Table Of Contents
Release Notes for Cisco uBR7246
Universal Broadband Router
for Cisco IOS Release 11.3 TCisco Data-over-Cable Products
Cisco uBR7246 Universal Broadband Router
Determining the Version of Your Software Release
Upgrading to a New Software Release
No New Features in Cisco IOS Release 11.3(11)T
No New Features in Cisco IOS Release 11.3(10)T
No New Features in Cisco IOS Release 11.3(9)T
No New Features in Cisco IOS Release 11.3(8)T
No New Features in Cisco IOS Release 11.3(7)T
No New Features in Cisco IOS Release 11.3(6)T
No New Features in Cisco IOS Release 11.3(5)T
New Features in Cisco IOS Release 11.3(4)T
IP Type of Service and Precedence for GRE Tunnels
New Features in Cisco IOS Release 11.3(3)T
Named Method Lists for AAA Authorization and Accounting
Automated Double Authentication
Microsoft Point-to-Point Compression (MPPC)
National ISDN Switch Types for BRI and PRI
Additional Vendor-Proprietary RADIUS Attributes
New Features in Cisco IOS Release 11.3(2)XA
Cisco uBR7246 Universal Broadband Router
No New Features in Cisco IOS Release 11.3(1)T
Cisco IOS Release 11.3, 11.3 NA and 11.3 T End of Sales and End of Engineering
Image Deferral, Cisco IOS Release 11.3(8)T
Forwarding of Locally Sourced AppleTalk Packets
Missing Source-Route Bridging Commands
New TACACS+ Attribute-Value Pair
40-bit Encryption Images are Unavailable in Release 11.3(1)
Affected Devices and Software Releases
Cisco IOS Software Documentation Set
Release 11.3 Documentation Set
Software Configuration Tips on the Cisco Technical Assistance Center Home Page
Release Notes for Cisco uBR7246
Universal Broadband Router
for Cisco IOS Release 11.3 T
August 2, 1999
These release notes for the Cisco uBR7246 universal broadband router support Cisco IOS Release 11.3 T, up to and including Release 11.3(11)T. Cisco IOS Release 11.3(11)T is based on Cisco IOS Release 11.3. These release notes are updated as needed to describe new features, new memory requirements, new hardware support, and other important information regarding the operation of the Cisco uBR7246.
For a list of software caveats that apply to Release 11.3(11)T, refer to the Caveats for Cisco IOS Release 11.3 T document that accompanies these release notes. This caveats document is updated for every maintenance release and is located on Cisco Connection Online (CCO) and the Documentation CD-ROM. For more information, refer to the "Caveats" section of this document.
Use these release notes with the cross platform Release Notes for Cisco IOS Release 11.3 located on CCO and the Documentation CD-ROM.
Contents
These release notes discuss the following topics:
Introduction
This section contains information about the Cisco uBR7246 universal broadband router and Early Deployment Releases (ED) for the Cisco uBR7246.
Cisco Data-over-Cable Products
The Cisco uBR7246 universal broadband router and the Cisco uBR904 cable access router are based on the Data Over Cable Service Interface Specification (DOCSIS) standards. These standards are being developed by a consortium of cable television companies whose goal is to encourage vendors to develop interoperable data-over-cable products.
Cisco uBR7246 Universal Broadband Router
The Cisco uBR7246 universal broadband router is designed to allow two-way transmission of digital data over a hybrid fiber coaxial cable (HFC) network. The Cisco uBR7246 supports Internet Protocol (IP) routing with a wide variety of protocols and any combination of Ethernet, Fast Ethernet, High-Speed Serial Interface (HSSI), and Asynchronous Transfer Mode (ATM) media. The Cisco uBR7246 gives cable operators a cost-effective, scalable, and feature-rich interface between subscriber cable modems and the backbone data network.
Note
The Cisco uBR7246 recently earned DOCSIS certification from CableLabs.
Cisco uBR904 Cable Modem
The Cisco uBR904 cable modem is the subscriber unit, a key component within a cable data system. The subscriber unit functions as the interface between the subscriber's personal computer and the cable operator's network within the subscriber's small office or home office.
For more information on Cisco uBR904, refer to the "Related Documentation" section.
