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Release Notes for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for Cisco IOS Release 12.4(16)MR1

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Release Notes for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for Cisco IOS Release 12.4(16)MR1

Table Of Contents

Release Notes for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for Cisco IOS Release 12.4(16)MR1

Contents

Introduction

System Configuration Requirements

Memory Recommendations

Determining the Software Version

Upgrading to a New Software Release

New and Changed Information

New Features in Cisco IOS Release 12.4(16)MR1 Software

New Features in Cisco IOS Release 12.4(16)MR Software

New Features in Cisco IOS Release 12.4(12)MR2 Software

New Features in Cisco IOS Release 12.4(12)MR1 Software

New Features in Cisco IOS Release 12.4(12)MR Software

New Features in Cisco IOS Release 12.4(11)MR Software

New Features in Cisco IOS Release 12.4(9)MR Software

New Features in Cisco IOS Release 12.4(6)MR1 Software

New Features in Cisco IOS Release 12.4(6)MR Software

New Features in Cisco IOS Release 12.4(4)MR1 Software

New Features in Cisco IOS Release 12.4(4)MR Software

New Features in Cisco IOS Release 12.4(2)MR1 Software

New Features in Cisco IOS Release 12.4(2)MR Software

Limitations, Restrictions, and Notes

Unsupported Hardware—Cisco MWR 1941-DC-A Router

Caveats in Cisco IOS Release 12.4(16)MR1

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(16)MR

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(12)MR2

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(12)MR1

Open Caveats

Resolved Caveats

Software Replacement Recommendations [for what? make clearer]

Caveats in Cisco IOS Release 12.4(12)MR

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(11)MR

Open Caveats

Caveats in Cisco IOS Release 12.4(9)MR

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(6)MR1

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(6)MR

Open Caveats

Caveats in Cisco IOS Release 12.4(4)MR1

Resolved Caveats

Caveats in Cisco IOS Release 12.4(4)MR

Open Caveats

Resolved Caveats

Caveats in Cisco IOS Release 12.4(2)MR1

Resolved Caveats

Caveats in Cisco IOS Release 12.4(2)MR

Troubleshooting

Related Documentation

Cisco Mobile Wireless RAN-O

Obtaining Documentation, Obtaining Support, and Security Guidelines


Release Notes for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for Cisco IOS Release 12.4(16)MR1


January 11, 2008

These release notes are for the Cisco MWR 1941-DC-A Mobile Wireless Edge Router for Cisco IOS Release 12.4(16)MR1. Cisco IOS Release 12.4(16)MR1 is required to deploy the Cisco MWR 1941-DC-A router in a radio access network optimization (RAN-O) solution.

These release notes are updated to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode and related documents.

For a list of the software caveats that apply to Cisco IOS Release 12.4(16)MR1, see the "Caveats in Cisco IOS Release 12.4(16)MR1" section. To review the release notes for Cisco IOS Release 12.4, go to www.cisco.com. Click the Support tab and select Select a Product from the drop-down menu. Under Select a category, click Cisco IOS Software. Under Select a sub-category, click Cisco IOS Software Release 12.4 Family. Under Select a product, click Cisco IOS Software Releases 12.4 Mainline. Under General Information, click Release Notes > Cross-Platform Release Notes for Cisco IOS Release 12.4, Part 5: Caveats.

Contents

This document contains the following sections:

