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Cisco IOS Software Releases 12.2 Special and Early Deployments

Cisco 2600 Series - Cisco IOS Release 12.2(8)YN

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Release Notes for Cisco 2600 Series Routers for Cisco IOS Release 12.2(8) YN1

Table Of Contents

Release Notes for Cisco 2600 Series Routers for Cisco IOS Release 12.2(8) YN1

Contents

Inheritance Information

System Requirements

Memory Recommendations

Feature Set Tables

New and Changed Information

New Hardware and Software Features in Cisco IOS Release 12.2(8)YN1

New Hardware Features in Cisco IOS Release 12.2(8)YN

New Software Features in Cisco IOS Release 12.2(8)YN

ATM Cell Loss Priority (CLP) Bit Marking

Bundling of ATM Interfaces Using MLPPP

Compressed Real-Time Transport Protocol

Tunable Tx-Ring Buffer

Frame Relay - FRF.5 and FRF.8

Caveats for Cisco IOS Release 12.2(8) YN

Open Caveats—Cisco IOS Release 12.2(8) YN1

Resolved Caveats—Cisco IOS Release 12.2(8) YN1

Open Caveats—Cisco IOS Release 12.2(8) YN

Resolved Caveats—Cisco IOS Release 12.2(8) YN


Release Notes for Cisco 2600 Series Routers for Cisco IOS Release 12.2(8) YN1


January 27, 2003

Cisco IOS Release 12.2(8) YN1

OL-3463-01-A0

These release notes for the Cisco 2600 series routers describe the enhancements provided in Cisco IOS Release 12.2(8) YN1. These release notes are updated as needed.

For a list of the software caveats that apply to Cisco IOS Release 12.2(8) YN, see the "Caveats for Cisco IOS Release 12.2(8) YN" section and Caveats for Cisco IOS Release 12.2 T. The caveats document is updated for every maintenance release and is located on Cisco.com and the Documentation CD-ROM.

Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.2 T located on Cisco.com and the Documentation CD-ROM.

Cisco recommends that you view the field notices for this release to see if your software or hardware platforms are affected. If you have an account on Cisco.com, you can find field notices at http://www.cisco.com/kobayashi/support/tac/fn_index.html. If you do not have a Cisco.com login account, you can find field notices at http://www.cisco.com/kobayashi/support/tac/fn_index.html

Contents

These release notes describe the following topics:

Inheritance Information

System Requirements

New and Changed Information

Caveats for Cisco IOS Release 12.2(8) YN

Inheritance Information

Cisco IOS Release 12.2(8) YN is based on Cisco IOS Release 12.2(8)T. All features in Cisco IOS Release 12.2(8)T are in Cisco IOS Release 12.2(8) YN.

Table 1 lists sections of the Cross-Platform Release Notes for Cisco IOS Release 12.2 T that apply to Cisco IOS Release 12.2(8) YN.

Table 1 References for the Cross-Platform Release Notes for Cisco IOS Release 12.2 T

Topic
Location

Introductory information about the Cisco 2600 series routers

Hardware Supported

Feature Set Tables

Other Firmware Code

Additional Notes for the Cisco 2600 Series Routers

Click Platform-Specific Information and Cisco 2600 Series Routers at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/ 122relnt/xprn122t/122tfeat.htm.

Determining the Software Version

Upgrading to a New Software Release

Click Cross-Platform System Requirements at http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/ 122relnt/xprn122t/122treqs.htm.

Feature Descriptions (New and Changed Information)

MIBs

Important Notes

Go to

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/ 122relnt/xprn122t/122tnewf.htm.

Related Documentation

Obtaining Documentation

Obtaining Technical Assistance

Go to http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/ 122relnt/xprn122t/122tdocs.htm.


