关于Cisco IOS的命名

关于Cisco IOS的命名 记得CCNA的教材里面应该有讲. 这两天在看cisco文档,里面有的东西是教材 里面没有提到的,现在做一下说明. 看看这个 IOS 文件:        c3725-entbase-mz.123-2.T1.bin    c3725     Platform               平台   

entbase   Feature set            特性集  

m         Memory location      记忆体位置 z         Compression format     压缩格式   

123        Train number           系列号  

   2         Maintenance releas     主版本号  

   T1         Train identifier        系列标志   

    例如: c2600-ipbase-mz.123-6e   这个IOS可看出是用于 2600系列路由器的12.3系列的IOS, 主版本号是6,重编译号是e. 特性集是ipbase.从RAM中运行,采用zip方式压缩.     另外还有的IOS 主版本号后面有一位小数,例如 12.2(3.1)     这种IOS很少,被称为Interim Build 临时编译版本,一般是Cisco的TAC提供的一个内部版本,用于解决一些遇到的一些特殊得问题,不保证稳定性的. 一般等有了新的IOS出来以后是需要做升级的.下面是cisco得原文: An interim build is software from an internal Cisco engineering build process that the Cisco Technical Assistance Center (TAC) gives customers to use on a temporary basis to address a specific issue. Customers who have an interim build installed on their network should contact TAC for assistance in replacing the interim build.    还有一类IOS是特殊发行版本,例如 12.2(2)XB 这样的名字.    对于这些特殊发行版本有时候命名并不是符合严格的命名规则. 对应标志的含义: X Y Varies, one time release Z A Aggregation/Access Server/Dial D xDSL H SDH/SONET J Aironet Wireless Networking M Mobile Wireless W ATM/LAN Switching/Layer 3 Switching

最后是关于记忆体位置和压缩格式的说明: f—The image runs from Flash memory. m—The image runs from RAM. r—The image runs from ROM. l—The image is relocatable. z—The image is zip compressed. x—The image is mzip compressed. cisco IOS版本的系列号并不是和普通软件一样 12.3 就一定比 12.2新 12.3 只是说明这个IOS是 12.3 系列而已.所以IOS的新旧只能在同一系列进行比较.目前主要有 12.4 , 12.3 , 12.2 , 12.1 ,12.0 这几个系列.Cisco IOS 除了命名以外还有一点,就是IOS的部署范围,包括 ED, LD, GD,DF四种: ED代表早期部署. GD代表一般部署. LD代表有限部署. DF代表召回. 一般来说建议使用 GD 的IOS. 下面是关于这四种部署范围 Cisco的解释:    ED stands for "Early Deployment." Early Deployment releases offer new feature, platform, or interface support. Most non-major releases contain ED releases.    GD stands for "General Deployment." A major release of Cisco IOS Software reaches the "General Deployment" milestone when Cisco feels it is suitable for deployment anywhere in customer networks where the features and functionality of the release are required. Criteria for reaching the "General Deployment" milestone are based on, but not limited to, customer feedback surveys from production and test networks using the releases, Customer Engineer bug reports, and reported field experience. Only major releases are candidates for the General Deployment milestone.     LD stands for "Limited Deployment." A major release of Cisco IOS Software is said to be in the "Limited Deployment" phase of its life cycle during the period between its first shipment and the GD milestone.     DF stands for "Deferred." DF releases are not available for downloading because of known defects. These should not be installed on your router.