Release Notes for Cisco IAD2801 Series Integrated Access Devices with Cisco IOS Release 12.4(20)YA
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Table Of Contents
Release Notes for Cisco IAD2801 Series Integrated Access Devices with Cisco IOS Release 12.4(20)YA
Determining the Software Release
Upgrading to a New Software Release
New Hardware Features in Cisco IOS Release 12.4(20)YA3
New Software Features in Cisco IOS Release 12.4(20)YA3
New Hardware Features in Cisco IOS Release 12.4(20)YA2
New Software Features in Cisco IOS Release 12.4(20)YA2
Fixed Configuration Platforms Supporting Specific Cards
Open Caveats - Cisco IOS Release 12.4(20)YA3
Resolved Caveats - Cisco IOS Release 12.4(20)YA3
Open Caveats - Cisco IOS Release 12.4(20)YA2
Resolved Caveats - Cisco IOS Release 12.4(20)YA2
Resolved Caveats - Cisco IOS Release 12.4(20)YA1
Cisco IOS Software Documentation Set
Release Notes for Cisco IAD2801 Series Integrated Access Devices with Cisco IOS Release 12.4(20)YA
First Released: January 16, 2008Last Revised: April 7, 2009Cisco IOS Release 12.4(20)YA3OL-18978-02 Second ReleaseThese release notes for the Cisco IAD2801 Series Integrated Access Devices describe the product-related enhancements provided in the Cisco IOS Release 12.4(20)YA. These release notes are updated as needed.
For a list of the applicable software caveats, see the "Caveats" section. See also Caveats for Cisco IOS Release 12.4(20)T, which is updated for every maintenance release.
Use these release notes with the Cross-Platform Release Notes for Cisco IOS Release 12.4T and About Cisco IOS Release Notes.
Contents
These release notes describe the following topics:
Introduction
The following Cisco IAD2801 models are supported:
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IAD2801-2BRI-A/K9- Fixed configuration router, with integrated PVDM2-8, HWIC-1ADSL, and 1 VIC2-2BRI-NT/TE-P, 2 Fast Ethernet connections, and 1 factory configurable HWIC slot
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The following cards are supported in the factory configurable HWIC slot on all models:
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For information on new features and Cisco IOS commands supported by Cisco IOS Release 12.4(20)YA, see the "New and Changed Information" section.
System Requirements
This section describes the system requirements for the Cisco IOS Release 12.4(20)YA releases and includes the following sections:
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Memory Requirements
Table 1 lists the memory requirements for the Cisco IOS feature sets on the Cisco IAD2801 in Cisco IOS Release 12.4(20)YA. The Cisco IAD2801 uses a 32-MB Flash memory card.
Hardware Supported
Cisco IOS Release 12.4(20)YA supports the Cisco IAD2801 series IADs.
For detailed descriptions of the new hardware features, see the "New and Changed Information" section.
For information about supported hardware for this platform and release, see the Hardware/Software Compatibility Matrix at:
http://www.cisco.com/cgi-bin/front.x/Support/HWSWmatrix/hwswmatrix.cgi
Determining the Software Release
To determine the version of Cisco IOS software currently running on your Cisco IAD2801 series router, see About Cisco IOS Release Notes located at http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4xy15/ReleaseNote.html.
Upgrading to a New Software Release
For general information about upgrading to a new software release, see About Cisco IOS Release Notes located at http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4xy15/ReleaseNote.html.
Feature Set Tables
For information about Feature Set Tables, see About Cisco IOS Release Notes located at http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4xy15/ReleaseNote.html.
New and Changed Information
The following sections list the new hardware products and software features supported by the Cisco IAD2801 in Cisco IOS Release 12.4(20)YA:
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New Hardware Features in Cisco IOS Release 12.4(20)YA3
There are no new hardware features in this release.
New Software Features in Cisco IOS Release 12.4(20)YA3
There are no new software features in this release.
New Hardware Features in Cisco IOS Release 12.4(20)YA2
There are no new hardware features in this release.
New Software Features in Cisco IOS Release 12.4(20)YA2
There are no new software features in this release.