Early Deployment Releases
These release notes describe the Cisco uBR7246 for Cisco IOS Release 11.3(11)T. Release 11.3 T is an Early Deployment (ED) release based on Release 11.3, and delivers fixes to software caveats and support for new hardware.
briefly describes the features and availability of ED releases for the Cisco uBR7246.
System Requirements
This section describes the system requirements for Release 11.3 T and includes the following sections:
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Memory Requirements
Table 2 describes the memory requirements of the Cisco IOS feature sets for the Cisco uBR7246 universal broadband router for Release 11.3(11)T. Cisco uBR7246 universal broadband routers are shipped with a 16- or 20-MB Flash memory card.
Hardware Supported
Cisco IOS Release 11.3 T supports the Cisco uBR7246 universal broadband router.
Cisco IOS Release 11.3 T also supports the MC11 cable modem cards installed in the Cisco uBR7246 universal broadband router. The MC11 cable modem cards provide connection to the HFC network, offering one upstream port and one downstream port. The cable modem card slots are numbered from top to bottom: cable modem card slot 3, slot 4, slot 5, and slot 6.
lists the interfaces supported by the Cisco uBR7246 universal broadband router.
Table 3 Supported Interfaces on the Cisco uBR7246
PA-4E
4-port Ethernet 10BaseT port adapter
Cisco uBR7246
PA-8E
8-port Ethernet 10BaseT port adapter
Cisco uBR7246
PA-FE-TX
1-port 100BaseTX Fast Ethernet port adapter
Cisco uBR7246
PA-FE-FX
1-port 100BaseFX Fast Ethernet port adapter
Cisco uBR7246
PA-4T+
4-port synchronous serial port adapter
Cisco uBR7246
PA-8T-232
8-port EIA/TIA-232 synchronous serial port adapter
Cisco uBR7246
PA-8T-V35
8-port V.35 synchronous serial port adapter
Cisco uBR7246
PA-8T-X21
8-port X.21 synchronous serial port adapter
Cisco uBR7246
PA-4E1G-75
4-port unbalanced (75-ohm) E1-G.703/G.704 synchronous serial port adapter
Cisco uBR7246
PA-4E1G-120
4-port balanced (120-ohm) E1-G.703/G.704 synchronous serial port adapter
Cisco uBR7246
PA-H
1-port HSSI port adapter
Cisco uBR7246
PA-A1-OC3SMI
1-port ATM OC-3c/STM-1 single-mode intermediate reach port adapter
Cisco uBR7246
PA-A1-OC3MM
1-port ATM OC-3c/STM-1 multimode port adapter
Cisco uBR7246
PA-A2-4E1XC-OC3SM
5-port ATM CES2 (4 E1 120-ohm CBR3 ports and 1 OC-3 ATM single-mode port) port adapter
Cisco uBR7246
PA-A2-4E1XC-E3ATM
5-port ATM CES2 (4 E1 120-ohm CBR3 ports and 1 E3 ATM port) port adapter
Cisco uBR7246
PA-A2-4T1C-OC3SM
5-port ATM CES2 (4 T1 CBR3 ports and 1 OC-3 ATM single-mode port) port adapter
Cisco uBR7246
PA-A2-4T1C-T3ATM
5-port ATM CES2 (4 T1 CBR3 ports and 1 T3 ATM port) port adapter
Cisco uBR7246
PA-POS-OC3SML
1-port POS OC-3 single-mode, long reach port adapter
Cisco uBR7246
PA-POS-OC3SMI
1-port OC3 single-mode, intermediate reach port adapter
Cisco uBR7246
PA-POS-OC3MM
1-port POS OC3 multimode port adapter
Cisco uBR7246
1 Refer to the Documentation CD-ROM or http://www.cisco.com, http://www-china.cisco.com, or
http://www-europe.cisco.com for the most current list of supported port adapters.2 CES = circuit emulation services.
3 CBR = constant bit rate.
Determining the Version of Your Software Release
To determine the version of Cisco IOS software currently running on the Cisco uBR7246, log in to the router and enter the show version EXEC command. The IOS version number is displayed on the second line as indicated in the sample output shown below:
router>show versionCisco Internetwork Operating System SoftwareIOS (tm) 7246 Software (C7246-JS-L), Version 11.3(11)T, RELEASE SOFTWAREThe output includes additional information such as processor revision numbers, memory amounts, hardware IDs, and partition information.
