Release Notes for Cisco MGX-RPM-1FE-CP Back Card for Cisco IOS Release 12.2(15)MC2g
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Table Of Contents
Release Notes for Cisco MGX-RPM-1FE-CP Back Card for Cisco IOS Release 12.2(15)MC2g
System Configuration Requirements
Determining the Software Version
Upgrading to a New Software Release
New Features in the Cisco IOS Release 12.2(15)MC2g Software
New Features in the Cisco IOS Release 12.2(15)MC2f Software
New Features in the Cisco IOS Release 12.2(15)MC2e Software
New Features in the Cisco IOS Release 12.2(15)MC2b Software
New Features in the Cisco IOS Release 12.2(15)MC2a Software
New Features in the Cisco IOS Release 12.2(15)MC1 Software
Dual MGX-RPM-1FE-CP Back Card Support
Ignoring the IP ID in RTP/UDP Header Compression
Configuring ACFC and PFC Handling During PPP Negotiation
Configuring the cUDP Flow Expiration Timeout Duration
Limitations, Restrictions, and Important Notes
Caveats in Cisco IOS Release 12.2(15)MC2g
Caveats in Cisco IOS Release 12.2(15)MC2f
Caveats in Cisco IOS Release 12.2(15)MC2e
Caveats in Cisco IOS Release 12.2(15)MC2b
Caveats in Cisco IOS Release 12.2(15)MC2a
Collecting Data for Back Card and Router Issues
Modifying the MLP Reorder Buffer
Cisco Product Security Overview
Reporting Security Problems in Cisco Products
Obtaining Technical Assistance
Cisco Technical Support Website
Definitions of Service Request Severity
Obtaining Additional Publications and Information
Release Notes for Cisco MGX-RPM-1FE-CP Back Card for Cisco IOS Release 12.2(15)MC2g
April 19, 2006
Cisco IOS Release 12.2(15)MC2g
OL-2920-12
These release notes are for the Cisco MGX-RPM-1FE-CP for Cisco IOS Release 12.2(15)MC2g. 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)MC2g see the "Caveats in Cisco IOS Release 12.2(15)MC2g" section. To review the release notes for Cisco IOS Release 12.2, go to Cisco.com and click Technical Documents. Select Release 12.2 from the Cisco IOS Software drop-down menu. Then click Cisco IOS Release Notes > Cisco IOS Release 12.2.
Contents
This document contains the following sections:
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System Configuration Requirements
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Introduction
The MGX-RPM-1FE-CP (one-port, Fast Ethernet-Co-processor) back card is a Cisco MGX 8850 RPM-PR back card that off-loads the following processes from the Route Processor Module (RPM-PR):
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The MGX-RPM-1FE-CP back card is designed to be used with an MGX 8850 that is equipped with one or more RPM-PRs and that terminates some number of T1 lines. Each MGX-RPM-1FE-CP back card has a termination capacity of up to 16 T1s (maximum four per MLP bundle). The maximum throughput limit of RPM-PR with 1FE-CP is 120,000 packets bi-directional. In a 16 MLP interface case, the T1s are expected to be lightly loaded. The MGX-RPM-1FE-CP is only supported with the MLP encapsulation.
The MGX-RPM-1FE-CP back card contains one Fast Ethernet (100Base-Tx) interface. The interface has an RJ45 connector that is used to connect the card to a Category 5 un-shielded twisted pair (UTP) cable. Both half- and full-duplex operation are supported.
MGX-RPM-1FE-CP Back Card in an IP-RAN of a Mobile Wireless Network
The MGX-RPM-1FE-CP back card off loads the compression/decompression of RTP/UDP headers and the multiplexing/demultiplexing of PPP frames.
The supported use of the MGX-RPM-1FE-CP back card is within an IP-RAN of a mobile wireless network. In mobile wireless networks, radio coverage over a geographical space is provided by a network of radios and supporting electronics (Base Transceiver Station or BTS) distributed over a wide area. Each radio and supporting electronics represents a "cell." In traditional networks, the radio signals or radio data frames collected in each cell are forwarded over a T1 (or similar low-speed, leased) line to a centralized Base Station Controller (BSC) where they are processed.
