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Table Of Contents
Determining the Software Version
Upgrading to a New Software Release
Support for Existing Cisco MWR 2941 Software Features
New Hardware Features in Cisco IOS Release 15.1(3)MRA3
New and Changed Behavior in Cisco IOS Release 15.1(3)MRA3
Supported Hardware—Cisco MWR 2941-DC Router
Caveats in Cisco IOS Release 15.1(3)MRA3
Obtaining Documentation and Submitting a Service Request
Release Notes for Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5.4, Cisco IOS Release 15.1(3)MRA3
January 10, 2014These release notes are for the Cisco MWR Mobile Wireless Edge Router Release 3.5.4 for Cisco IOS Release 15.1(3)MRA3. These release notes are updated as needed to describe new features, memory requirements, hardware support, software platform deferrals, and changes to the microcode.
For a list of the software caveats that apply to Cisco IOS Release 15.1(3)MRA3, see the "Caveats in Cisco IOS Release 15.1(3)MRA3".
To review all Cisco MWR 2941 release notes, including Release Notes for Cisco MWR 2941 Mobile Wireless Edge Router for Cisco IOS Release 15.1(3)MRA, go to:
http://www.cisco.com/en/US/products/ps9395/prod_release_notes_list.html
To review release notes for the Cisco IOS Software Release 15.1S, go to:
http://www.cisco.com/en/US/products/ps10890/prod_release_notes_list.html
Contents
This document contains the following sections:
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Caveats in Cisco IOS Release 15.1(3)MRA3
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Introduction
The Cisco MWR 2941 Mobile Wireless Router is a cell-site access platform specifically designed to aggregate and transport mixed-generation radio access network (RAN) traffic. The router is used at the cell site edge as a part of a 2G, 3G, or 4G radio access network (RAN). The Cisco MWR 2941 includes the following models:
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The Cisco MWR 2941 router helps enable a variety of RAN solutions by extending IP connectivity to devices using Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Node Bs using HSPA or LTE, base transceiver stations (BTSs) using Enhanced Data Rates for GSM Evolution (EDGE), Code Division Multiple Access (CDMA), CDMA-2000, EVDO, or WiMAX, and other cell-site equipment. It transparently and efficiently transports cell-site voice, data, and signaling traffic over IP using traditional T1 and E1 circuits, as well as alternative backhaul networks such as Carrier Ethernet and DSL, Ethernet in the First Mile (EFM), and WiMAX. It also supports standards-based Internet Engineering Task Force (IETF) Internet protocols over the RAN transport network, including those standardized at the Third-Generation Partnership Project (3GPP) for IP RAN transport. Custom designed for the cell site, the Cisco MWR 2941 features a small form factor, extended operating temperature, and cell-site DC input voltages.
System Requirements
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Memory Requirements
Table 1 lists the required memory for using this software.
Determining the Software Version
To determine the image and version of Cisco IOS software running on your Cisco MWR 2941 router, log in to the router and enter the show version EXEC command:
Router> show versionCisco IOS Software, 2900 Software (MWR2900-ADVIPRANK9-M), Version 15.1(3)MRA3, RELEASE SOFTWARE (fc5)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2014 by Cisco Systems, Inc.Compiled Fri 10-Jan-14 00:53 by prod_rel_teamROM: System Bootstrap, Version 12.3(20090306:152119) [BLD-v124_19_mr2_throttle 104], DEVELOPMENT SOFTWARERouter uptime is 4 minutesSystem returned to ROM by power-onSystem restarted at 04:28:06 IST Sat Jan 11 2014System image file is "flash:mwr2941-adviprank9-mz.151-3.MRA3"Upgrading to a New Software Release
For general information about upgrading to a new software release, refer to the Software Installation and Upgrade Procedures at:
http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a00801fc986.shtml
New and Changed Information
The following sections list the new hardware and software features supported by the Cisco MWR 2941 router.
