Table Of Contents
Release Notes for Cisco MWR 1941-DC Mobile Wireless Edge Router for Cisco IOS Release 12.2(15)MC1c
May 3, 2005
Cisco IOS Release 12.2(15)MC1c
These release notes are for the Cisco MWR 1941-DC Mobile Wireless Edge Router for Cisco IOS Release 12.2(15)MC1c.
These release notes are updated as needed 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 12.2(15)MC1c, see the "Caveats in Cisco IOS Release 12.2(15)MC1c" section. To review the release notes for Cisco IOS Release 12.2, go to www.cisco.com and click Technical Documentation. Select Release 12.2 from the Cisco IOS Software drop-down menu. Then click Cisco IOS Release Notes > Cisco IOS Release 12.2.
This document contains the following sections:
With Cisco IOS Release 12.2(15)MC1a and later, the MWR 1941-DC router can be used to extend a mobile operator's DCN to the cell site, providing the ability to remotely manage radio and cell site equipment remotely from the operations center.
A cell site DCN solution minimizes the need to dispatch technicians for every problem that might occur at the cell site by providing the ability to perform the following types of maintenance tasks remotely:
•routine maintenance of the cell site devices
Additionally, the MWR 1941-DC router cell site DCN implementation provides IP connectivity to the cell site, enabling the use of IP-related applications that provide operation support (for example, web camera for site surveillance, IP telephone for voice connectivity, and LAN extension to the cell site to provide remote access to network applications, data, and access to the Internet and/or intranet).
Cisco network modules and WAN interface cards used with the MWR 1941-DC router provide a variety of connectivity options at the cell site.
System Configuration Requirements
When being implemented in an Cell Site DCN solution, the Cisco MWR 1941-DC router requires the following system configuration:
•Cisco IOS Release 12.2(15) MC1a or later software be installed.
•Support of the NM-2FE2W-V2 requires Cisco IOS Release 12.2(15)MC1b or later.
•Network Time Protocol (NTP)
Network Time Protocol must be configured. The Cisco MWR 1941-DC router uses NTP to maintain a clocking source for the proper time stamping of system messages and log files.
The MWR 1941-DC 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, do the following starting 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 router, use the show controllers command.
Table 1 Memory Recommendations for the Cisco IOS Release 12.2(15)MC1b
Platform Software Image Flash
Cisco MWR 1941-DC Mobile Wireless Edge Router
64 MB Flash
128 MB DRAM
Note When running Cisco IOS Release 12.2(15)MC1a or later, we recommend that the smart-init feature be enabled.
The smart-init feature is an extension to the existing memory split program of the Cisco IOS software running on your router that computes iomem size by looking at the network modules installed in the system and uses this iomem for carrying out the memory split.
Setting the memory size using the memory-size iomen command disables the smart-init feature. If smart-init is disabled and the iomem is increased to 20% or more, the tftpboot operation using the mwr1900-is-mz image will fail. If this situation should occur, copy a new image to slot0 and boot from slot0.
Determining the Software Version
To determine the image and version of Cisco IOS software running on your Cisco MWR 1941-DC router, log in to the Cisco MWR 1941-DC and enter the show version EXEC command:router> show versionCisco Internetwork Operating System SoftwareIOS (tm) 1900 Software (MWR1900-IS-MZ), Version 12.2(15)MC1a,EARLY DEPLOYMENT RELEASESOFTWARE (fc1)
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:
Upgrading to a New ROM Monitor Version
The Cisco MWR 1941-DC router ROM Monitor (ROMMON) consists of two modules:
•A resident module that is not changed during the upgrade procedure.
•An upgradable module that is updated during the upgrade procedure. This is the only module that you will download from Cisco.com.
Note Before performing this procedure, you must download the new ROMMON image from Cisco.com. The download procedure is the same as downloading Cisco IOS software images.
Note In the event of a power outage, the ROM monitor download will not be successful.
Note Command output is similar to the following.
To upgrade the ROMMON version on your Cisco MWR 1941-DC router, complete these steps from EXEC mode:
Step 1 Copy the new ROMMON image from a TFTP server to slot0.
Step 2 Verify that the new image has been copied:Router#dir slot0:Directory of slot0:/3 -rw- 871 Mar 01 1993 00:05:02 MWR1900-3-default.cfg4 -rw- 610704 Mar 01 1993 00:10:30 MWR1900_RM2.srec.122-8r.MC3
Step 3 Upgrade the current configuration by entering the upgrade rom-monitor command as shown in the following example:Router# upgrade rom-monitor file slot0:MWR1900_RM2.srec.122-8r.MC3This command will reload the router. Continue? [yes/no]:y
Step 4 Press Enter to continue. The router begins downloading the ROMMON image. The router automatically reboots.ROMMON image upgrade in progressErasing boot flasheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeProgramming boot flash ppppNow ReloadingSystem Bootstrap, Version 12.2(20010915:181836) DEVELOPMENT SOFTWARECopyright (c) 1994-2001 by cisco Systems, Inc.Running new upgrade for first timeSystem Bootstrap, Version 12.2(8r)MC3, RELEASE SOFTWARE (fc1)TAC Support:http://www.cisco.com/tacCopyright (c) 2002 by cisco Systems, Inc.mwr1900 processor with 131072 Kbytes of main memoryMain memory is configured to 64 bit mode with parity disabledUpgrade ROMMON initializedrommon 1 >
New and Changed Information
The following sections list the new hardware and software features supported by the Cisco MWR 1941-DC router for Cisco IOS Release 12.2(15)MC1c.
New Features in the Cisco IOS Release 12.2(15)MC1c Software
The are no new hardware or software features.