Introduction

System Configuration Requirements

New and Changed Information

New Features in Cisco IOS Release 12.4(16)MR1 Software

New Features in Cisco IOS Release 12.4(16)MR Software

New Features in Cisco IOS Release 12.4(12)MR2 Software

New Features in Cisco IOS Release 12.4(12)MR1 Software

New Features in Cisco IOS Release 12.4(11)MR Software

New Features in Cisco IOS Release 12.4(9)MR Software

New Features in Cisco IOS Release 12.4(6)MR1 Software

New Features in Cisco IOS Release 12.4(6)MR Software

New Features in Cisco IOS Release 12.4(4)MR1 Software

New Features in Cisco IOS Release 12.4(4)MR Software

New Features in Cisco IOS Release 12.4(2)MR1 Software

New Features in Cisco IOS Release 12.4(2)MR Software

Limitations, Restrictions, and Notes

Caveats in Cisco IOS Release 12.4(16)MR1

Caveats in Cisco IOS Release 12.4(16)MR

Caveats in Cisco IOS Release 12.4(12)MR2

Caveats in Cisco IOS Release 12.4(12)MR1

Caveats in Cisco IOS Release 12.4(11)MR

Caveats in Cisco IOS Release 12.4(9)MR

Caveats in Cisco IOS Release 12.4(6)MR1

Caveats in Cisco IOS Release 12.4(6)MR

Caveats in Cisco IOS Release 12.4(4)MR1

Caveats in Cisco IOS Release 12.4(2)MR1

Caveats in Cisco IOS Release 12.4(2)MR

Troubleshooting

Obtaining Documentation, Obtaining Support, and Security Guidelines

Introduction

With Cisco IOS Release 12.4(2)MR and later, the Cisco MWR 1941-DC-A router can be used in a Cisco radio access network optimization (RAN-O) environment. The Cisco RAN-O feature provides:

Global System for Mobile Communication (GSM) Abis Optimization over IP and

Universal Mobile Telecommunication System (UMTS) Iub Optimization over IP

This feature enables bandwidth efficient transport of GSM and UMTS traffic between the Base Transceiver Station (BTS) and the Base Station Controller (BSC) in GSM RANs, and between Node B and Radio Network Controllers (RNC) in UMTS RANs. This results in significant reductions in operating expenditures to the mobile wireless operator and enables new revenue-generating services for the future.

System Configuration Requirements

When being implemented in an RAN-O solution, the Cisco MWR 1941-DC-A router requires the minimum following system configuration:

Cisco IOS Release 12.4(2)MR software or later.

Redundancy—Standalone Mode

The MWR 1941-DC-A router must be configured to operate in standalone mode. The standalone option must be configured from redundancy mode.

To manually set the relays to open or closed, perform the following steps beginning in global configuration mode:


Step 1 Enter redundancy mode.

Router(config)# redundancy

Step 2 Enter the y-cable mode.

Router(config-r)# mode y-cable

Step 3 Specify that the router is to be used as a stand-alone device. This command closes the relays.

Router(config-r-y)# standalone 

Step 4 Exit y-mode configuration mode.

Router(config-r-y)# exit

To verify the status of the relays on an MWR 1941-DC-A router, use the show controllers command.


Memory Recommendations

Table 1 lists the required memory for using this software.

Table 1 Cisco IOS Release 12.4(16)MR1 Memory Recommendations

Platform
Feature Set
Software Image
Flash Memory Recommended
DRAM Memory Recommended
Runs From

Cisco MWR 1941-DC-A Mobile Wireless Edge Router

RAN Optimization

mwr1941-iprank9-mz

128 MB

256 MB

RAM

Cisco MWR 1941-DC-A Mobile Wireless Edge Router

Adv IP Series

mwr1941-adviprank9-mz

128 MB

256 MB

RAM


Determining the Software Version

To determine the image and version of Cisco IOS software running on your Cisco MWR 1941-DC-A router, log in to the Cisco MWR 1941-DC-A and enter the show version EXEC command:

router> show version
     Cisco Internetwork Operating System Software
	IOS (tm) 1900 Software (MWR1941-IPRANK9-MZ), Version 12.4(16)MR1, EARLY DEPLOYMENT 
	RELEASE SOFTWARE (fcl)

Upgrading to a New Software Release

For general information about upgrading to a new software release, refer to Software Installation and Upgrade Procedures located at the following URL:

http://www.cisco.com/en/US/products/hw/routers/tsd_products_support_category_home.html

New and Changed Information

The following sections list new hardware and software features supported by the Cisco MWR 1941-DC-A router.

