Cisco IOS (originally Internetwork Operating System) is the software used on the vast majority of Cisco Systems routers and all current Cisco network switches. IOS is a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system. The first IOS was written by William Yeager.

Cisco IOS has a characteristic command line interface (CLI), whose style has been widely copied by other networking products. The IOS CLI provides a fixed set of multiple-word commands -- the set available is determined by the "mode" and the privilege level of the current user. "Global configuration mode" provides commands to change the system's configuration, and "interface configuration mode" provides commands to change the configuration of a specific interface. A typical command may be "show interface fa0/48" or "no ip cef traffic-statistics". All commands are assigned a privilege level, from 0 to 15, and can only be accessed by users with the necessary privilege. Through the CLI, the commands available to each privilege level can be defined.

Versioning

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Cisco IOS versions are versioned using three numbers and some letters, in the general form a.b(c.d)e, where

• a is the major version number of the release
• b is the minor version number
• c is the release number, which begins at one and increments as new releases in the same a.b train are released
• d (omitted from general releases) is the interim build number
• e (zero, one or two letters) is the release train identifier, such as none (which designates the mainline, see below), T (for Technology), E (for Enterprise), S (for Service provider), XA as a special functionality train, XB as a different special functionality train etc.

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how to upgrade a new ios in cisco 4500: by roycem (Posted Thu Nov 05, 2009 1:49 am)I want to upgrade the ios in.. http://bit.ly/47zK3h
networkingforum (Steve Spangle) Thu, 05 Nov 2009 07:02:32 -0000
how to upgrade a new ios in cisco 4500: by roycem (Posted Thu Nov 05, 2009 1:49 am)I want to upgrade the ios in.. http://bit.ly/47zK3h
CiscoはIOS確認が面倒だよなぁ。
soleprog (孤独のプログラマー) Thu, 05 Nov 2009 06:28:29 -0000
CiscoはIOS確認が面倒だよなぁ。
Finished introducing Cisco IOS routing tables to my class tonight. 3 router topology. Configured C then S and on to R ( with the S removed)
PMCOACH (Shawn Canady) Thu, 05 Nov 2009 04:16:46 -0000
Finished introducing Cisco IOS routing tables to my class tonight. 3 router topology. Configured C then S and on to R ( with the S removed)
cant get #OpenBSD #IOS & #JUNOS to talk rip to each other, http://bit.ly/2Pkp6E added ip rip initial-delay to #cisco conf, still no joy,
sevanjaniyan (Sevan Janiyan) Wed, 04 Nov 2009 20:23:44 -0000
cant get #OpenBSD #IOS & #JUNOS to talk rip to each other, http://bit.ly/2Pkp6E added ip rip initial-delay to #cisco conf, still no joy,
そういえば、昔、Ciscoの17系専用のカードでWIC-4ESWってのがあって、パケット数が一定量を超えると通信ができなくなると言うバグがあったな。大体酷使してて半年くらいで発病するんだけれども、検証で発見できなかった苦い思い出が・・つか無理。多分新しいIOSでは治ってるはず。
IZUMI162i6 (IZUMI162i6) Wed, 04 Nov 2009 17:30:59 -0000
そういえば、昔、Ciscoの17系専用のカードでWIC-4ESWってのがあって、パケット数が一定量を超えると通信ができなくなると言うバグがあったな。大体酷使してて半年くらいで発病するんだけれども、検証で発見できなかった苦い思い出が・・つか無理。多分新しいIOSでは治ってるはず。
#cisco DLSw in IOS?: Does the DLSw feature come pre-installed in current releases of IOS? Or does it need.. http://bit.ly/1TF9tr
cabling_one (Cabling Design) Wed, 04 Nov 2009 07:02:19 -0000
#cisco DLSw in IOS?: Does the DLSw feature come pre-installed in current releases of IOS? Or does it need.. http://bit.ly/1TF9tr

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