Upgrading to a New Software Release
For generic information on upgrading to a new software release, refer to the Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin located on CCO.
From the CCO home page, click on this path:
Service & Support: Product Bulletins: Software
Under Cisco IOS 11.3, click on Cisco IOS Software Release 11.3 Upgrade Paths (#703: 12/97).
The Cisco IOS Software Release Upgrade Paths and Packaging Simplification product bulletin does not contain information specific to Cisco IOS Release 11.3 T, but provides generic upgrade information that may apply to Cisco IOS Release 11.3 T.
Feature Set Tables
Cisco IOS software is packaged in software images consisting of feature sets—depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Table 4 lists the Cisco IOS software feature sets available for the Cisco uBR7246 in Cisco IOS Release 11.3 T, up to and including Release 11.3(11)T.
Table 4 Feature Sets Supported by the Cisco uBR7246
MCNS Two-Way
Basic1
ubr7200-p-mz
Cisco uBR7246
1 This feature is offered in the basic feature set.
lists the features and feature sets available for the Cisco uBR7246 in Cisco IOS Release 11.3(11)T. uses the following conventions:
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Optional feature set licenses for the Cisco uBR7246 universal broadband router are as follows:
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New and Changed Information
The following sections list the new features supported by the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3 T.
No New Features in Cisco IOS Release 11.3(11)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(11)T.
No New Features in Cisco IOS Release 11.3(10)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(10)T.
No New Features in Cisco IOS Release 11.3(9)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(9)T.
No New Features in Cisco IOS Release 11.3(8)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(8)T.
No New Features in Cisco IOS Release 11.3(7)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(7)T.
No New Features in Cisco IOS Release 11.3(6)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(6)T.
No New Features in Cisco IOS Release 11.3(5)T
No new features were introduced for the Cisco uBR7246 universal broadband router in Cisco IOS Release 11.3(5)T.
New Features in Cisco IOS Release 11.3(4)T
The following software enhancement was introduced in Cisco IOS Release 11.3(4)T and is available for the Cisco uBR7246.
IP Type of Service and Precedence for GRE Tunnels
Prior to the IP Type of Service and Precedence for GRE Tunnels feature, at generic route encapsulation-based tunnel endpoints, the Type of Service (TOS) bits (including precedence bits) were not copied to the tunnel or GRE IP header that encapsulates the inner packet. Instead, those bits were set to zero. This was not a problem unless the intermediate routers between two tunnel endpoints honored TOS or precedence bits, in which case those settings were ignored.
With the advent of virtual private network (VPN) and QoS applications, it is desirable to copy the TOS bits when the router encapsulates the packets using GRE. Thus, intermediate routers between tunnel endpoints can take advantage of the QoS features such as weighted fair queuing (WFQ) and weighted random early detection (WRED).
New Features in Cisco IOS Release 11.3(3)T
The following hardware and software enhancements were introduced in Cisco IOS Release 11.3(3)T and are available for the Cisco uBR7246.
Named Method Lists for AAA Authorization and Accounting
In earlier Cisco IOS releases, only named authentication method lists were supported under Cisco's Authentication, Authorization, and Accounting (AAA) network security services. With Cisco IOS Release 11.3(3)T, AAA has been extended to support both authorization and accounting named method lists. Named Method Lists for AAA Authorization and Accounting function the same way as those for authentication: they allow you to define different methods for authorization and accounting and apply those methods on a per-interface or per-line basis.
Automated Double Authentication
The Automated Double Authentication feature enhances the previous double authentication feature. Previously with the double authentication feature, a second level of user authentication was achieved when you telnetted to the network access server or router and entered a username and password. Now, with automated double authentication, you do not have to telnet anywhere, but instead respond to a dialog box that requests a username and password or PIN.
Microsoft Point-to-Point Compression (MPPC)
Microsoft Point-to-Point Compression (MPPC) is a scheme used to compress Point-to-Point Protocol (PPP) packets between Cisco and Microsoft client devices. The MPPC algorithm is designed to optimize bandwidth utilization in order to support multiple simultaneous connections. The MPPC algorithm uses a Lempel-Ziv (LZ)-based algorithm with a continuous history buffer called a dictionary.