New Features in Cisco IOS Release 12.4(16)MR1 Software

In Cisco IOS Release 12.4(16)MR1, the Cisco MWR 1941-DC-A router supports the following:

Up to 10 ATM ports in an IMA group with the AIM-ATM-8

New Features in Cisco IOS Release 12.4(16)MR Software

In Cisco IOS Release 12.4(16)MR, the Cisco MWR 1941-DC-A router supports three additional Cisco network interface cards:

NM-16ESW

NM-1A-T3

NM-1A-OC-3SMI

Also, with Cisco IOS Release 12.4(16)MR software, the Cisco MWR 1941-DC-A router supports RFC 4448—Encapsulation Methods for Transport of Ethernet over MPLS Networks.

New Features in Cisco IOS Release 12.4(12)MR2 Software

In Cisco IOS Release 12.4(12)MR2, the Cisco MWR 1941-DC-A router supports the following:

RFC 4717—ATM over MPLS

RFC 4454—ATM over L2TPv3

RFC 4023—MPLS over GRE

RFC 4553—Structure-Agnostic TDM over Packet (SAToP)

draft-ietf-pwe3-cespsn—Structure-aware TDM Circuit Emulation Service over Packet-Switched Network (CESoPSN)

New Features in Cisco IOS Release 12.4(12)MR1 Software

No new features are supported by the Cisco MWR 1941-DC-A router for Cisco IOS Release 12.4(12)MR1.

New Features in Cisco IOS Release 12.4(12)MR Software

In Cisco IOS Release 12.4(12)MR, the Cisco MWR 1941-DC-A router supports the following:

New show umts traffic and show gsm traffic commands

Only application bytes (below UDP header) calculate show umts traffic and show gsm traffic commands

Built-in (fixed) high performance advanced integration module for ATM (AIM-ATM-8) daughter card that provides support for up to eight independent ATM links or four Inverse Multiplexing for ATM (IMA) groups

New Features in Cisco IOS Release 12.4(11)MR Software

In Cisco IOS Release 12.4(11)MR, the Cisco MWR 1941-DC-A router supports the following:

K9 image

Secure Shell (SSH)

New Features in Cisco IOS Release 12.4(9)MR Software

In Cisco IOS Release 12.4(9)MR, the Cisco MWR 1941-DC-A router supports three Cisco network interface cards:

VWIC-2MFT-T1-DIR

VWIC-2MFT-E1-DIR

WIC-2A/S

Also, in Cisco IOS Release 12.4(9)MR software, L2TPv3 is supported.

New Features in Cisco IOS Release 12.4(6)MR1 Software

No new features are supported by the Cisco MWR 1941-DC-A router for Cisco IOS Release 12.4(6)MR1.

New Features in Cisco IOS Release 12.4(6)MR Software

The following features are implemented in Cisco IOS Release 12.4(6)MR and later releases:

See Release Notes for Cisco 3845 Series Integrated Services Router in a RAN-O for Cisco IOS Release 12.4(6)MR

New Features in Cisco IOS Release 12.4(4)MR1 Software

The following new features are implemented in Cisco IOS 12.4(4)MR1 and later releases:

UMTS Congestion Management Control—Implemented in Cisco IOS Release 12.4(4)MR1. Allows you to configure the UMTS congestion based on priority. Two new commands (umts-iub congestion priority and umts-iub congestion-control) are added using the PVC Configuration mode and the Interface Configuration mode, respectively (for detailed command information, see the Cisco MWR 1941-DC-A Mobile Wireless Router Software Configuration Guide, Appendix A).

New Features in Cisco IOS Release 12.4(4)MR Software

The following new features are implemented in Cisco IOS 12.4(4)MR and later releases:

Inverse Multiplexing for ATM (IMA)—As a shorthaul, you can now configure existing UMTS commands on IMA interfaces. No new commands are added for this new feature. Only previously existing Cisco IOS commands have been added for this feature (for detailed command information, see the Cisco MWR 1941-DC-A Mobile Wireless Router Software Configuration Guide, Appendix A).