The implementation of the MGX-RPM-1FE-CP backcard in the IP-RAN solution requires the following components:
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The solution uses OSPF as the routing protocol and requires MLP for transmission of the packets between the aggregation node (MGX8850) and the BTS. It requires you to configure the following:
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In addition, you must configure a connection between the PVC and the FRSM as well as a connection between the FRSM and the PVC.
For detailed information about the MGX-RPM-1FE-CP back card and its implementation in the IP-RAN solution, see the MGX-RPM-1FE-CP Back Card Installation and Configuration Note.
System Configuration Requirements
The MGX-RPM-1FE-CP requires the following system configuration:
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Determining the Software Version
To determine the version of Cisco IOS software copied on the RPM-PR, access the CLI of the RPM-PR and enter the show version command:
rpm> show versionCisco Internetwork Operating System SoftwareIOS (tm) RPM Software (RPM-JS-M), Version 12.2(15)MC2a, EARLY DEPLOYMENT RELEASESOFTWARE (fc1)Upgrading to a New Software Release
For information about copying Cisco IOS images to RPM-PR Flash memory, see the RPM-PR Installation and Configuration document.
For general information about upgrading to a new Cisco IOS 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 the new hardware and software features supported by the Cisco MGX-RPM-1FE-CP for Cisco IOS Release 12.2(15)MC software.
New Features in the Cisco IOS Release 12.2(15)MC2g Software
No features are introduced in Cisco IOS Release 12.2(15)MC2g.
New Features in the Cisco IOS Release 12.2(15)MC2f Software
No features are introduced in Cisco IOS Release 12.2(15)MC2f.
New Features in the Cisco IOS Release 12.2(15)MC2e Software
No features are introduced in Cisco IOS Release 12.2(15)MC2e.
New Features in the Cisco IOS Release 12.2(15)MC2b Software
No features are introduced in Cisco IOS Release 12.2(15)MC2b.
New Features in the Cisco IOS Release 12.2(15)MC2a Software
No features are introduced in Cisco IOS Release 12.2(15)MC2a.
New Features in the Cisco IOS Release 12.2(15)MC1 Software
The following features were introduced in Cisco IOS Release 12.2(15)MC1:
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For information on new features in previous Cisco IOS Release 12.2MC software releases, see the platform release notes:
http://www.cisco.com/univercd/cc/td/doc/product/wireless/ipran/1_0/relnotes/index.htm
Dual MGX-RPM-1FE-CP Back Card Support
With Cisco IOS Release 12.2(15)MC1 and later, support for a second MGX-RPM-1FE-CP back card is available. However, the second card functions as an FE interface only and does not perform any compression functions.
Usage Notes
Please note that when using two MGX-RPM-1FE-CP back cards in an RPM, the interaction between the two cards is as follows:
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Additionally, the output of the show diag command has been updated to reflect the support for a second MGX-RPM-1FE-CP.