Multiple ISDN Switch Types
This feature allows you to configure more than one ISDN switch type per router. An ISDN switch type can be applied on a per-interface basis, thus extending the existing global isdn switch-type command to the interface level. This allows Basic Rate Interfaces (BRI) and Primary Rate Interfaces (PRI) to run simultaneously on platforms that support both interface types.
National ISDN Switch Types for BRI and PRI
National ISDN Switch Types for Basic Rate and Primary Rate Interfaces introduces changes to ISDN switch types for Primary Rate Interfaces (PRIs) and Basic Rate Interfaces (BRIs) as follows:
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Note
VPDN MIB and Syslog Facility
The Virtual Private Dialup Network (VPDN) Management Information Base (MIB) feature is intended to support all the tables and objects defined in the Cisco VPDN Management MIB for VPDN user sessions. VPDN system-wide information is available. This includes active VPDN tunnels, active user sessions in active VPDN tunnels, and failure history information, per username.
The VPDN Syslog facility provides generic logging output for VPDN information, such as Layer 2 Forwarding Protocol (L2F). The syslog messages are generated to inform authentication or authorization errors, resource issues, and time-out events.
Additional Vendor-Proprietary RADIUS Attributes
Remote Authentication Dial-In User Server (RADIUS) is an access server authentication, authorization, and accounting protocol originally developed by Livingston, Inc. Although an Internet Engineering Task Force (IETF) draft standard for RADIUS specifies a method for communicating vendor-proprietary information between the network access server and the RADIUS, this Cisco IOS software release introduces support for the following additional RADIUS attributes:
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New Features in Cisco IOS Release 11.3(2)XA
The following hardware enhancements were introduced in Cisco IOS Release 11.3(2)XA and are available for the Cisco uBR7246.
MC11 Cable Modem Cards
The MC11 cable modem cards installed in the Cisco uBR7246 provide the connection to the HFC network. The MC11 modem cards offer one upstream port and one downstream port. The cable modem card slots are numbered from top to bottom: cable modem card slot3, slot4, slot5, and slot6.
Cisco uBR7246 Universal Broadband Router
Cisco uBR7246 universal broadband features enable the Cisco uBR7246 universal broadband router to communicate with a hybrid fiber coaxial cable (HFC) network via a Cisco MC11 cable modem card. Cisco MC11 cable modem cards allow you to connect cable modems on the HFC network to a Cisco uBR7246 in a Community Antenna Television (CATV) headend facility. The modem card provides the interface between the Cisco uBR7246 protocol control information (PCI) bus and the radio frequency (RF) signal on the HFC network.
No New Features in Cisco IOS Release 11.3(1)T
There were no new features introduced for the Cisco uBR7246 in Cisco IOS Release 11.3(1)T.
Important Notes
The following section contains important notes about Cisco IOS Release 11.3 that may apply to the Cisco uBR7246.
ATM Multipoint Signaling
Prior to Cisco IOS Release 11.1(13) and 11.2(8), the atm multipoint-signaling command was used on the main interface and affected all subinterfaces. For Release 11.1(13), 11.2(8), and later releases (including Release 11.3), explicit configuration on each subinterface is required to obtain the same functionality. Refer to caveat CSCdj20944, which is described as follows:
The atm multipoint-signaling interface command is currently only available on the main ATM interface. The effect is that signaling behavior (point-to-point or point-to-multipoint) for all clients on all subinterfaces is determined by the command on the main interface.
Clients on different subinterfaces can have different behavior. Specifically, RFC1577 requires point-to-point, and PIM allows point-to-multipoint. The command should be on a per-subinterface basis.
Enable the atm multipoint-signaling command on all subinterfaces that require it. Previously, you only needed to enable the command on the main interface.
Cisco IOS Release 11.3, 11.3 NA and 11.3 T End of Sales and End of Engineering
End of Engineering (EOE) means that there are no more regularly scheduled maintenance releases. The last maintenance release scheduled on the EOE date is only available through CCO and Field Service Operations—not through manufacturing.
Cisco IOS Releases 11.3, 11.3 NA, and 11.3 T reached End of Sales (EOS) status with maintenance Releases 11.3(10), 11.3(10)NA, 11.3(10)T. Releases 11.3, 11.3 NA, and 11.3 T will reach End of Engineering (EOE) with Releases 11.3(11), 11.3(11)NA, and 11.3(11)T.