New Features in the Cisco IOS Release 12.2(15)MC1b Software
The following new software features are supported by the Cisco MWR 1941-DC router for Cisco IOS Release 12.2(15)MC1b:
•2-Fast Ethernet 2-WAN Card Slot network module—NM-2FE2W-V2(=)
New Features in the Cisco IOS Release 12.2(15)MC1a Software
The following new software features are supported by the Cisco MWR 1941-DC router for Cisco IOS Release 12.2(15)MC1a:
Voice/WAN Interface Cards (VWICs)
•2-port T1/Fractional T1 Drop and Insert Multiflex Trunk Interface Card: VWIC-2MFT-T1-DIR(=)
•2-port E1/Fractional E1 Drop and Insert Multiflex Trunk Interface Card: VWIC-2MFT-E1-DIR(=)
•2-port Asynchronous/Synchronous WAN Interface Card: WIC-2A/S(=)
•2-Slot WAN: NM-2W(=)
Cisco Network Modules
•Alarm Interface Card—NM-AIC-64(=)
•16-port Ethernet Switch—NM-16ESW(=)
Note When using the NM-16ESW with the MWR 1941-DC router, shielded cables are required and IP phone inline power is not supported.
–16-port Asynchronous Serial—NM-16A(=)
–4-port Asynchronous/Synchronous Serial: NM-4A/S(=)
–8-port Asynchronous/Synchronous Serial: NM-8A/S(=)
•1-port T3/E3: NM-1T3/E3(=)
Limitations, Restrictions, and Important Notes
Caution The Cisco MWR 1941-DC router does not support online insertion and removal (OIR) of WAN interface cards. Any attempt to perform OIR on a card in a powered up router might cause damage to the card.
Caution The Cisco MWR 1941-DC 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.
Caution Removing the compact flash from the Cisco MWR 1941-DC router during a read/write operation might corrupt the contents of the compact flash, rendering it useless. To recover from an accidental removal of or corruption to the compact flash, a maintenance spare with the appropriate bootable Cisco IOS software image might be needed.
Using the 1-port T3/E3: NM-1T3/E3(=)
When using the 1-port T3/E3 network module in your MWR 1941-DC router configuration, note that E3 mode is not supported with Cisco IOS Release 12.2(15)MC1a. E3 mode is supported with Cisco IOS Release 12.2(15)MC1b and later.
Also, when used with the MWR 1941-DC router, the NM-1T3/E3 supports line rate throughput for traffic with packet sizes of 1500 bytes. For traffic with smaller packet sizes, degradation in throughput will be seen.
Upgrading the VWIC-2MFT-T1-DIR Microcode
When upgrading the image on your Cisco MWR 1941-DC router, power cycle the router or perform a microcode reload on the VWIC-2MFT-T1-DIR to ensure that the firmware for the VWIC-2MFT-T1-DIR is updated during the upgrade.
Caveats in Cisco IOS Release 12.2(15)MC1c
The following sections list and describe the open caveats for the Cisco MWR 1941-DC router running Cisco IOS Release 12.2(15)MC1c. 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 12.2 and 12.2 T are also in Cisco IOS Release 12.2(15)MC1c. 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. 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, Login to Cisco.com and click Software Center: Cisco IOS Software: Cisco Bugtool Navigator II. Another option is to go directly to http://www.cisco.com/support/bugtools.
There are no known caveats in Cisco IOS Release 12.2(15)MC1c.
The following caveats have been resolved in Cisco IOS Release 12.2(15)MC1c.
Description: NAT functionality does not work on skyhawk2 routed port. The show ip nat translation command does not show anything.
Workaround: There is no workaround.
Description: When the FastEthernet (FE0/1) interface cabling is disconnected on the active router in a redundant pair, the routers may attempt, but not complete swapping roles resulting in the VWIC interface WAN connection relays being left open. This results in a loss of WAN connectivity for both routers. Recovery requires a hard reset of the routers.
This condition occurs when two routers are connected and configured for active/standby Hot Standby Redundancy Protocol (HSRP) and have either the VWIC-2MFT-T1-DIR or the VWIC-2MFT-E1-DIR cards connected in a Y-cable WAN configuration.
Workaround: There is no workaround.
Description: The ATM-AIM module is not recognized by the mwr1900-is-mz software.
Workaround: There is no workaround.
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.
Collecting Data for Router Rebooting to ROMmon
If a router reboot to ROMmon occurs, issue the dir device ID command where device ID is slot0:, and look for the router processor file (crashinfo*). Once you have located the file, you can email the file along with a description of the problem to your Cisco representative.
There are no documentation updates at this time.
The following list includes documentation related to the Cisco MWR 1941-DC Mobile Wireless Edge Router. Most of these documents were not shipped with the router, but you can access them using the listed URL. You also can order printed copies by following the instructions in the "Ordering Documentation" section:
Cisco Radio Access Network Products
•Cisco Mobile Wireless IP RAN Documents
•Cisco MWR 1941-DC Mobile Wireless Edge Router Documents
–Cisco MWR 1941-DC Mobile Wireless Edge Router Hardware Installation Guide
–Cisco MWR 1941-DC Mobile Wireless Edge Router Software Configuration Guide
–Regulatory Compliance and Safety Information for the Cisco MWR 1941-DC Mobile Wireless Edge Router
–Cisco MWR 1941-DC 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
–VWIC-2MFT-T1-DIR, VWIC-2MFT-E1-DIR Installation Instructions
Note To be sure of obtaining the latest information, access the online documentation.
On CCO at:
On Cisco.com at:
Technical Support & Documentation>Routers>Cisco MWR 1900 Mobile Wireless Routers
Note To be sure of obtaining the latest information, access the online documentation.
Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several ways to obtain technical assistance and other technical resources. These sections explain how to obtain technical information from Cisco Systems.
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