rpm10#sho diagSlot 1:One Port Fast Ethernet With Co-processor Assist Port adapter, 1 portPort adapter is analyzedPort adapter insertion time 01:13:53 agoCo-processor enabledEEPROM contents at hardware discovery:Top Assy. Part Number :800-16088-04Part Number :73-6262-04Board Revision :02PCB Serial Number :PAD04001DHTCLEI Code :B@3@24Y@A@Manufacturing Engineer :00 00 00 00RMA History :00RMA Test History :00RMA Test History :02EEPROM format version 4EEPROM contents (hex):0x00:04 17 40 03 17 C0 46 03 20 00 3E D8 04 82 49 180x10:76 04 42 30 32 C1 0B 50 41 44 30 34 30 30 31 440x20:48 54 C6 8A 42 40 33 40 32 34 59 40 41 40 84 000x30:00 00 00 04 00 03 00 03 02 FF FF FC FF FC FF FC0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFSlot 2:ATM CELL BUS Port adapter, 1 portPort adapter is analyzedPort adapter insertion time 01:14:31 agoEEPROM contents at hardware discovery:Top Assy. Part Number :800-00000-00Part Number :73-0000-00Board Revision :0PCB Serial Number :0EEPROM format version 4EEPROM contents (hex):0x00:04 51 40 00 90 C0 46 03 20 00 00 00 00 82 49 000x10:00 00 42 30 00 C1 01 30 FF FF FF FF FF FF FF FF0x20:09 40 C6 8A 30 00 00 00 00 00 00 00 00 00 84 000x30:00 00 00 04 00 03 00 03 00 FF FF FF FF FF FF FF0x40:04 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50:0A 2A FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60:42 D2 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70:00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x80:09 03 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x90:42 82 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xA0:0C 83 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xB0:00 C0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xC0:40 41 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xD0:82 82 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xE0:8C EC FF FF FF FF FF FF FF FF FF FF FF FF FF FF0xF0:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x100:02 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x110:63 51 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x120:42 C2 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x130:00 20 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x140:38 50 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x150:0C C2 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x160:0C AC FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x170:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x180:62 C0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x190:82 6C FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1A0:D1 CA FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1B0:00 C0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1C0:92 C8 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1D0:21 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1E0:0C 8C FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x1F0:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFSlot 3:One Port Fast Ethernet With Co-processor Assist Port adapter, 1 portPort adapter is analyzedPort adapter insertion time 01:14:07 agoCo-processor disabledEEPROM contents at hardware discovery:Top Assy. Part Number :800-16090-04Part Number :73-6518-04Board Revision :02PCB Serial Number :SAG06021EJ3CLEI Code :BA3A25YCAAManufacturing Engineer :00 00 00 00RMA History :00RMA Test History :00RMA Test History :02EEPROM format version 4EEPROM contents (hex):0x00:04 17 40 03 17 C0 46 03 20 00 3E DA 04 82 49 190x10:76 04 42 30 32 C1 0B 53 41 47 30 36 30 32 31 450x20:4A 33 C6 8A 42 41 33 41 32 35 59 43 41 41 84 000x30:00 00 00 04 00 03 00 03 02 FF FF FF FF FF FF FF0x40:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x50:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x60:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF0x70:FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FFIgnoring the IP ID in RTP/UDP Header Compression
With Cisco IOS Release 12.2(8)MC2c, IP ID checking was suppressed in RTP/UDP header compression. With Cisco IOS Release 12.2(15)MC1 and later, a new option was added to the ip rtp header-compression interface configuration command that allows you to enable or suppress this checking. The default is to suppress.
To suppress IP ID checking, issue the following command while in interface configuration mode:
Router(config-if)# ip rtp header-compression ignore-id
Suppresses the IP ID checking in RTP/UDP header compression.
To restore IP ID checking, use the no form of this command.
This new feature is identified by CSCdz75957.
Configuring ACFC and PFC Handling During PPP Negotiation
With Cisco IOS Release 12.2(15)MC1 and later, ACFC and PFC negotiation can be configured.
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Configuring ACFC Handling During PPP Negotiation
Use the following commands beginning in global configuration mode to configure ACFC handling during PPP negotiation:
Configuring PFC Handling During PPP Negotiation
Use the following commands beginning in global configuration mode to configure PFC handling during PPP negotiation:
To restore the default, use the no forms of these commands.
Note
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122b/122b_15/12b_acf.htm#1025043
Configuring the cUDP Flow Expiration Timeout Duration
To minimize traffic flow corruption, cUDP flows now expire after an expiration timeout duration during which no packets are passed. When this duration of inactivity occurs on a flow at the compressor, the compressor sends a full header upon receiving a packet for that flow, or, if no new packet is received for that flow, makes the CID for the flow available for new use. When a packet is received at the decompressor after the duration of inactivity, the packet is dropped and a context state message is sent to the compressor requesting a flow refresh.
The default expiration timeout is 5 seconds. The recommended value is 8 seconds.
Caution
To configure the cUDP flow expiration timeout duration, issue the following command while in multilink interface configuration mode:
Router(config-if)# ppp iphc max-time seconds
Specifies the duration of inactivity, in seconds, that when exceeded causes the cUDP flow to expire. The recommended value is 8.
To restore the default, use the no form of this command.