Ongoing support for functionality in Releases 11.3, 11.3 NA, and 11.3 T is available in Cisco IOS Release 12.0(4)T and later maintenance releases of Cisco IOS Release 12.0.
For more information, see End of Sales and End of Engineering for Cisco IOS Software Releases product bulletins located on CCO and refer to the "Cisco Connection Online" section.
On CCO, click on this path:
Service & Support: Product Bulletins: Software
Under Cisco IOS 11.3, click on End of Sales and End of Engineering for Cisco IOS Software Releases 11.3 and 11.3 T (#847: 12/98) or Cisco IOS Software 11.3 NA EoS and EoE (#849:12/98)
Image Deferral, Cisco IOS Release 11.3(8)T
Cisco IOS Release 11.3(8)T was deferred to Release 11.3(8)T1 on all software images to incorporate corrections to the following caveats:
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For more information on these caveats, refer to Bug Navigator II. Bug Navigator II is available at http://www.cisco.com/support/bugtools. On CCO, click this path:
Service & Support: Online Technical Support: Software Bug Toolkit: Bug Navigator II.
Enabling IPX Routing
Whenever IPX routing is enabled, the Token Ring interface resets.
Forwarding of Locally Sourced AppleTalk Packets
Cisco's implementation of AppleTalk does not forward packets with local-source and destination network addresses. This behavior does not conform to the definition of AppleTalk in Apple Computer's Inside AppleTalk publication. However, this behavior is designed to prevent any possible corruption of the AppleTalk Address Resolution Protocol (AARP) table in any AppleTalk node that collects MAC addresses.
Missing Source-Route Bridging Commands
Due to a production problem, many source-route bridging commands were omitted from the printed version of the Cisco IOS Software Command Summary (78-4746-XX). For documentation of all source-route bridging commands, refer to the Bridging and IBM Networking Command Reference (78-4743-XX). You can also obtain the most current documentation on CCO or on the Documentation CD-ROM.
New TACACS+ Attribute-Value Pair
A new authorization feature that allows you to separately configure and authorize Multilink PPP was added in Cisco IOS Release 11.3(1). This feature can cause MLP authorization to fail in TACACS+ servers that do not include the relevant authorization permissions in the configuration.
For TACACS+, add the following attribute-value (AV) pair for all users who are allowed to negotiate Multilink PPP:
service = ppp protocol = multilink {Using LAN Emulation
Note the following information regarding the LAN Emulation (LANE) feature in Cisco IOS Release 11.3:
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40-bit Encryption Images are Unavailable in Release 11.3(1)
Cisco is conducting an internal review of the build and distribution processes associated with its 40-bit Cisco IOS cryptographic products. To provide seamless access to Cisco IOS 40-bit encryption capability, Cisco will provide access to the most current 40-bit encryption images, beginning with Cisco IOS Release 11.2 (12), 11.2(12)P, and 11.3(2).
The following 40-bit encryption images are unavailable indefinitely:
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This review is not related to any new or previously unreported caveats. The information gathered in the review will be used to implement new automated development and order-processing applications.
Cisco IOS Syslog Failure
Certain releases of Cisco IOS software may fail or hang when they receive invalid User Datagram Protocol (UDP) packets sent to their syslog ports (port 514). At least one commonly-used Internet scanning tool generates packets that can cause such problems. This fact has been published on public Internet mailing lists, which are widely read both by security professionals and by security attackers. This information should be considered in the public domain.
Attackers can cause Cisco IOS devices to repeatedly fail and reload, resulting in a completely disabled Cisco IOS device that will need to be reconfigured by its administrator. Some Cisco IOS devices have been observed to hang instead of failing when attacked. These devices do not recover until they are manually restarted by reset or power cycling. An administrator must personally visit an attacked, hung device to restart it, even if the attacker is no longer actively sending any traffic. Some devices have failed without providing stack traces; some devices may indicate that they were "restarted by power-on," even when that is not the case.
Assume that any potential attacker is likely to know that existence of this vulnerability and the ways to exploit it. An attacker can use tools available to the public on the Internet and does not need to write any software to exploit the vulnerability. Minimal skill is required and no special equipment is required.