Limitations and Restrictions
The following limitations and restrictions apply to the Cisco IAD 2801 series
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Fixed Configuration Platforms Supporting Specific Cards
The Cisco IAD2801 series are fixed configuration platforms with each slot supporting specific cards. Supported cards in each model are shown below:
Table 2 Supported Cards in Cisco IAD2801 Series
IAD2801-2BRI-A/K9
VIC2-2BRI-NT/TE-P
HWIC-1ADSL
Not Available
LTD Option1
IAD2801-4BRI-A/K9
VIC2-2BRI-NT/TE-P
HWIC-1ADSL
VIC2-2BRI-NT/TE-P
LTD Option1
IAD2801-4BRI-S/K9
VIC2-2BRI-NT/TE-P
HWIC-4SHDSL
VIC2-2BRI-NT/TE-P
LTD Option1
1 LTD OPTION (Factory installable or Field Upgradable)
1 - HWIC-AP-AG-E and HWIC-AP-G-E
1 - HWIC-4ESW
1 - VIC-4FXS/DID
Unsupported Card Message
If any unsupported card is detected during the bootup, the following message appears:
"Card is not supported in slot 2. Please remove it."
This message appears for each unsupported card detected.
If any cards are not supported and smart-init is enabled, another message appears during bootup:
Smart Init is enabledsmart init is sizing iomemID MEMORY_REQ TYPE0X003AA110 public buffer pools0X00211000 public particle pools0X00020000 Crypto module pools0X00120000 VPM buffer pools0X05B3 0X000034A0 Card in slot 00X04C8 0X00077D00 Card in slot 10X05B3 0X00000000 UNKNOWN Card in slot 20X003A 0X00000000 Card in slot 30X000021B8 Onboard USBCaveats
For general information on caveats and the bug toolkit, see About Cisco IOS Release Notes located at http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4xy15/ReleaseNote.html.
This section contains the following caveat information:
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Open Caveats - Cisco IOS Release 12.4(20)YA3
There are no open caveats in this release.
Resolved Caveats - Cisco IOS Release 12.4(20)YA3
CSCsu84868 c3845: Error mesg %SYS-2-BADSHARE: Bad refcount in datagram_done.Symptom Cisco 3845 experiences trackback error:
Aug 14 12:34:55.960: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=7006C010, count=0, -Traceback= 0x61816650 0x60641BD0 0x60C27A80 Aug 17 16:51:45.739: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=705985A4, count=0, -Traceback= 0x61816650 0x60641BD0 0x60C27A80
Conditions
Workaround
CSCsy22826 VG224 sending incorrect ssType in 1+ node CUCM cluster.Symptom VG224 endpoint does not connect to callback destination, once the callback destination is idle.
Conditions
Workaround
Further Problem Description: The activation of the callback is successful. What fails is when the callback destination becomes idle again and the VG224 endpoint gets notified (ring). After the VG224 endpoint goes offhook, the system should automatically connect to the Callback destination.This does not happen and VG224 endpoint gets silence.
Open Caveats - Cisco IOS Release 12.4(20)YA2
There are no open caveats in this release.
Resolved Caveats - Cisco IOS Release 12.4(20)YA2
CSCsr16693A series of TCP packets may cause a denial of service (DoS) condition on Cisco IOS devices that are configured as Easy VPN servers with the Cisco Tunneling Control Protocol (cTCP) encapsulation feature. Cisco has released free software updates that address this vulnerability. No workarounds are available; however, the IPSec NAT traversal (NAT-T) feature can be used as an alternative.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml.
Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. All of the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier.
http://www.cisco.com/en/US/products/products_security_advisories_listing.html
CSCsu21828A series of TCP packets may cause a denial of service (DoS) condition on Cisco IOS devices that are configured as Easy VPN servers with the Cisco Tunneling Control Protocol (cTCP) encapsulation feature. Cisco has released free software updates that address this vulnerability. No workarounds are available; however, the IPSec NAT traversal (NAT-T) feature can be used as an alternative.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml.
Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. All of the advisories address vulnerabilities in Cisco IOS Software. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier.
http://www.cisco.com/en/US/products/products_security_advisories_listing.html
CSCsv38166The server side of the Secure Copy (SCP) implementation in Cisco IOS software contains a vulnerability that could allow authenticated users with an attached command-line interface (CLI) view to transfer files to and from a Cisco IOS device that is configured to be an SCP server, regardless of what users are authorized to do, per the CLI view configuration. This vulnerability could allow valid users to retrieve or write to any file on the device's file system, including the device's saved configuration and Cisco IOS image files, even if the CLI view attached to the user does not allow it. This configuration file may include passwords or other sensitive information.
The Cisco IOS SCP server is an optional service that is disabled by default. CLI views are a fundamental component of the Cisco IOS Role-Based CLI Access feature, which is also disabled by default. Devices that are not specifically configured to enable the Cisco IOS SCP server, or that are configured to use it but do not use role-based CLI access, are not affected by this vulnerability.
This vulnerability does not apply to the Cisco IOS SCP client feature.
Cisco has released free software updates that address this vulnerability.
There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml.
CSCsu11522A vulnerability exists in the Session Initiation Protocol (SIP) implementation in Cisco IOS software that can be exploited remotely to cause a reload of the Cisco IOS device.
Cisco has released free software updates that address this vulnerability. There are no workarounds available to mitigate the vulnerability apart from disabling SIP, if the Cisco IOS device does not need to run SIP for VoIP services. However, mitigation techniques are available to help limit exposure to the vulnerability.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml.
CSCsk64158Symptom Several features within Cisco IOS software are affected by a crafted UDP packet vulnerability. If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the interface being blocked, transit traffic will not block the interface.
Conditions
Workaround
CSCsk41593 PAK_SUBBLOCK error found when ping with >1500-byte over cellular inter.Symptom The following error occurs when a ping packet is sent or received:
PAK_SUBBLOCK_ALREADY: 2 -Process= "IP Input"Conditions
Workaround
CSCso30142 Traceback due to channel-group configuration.Symptom Traceback is generated during boot up.
Conditions
Workaround
CSCso39750 router crashes at socket_inherit_fd after no ccm sccp.CSCso39964 QoS:router hangs while removing class-map.Symptom The router hangs when attempts are made to modify pure ACL configuration while traffic is still flowing.
Conditions
Workaround
CSCso41513 helper-address triggers ARP for non directly connected server.Symptom When using the <CmdBold>ip helper-address<noCmdBold> command to forward directed broadcast, an incomplete ARP entry will be created for the helper-address configured even if it is not a directly connected subnet. This may break BOOTP forwarding to the DHCP server.
Conditions
Workaround
Alternate Workaround: Configure static ARP on the router for the helper-address pointing towards the next hop.
CSCso52548 parser breakage in crypto isakmp key <> CLI.Symptom crypto isakmp key cli parser mode breakage.
Conditions
Workaround
Further information: Not service impacting. Only that, crypto isakmp key <0/6> ? option gives "% Ambiguous command" instead of WORD for (UNENCRYPTED/ENCRYPTED) password.
CSCso61743 Router crashes@stcapp_free_supported_codec_list when stop/start stcapp.Symptom Router crashes when stcapp is disabled, stcapp ccm-group is removed from configuration, and then stcapp is re-enabled.
Conditions
Workaround
CSCsq20970 ATM option missing, while configuring T1 controller for mode atm.Symptom On the 2432 platform UUT, the 'atm' option is missing in the 'mode' CLI when the T1 controller is being configured for ATM.
Conditions
Workaround
CSCsq91960 failed to delete vrf when it is 32 characters long.Symptom VRF may not get deleted if the VRF NAME size is 32 characters on a dual RP HA/SSO router.
Conditions
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Workaround
CSCsq97697 No dialtone is heard when an outgoing call is made right after call disc.Symptom Sometimes dialtone is not heard when user disconnects the existing call and immediately makes another outgoing call via hookflash.
Conditions
Workaround
CSCsr06625 telephony-service command throws % Invalid input detected.CSCsr27960 Traceback observed after configuring credential under sip-ua.Symptom Traceback observed when configuring credentials CLI under sip-ua.