This new feature is identified by CSCeb44623.
Limitations, Restrictions, and Important Notes
When working with a MGX-RPM-1FE-CP back card, please take note of the following limitations, restrictions, and important notes:
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Caveats in Cisco IOS Release 12.2(15)MC2g
The following sections list and describe the open and resolved caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(15)MC2g. 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)MC2a. 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.
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Open Caveats
There are no known open caveats in Cisco IOS Release 12.2(15)MC2g.
Resolved Caveats
There are no known resolved caveats in Cisco IOS Release 12.2(15)MC2g.
Caveats in Cisco IOS Release 12.2(15)MC2f
The following sections list and describe the open and resolved caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(15)MC2f. 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)MC2a. 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.
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Open Caveats
There are no known open caveats in Cisco IOS Release 12.2(15)MC2f.
Resolved Caveats
There are no known resolved caveats in Cisco IOS Release 12.2(15)MC2f.
Caveats in Cisco IOS Release 12.2(15)MC2e
The following sections list and describe the open and resolved caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(15)MC2e. 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)MC2a. 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.
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Open Caveats
There are no known open caveats in Cisco IOS Release 12.2(15)MC2e.
Resolved Caveats
This section lists the caveats that are resolved in Release 12.2(15)MC2e.
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Description: The PPP over Ethernet (PPPoE) or PPP over ATM (PPPoA) sessions that go down may cause a leak of full virtual-access interfaces. This symptom is not observed with configurations that use virtual-access subinterfaces.
This symptom is observed with PPPoE or PPPoA sessions that clear because of the PPP protocol goes down (because of a termination request [TERMREQ] from a peer router or a PPP keepalive failure). The leaked virtual-access interfaces are not reused for new sessions. This results in the creation of new virtual-access interfaces for new sessions.
Workaround: There is currently no workaround.
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Description: A crash may occur when bringing up a large number of PPP over ATM (PPPoA) sessions.
This symptom is observed on a Cisco router that is running Cisco IOS Releases 12.2(15)B and 12.3.
Workaround: There is currently no workaround.
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Cisco IOS may permit arbitrary code execution after exploitation of a heap-based buffer overflow vulnerability. Cisco has included additional integrity checks in its software, as further described below, that are intended to reduce the likelihood of arbitrary code execution.
Cisco has made free software 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 12.2(15)MC2b
The following sections list and describe the open and resolved caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(15)MC2b. 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)MC2a. 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
Open Caveats
There are no known open caveats in Cisco IOS Release 12.2(15)MC2b.
Resolved Caveats
This section lists the caveats that are resolved in Release 12.2(15)MC2b.
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Description: Cisco routers running Cisco IOS supporting Multi Protocol Label Switching (MPLS) are vulnerable to a Denial of Service (DoS) attacks on the MPLS disabled interfaces.
This vulnerability is only present in Cisco IOS release trains based on 12.1T, 12.2, 12.2T, 12.3 and 12.3T. Releases based on 12.1 mainline, 12.1E and all releases prior to 12.1 are not vulnerable.
This bug is a complementary fix to CSCeb56909 which addresses this vulnerability.
More details can be found in the security advisory which is posted at:
http://www.cisco.com/warp/public/707/cisco-sa-20050126-les.shtml
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Description: A Fast Ethernet 100BASE-TX port adapter on an RPM-PR may stop receiving burst traffic packets.
This symptom is observed on a FE RPM-PR Backcard. To identify this problem, the output of the show interface fastethernet command shows no input packets and all packets as overrun:
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 100000 bits/sec, 106 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 263523 overrun, 0 ignored
The output of the show controllers command for the Fast Ethernet interface shows high numbers for "rx_fifo_overflow" and "throttled":
throttled=5352, enabled=5352, disabled=0
rx_fifo_overflow=434500, rx_no_enp=0, rx_state=0
Workaround: To clear the symptom, enter the shutdown interface configuration command followed by the no shutdown interface configuration command on the Fast Ethernet interface.
Further Problem Description: In the output of the show controllers command for the Fast Ethernet interface, locate the value for CFRV. If the last byte is either 0x20, 0x21, 0x22, or 0x23, the Fast Ethernet is susceptible to the symptom.