Permanent Virtual Circuit (PVC) Routing—allows you to offload PVC traffic from a physical ATM shorthaul to an alternate backhaul. For each alternate backhaul, you must create a logical shorthaul by creating an ATM subinterface. Traffic from the PVCs configured under this logical shorthaul go through the corresponding alternate backhaul. Three new commands are added using Subinterface Configuration mode for this new feature: atm umts, umts local, and umts remote (for detailed command information, see the Cisco MWR 1941-DC-A Mobile Wireless Router Software Configuration Guide, Appendix A).

UMTS QoS—Three new commands are added using the Interface Configuration mode for this new feature: umts-iub set dscp, umts-iub set peering dscp, and gsm-abis set dscp and one new ATM-VC Interface Configuration command: umts-iub set dscp (for detailed command information, see the Cisco MWR 1941-DC-A Mobile Wireless Router Software Configuration Guide, Appendix A). These new commands allow you to perform the following:

UMTS Shorthaul Interface:

- Set the default description value to tag the backhaul packet including peering and data generated from the shorthaul in a UMTS Iub configuration.

- Set the description value in the UMTS Iub configuration such that it overwrites the default value defined previously. It is also used to tag the peering backhaul packet.

PVC of a UMTS Shorthaul Interface—Set the description value in the UMTS Iub configuration to overwrite the default value defined previously. It is also used to tag the backhaul packet generated from traffic from the PVC.

GSM Shorthaul Interface—Set the description value to tag all the backhaul packets generated from the shorthaul in the GSM Abis interface.

New Features in Cisco IOS Release 12.4(2)MR1 Software

In Cisco IOS Release 12.4(2)MR1, the Cisco MWR 1941-DC-A router supports the following MIB:

CISCO-IP-RAN-BACKHAUL-MIB—This MIB is compatible with Cisco Mobile Wireless Transport Manager (MWTM) 5.0 or later.

New Features in Cisco IOS Release 12.4(2)MR Software

In Cisco IOS Release 12.4(2)MR, the Cisco MWR 1941-DC-A router supports the following Cisco network modules and interface cards:

Cisco 2-Port T1/E1-RAN Interface Card (VWIC)—Cisco 2-port T1/E1-RAN interface card: VWIC-2T1/E1-RAN

Cisco Network Modules—Network Module with two WIC slots and no LAN (Ethernet/Fast Ethernet) ports: NM-2W

Limitations, Restrictions, and Notes


Caution The Cisco MWR 1941-DC-A router does not support online insertion and removal (OIR) of WAN interface cards. Any attempt to perform OIR on a card in a powered-on router might cause damage to the card.


Caution The Cisco MWR 1941-DC-A router does not support online insertion and removal (OIR) of network modules. Any attempt to perform OIR on a card in a powered up router might cause damage to the card.

Unsupported Hardware—Cisco MWR 1941-DC-A Router

Use of additional interface cards: The only supported interface cards are the following:

VWIC-2T1/2E-RAN

VWIC-2MFT-T1-DIR

VWIC-2MFT-E1-DIR

WIC-2A/S

Caveats in Cisco IOS Release 12.4(16)MR1

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(16)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

This section documents possible unexpected behavior by Cisco IOS Release 12.4(16)MR1 and describes only severity 1 and 2 caveats and selected severity 3 caveats.

CSCsl27667:

Description: MWR uses only the first 16 bits of the assigned control connection ID AVP.

Workaround: There is no workaround for the 12.4(16)MR1 image.

Resolved Caveats

CSCsk53991:

Description: ISR ATM cell switching feature is broken.

Workaround: There is no workaround for the 12.4(16)MR image and prior images.

Caveats in Cisco IOS Release 12.4(16)MR

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(16)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(16)MR.

Resolved Caveats

All the caveats listed in this section are resolved in Cisco IOS Release 12.4(16)MR. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCsk61916

Description: There is no recovery after a slower link in the MLP bundle resets.

One of the two links in an MLP bundle is 8 ms slower. If the slower link arrives first (expected sequence number is slower link), the MLP bundle functions as expected. But when the slower link resets so that the fast link becomes primary (expected sequence number is faster link), fragments are dropped as lost even though they eventually arrive. This condition is known as lost received increments, which requires manual intervention to recover. For example, resetting the fast link.