Conditions
Workaround
CSCsr68545 Error %DATACORRUPTION-1-DATAINCONSISTENCY when running ipsla with rtt.Symptom Error message occurs:
000302: Jul 24 13:00:13.575 CDT: %DATACORRUPTION-1-DATAINCONSISTENCY: copyerror -Traceback= 0x410FD1A4 0x41119DB0 0x41138324 0x41DE5714Conditions
Workaround
CSCsr74835 incorrect uses of sprintf() in tcp/telnet.c.Symptom Certain sprintf() calls in tcp/telnet.c are incorrect.
Conditions
Workaround
CSCsr78883 Router console displays messages "Data corruption Data Inconsistency.Symptom There will be traceback on configuring mls qos cos pass-through dscp in supporting interface mode.
Conditions
Workaround
Further Problem Description: Due to the buffer overflow, there will be traceback when configuring the QoS in the supporting interface. Currently the CLI is not supported in most network modules, and is thus, invisible to the users.
CSCsr92741 TCP packets with zero fields misbehavior.Symptom When a TCP packet with all fields set to "zero" (at a tcp level) is sent to a remote router (whether using ipv4 and IPv6). The destination router (to which the destination IP belongs), will send a ACK/RST flag set TCP packet back to the source.
Workaround
CSCsu18029 IAD2801 routers not booting up
CSCsu24050 Multiple PRC_NON_COMPLIANCE tracebacks found on configuring stcapp FAC.CSCsu58305 c880 build breaks due to stricter compiler flags in the throttle branch.CSCsu64215 ip tcp adjust-mss command results in packet loss for non-TCP traffic.Symptom Router may incorrectly drop non TCP traffic. TFTP and EIGRP traffic can be impacted as seen in CSCsv89579.
Conditions
Workaround
CSCsv13562 Router crashes due to double free of ccb->call_info.origRedirectNumber.Symptom The router crashes due to double free scenarios. While handling 302 response, "ccb->call_info.origRedirectNumber" attempts a double free due to signaling forking.
Conditions
Workaround
CSCsv54651 Crafted VTP packet could cause a crash.Cisco's VTP protocol implementation in some versions of Cisco IOS and CatOS may be vulnerable to a DoS attack via a specially crafted VTP packet sent from the local network segment when operating in either server or client VTP mode. When the device receives the specially crafted VTP packet, the switch may crash (and reload/hang). The crafted packet must be received on a switch interface configured to operate as a trunk port.
Workaround
This response is posted at http://www.cisco.com/warp/public/707/cisco-sr-20081105-vtp.shtml
CSCsv84605 When phone is onhook, media shouldn't be handled.Symptom Reporting port hang. The symptom is that when the port is blocked, the underlying low layer (VPM, VTSP) is already in clean IDLE state, but STCAPP keeps itself in the REM_ONHOOK_PEND -> CONNECTING -> ACTIVE_PENDING -> ONHOOK_PEND -> REM_ONHOOK_PEND loop.
Conditions
Workaround
Resolved Caveats - Cisco IOS Release 12.4(20)YA1
CSCsu70214A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsw47076A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsv48603A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsx07114A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsu50252A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsy54122A vulnerability exists in Cisco IOS software where an unauthenticated attacker could bypass access control policies when the Object Groups for Access Control Lists (ACLs) feature is used. Cisco has released free software updates that address this vulnerability. There are no workarounds for this vulnerability other than disabling the Object Groups for ACLs feature. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml.
CSCsy15227Cisco IOS Software configured with Authentication Proxy for HTTP(S), Web Authentication or the consent feature, contains a vulnerability that may allow an unauthenticated session to bypass the authentication proxy server or bypass the consent webpage.
There are no workarounds that mitigate this vulnerability.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-auth-proxy.shtml
CSCsz38104The H.323 implementation in Cisco IOS Software contains a vulnerability that can be exploited remotely to cause a device that is running Cisco IOS Software to reload. Cisco has released free software updates that address this vulnerability. There are no workarounds to mitigate the vulnerability apart from disabling H.323 if the device that is running Cisco IOS Software does not need to run H.323 for VoIP services. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-h323.shtml.
CSCsq58779Cisco IOS devices that are configured for Cisco Unified Communications Manager Express (CME) and the Extension Mobility feature are vulnerable to a buffer overflow vulnerability. Successful exploitation of this vulnerability may result in the execution of arbitrary code or a Denial of Service (DoS) condition on an affected device.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-cme.shtml.