System Requirements

This section describes the system requirements for Cisco IOS Release 12.2(8)YN and includes the following sections:

Memory Recommendations

Feature Set Tables

Memory Recommendations

Table 2 Memory Recommendations for the Cisco 2600 Series Routers 

Platforms
Feature Sets
Image Name
Software Image
Flash
Memory
Recommended
DRAM
Memory
Recommended
Runs
From
Cisco 2600XM

IOS IP/FW/IDS PLUS IPSEC 3DES

Cisco 2600 Series IOS IP/FW/IDS PLUS IPSEC 3DES

c2600-ik9o3s-mz

32MB

128MB

RAM

IOS IP PLUS

Cisco 2600 Series IOS IP PLUS

c2600-is-mz

32MB

96MB

RAM


Feature Set Tables

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 12.2(8) YN1 supports the same feature sets as Cisco IOS Release 12.2(8) T, but Cisco IOS Release 12.2(8) YN1 can include new features supported by the Cisco 2600 series routers.


Caution Cisco IOS images with strong encryption (including, but not limited to, 168-bit Triple Data Encryption Standard [3DES] data encryption feature sets) are subject to United States government export controls and have limited distribution. Strong encryption images to be installed outside the United States are likely to require an export license. Customer orders may be denied or subject to delay because of United States government regulations. When applicable, purchaser and user must obtain local import and use authorizations for all encryption strengths. Please contact your sales representative or distributor for more information, or send an e-mail to export@cisco.com.

Table 3 lists the features and feature sets supported by the Cisco 2600 series routers in Cisco IOS Release 12.2(8)YN1 and uses the following conventions:

Yes—The feature is supported in the software image.

No—The feature is not supported in the software image.

In—The number in the "In" column indicates the Cisco IOS release in which the feature was introduced. For example, "12.2(8)YN1" means a feature was introduced in Cisco IOS Release 12.2(8) YN1. If a cell in this column is empty, the feature was included in the initial base release.


Note These release notes are not cumulative and list only features that are new to Cisco IOS Release 12.2(8) YN1. The parent release for Cisco IOS Release 12.2(8) YN1 is Cisco IOS Release 12.2(8)T. For information about inherited features, refer to Cisco.com or Cisco Feature Navigator. For Cisco.com, go to http://www.cisco.com/univercd/home/index.htm, select the appropriate software release under Cisco IOS Software, and click Release Notes. If you have a Cisco.com login account, you can use the Cisco Feature Navigator tool at http://www.cisco.com/go/fn


Table 3 Feature List by Feature Set for the Cisco 2600 Series Routers 

Features
In
Software Images by Feature Sets
Cisco 2600 Series IOS IP/FW/IDS PLUS IPSEC 3DES
Cisco 2600 Series IOS IP PLUS

ATM Cell Loss Priority (CLP) Bit Marking

12.2(8)YN

Y

Y

Bundling of ATM interfaces using MLPPP

12.2(8)YN

Y

Y

Compressed Real-Time Transport Protocol

12.2(8)YN

Y

Y

Enhanced ITU-T G.168 Echo Cancellation

12.2(8)YN

Y

Y

Frame Relay - FRF.5 and FRF.8

12.2(8)YN

Y

Y

MLPPP Bundling - DSL Interfaces

12.2(8)YN

Y

Y

Tunable Tx-Ring Buffer

12.2(8)YN

Y

Y


New and Changed Information

The following sections list the new hardware and software features supported by the Cisco 2600 series routers for Cisco IOS Release 12.2(8) YN1.

New Hardware and Software Features in Cisco IOS Release 12.2(8)YN1

There are no new hardware or software features supported by the Cisco 2600 series routers for Cisco IOS Release 12.2(8)YN1.

New Hardware Features in Cisco IOS Release 12.2(8)YN

There are no new hardware features supported by the Cisco 2600 series routers for Cisco IOS Release 12.2(8)YN.

New Software Features in Cisco IOS Release 12.2(8)YN

The following new software features are supported by the Cisco 2600 series routers for Cisco IOS Release 12.2(8)YN.

ATM Cell Loss Priority (CLP) Bit Marking

When congestion occurs in an ATM network, ATM cells are discarded. One way to control which cells are discarded is to use cell loss priority (CLP) bit marking in the header of each cell. You can set the CLP bit to either 1 or 0. Those cells that have the CLP bit set to 1 are always discarded before any cells that have the CLP bit set to 0.The ATM CLP Bit Marking feature allows you to control the CLP setting on the Cisco routers. The marking of the CLP bit is implemented on a per-packet basis so that the CLP bit of every ATM cell that belongs to a particular packet is set to either 0 or 1.