Despite Cisco specifically inviting such reports, Cisco has received no actual reports of malicious exploitation of this vulnerability.
This vulnerability notice was posted on Cisco's World Wide Web site:
http://www.cisco.com/warp/public/770/iossyslog-pub.shtml
This information was also sent to the following e-mail and Usenet news recipients:
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Affected Devices and Software Releases
Vulnerable devices and software releases are specified in , . Affected releases include Releases 11.3 AA, 11.3 DB, and all 12.0 releases (including 12.0 mainline, 12.0 S, 12.0 T, and any other regular released version whose number starts with 12.0), up to the repaired releases listed in . Cisco is correcting the vulnerability in certain special releases, will correct it in future maintenance and interim releases, and intends to provide fixes for all affected IOS variants. See , for details.
No particular configuration is needed to make a Cisco IOS device vulnerable. It is possible to filter out attack traffic by using access lists. See the "Workarounds" section for techniques. However, except at Internet firewalls, the appropriate filters are not common in customer configurations. Carefully evaluate your configuration before assuming that any filtering you have protects you against this attack.
The most commonly used or asked-about products are listed below. If you are unsure whether your device is running Cisco IOS software, log in to the device and issue the show version command. Cisco IOS software will identify itself simply as "IOS" or "Internetwork Operating System Software". Other Cisco devices will not have the show version command, or they will identify themselves differently in their output. The most common Cisco devices that run Cisco IOS software include the following:
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Affected software releases, which are relatively new, are not necessarily available on every device listed above. If you are not running Cisco IOS software, you are not affected by this vulnerability.
The following Cisco devices are not affected:
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This vulnerability has been assigned Cisco bug ID CSCdk77426.
Solution
Cisco offers free software updates to correct this vulnerability for all affected customers—regardless of their contract status. However, because this vulnerability information has been disseminated by third parties, Cisco has released this notice before updates are available for all software releases. gives Cisco's projected fix dates.
Make sure your hardware had adequate RAM to support the new software before installing it. The amount of RAM is seldom a problem when you upgrade within a major release (say, from 11.2(11)P to 11.2(17)P), but it is often a factor when you upgrade between major releases (say, from 11.2 P to 11.3 T).
Because fixes will be available for all affected releases, this vulnerability will rarely, if ever, require an upgrade to a new major release. Cisco recommends very careful planning for any upgrade between major releases. Make certain no known bugs will prevent the new software from working properly in your environment.
Further upgrade planning assistance is available on Cisco's World Wide Web site at:
http://www.cisco.com
If you have service contracts you can obtain new software through your regular update channels (generally via Cisco's World Wide Web site). You can upgrade to any software release, but you must remain within the boundaries of the feature sets you have purchased.
If you don't have service contracts, you can upgrade to obtain only the bug fixes; free upgrades are restricted to the minimum upgrade required to resolve the defects. In general, you will be restricted to upgrading within a single row of , except when no upgrade within the same row is available in a timely manner. Obtain updates by contacting one of the following Cisco Technical Assistance Centers (TACs):
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Give the URL of this notice (http://www.cisco.com/warp/public/770/iossyslog-pub.shtml) as evidence for a free update. Non-contract customers must request free updates through the TAC. Please do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software updates.
Workarounds
You can work around this vulnerability by preventing any affected Cisco IOS device from receiving or processing UDP datagrams addressed to its port 514. This can be done either using packet filtering on surrounding devices, or by using input access list filtering on the affected IOS device itself.
If you use an input access list, apply that list to all interfaces to which attackers may be able to send datagrams. Interfaces include—not only physical LAN and WAN interfaces—but virtual subinterfaces of those physical interfaces, as well as virtual interfaces and interface templates corresponding to GRE, L2TP, L2F, and other tunneling protocols.
The input access list must block traffic destined for UDP port 514 at any of the Cisco IOS device's own IP addresses, as well as at any broadcast or multicast addresses on which the Cisco IOS device may be listening. Be sure to block both old-style "all-zeros" broadcasts and new-style "all-ones" broadcasts. It is not necessary to block traffic being forwarded to other hosts—only traffic actually addressed to the Cisco IOS device is of interest. No single input access list works in all configurations. Know the effect of your access list in your specific configuration before activating it.
