROM Read/Write Uses 0x2102 9600 IOS from Flash Read/Only Uses 0x2142 9600 IOS from Flash Read/Only Bypass Remember, 0x2102 is the default config-register value on Cisco routers. In order to upgrade the Cisco IOS, the config-register must be changed to 0x2101, so that the Flash memory becomes writeable. To change the config-register from the IOS: Router(config)# config-register 0x2142 This configuration change does not take affect until the next reboot. (Reference: http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml)
2.
Advanced IOS Functions
v1.01 – Aaron Balchunas * * * All original material copyright © 2007 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com. 2 Backing up and Restoring the Cisco IOS The Cisco IOS is stored in flash. Multiple IOS files can be loaded into flash, assuming there is enough free space. You can view available free space, and the name of any file(s) in flash, by typing: Router# show flash System flash directory: File Length Name/status 1 4467254 c2500-ik9s-mz.122-4 [4467254 bytes used, 12309962 available, 16777216 total] 16384K bytes of processor board System flash (Read/Write) To backup the IOS, a TFTP server is required. The TFTP server must have IP connectivity to the router. To backup the IOS file from the router’s flash to the TFTP server: Router# copy flash tftp You will be prompted for the following information: • Address of remote host (the TFTP server) • Source file name (the name of the file in flash) • Destination file name To load an IOS file from a TFTP server to the router’s flash: Router# copy tftp flash The process is nearly identical to copy a startup-configuration file to or from a router’s NVRAM: Router# copy startup tftp Router# copy tftp startup
3.
Advanced IOS Functions
v1.01 – Aaron Balchunas * * * All original material copyright © 2007 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com. 3 CDP (Cisco Discovery Protocol) CDP is a Cisco propriety protocol used to collect information about locally attached Cisco switches and routers. CDP is enabled by default on all IOS enabled routers and switches, and sends out updates every 60 seconds. CDP will provide the following information about directly connected neighbors: • Device ID – hostname of remote router/switch • Local Interface – interface that remote router/switch is directly connected to • Holdtime – amount of time before remote device information is purged from CDP table • Capability – Type of remote device (router, switch, host) • Platform – Model of remote device To view CDP timers and hold-down information: Router# show cdp To display neighbor information: Router# show cdp neighbors To display traffic statistics: Router# sh cdp traffic To display port and interface information: Router# sh cdp interface To disable CDP on an interface: Router(config-if)# no cdp enable To globally disable CDP: Router(config)# no cdp run
4.
Advanced IOS Functions
v1.01 – Aaron Balchunas * * * All original material copyright © 2007 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com. 4 Resolving Hostnames on Cisco IOS Devices There are two ways to resolve hostnames on Cisco devices: • Building a host table on each router • Pointing each router to a centralized DNS server To manually build a host table on a router: Router(config)# ip host Router1 172.16.1.1 Router(config)# ip host Router2 172.17.1.2 To view your host table: Router# show hosts To disable DNS lookups: Router(config)# no ip domain-lookup To point your router to a DNS server: Router(config)# ip name-server IPADDRESS To add a domain name to your router: Router(config)# ip domain-name CISCO.COM Telnet It is possible to telnet from a router into a remote device, using either the hostname or IP address of the remote device: Router# telnet Router2 Router# telnet 172.17.1.2 To exit a telnet session: Router2# exit To return to the router you telnetted from, without exiting the session: • Hold CTRL+SHIFT+6 and then release • Type the character x To view all open telnet sessions: Router# show sessions
5.
Advanced IOS Functions
v1.01 – Aaron Balchunas * * * All original material copyright © 2007 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com. 5 Privilege Levels IOS devices have a total of 16 privilege levels, numbered 0 through 15. User Exec mode is privilege level 1. Privileged Exec mode is privilege level 15. We can create a custom Privilege level, including the commands users are allowed to input at that mode: Router(config)# privilege exec all level 3 show interface Router(config)# privilege exec all level 3 show ip route Router(config)# privilege exec all level 3 show reload To then enter that privilege level from User Mode: Router> enable 3 Observing Performance Statistics on Cisco Routers To view the processor load on a Cisco Router: Router# show processes cpu
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