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Table Of Contents
Release Notes for the Cisco PDSN Feature in Cisco IOS Release 12.4(15)XN
Determining the Software Version
Upgrading to a New Software Release
Packet Data Serving Node Software Features in Release 12.4(15)XN
Obtaining Documentation, Obtaining Support, and Security Guidelines
Release Notes for the Cisco PDSN Feature in Cisco IOS Release 12.4(15)XN
11 December 2007
Cisco IOS Release 12.4(15)XN is a special release that is based on Cisco IOS Release12.4, with the addition of enhancements to the Cisco Packet Data Serving Node (Cisco PDSN) feature. The Cisco IOS Release 12.4(15)XN is a release optimized for the Cisco PDSN feature on the Cisco 7609 Internet Router, and Cisco 6500 Catalyst Switch platform.
Contents
These release notes include important information and caveats for the Cisco PDSN software feature provided in Cisco IOS 12.4(15)XN for the Cisco 7609 Internet Router and Cisco 6500 Catalyst Switch platforms.
Caveats for Cisco IOS Release 12.4 can be found on CCO at:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/tsd_products_support_series_home. html
Release notes for Cisco 7000 Family for Release 12.4T can be found on CCO at:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/prod_release_notes_list.html
Release notes for the Cisco 6000 Family for 12.4T can be found on CCO at:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/prod_release_notes_list.html
This release note includes the following topics:
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Upgrading to a New Software Release
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Introduction
Cisco PDSN is an IOS software feature that enables a Multi-Processor WAN Application Module (MWAM) on a Catalyst 6500 Switch or 7600 Internet router to function as a gateway between the wireless Radio Access Network (RAN) and the Internet. With Cisco PDSN enabled on a router, a stationary or roaming mobile user can access the Internet, a corporate network intranet, or Wireless Application Protocol (WAP) services. Cisco PDSN supports both Simple IP operation and Mobile IP operation.
System Requirements
This section describes the system requirements for Cisco IOS Release 12.4(15)XN:
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Memory Requirements
Table 1 shows the memory requirements for the PDSN Software Feature Set that supports the MWAM card on the Cisco 6500 Catalyst Switch platform and 7600 Internet router platform. The table also lists the memory requirements for the IP Standard Feature Set (for the Home Agent [HA]).
Hardware Supported
Cisco IOS Release 12.4(15)XN is optimized for the MWAM card on the Cisco 6500 Catalyst Switch platform, and 7600 Internet router platform.
A Hardware-Software Compatibility Matrix is available on CCO for users with CCO login accounts. This matrix allows users to search for supported hardware components by entering a Cisco platform and IOS Release. The Hardware-Software Compatibility Matrix tool is available at the following URL:
http://www.cisco.com/pcgi-bin/front.x/Support/HWSWmatrix/hwswmatrix.cgi
Software Compatibility
Cisco IOS Release 12.4(15)XN is a special release that is developed on Cisco IOS Release 12.4.
Cisco IOS Release 12.4(15)XN supports the same features that are in Cisco IOS Release 12.4, with the addition of the Cisco PDSN feature.
Determining the Software Version
To determine the version of Cisco IOS software running on your router, log in to the router and enter the show version EXEC command:
Router#show versionCisco IOS Software, MWAM Software (MWAM-C6IS-M), Version 12.4(15)XN , RELEASE SOFTWARECopyright (c) 1986-2007 by Cisco Systems, Inc.Compiled Tue 11-Dec-07 15:44 by jsomiramROM: System Bootstrap, Version 12.2(11)YS2 RELEASE SOFTWAREPDSN-S2000-BAL uptime is 4 minutesSystem returned to ROM by bus error at PC 0x2033D804, address 0x283 at 06:56:44 PDT Mon Dec 3 2007System restarted at 03:29:24 PDT Tue Dec 11 2007System image file is "svcmwam-c6is-mz.xn"Cisco MWAM (MWAM) processor with 997376K/32768K bytes of memory.SB-1 CPU at 700MHz, Implementation 1025, Rev 0.2Last reset from power-on1 Gigabit Ethernet interface511K bytes of non-volatile configuration memory.Configuration register is 0x4Router#Upgrading to a New Software Release
The following sections contain details on how to upgrade your Cisco PDSN:
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Upgrading the Supervisor Image
To upgrade the Supervisor image, perform the following procedure:
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boot system disk0:s72033-advipservicesk9_wan-mz.122-18.SXE3.bin
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Both active and standby SUP will reload simultaneously and come up with the SXE3-based image.