Workaround: To void this, Configure ppp link reorders on the member links. This command has the effect of disabling the normal lost fragment detection logic, so it may also be advisable to configure a lower lost fragment timeout value using the command ppp timeout multilink lost fragment to detect lost fragments more quickly.

Caveats in Cisco IOS Release 12.4(12)MR2

The following sections list and describe the resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(12)MR2. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(12)MR2.

Resolved Caveats

No resolved caveats exist in Cisco IOS Release 12.4(12)MR2.

Caveats in Cisco IOS Release 12.4(12)MR1

The following sections list and describe the resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(12)MR1. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(12)MR1.

Resolved Caveats

All caveats listed in this section are resolved in Cisco IOS Release 12.4(12)MR1. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCsi13687

Description: If all GSM-Abis shorthaul interfaces are down, the router may stop responding in interrupt processing. Console/Telnet access to the router may be limited (or not possible). The router may return to normal after 1 to 2 minutes.

Workaround: There is no workaround for the Release 12.4(12)MR image. The Cisco MWR 1941-DC-A router must be power-cycled and booted with the Release 12.4(12)MR 1 image to recover.


Caution To increase network availability, we recommend that you upgrade affected images with the suggested replacement software images. We will discontinue manufacturing shipment of affected images. Any pending order is substituted by the replacement software images.

Be aware that failure to upgrade the affected images may result in network downtime.

The terms and conditions that governed your rights and obligations and those of Cisco, with respect to the deferred images will apply to the replacement images.

Software Replacement Recommendations [for what? make clearer]

Table 2 lists......

Table 2 Affected Software and Replacement Solution

Software Affected
Software Solution
OS Type
Version
Software
Version
Software
Availability
(mm/dd/yyyy)

IOS

12.4(12)MR

mwr1941-iprank9-mz

12.4(12)MR1

mwr1941-iprank9-mz

3/23/07


Caveats in Cisco IOS Release 12.4(12)MR

The following sections list and describe the resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(12)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

This section documents possible unexpected behavior by Cisco IOS Release 12.4(12)MR and describes only severity 1 and 2 caveats and selected severity 3 caveats.

CSCsi13687

Description: If all GSM-Abis shorthaul interfaces are down, the router may stop responding in interrupt processing. Console/Telnet access to the router may be limited (or not possible). The router may return to normal after 1 to 2 minutes.

Workaround: There is no workaround for this problem if the last active GSM-Abis interface goes down without operator intervention (peer router reloads, local controller goes down). If the operator is removing the last active GSM-Abis interface via configuration, the problem can be avoided by manual shutdown of the E1 controller.

controller e1 0/3
shut
no channel-group <channel-group-number>

Resolved Caveats

The caveat listed in this section is resolved in Cisco IOS Release 12.4(12)MR. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCsh54166

Description: If the clear umts-iub command is issued with an ATM interface specified, the command line interface access to all the UMTS commands becomes blocked.

Workaround: Do not use clear umts atm atm interface number command to clear UMTS statistics for just one peer. To clear UMTS statistics, use the clear umts-iub to clear statistics for all peers.

Caveats in Cisco IOS Release 12.4(11)MR

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(11)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

This section documents possible unexpected behavior by Cisco IOS Release 12.4(11)MR and describes only severity 1 and 2 caveats and selected severity 3 caveats.

CSCsh54166

Description: Error to acquire umts parser read lock. If clear umts-iub command is issued with a specific interface, CLI access to all umts commands gets blocked.

Workaround: Do not use clear umts atm x/y to clear umts stats for just one peer. To clear umts stats, enter the clear umts command to clear stats for all peers.

Caveats in Cisco IOS Release 12.4(9)MR

The following sections list and describe the resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(9)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(9)MR.

Resolved Caveats

Caveats listed in this section are resolved in Cisco IOS Release 12.4(9)MR. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCsc04185

Description: The cirbhCongestionDuration counter in the cirbhCongestionTable resets when clear umts on device is issued.

Workaround: There is no workaround for the Cisco IOS Release 12.4(6)MR image.