The following example shows a possible access list for a three-interface router, along with the configuration commands needed to apply the list. The example assumes input filtering is not needed, other than as a workaround for this vulnerability:
! Deny all multicasts, and all unspecified-net broadcasts, to port 514access-list 101 deny udp any 224.0.0.0 31.255.255.255 eq 514! Deny old-style unspecified-net broadcastsaccess-list 101 deny udp any host 0.0.0.0 eq 514! Deny network-specific broadcasts. This example assumes that all of! the local interfaces are on the class B network 172.16.0.0, subnetted! everywhere with mask 255.255.255.0. This will differ from network! to network. Note that we block both new-style and old-style broadcasts.access-list 101 deny udp any 172.16.0.255 0.0.255.0 eq 514access-list 101 deny udp any 172.16.0.0 0.0.255.0 eq 514! Deny packets sent to the addresses of our own network interfaces.access-list 101 deny udp any host 172.16.1.1 eq 514access-list 101 deny udp any host 172.16.2.1 eq 514access-list 101 deny udp any host 172.16.3.3 eq 514! Permit all other traffic (default would be to deny)access-list 101 permit ip any any! Apply the access list to the input side of each interfaceinterface ethernet 0ip address 172.16.1.1 255.255.255.0ip access-group 101 ininterface ethernet 2ip address 172.16.2.1 255.255.255.0ip access-group 101 ininterface ethernet 3ip address 172.16.3.3 255.255.255.0ip access-group 101 inListing all possible addresses—especially all possible broadcast addresses—to which attack packets may be sent is complicated. If you do not need to forward any legitimate syslog traffic received on an interface, you can block all syslog traffic arriving on that interface. Remember that blocking will affect traffic routed through the Cisco IOS device as well as traffic destined to the device; if the IOS device is expected to forward syslog packets, you will have to do the detailed filtering. Because input access lists impact system performance, install them with caution—especially on systems running very near their capacity.
Software Versions and Fixes
Many Cisco software images have been or will be specially reissued to correct this vulnerability. For example, regular released version 12.0(2) is vulnerable, as are interim releases 12.0(2.1) through 12.0(2.3). The first fixed interim version of 12.0 mainline software is 12.0(2.4). However, a special release, 12.0(2a), contains only the fix for this vulnerability and does not include any other bug fixes from later 12.0 interim releases.
If you are running 12.0(2) and want to fix this problem without risking possible instability presented by installing the 12.0(2.4) interim release, you can upgrade to 12.0(2a). Release 12.0(2a) is a "code branch" from the 12.0(2) base, which will merge back into the 12.0 mainline at 12.0(2.4).
Special releases, like 12.0(2a), are one-time, spot fixes, and they will not be maintained. Thus, the upgrade path from12.0(2a) is to 12.0(3).
specifies information about affected and repaired software releases.
Note
Table 6 Affected and Repaired Software Releases
11.2 and earlier releases—all variants
Unaffected early releases (no syslog server)
Unaffected
Unaffected
Unaffected
11.3, 11.3 T, 11.3 DA, 11.3 MA, 11.3 NA, 11.3 WA, 11.3(2)XA
11.3 releases without syslog servers
Unaffected
Unaffected
Unaffected
11.3 AA
11.3 early deployment for AS58xx
11.3(7)AA2, 8-JAN-19994
11.3(7.2)AA
11.3(8)AA, 15-FEB-1999
11.3 DB
11.3 for Cisco NRP routing blade in Cisco 6400 xDSL DSLAM
11.3(7)DB2, 18-JAN-1999
12.0
12.0 Mainline
12.0(2a), 8-JAN-1999
12.0(2.4)
12.0(4), 12-APR-1999
12.0 T
12.0 new technology early deployment
12.0(2a)T1, 11-JAN-1999
12.0(2.4)T
12.0(3)T, 15-FEB-1999
12.0 S
ISP support; 7200, RSP, GSR
12.0(2.3)S, 27-DEC-1998
12.0(2)S5 , 18-JAN-1999
12.0 DB
12.0 for Cisco 6400 universal access concentrator node switch processor (lab use)
12.0(2)DB, 18-JAN-1999
12.0(1)W
12.0 for Catalyst 8500 and LS1010
12.0(1)W5(5a) and 12.0(1a)W5(5b) (LS1010 platform only)
12.0(1)W5(5.15)
12.0(1)W5(6) (platform support for Catalyst 8540M will be in 12.0(1)W5(7))
12.0(0.6)W5
One-time early deployment for CH-OC12 module in Catalyst 8500 series switches
Unaffected; one-time release
Unaffected
Unaffected; To upgrade use 12.0(1)W5 releases.