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Upgrading the PDSN Image on MWAM
To upgrade an image on the Cisco MWAM, you will need a compact flash card that has the MP partition from the current image or later, and a recent supervisor image. To locate the images, please go to the Software Center at Cisco.com (http://www.cisco.com/public/sw-center/)
Upgrading the Controller PDSN on MWAM:
To upgrade to an IOS 12.4(15)XN image on the PDSN controller, perform the following procedure:
Step 1
Log onto the supervisor and boot the MP partition on the PC.
SUP-PDSN#hw-module module 8 reset cf:1Device BOOT variable for reset = <cf:1>Warning: Device list is not verified.Proceed with reload of module?[confirm]% reset issued for module 8SUP-HA#SUP-HA#Nov 10 18:01:29.624: %SNMP-5-MODULETRAP: Module 8 [Down] TrapNov 10 18:01:29.624: SP: The PC in slot 8 is shutting down. Please wait ...Nov 10 18:01:55.252: SP: PC shutdown completed for module 8Nov 10 18:01:55.256: %C6KPWR-SP-4-DISABLED: power to module in slot 8 set off (Reset)Nov 10 18:04:00.195: SP: OS_BOOT_STATUS(8) MP OS Boot Status: finished bootingNov 10 18:04:42.299: %SNMP-5-MODULETRAP: Module 8 [Up] TrapNov 10 18:04:42.271: %DIAG-SP-6-BYPASS: Module 8: Diagnostics is passedNov 10 18:04:43.143: %OIR-SP-6-INSCARD: Card inserted in slot 8, interfaces are now onlineSUP-PDSN#Step 2
copy tftp: tftp file location pclc# linecard #-fs:
The upgrade file uses a special format that makes this process slow. The following example illustrates the upgrade process output:
SUP-PDSN#$/10.77.155.10/pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005 pclc#8-fs:Destination filename [c6svc5fmwam-h1is-mz.R30_11092005]?Accessing tftp://10.77.155.10/pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005...Loading pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005 from 10.77.155.10 (via Vlan10): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!![OK - 24168088 bytes]24168088 bytes copied in 192.376 secs (125629 bytes/sec)SUP-PDSN#Nov 10 18:09:03.903: %SVCLC-SP-5-STRRECVD: mod 8: <Application upgrade has started>Nov 10 18:09:03.903: %SVCLC-SP-5-STRRECVD: mod 8: <Do not reset the module till upgrade completes!!>Nov 10 18:09:42.022: %SVCLC-SP-5-STRRECVD: mod 8: <Application upgrade has succeeded>Nov 10 18:09:42.022: %SVCLC-SP-5-STRRECVD: mod 8: <You can now reset the module>SUP-PDSN#Step 3
SUP-PDSN#hw-module module 8 reset cf:4Device BOOT variable for reset = <cf:4>Warning: Device list is not verified.Proceed with reload of module?[confirm]% reset issued for module 8SUP-PDSN#Nov 10 18:10:34.831: %SNMP-5-MODULETRAP: Module 8 [Down] TrapNov 10 18:10:34.831: SP: The PC in slot 8 is shutting down. Please wait ...Nov 10 18:10:57.387: SP: PC shutdown completed for module 8Nov 10 18:10:57.391: %C6KPWR-SP-4-DISABLED: power to module in slot 8 set off (Reset)Nov 10 18:12:13.370: SP: OS_BOOT_STATUS(8) MWAMNov 10 18:14:30.447: %SNMP-5-MODULETRAP: Module 8 [Up] TrapNov 10 18:14:30.434: %DIAG-SP-6-BYPASS: Module 8: Diagnostics is passedNov 10 18:14:31.293: %OIR-SP-6-INSCARD: Card inserted in slot 8, interfaces are now onlineStep 4
7600a-cont2# show cdma pdsn cluster controller member loadSecs until Seq seeks Member(past) seek no reply IPv4 Addr State Load Sessions-------------------------------------------------------------------2 0 20.20.10.2 ready 0 158 0 20.20.10.1 ready 0 15-------------------------------------------------------------------Controller IPv4 Addr 20.20.101.1057600a-cont2# show cdma pdsn cluster controller session count30 session recordsStep 5
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7600a-cont1#show cdma pdsn cluster controller member loadSecs until Seq seeks Member(past) seek no reply IPv4 Addr State Load Sessions-------------------------------------------------------------------2 0 20.20.10.2 ready 0 158 0 20.20.10.1 ready 0 15-------------------------------------------------------------------Controller IPv4 Addr 20.20.101.1057600a-cont1# show cdma pdsn cluster controller session count30 session records
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Upgrading the Member PDSN on MWAM
To upgrade to the 12.4(15)XN image on the PDSN, perform the following procedure:
Step 1
7600a-pdsn1(config)# cdma pdsn cluster member prohibit administrativelyThe calls, which are already connected to the member, will be alive until the mobile node disconnects the call. Alternatively, the calls can be forcibly cleared on the prohibited member using the following command:
7600a-pdsn1(config)# clear cdma pdsn session allStep 2
Log onto the supervisor and boot the MP partition on the PC.