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Description: NetFlow Feature Acceleration CLI.
NetFlow Feature Acceleration has been deprecated and removed from Cisco IOS. The global command ip flow-cache feature-accelerate will no longer be recognized in any IOS configuration.
If your router configuration does not currently contain the command ip flow-cache feature-accelerate, this change does not affect you.
This removal does not require an upgrade of your existing installation.
The removal of NetFlow Feature Acceleration does not affect any other aspects of Netflow operation, for example Access-list processing. The features are separate and distinct.
Cisco Express Forwarding (CEF) supersedes the deprecated NetFlow Feature Acceleration.
Additionally, the following MIB objects and OIDs have been deprecated and removed from the netflow mib (CISCO-NETFLOW-MIB):
cnfFeatureAcceleration 1.3.6.1.4.1.9.9.99999.1.3
cnfFeatureAccelerationEnable 1.3.6.1.4.1.9.9.99999.1.3.1
cnfFeatureAvailableSlot 1.3.6.1.4.1.9.9.99999.1.3.2
cnfFeatureActiveSlot 1.3.6.1.4.1.9.9.99999.1.3.3
cnfFeatureTable 1.3.6.1.4.1.9.9.99999.1.3.4
cnfFeatureEntry 1.3.6.1.4.1.9.9.99999.1.3.4.1
cnfFeatureType 1.3.6.1.4.1.9.9.99999.1.3.4.1.1
cnfFeatureSlot 1.3.6.1.4.1.9.9.99999.1.3.4.1.2
cnfFeatureActive 1.3.6.1.4.1.9.9.99999.1.3.4.1.3
cnfFeatureAttaches 1.3.6.1.4.1.9.9.99999.1.3.4.1.4
cnfFeatureDetaches 1.3.6.1.4.1.9.9.99999.1.3.4.1.5
cnfFeatureConfigChanges 1.3.6.1.4.1.9.9.99999.1.3.4.1.6
Caveats in Cisco IOS Release 12.2(15)MC2a
The following sections list and describe the open and resolved caveats for the Cisco MGX-RPM-1FE-CP with Cisco IOS Release 12.2(15)MC2a. 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)MC2a. 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.
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Open Caveats
The following caveat is open in Cisco IOS Release 12.2(15)MC2a.
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Description: Administratively shutting down an FE interface while traffic is flowing on a second MGX-RPM-1FE-CP interface might cause a few seconds of packet lost on the second FE interface.
Workaround: Do not administratively shut down an FE interface on an active system when traffic is flowing.
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Description: The checkheaps process detects corrupted memory and when packets back up into the bundle output hold queue, causes a router reload.
Workaround: A software workaround (CSCeb74020) is implemented in Cisco IOS 12.2(15)MC1.
Resolved Caveats
This section lists the caveats resolved in Cisco IOS Release 12.2(15)MC2a.
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Description: Memory allocation failure (MALLOCFAIL) messages no longer occur for Cisco Discovery Protocol (CDP) processes.
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A Cisco device running Internetwork Operating System (IOS) and enabled for the Open Shortest Path First (OSPF) Protocol is vulnerable to a Denial of Service (DoS) attack from a malformed OSPF packet. The OSPF protocol is not enabled by default.
The vulnerability is only present in IOS release trains based on 12.0S, 12.2, and 12.3. Releases based on 12.0, 12.1 mainlines and all IOS images prior to 12.0 are not affected. Refer to the Security Advisory for a complete list of affected release trains.
Further details and the workarounds to mitigate the effects are explained in the Security Advisory which is available at the following URL:
http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml.
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Description: When the MGX-RPM-1FE-CP FastEthernet interface is administratively shut down, for directly connected devices, the interface still appears to be up.
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Description: A Cisco device reloads on receipt of a corrupt CDP packet.
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Description: Problems with the CDP protocol have been resolved.
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Description: A Cisco device experiences a memory leak in the CDP process. The device sending CDP packets sends a hostname that is 256 or more characters. There are no problems with a hostname of 255 or fewer characters.