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Support for Existing Cisco MWR 2941 Software Features
Cisco IOS Release 15.1(3)MRA3 supports the software features supported in Cisco IOS Release 15.1S.
For more information about Release 15.1S and previous releases, see:
http://www.cisco.com/en/US/products/ps9395/prod_release_notes_list.html.
New Hardware Features in Cisco IOS Release 15.1(3)MRA3
There are no new hardware features with Cisco MWR 2941 Release 3.5.4.
New and Changed Behavior in Cisco IOS Release 15.1(3)MRA3
There are no new and changed behavior with Cisco MWR Release 3.5.4, Cisco IOS Release 15.1(3)MRA3.
Limitations and Restrictions
Caution
Cisco IOS Release 15.1(3)MRA3 for the Cisco MWR 2941 router has the following limitations and restrictions:
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Note
For more information about configuring dMLPPP, see the Cisco MWR 2941-DC Mobile Wireless Edge Router Software Configuration Guide, Release 15.1(3)MRA3.
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Supported Hardware—Cisco MWR 2941-DC Router
The Cisco MWR 2941 supports the following interface cards:
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Note
The Cisco MWR 2941 router supports the following SFP modules:
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Other hardware interfaces are not supported.
Caution
For instructions on how to install HWICs and SFPs, see the documentation included with the product. For information about how to configure HWICs and SFPs, see the Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Cisco IOS Release 15.1(3)MR.
Supported MIBs
The Cisco MWR 2941 router supports the following MIBs:
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Caveats in Cisco IOS Release 15.1(3)MRA3
This section documents the open and resolved caveats for the Cisco MWR 2941 router running Cisco IOS Release 15.1(3)MRA3.
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. Only select severity 3 caveats are listed.
For information on caveats in Cisco IOS Software Releases 15.1S, go to:
http://www.cisco.com/en/US/products/ps10890/prod_release_notes_list.html.
The following section describe the following types of caveats in Cisco IOS Release 15.1(3)MRA3.
Open Caveats
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Symptom: The MWR2941 router will crash when an active member link within a Port-Channel changes port speed to a setting not shared with other member links.
Conditions: Occurs in the following topology:
Topology: MWR1-----------MWR2
Misconfiguration of different speed member links in a port channel causes the router to crash.
Workaround: Hardset the member links to the desired speed and duplex settings same as other members.
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Symptom: TTL does not decrement on MWR while using NextHop through default route.
Conditions: Occurs when the destined route is reached through default route.
Workaround: Using specific static route to reach Destination prefix.
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Symptom: Huge Decrement in TTL when MWR, with Explicit-null configured, acts as exit point.
Conditions: Occurs when the MWR acts as MPLS exit point with Explicit Null configured.
Workaround: Removing the "mpls ldp explicit-null" configuration.
Resolved Caveats
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Symptom: Traffic Leak with flex-link on MWR2941, where the two members of a flexi-link are connected to two different ME3400 belonging to a REP-ring.
Conditions: Traffic leaking over backup interface would cause L2-loop, if they did not have configured port-security on the ME3400.
Topology:
IXIA1---------MWR1-----------ME3400--------IXIA2
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ME3400
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IXIA3
Configure Flexi link in MWR towards peer nodes and flapping any of the flexi-link members.
Workaround: Currently there is no known workaround.
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Symptom: Memory leaks seen with LACP configured in Port-channel with policy-map
Conditions: Having Ingress and Egress policy-map in Port-channel and flapping the member links.
Topology: IXIA1---------MWR1-----2 links------MWR2--------IXIA2
Workaround: Currently there is no known workaround.
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Symptoms: Aggregate MPLS label is missing in LFIB after MWR reload.
Conditions: Occurs in the following topology:
Topology: IXIA1---------MWR1-----------MWR2-------IXIA2
Configure two PE routers back-to-back for L3 MPLS VPN feature: PE1 and PE2 with only single VRF.