12.0(1)XA3
Short-life release; merged to 12/0T at 12.0(2)T
Obsolete
Merged
Upgrade to 12.0(2a)T1 or to 12.0(3)T.
12.0(1)XB
Short-life release for Cisco 800 series; merged to 12.0 T and 12.0 (3)T
12.0(1)XB1
Merged
Upgrade to 12.0(3)T.
12.0(2)XC
Short-life release for new features in Cisco 2600, Cisco 3600, ubr7200, ubr900 series; merged to 12.0 T at 12.0(3)T
12.0(2)XC1, 7-JAN-1999
Merged
Upgrade to 12.0(3)T
12.0(2)XD
Short-life release for ISDN voice features; merged to 12.0 T at 12.0(3)T
12.0(2)XD1, 18-JAN-1999
Merged
Upgrade to 12.0(3)T
12.0(1)XE
Short-life release
12.0(2)XE, 18-JAN-1999
Merged
Upgrade to 12.0(3)T
1 A special fix is a one-time release that provides the most stable immediate upgrade path.
2 Interim releases are tested less rigorously than regular maintenance releases; interim releases can contain serious bugs.
3 Fixed maintenance releases are on a long-term upgrade path. Other long-term upgrade paths also exist.
4 All dates in this table are estimates and are subject to change.
5 This entry is not a misprint. The 12.0(2.3)S interim release is available before the 12.0(2)S regular release.
Deprecated MIBs
Old Cisco Management Information Bases (MIBs) will be replaced in a future release. OLD-CISCO-* MIBS are currently being migrated 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 the following table.
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious.
For information on caveats in Cisco IOS Release 11.3 T, refer to the Caveats for Cisco IOS Release 11.3 T document. This document lists severity 1 and 2 caveats for all releases of Cisco IOS Release 11.3 T. The caveats document is located on CCO and the Documentation CD-ROM.
Because Cisco IOS Release 11.3 T is based on Cisco IOS Release 11.3, all caveats in Release 11.3 are also in Release 11.3 T. For information on caveats in Cisco IOS Release 11.3, refer to the "Important Notes and Caveats for Release 11.3" section in the cross-platform Release Notes for Cisco IOS Release 11.3 document which is located on CCO and the Documentation CD-ROM. These release notes list severity 1 and 2 caveats affecting all maintenance releases.
Note
Related Documentation
This section describes the documentation available for the Cisco uBR7246. These documents consist of hardware and software installation guides, Cisco IOS configuration and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are only available online on CCO and on the Documentation CD-ROM.
Use these release notes with the documents listed in the following sections:
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Release-Specific Documents
The following documents are specific to Release 11.3. They are located on CCO and the Documentation CD-ROM:
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To reach the cross-platform Release Notes for Cisco IOS Release 11.3 from the CCO home page, click on this path:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 11.3: Product-Specific Release Notes for Cisco IOS Release 11.3
To reach the cross-platform Release Notes for Cisco IOS Release 11.3 on the Documentation CD-ROM, click on this path:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 11.3: Product Specific Release Notes for Cisco IOS Release 11.3: Cross-Platform Release Notes for Cisco IOS Release 11.3
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To reach these documents from the CCO home page, click on this path:
Service & Support: Technical Documents
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As a supplement to the caveats listed in the "Caveats" section of these release notes, refer to the Caveats for Cisco IOS Release 11.3 T document, which contains caveats applicable to all platforms for all maintenance releases of Release 11.3 T.
To reach the Caveats document from CCO, click on this path:
Service & Support: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 11.3: Caveats for Cisco IOS Release 11.3 T
To reach the Caveats document on the Documentation CD-ROM, click on this path:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 11.3: Caveats for Cisco IOS Release 11.3 T
Note
Platform-Specific Documents
The documents listed in this section are available for the Cisco uBR7246 and Cisco uBR904.
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To reach Cisco uBR7200 and Cisco uBR900 series documentation on CCO, follow this path:
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