Bundling of ATM Interfaces Using MLPPP

The Bundling of ATM Interfaces Using Multilink PPP (MLP) feature supports other quality of service (QoS) features, such as LLQ and CBWFQ and link fragmentation and interleaving (LFI). The bundling feature supports the other QoS features over a multilink MLP bundle for which members of the bundle are defined across physically different DSL interfaces. The bundling occurs at the ATM layer through ATM permanent virtual circuits (PVCs).

Compressed Real-Time Transport Protocol

The Real-Time Transport Protocol (RTP) feature, as described in RFC 1889, is used to carry real-time data for voice and video applications. For a typical Voice over IP (VoIP) application, the payload portion of the packet can be smaller than the header. For instance, using the G.729 codec, the payload is 20 bytes, but the IP, User Data Protocol (UDP), and RTP header is 40 bytes. Sending the IP, UDP, and RTP header across a slow link without compressing it is inefficient. The Compressed Real-Time Transport Protocol (cRTP) feature, as defined in RFC 2508, addresses this inefficiency by making smaller VoIP packet headers. The basic idea behind cRTP is that although several fields in the IP, UDP, and RTP header change from packet to packet, the difference in these fields from packet to packet is constant. The compression scheme in cRTP is to encode the header to reduce the size of information to be transmitted. With cRTP, a 40-byte IP, UDP, and RTP header of a VoIP packet can be compressed to 2 to 4 bytes per packet, yielding approximately 11.2 kbps of bandwidth for a G.729 codec call that uses RTP.

Tunable Tx-Ring Buffer

The transmission (tx) ring is the first-in, first-out (FIFO) buffer used to hold frames before transmission at the DSL driver level. The tx ring defines the maximum number of packets that can wait for transmission at Layer 2. The tx ring complements the ability of LLQ to minimize jitter and latency of voice packets. For maximum voice quality, use a low tx ring setting. For maximum data throughput, use a high tx ring setting. You can configure the size of the tx ring for each permanent virtual circuit (PVC). The default value is 60. However, the value of the setting can be 2 through 60 on Cisco 1700, Cisco 2600, and Cisco 3600 series routers. A low tx ring setting, such as 2 or 3, is required for latency-critical traffic. For example, when the tx ring limit is configured as 3 and LLQ is configured on the PVC, the worst case delay for a voice packet is the time required to transmit three data packets. When the buffering is reduced by configuring the tx ring limit, the delay for voice packets is reduced by a combination of the tx ring and LLQ mechanism.

Frame Relay - FRF.5 and FRF.8

To communicate over WANs, end-user stations and the network cloud typically must use the same type of transmission protocol. This limitation has prevented differing networks such as Frame Relay and ATM from being linked. The Frame Relay-to-ATM service interworking feature allows Frame Relay and ATM networks to exchange data despite differing network protocols. The functional requirements for linking Frame Relay and ATM networks are provided by the Frame Relay/ATM PVC Service Interworking Implementation Agreement specified in Frame Relay Forum (FRF) documents FRF.5 and FRF.8. The FRF.5 and FRF.8 interworking functions involve multiplexing PVCs between Frame Relay and ATM networks and mapping the control bits between Frame Relay frame headers and ATM cell headers. FRF.5 and FRF.8 are necessary for ATM-based features to interwork with Frame-Relay-based IP class of service features.

Caveats for Cisco IOS Release 12.2(8) YN

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only select severity 3 caveats are included in the caveats document.

This section contains open and resolved caveats for the current Cisco IOS maintenance release.

All caveats in Cisco IOS Release 12.2 and Cisco IOS Release 12.2 T that apply to the Cisco  2600 series routers are also in Cisco IOS Release 12.2(8) YN1.

For information on caveats in Cisco IOS Release 12.2, see Caveats for Cisco IOS Release 12.2.

For information on caveats in Cisco IOS Release 12.2 T, see Caveats for Cisco IOS Release 12.2 T, which lists severity 1 and 2 caveats and select severity 3 caveats and is located on Cisco.com and the Documentation CD-ROM.