Do a reload. After reload, aggregate MPLS label will be missing in LFIB.
Workaround: Configure a dummy VRF in MWR. Aggregate MPLS label will now be generated in LFIB.
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Symptoms: HWIC-4ESW / HWIC-9ESW locks up after 5-6 days of operation.
Conditions: Occurs in the following topology:
Topology: IXIA1---------MWR1(HWIC)----------- (HWIC)MWR2--------IXIA2
Connect two devices on HWIC-4ESW.
After 5-6 days of maximum operation, the user cannot ping from the VLAN interface to a directly connected device on the HWIC-4ESW.
Workaround: Reloading the router resolves the connectivity issue.
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Symptoms: IPv6 NA packet being dropped when MWR2941 is used as a switch.
Conditions: Occurs in the following topology:
Topology: MWR1(IPV6 L3 client)--------MWR2(IPV6 L2 client)--------MWR3(IPV6 L3 client)
Configure middle MWR as switch between two MWR's acting as IPv6 L3 clients.
IPv6 NA packets will get dropped on the middle MWR.
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Symptom: MWR BFD sessions stuck in Init status after LACP failover sequence.
Conditions: Occurs in the following topology:
Topology: MWR1-----------MWR2
Establish 3-member link LACP in working condition (that is, all BFD sessions across the LAG in "Up" state).
Shut 2 of the 3 member links then unshut one of the 2 downed member links, and quickly shut the 3rd member link.
Now all BFD sessions are stuck in "Init" mode indefinitely; ping over the LAG also fails.
Workaround: Unshut the downed member link and it will bring the BFD sessions back Up.
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Symptom: Large OSPF packets might stuck internal ethernet tsec interface.
Conditions: Occurs in the following topology:
Topology: IXIA1---------MWR1---------MWR2--------IXIA2
Configure MTU 4470 over VLAN interface and enable OSPF routing.
Then do a VRF ping with size 4470 between PE routers.
Now OSPF neighbor relation will stuck in "Init" state.
Workaround: Reload any one of the MWR router, OSPF relation will be back to FULL.
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Symptom: MWR2941 Router crashes due to CPU HOG by spanning tree process.
Conditions: Occurs in the following topology:
Topology: IXIA1---------MWR1---------MWR2--------IXIA2
Configure Port-channel between the MWR Routers.
Remove Member links from an active port-channel through configuration.
Member links in a port-channel flap due to indirect link failure detected by LACP.
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Symptom: End to End Traffic does not flow in MWR if it is used as Core LSR.
Conditions: Occurs in the following topology:
Topology: IXIA1---------MWR1-----------MWR2--------MWR3-------IXIA2
Configure MWR as P router between any PE routers.
End to End traffic between Xconnect will not flow.
Workaround: Configure explicit-null in Edge LSR, and then traffic will flow end to end.
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Symptom: Command "xconnect backup force-switchover peer" does not work.
Conditions: Occurs in the following topology:
Topology:
IXIA1---------MWR1-----------MWR2--------IXIA2
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Configure Primary PW between MWR1 and MWR2, Back-up PW between MWR1 and MWR3.
Make primary PW down, then backup PW comes up but the traffic will not forward through it.
Workaround: Flap the PW associated SVI in MWR1.
Troubleshooting
The following sections describe troubleshooting commands you can use with the Cisco MWR 2941.
Collecting Data for Router Issues
To collect data for reporting router issues, issue the following command:
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Collecting Data for ROMmon Issues
To collect data for ROMmon issues, issue the following command while in EXEC mode:
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Related Documentation
Related documents for implementing the Cisco MWR 2941 mobile wireless edge router are available on Cisco.com
To access the related documentation on Cisco.com, go to:
http://www.cisco.com/en/US/products/ps9395/tsd_products_support_series_home.html
Documents related to the Cisco MWR 2941-DC mobile wireless edge router include the following guides:
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Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service request, and gathering additional information, 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
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS Version 2.0.