SUP-PDSN# hw-module module 8 reset cf:1Device BOOT variable for reset = <cf:1>Warning: Device list is not verified.Proceed with reload of module?[confirm]% reset issued for module 8SUP-HA#SUP-HA#Nov 10 18:01:29.624: %SNMP-5-MODULETRAP: Module 8 [Down] TrapNov 10 18:01:29.624: SP: The PC in slot 8 is shutting down. Please wait ...Nov 10 18:01:55.252: SP: PC shutdown completed for module 8Nov 10 18:01:55.256: %C6KPWR-SP-4-DISABLED: power to module in slot 8 set off (Reset)Nov 10 18:04:00.195: SP: OS_BOOT_STATUS(8) MP OS Boot Status: finished bootingNov 10 18:04:42.299: %SNMP-5-MODULETRAP: Module 8 [Up] TrapNov 10 18:04:42.271: %DIAG-SP-6-BYPASS: Module 8: Diagnostics is passedNov 10 18:04:43.143: %OIR-SP-6-INSCARD: Card inserted in slot 8, interfaces are now onlineSUP-PDSN#Step 3
copy tftp: tftp file location pclc# linecard #-fs:The upgrade file uses a special format that makes this process slow. The following example illustrates the upgrade process output:
SUP-PDSN#$/10.77.155.10/pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005 pclc#8-fs:Destination filename [c6svc5fmwam-h1is-mz.R30_11092005]?Accessing tftp://10.77.155.10/pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005...Loading pdsn/images/c6svc5fmwam-h1is-mz.R30_11092005 from 10.77.155.10 (via Vlan10): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!![OK - 24168088 bytes]24168088 bytes copied in 192.376 secs (125629 bytes/sec)SUP-PDSN#Nov 10 18:09:03.903: %SVCLC-SP-5-STRRECVD: mod 8: <Application upgrade has started>Nov 10 18:09:03.903: %SVCLC-SP-5-STRRECVD: mod 8: <Do not reset the module till upgrade completes!!>Nov 10 18:09:42.022: %SVCLC-SP-5-STRRECVD: mod 8: <Application upgrade has succeeded>Nov 10 18:09:42.022: %SVCLC-SP-5-STRRECVD: mod 8: <You can now reset the module>SUP-PDSN#Step 4
SUP-PDSN#hw-module module 8 reset cf:4Device BOOT variable for reset = <cf:4>Warning: Device list is not verified.Proceed with reload of module?[confirm]% reset issued for module 8SUP-PDSN#Nov 10 18:10:34.831: %SNMP-5-MODULETRAP: Module 8 [Down] TrapNov 10 18:10:34.831: SP: The PC in slot 8 is shutting down. Please wait ...Nov 10 18:10:57.387: SP: PC shutdown completed for module 8Nov 10 18:10:57.391: %C6KPWR-SP-4-DISABLED: power to module in slot 8 set off (Reset)Nov 10 18:12:13.370: SP: OS_BOOT_STATUS(8) MWAMNov 10 18:14:30.447: %SNMP-5-MODULETRAP: Module 8 [Up] TrapNov 10 18:14:30.434: %DIAG-SP-6-BYPASS: Module 8: Diagnostics is passedNov 10 18:14:31.293: %OIR-SP-6-INSCARD: Card inserted in slot 8, interfaces are now onlineStep 5
7600a-pdsn1(config)# no cdma pdsn cluster member prohibit administratively
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Changing Configuration on the PDSN in a Live Network
If you need to change the working configuration on a PDSN in a live network environment, perform the following procedure:
Step 1
7600a-Stdy(config)# no cdma pdsn redundancyStep 2
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Step 5
7600a-Stdy#show standby briefP indicates configured to preempt.|Interface Grp Prio P State Active Standby Virtual IPGi0/0.101 300 110 Standby 20.20.101.10 local 20.20.101.1017600a-Stdy# show cdma pdsn redundancyCDMA PDSN Redundancy is enabledCDMA PDSN Session Redundancy system statusPDSN state = STANDBY HOTPDSN-peer state = ACTIVECDMA PDSN Session Redundancy StatisticsLast clearing of cumulative counters neverTotal CurrentSynced from active ConnectedSessions 15 15SIP Flows 15 15MIP Flows 0 0PMIP Flows 0 07600a-Stdy#show redundancy inter-deviceRedundancy inter-device state: RF_INTERDEV_STATE_STDBYScheme: StandbyGroupname: pdsn-rp-sr1 Group State: StandbyPeer present: RF_INTERDEV_PEER_COMMSecurity: Not configured7600a-Stdy#show redundancy statesmy state = 8 -STANDBY HOTpeer state = 13 -ACTIVEMode = DuplexUnit ID = 0Split Mode = DisabledManual Swact = EnabledCommunications = Upclient count = 9client_notification_TMR = 30000 millisecondsRF debug mask = 0x07600a-Stdy#Step 6
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For information on upgrading to a new software release, see the product bulletin Cisco IOS Software Upgrade Ordering Instructions located at:
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm
MIBs
Old Cisco Management Information Bases (MIBs) will be replaced in a future release. Currently, OLD-CISCO-* MIBs are being converted into more scalable MIBs—without affecting existing Cisco IOS products or NMS applications. You can update from deprecated MIBs to the replacement MIBs as shown in Table 2.
