Cisco IOS naming rules

The Cisco IOS naming convention is composed of three parts: the Cisco IOS binary file name. PPPPP = platform FFFF = feature MM = runtime memory and compression format. The following figure shows the topic: PPPPP is the platform identifier, which indicates that the ffff of the Cisco7200 series router is a feature of IOS (see the feature set of Cisco IOS ), for example, a in the c7200-ajs56-mz represents the Advanced Peer-to-Peer Networking (APPN) feature, j Represents the enterprise feature, s represents the additional features (such as NAT, ISL, L2F, VPDN ), 56 indicates 56-bit encryption. MM consists of 2 characters. The first character indicates the memory space of IOS during runtime, and the second character indicates the compression mode. Location of Cisco IOS running: FImage runs in Flashm Image runs in RAMRImage runs in ROMLImage will be relocated at run timeCisco IOS Image compression identifier: ZZip compression x Mzip compression w "Stac" compression Cisco IOS software naming rules Brief Introduction: AAAAA-BBBB-CC-DDDD.EE 1. AAAAA is the hardware platform applicable to the description file. this group of BBBB characters describes the features contained in this IOS, 3. the CC character set is in the IOS file format. DDDD indicates the IOS software version, 5. EE is the suffix of the IOS file. I. Character groups of the "AAAAA" hardware platform, for example: (here we will not list them one by one, only a few representative) c2600 2600 series routers c2800 2800 series routers c54sm Catalyst 5000 RSM/VIP ics7700 ICS7700 mc3810 MC3810 Multi-Service Access Hub regen 15104 optical connection system rpm MGX 8850 RPM rsp 7500 series routers vbr 7200 UBR7200 universal broadband vg200 VG200 Voice Gateway. 2. "BBBB" indicates the character string. We usually see a Advanced Peer-to-Peer Networking (APPN) feature boot image j enterprise I IP ipbase IP BASE i3 simplified IP, no BGP, EBP, NHRP i5 IP address with VoFR k8 IPSec 56 k9 IPSec 3DES o IOS Firewall o3 in the intrusion detection system IDS, SSH firewall p + s (NAT, IBM, VPDN, VoIP) v VIP v5 VoIP x3 56-bit voice encryption 3. The first "C" in the "CC" format character group specifies the router memory type in which the image is executed. F flash, memory m RAM r ROM l runtime positioning if you want to remove the flash card (flash card) from a vro, then you can see what this character is. If it is f, the software is executed directly from the flash memory. In this case, Flash is required to be installed so that the IOS software can run. If it is m, the router has read IOS software from Flash memory, and is running it from RAM after compression. After the router is properly guided, Flash can be safely removed. The second "C" describes how to compress the z zip compression x mzip compression w stac compression IV. "DDDD" version description character groups indicate IOS software version 5 and ". EE "file name also has a suffix such as: .bin20..tar example:" rsp-jo3sv-mz.122-1.bin ", rsp is a hardware platform (Cisco 7500 series ). Jo3sv is an enterprise-level (j) firewall with IDS (o3), an IP enhancement (s) with NAT/VoIP, and a universal interface processor VIP (v ). Mz indicates that it is running in the RAM memory of the vro and is compressed by zip. 122-1 indicates that it is the first maintenance version of cisco ios software version 12 (2) 1, that is, the main version 12 (2.. Bin is the suffix of the IOS software.