CSCsr18691Cisco IOS devices that are configured with Cisco IOS Zone-Based Policy Firewall Session Initiation Protocol (SIP) inspection are vulnerable to denial of service (DoS) attacks when processing a specific SIP transit packet. Exploitation of the vulnerability could result in a reload of the affected device.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available within the workarounds section of the posted advisory.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.shtml
CSCsy07555Cisco IOS devices that are configured for Internet Key Exchange (IKE) protocol and certificate based authentication are vulnerable to a resource exhaustion attack. Successful exploitation of this vulnerability may result in the allocation of all available Phase 1 security associations (SA) and prevent the establishment of new IPsec sessions.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-ipsec.shtml
CSCee72997Cisco IOS devices that are configured for Internet Key Exchange (IKE) protocol and certificate based authentication are vulnerable to a resource exhaustion attack. Successful exploitation of this vulnerability may result in the allocation of all available Phase 1 security associations (SA) and prevent the establishment of new IPsec sessions. Cisco has released free software updates that address this vulnerability. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-ipsec.shtml
CSCsu24505Cisco IOS Software with support for Network Time Protocol (NTP) version (v4) contains a vulnerability processing specific NTP packets that will result in a reload of the device. This results in a remote denial of service (DoS) condition on the affected device.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available and are documented in the workarounds section of the posted advisory.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-ntp.shtml
CSCsv75948Cisco IOS Software with support for Network Time Protocol (NTP) version (v4) contains a vulnerability processing specific NTP packets that will result in a reload of the device. This results in a remote denial of service (DoS) condition on the affected device.
Cisco has released free software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available and are documented in the workarounds section of the posted advisory.
This advisory is posted at the following link:
http://www.cisco.com/warp/public/707/cisco-sa-20090923-ntp.shtml
CSCsx25880A vulnerability exists in the Session Initiation Protocol (SIP) implementation in Cisco IOS Software that could allow an unauthenticated attacker to cause a denial of service (DoS) condition on an affected device when the Cisco Unified Border Element feature is enabled. Cisco has released free software updates that address this vulnerability. For devices that must run SIP there are no workarounds; however, mitigations are available to limit exposure of the vulnerability. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-sip.shtml.
CSCsq24002Cisco IOS Software contains a vulnerability that could allow an attacker to cause a Cisco IOS device to reload by remotely sending a crafted encryption packet. Cisco has released free software updates that address this vulnerability. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-tls.shtml.
CSCsq31776Cisco devices running affected versions of Cisco IOS Software are vulnerable to a denial of service (DoS) attack if configured for IP tunnels and Cisco Express Forwarding. Cisco has released free software updates that address this vulnerability. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-tunnels.shtml.
CSCsx70889Cisco devices running affected versions of Cisco IOS Software are vulnerable to a denial of service (DoS) attack if configured for IP tunnels and Cisco Express Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-tunnels.shtml.
CSCsh97579Cisco devices running affected versions of Cisco IOS Software are vulnerable to a denial of service (DoS) attack if configured for IP tunnels and Cisco Express Forwarding.
Cisco has released free software updates that address this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20090923-tunnels.shtml.
Additional References
Use this release note with the documents and websites in this release note and the documents listed in the following sections:
Release-Specific Documents
The following documents are specific to Release 12.4 and apply to Release 12.4(20)YA.
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Platform-Specific Documents
Hardware installation guides, configuration and command reference guides, and additional documents specific to the Cisco 2800 series routers are at:
http://www.cisco.com/en/US/products/ps7214/tsd_products_support_series_home.html
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents.
Documentation Modules
Each module in the Cisco IOS documentation set consists of one or more configuration guides and one or more corresponding command references. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference. Cisco IOS Software Documentation is available in html or pdf form.
Select your release and click the command references, configuration guides, or any other Cisco IOS documentation you need.
Notices
See the "Notices" section in About Cisco IOS Release Notes located at: http://www.cisco.com/en/US/docs/ios/12_4/12_4x/12_4xy15/ReleaseNote.html.
Use this document in conjunction with the documents listed in the "Additional References" section.
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