Troubleshooting
This section contains the following MGX-RPM-1FE-CP troubleshooting information:
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Collecting Data for Back Card and Router Issues
To collect data for reporting back card and router issues, issue the following commands:
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Modifying the MLP Reorder Buffer
When PPP multiplexing is disabled on the inbound direction of a MWR 1941-DC multilink, there are many more packets to reorder. Therefore, we recommend that you modify the MLP reorder buffer using the ppp multilink slippage interface configuration commands to avoid discarded fragments due to buffer overflow.
Slippage is the amount by which data arriving on one link in a multilink bundle might lag behind data transmitted over another link in that bundle. The amount of slippage might be expressed as a direct byte count, but it is also commonly expressed as a measure of time, in terms of the differential delay between the links.
A small amount of slippage between links is normal. Whenever slippage occurs, the multilink input process must buffer fragment data arriving on the faster channels until it receives all expected fragments on the remaining links, so that it can sort the fragments back into proper order, reassemble datagrams as necessary, and then deliver the datagrams in proper order to the higher network layers (multilink fragments include sequence numbers so that the multilink receiver can readily detect when packets are arriving out of order). The receiver must be capable of buffering enough data to compensate for normal slippage between the links, otherwise it will be incapable of completely sequencing and reassembling datagrams, and some data will be lost.
With Cisco IOS Release 12.2(15)MC1 and later, the MLP reorder buffer can be adjusted for cases where the slippage is larger than the defaults readily accommodate. The buffer size is set by defining a one or more constraints, each of which indirectly implies some byte limit. The limit used is the maximum of the value derived from the constraints.
To define the constraints that set the MLP reorder buffer size, issue the following commands while in interface configuration mode:
Usage Notes
Note that these limits are on a "per-link" basis. For example, issuing ppp multilink slippage mru 4 means that the total amount of data which is buffered by the bundle is 4 times the MRU times the number of links in the bundle.
The reassembly engine is also affected by the lost fragment timeout, which is configured using the ppp timeout multilink lost-fragment command.
The buffer limit derived from the slippage constraints implies a corresponding tolerated differential delay between the links. Since it does not make sense to be declaring a fragment lost due to a timeout when it is within the delay window defined by the slippage, the timeout will be dynamically increased as necessary so that it is never smaller than the delay value derived from the slippage parameters.
Documentation Updates
This section contains information that was not included or was documented incorrectly in the MGX-RPM-1FE-CP Back Card Installation and Configuration Note. The heading in this section corresponds with the applicable section title in the documentation.
Configuring RTP/UDP Compression
The maximum number of RTP header compression connections is documented as 150 per T1 interface and up to 600 connections per MLP bundle when in fact, 1000 connections are supported per MLP bundle regardless of whether the bundle contains one T1 interface or four.
The show ppp mux Command
The efficiency improvement factor calculation documented in the show ppp mux command section is incorrect. The correct improvement factor calculation uses bytes, not packets, and is as follows:
Multiplex efficiency improvement factor = 100 * (Total bytes saved) / (Total bytes received)
Where total bytes saved = bytes_received_at_muxer - bytes_sent_at_muxer.
Demultiplex efficiency improvement factor = 100 * (Total bytes saved) / (Total bytes sent)
Where total bytes saved = bytes_sent_at_demuxer - bytes_received_at_demuxer.
The show ip rtp header-compression Command
The detail keyword is not supported in the show ip rtp header-compression command on the MGX-RPM-1FE-CP back card. Output does not display for the detail keyword if specified in command.
Related Documentation
The following sections describe the available documentation related to the Cisco MGX-RPM-1FE-CP back card.These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, and other documents.
Documentation is available in printed or electronic form.
Platform-Specific Documents
These documents are available for the Cisco MWR 1941-DC Mobile Wireless Edge Router on Cisco.com and the Documentation CD-ROM:
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Feature Modules
Feature modules describe new features supported by Cisco IOS Release 12.2 MC and are updates to the Cisco IOS documentation set. A feature module consists of an overview of the feature, configuration tasks, and a command reference.