Note If you have an account on Cisco.com, you can also use the Bug Toolkit to find select caveats of any severity. To reach the Bug Toolkit, log in to Cisco.com and click Service & Support: Software Center: Cisco IOS Software: BUG TOOLKIT. Another option is to go to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats—Cisco IOS Release 12.2(8) YN1

This section documents possible unexpected behavior by Cisco IOS Release 12.2(8) YN 1and describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCdt13023: Bus error crash due to TCP connection while router is out of mem

Symptom: A Cisco Router that has run out of processor memory may unexpectedly reload due to a bus error at an invalid address if there is an attempt to secure shell (SSH) into a vty port, which fails due to a process creation failure. A SYS-2-CFORKMEM error message will appear right before the restart.

Workaround: Disable SSH access to your router.

Resolved Caveats—Cisco IOS Release 12.2(8) YN1

All the caveats listed in this section are resolved in Cisco IOS Release 12.2(8) YN1 and describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCdz11128: SHDSL-F-DG: ATM ping fails with packets queued in FPGA

Symptom: For newly installed WIC-1SHDSL-FDG followed by a soft reload, ping may fail for this SHDSL ATM interface. This happens very rarely and can be solved by issuing a shutdown or no shutdown command on the interface. The cause for this is known now and a fix is to be implemented soon.

Workaround: Issue a shutdown or no shutdown command on the interface.

CSCdz63581: Setting Min Txring of 2 for 26xx/36xx/37xx on DSL in sync with 1700

Symptom: The minimum value of the TX ring that can be configured on a private virtual circuit (PVC) over a ADSL/G.SHDSL interface is changed to 2 on Cisco 2600, Cisco 3600, and Cisco 3700 platforms.

Workaround: There is no workaround.

CSCdy79301: SSG:EAPSIM:AZR sending the Accounting Records with wrong format MAC

The format of the MAC address of the wireless client in the calling-station-id field of the Accounting Start does not match the format of the MAC address in the calling-station-id field of the Access Requests. SSG is unable to correlate and create a host object. The host object is necessary for the solution to work. The same problem exists with the Accounting Stop.

CSCdy87221: CW2K hangs GSR when SSH enabled; crashes 7200 when SSH enabled

Certain Cisco products containing support for the Secure Shell (SSH) server are vulnerable to a Denial of Service (DoS) if the SSH server is enabled on the device. A malformed SSH packet directed at the affected device can cause a reload of the device. No authentication is necessary for the packet to be received by the affected device. The SSH server in Cisco IOS is disabled by default.

Cisco will be making free software available to correct the problem as soon as possible.

The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc. Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this vulnerability.

This advisory is available at the following URL:

http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml

CSCdu75477: Memory leak in SSH code

Certain Cisco products containing support for the Secure Shell (SSH) server are vulnerable to a Denial of Service (DoS) if the SSH server is enabled on the device. A malformed SSH packet directed at the affected device can cause a reload of the device. No authentication is necessary for the packet to be received by the affected device. The SSH server in Cisco IOS is disabled by default.

Cisco will be making free software available to correct the problem as soon as possible.

The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc. Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this vulnerability.

This advisory is available at the following URL:

http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml

Open Caveats—Cisco IOS Release 12.2(8) YN

This section documents possible unexpected behavior by Cisco IOS Release 12.2(8) YN and describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCdy63125: T1/E1 channel group clock rate is not shown in show controller ATM

Symptom: When using T1/E1 WICs, the serial interface created by configuring channel-group with T1/E1 is not reflected in the clock rate values when issuing show controller atm.

Workaround: There is no workaround.

CSCdy76221: DSL operating mode doesn't fall back to the configured mode

Symptom: G.SHDSL remains trained with previous operating mode after new mode is configured on the interface.

Workaround: Shut/no shut on the interface has to be issued to retrain.

CSCdy87266: Tx-ring-limit of 3 may degrade output while 4,5,..60 are ok

Symptom: Configuring tx-ring-limit as 3 may degrade output.

Workaround: Configure 4 and onwards until 60 for the tx-ring-limit. For lower latency, 4 is the preferred value until this DDTS is resolved.

Resolved Caveats—Cisco IOS Release 12.2(8) YN

Because Cisco IOS Release 12.2(8) YN1 is the initial base release, there are no resolved caveats. For a list of the resolved caveats, refer to the next set of release notes for this release version.