CSCsc04788

Description: The dscp value changed over MLP configured with IPHC, QoS, and LFi. With MLP IPHC configured in IPHC format, the receiver side IPHC drops packets. With MLP IPHC configured as either the IPHC or IETF forma, the number of dscp 8 packets at the receiver side does not match the number of dscp 8 packet at the sender side. The same problem applies for dscp 16 packets.

Workaround: There is no workaround for the Cisco IOS Release 12.4(6)MR image.

CSCsf15013

Description: The cirbhCongestionDuration counter resets when clear umts on device. While testing the UMTS congestion control, an adjacent MWR cell site router got hung up in the congestion control mode. It constantly throttled cells (at a slow rate), and the congestion timer display for show umts cong was incrementing. Turning off all GSM & UMTS traffic streams did not change this strange condition.

Workaround: There is no workaround for the Cisco IOS Release 12.4(6)MR image.

CSCsg56935

Description: When mixed GSM and UMTS traffic is run on an MLPPP backhaul and the UMTS traffic utilization is over 60 percent of the total MLPPP backhaul, then GSM errors are seen and GSM packets may not arrive in a timely manner. This happens for the default value of the GSM jitter (4 milliseconds) and a UMTS backhaul MTU of 450 bytes.

Workaround: Recommended configuration changes for such deployments are as follows:

Increase the GSM jitter buffer to a higher value, such as from the default value of 2.

Reduce the maximum transmission unit (MTU) of the UMTS backhaul to produce a side effect of a slightly greater CPU utilization.

Either or both of the workaround configuration changes will fix the problem. A user can choose the option that best fits the particular deployment and traffic requirements.

Commands: The following commands are available for the above workaround:

Router(config-if)#gsm-abis jitter ?

<4-2000> transmit jitter (in milliseconds)

Router(config-if)#umts-iub backhaul-mtu ?

<250-4440> mtu in byte

Caveats in Cisco IOS Release 12.4(6)MR1

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(6)MR1. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(6)MR1.

Resolved Caveats

Caveats listed in this section are resolved in Cisco IOS Release 12.4(6)MR.1 This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCek37177

Description: In certain versions of Cisco IOS software, the Cisco IOS Transmission Control Protocol (TCP) listener is vulnerable to a remotely-exploitable memory leak that may lead to a denial of service condition.

This vulnerability only applies to traffic traveling to the Cisco IOS device. Traffic transiting the Cisco IOS device does not trigger this vulnerability.

Workaround: Free software is available to address this vulnerability for affected customers.

This issue is documented as Cisco ID CSCek37177.

Workarounds are available to mitigate the effects of the vulnerability.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-tcp.shtml

CSCse51159

Description: The Cisco MWR 1941-DC-A router stalls during bootup after reporting the following message: %PA-2-UNDEFIO: Unsupported I/O Controller (type 1297) in I/O Bay. The I/O Controller network interfaces are unavailable.

This situation only occurs on the latest Cisco MWR1941-DC-A hardware with the Cisco IOS Release 12.4(6)MR image.

Workaround: There is no workaround for the Cisco IOS Release 12.4(6)MR image. The Cisco MWR 1941-DC-A router must be power-cycled and booted with older image to recover.

Caveats in Cisco IOS Release 12.4(6)MR

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(6)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(6)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

No known open caveats exist in Cisco IOS Release 12.4(6)MR.

Caveats in Cisco IOS Release 12.4(4)MR1

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(4)MR1. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(2)MR1. For information on caveats in:

Cisco IOS Release 12.4, see Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T, see Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Resolved Caveats

This caveat is resolved in Cisco IOS Release 12.4(4)MR1.

CSCsc00700

Description: When the mwr1941-ipran-mz.THROTTLE_V124_4_MR1_01 connects to the mwr1941-ipran-mz. 124-4.MR, error messages appear and peering is not established.

Workaround: Upgrade software at both ends of a link at the same time or do not configure timeslot 31 in the channel group.

Caveats in Cisco IOS Release 12.4(4)MR

The following sections list resolved and open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(4)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(2)MR1. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Open Caveats

This section documents possible unexpected behavior by Cisco IOS Release 12.4(4)MR and describes only severity 1 and 2 caveats and selected severity 3 caveats.