Cisco IOS Feature Sets
The Cisco IOS software is packaged in feature sets consisting of software images—depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Cisco IOS Release 12.4(15)XN supports the same feature sets as Cisco Release 12.4, with the exception that Cisco Release 12.4(15)XN includes the PDSN feature. The PDSN feature is optimized for the Cisco MWAM card on the 6500 Catalyst Switch and 7600 Internet router.
Caution
Packet Data Serving Node Software Features in Release 12.4(15)XN
The Cisco IOS Release 12.4(15)XN supports the same feature sets as Cisco Release 12.4, with the exception that Cisco Release 12.4(15)XN includes the PDSN feature. The Cisco PDSN feature is optimized for the Cisco MWAM card on the 6500 Catalyst Switch and 7600 Internet router, and includes the following features:
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All other software features in Cisco IOS Release 12.3 are described in the documentation for Cisco IOS Release 12.3, which can be found at:
http://www.cisco.com/en/US/products/sw/iosswrel/tsd_products_support_category_home.html
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
Caveats for Cisco IOS Releases 12.3 can be found on CCO at http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/prod_release_notes_list.html
The "Open Caveats" section lists open caveats that apply to the current release and might also apply to previous releases.
The "Resolved Caveats" section lists caveats resolved in a particular release, which may have been open in previous releases.
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Open Caveats
The following caveats are unresolved in Cisco IOS Release 12.4(15)XN:
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A Cisco router running the Cisco PDSN IOS software shows the following message multiple times every two hours:
%SYS-2-LINKED: Bad enqueue of 0 in queue 6371EE20-Process= "Per-minute Jobs", ipl= 4, pid= 121-Traceback= 60743778 60721EC4 606AA8FC 6072B370 606CA998This condition occurs under high stress involving multiple SIP and MIP calls with flapping and handoffs.
Workaround: none.
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On a Cisco router running 12.4PIL06 image and acting as PDSN, when a Closed RP session is cleared using the clear cdma pdsn session pcf ip-addr send termreq command, the closed RP tunnel is not getting closed
Workaround: none.
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On a Cisco router running the PDSN R3.5 image, invalid Normal Burst and Excess Burst are calculated for certain CIR.
This condition occurs while downloading CIR of 2000000000 bps.
Workaround: none.
Resolved Caveats
The following caveats are resolved in Cisco IOS Release 12.4(15)XN:
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Multiple vulnerabilities exist in the Session Initiation Protocol (SIP) implementation in Cisco IOS that can be exploited remotely to trigger a memory leak or to cause a reload of the Cisco IOS device.
Cisco has released free software updates that address these vulnerabilities. Fixed Cisco IOS software listed in the Software Versions and Fixes section contains fixes for all vulnerabilities addressed in this advisory.
There are no workarounds available to mitigate the effects of any of the vulnerabilities apart from disabling the protocol or feature itself, if administrators do not require the Cisco IOS device to provide voice over IP services.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080924-sip.shtml.
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Cisco IOS contains multiple vulnerabilities in the Data-link Switching (DLSw) feature that may result in a reload or memory leaks when processing specially crafted UDP or IP Protocol 91 packets.
Cisco has released free software updates that address these vulnerabilities. Workarounds are available to mitigate the effects of these vulnerabilities.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20080326-dlsw.shtml
Related Documentation
Except for feature modules, documentation is available as printed manuals or electronic documents. Feature modules are available online on CCO and the Documentation CD-ROM.
Use these release notes with these documents:
Release-Specific Documents
The following documents are specific to Cisco IOS Release 12.4T:
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http://www.cisco.com/en/US/products/ps6706/products_feature_guides_list.html
Platform-Specific Documents
Documentation specific to the Cisco 7600 Router is located at the following location:
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Documentation specific to the Cisco Catalyst 6500 Switch is located at the following location:
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Obtaining Documentation, Obtaining Support, and Security Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback, security guidelines, and also recommended aliases and general Cisco documents, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
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