CSCsc22721

Description: Corrupted memory occurs when you configure all UMTS traffic traveling to a best-effort queue.

Workaround: Always configure UMTS traffic in the high priority queue.

Resolved Caveats

All the caveats listed in this section are resolved in Cisco IOS Release 12.4(4)MR. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCsb09661

Description: When booting the Cisco MWR 1941-DC-A router, sometimes the controller on the Cisco 2-port T1/E1-RAN card does not come up. The controller stays down even after a reboot.

Workaround: Disconnect the interface cables to the Cisco 2-port T1/E1-RAN card and then re-connect them.

CSCsb62772

Description: The IMA UMTS interface does not pass any traffic when one of the links is down. This occurs while the IMA interface is down when there are no E1 controller alarms indicated.

Workaround: Remove link from IMA group.

Caveats in Cisco IOS Release 12.4(2)MR1

The following sections list open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(2)MR1. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(2)MR1. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Resolved Caveats

Caveats listed in this section are resolved in Cisco IOS Release 12.4(2)MR1. This section describes only severity 1 and 2 caveats and select severity 3 caveats.

CSCei61732

Cisco IOS software may permit arbitrary code execution after exploitation of a heap-based buffer overflow vulnerability. Additional integrity checks exist in the software, as further described below, that reduce the likelihood of arbitrary code execution.

Free software is available that includes the additional integrity checks for affected customers.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20051102-timers.shtml

Caveats in Cisco IOS Release 12.4(2)MR

The following sections list and describe the open caveats for the Cisco MWR 1941-DC-A router running Cisco IOS Release 12.4(2)MR. Only severity 1 through 3 caveats are included.

Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious of these three severity levels.

Caveats in Cisco IOS Releases 12.4 and 12.4T are also in Cisco IOS Release 12.4(2)MR. For information on caveats in:

Cisco IOS Release 12.4—See Caveats for Cisco IOS Release 12.4

Cisco IOS Release 12.4T—See Caveats for Cisco IOS Release 12.4T

These two documents list severity 1 and 2 caveats and are located on CCO and the Documentation DVD.


Note If you have an account with Cisco.com, you can use Bug Navigator II to find caveats of any severity for any release. To reach Bug Navigator II, go to Cisco.com. Click the Support tab and select Support from the drop-down menu. Under Frequently Used Resources, click Bug Toolkit. You will then need to log in. Another option is to go directly to http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl.


Troubleshooting

Collecting Data for Router Issues

To collect data for reporting router issues, issue the following command:

show tech-support—Displays general information about the router when it reports a problem.

Collecting Data for ROMmon Issues

To collect data for ROMmon issues, issue the following command while in EXEC mode:

showmon—Displays currently selected ROM monitor.

Related Documentation

These documents are available for implementing the Cisco MWR 1941-DC-A Mobile Wireless Edge Router in a RAN-O and are available on Cisco.com and the Documentation DVD:

Cisco Mobile Wireless RAN-O

http://www.cisco.com/en/US/products/hw/routers/ps4062/tsd_products_support_series_home.html

Cisco MWR 1941 Mobile Wireless Edge Router Documents

Cisco MWR 1941-DC-A Mobile Wireless Edge Router Software Configuration Guide

Cisco MWR 1941-DC-A Mobile Wireless Edge Router Rack Mounting Instructions

Cisco Network Modules Installation Guides

Network Modules Quick Start Guide

Cisco Network Modules Hardware Installation Guide

Cisco Interface Cards Installation Guides

Quick Start Guide: Interface Cards

Cisco Interface Cards Installation Guide

Cisco 2-Port T1/E1-RAN Installation Instructions

Release Notes

On Cisco.com at:

Technical Support & Documentation: Routers: Cisco MWR 1900 Mobile Wireless Routers

On the Documentation DVD at:

Technical Support & Documentation: Routers: Cisco MWR 1900 Mobile Wireless Routers


Note To be sure of obtaining the latest information, access the online documentation.


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