On Cisco.com at:
Technical Documentation: Cisco IOS Software: Cisco IOS Release 12.2: New Feature Documentation:12.2-Based New Features: New Features in Release 12.2 MC
Obtaining 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.
Cisco.com
You can access the most current Cisco documentation at this URL:
http://www.cisco.com/univercd/home/home.htm
You can access the Cisco website at this URL:
You can access international Cisco websites at this URL:
http://www.cisco.com/public/countries_languages.shtml
Documentation DVD
Cisco documentation and additional literature are available in a Documentation DVD package, which may have shipped with your product. The Documentation DVD is updated regularly and may be more current than printed documentation. The Documentation DVD package is available as a single unit.
Registered Cisco.com users (Cisco direct customers) can order a Cisco Documentation DVD (product number DOC-DOCDVD=) from the Ordering tool or Cisco Marketplace.
Cisco Ordering tool:
http://www.cisco.com/en/US/partner/ordering/
Cisco Marketplace:
http://www.cisco.com/go/marketplace/
Ordering Documentation
You can find instructions for ordering documentation at this URL:
http://www.cisco.com/univercd/cc/td/doc/es_inpck/pdi.htm
You can order Cisco documentation in these ways:
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http://www.cisco.com/en/US/partner/ordering/
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Documentation Feedback
You can send comments about technical documentation to bug-doc@cisco.com.
You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:
Cisco Systems
Attn: Customer Document Ordering
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Cisco Product Security Overview
Cisco provides a free online Security Vulnerability Policy portal at this URL:
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
From this site, you can perform these tasks:
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A current list of security advisories and notices for Cisco products is available at this URL:
If you prefer to see advisories and notices as they are updated in real time, you can access a Product Security Incident Response Team Really Simple Syndication (PSIRT RSS) feed from this URL:
http://www.cisco.com/en/US/products/products_psirt_rss_feed.html
Reporting Security Problems in Cisco Products
Cisco is committed to delivering secure products. We test our products internally before we release them, and we strive to correct all vulnerabilities quickly. If you think that you might have identified a vulnerability in a Cisco product, contact PSIRT:
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Tip
Never use a revoked or an expired encryption key. The correct public key to use in your correspondence with PSIRT is the one that has the most recent creation date in this public key server list:
http://pgp.mit.edu:11371/pks/lookup?search=psirt%40cisco.com&op=index&exact=on
In an emergency, you can also reach PSIRT by telephone:
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Obtaining Technical Assistance
For all customers, partners, resellers, and distributors who hold valid Cisco service contracts, Cisco Technical Support provides 24-hour-a-day, award-winning technical assistance. The Cisco Technical Support Website on Cisco.com features extensive online support resources. In addition, Cisco Technical Assistance Center (TAC) engineers provide telephone support. If you do not hold a valid Cisco service contract, contact your reseller.
Cisco Technical Support Website
The Cisco Technical Support Website provides online documents and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The website is available 24 hours a day, 365 days a year, at this URL:
http://www.cisco.com/techsupport
Access to all tools on the Cisco Technical Support Website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register at this URL:
http://tools.cisco.com/RPF/register/register.do
Note
Submitting a Service Request
Using the online TAC Service Request Tool is the fastest way to open S3 and S4 service requests. (S3 and S4 service requests are those in which your network is minimally impaired or for which you require product information.) After you describe your situation, the TAC Service Request Tool provides recommended solutions. If your issue is not resolved using the recommended resources, your service request is assigned to a Cisco TAC engineer. The TAC Service Request Tool is located at this URL:
http://www.cisco.com/techsupport/servicerequest
For S1 or S2 service requests or if you do not have Internet access, contact the Cisco TAC by telephone. (S1 or S2 service requests are those in which your production network is down or severely degraded.) Cisco TAC engineers are assigned immediately to S1 and S2 service requests to help keep your business operations running smoothly.
To open a service request by telephone, use one of the following numbers:
Asia-Pacific: +61 2 8446 7411 (Australia: 1 800 805 227)
EMEA: +32 2 704 55 55
USA: 1 800 553-2447For a complete list of Cisco TAC contacts, go to this URL:
http://www.cisco.com/techsupport/contacts
Definitions of Service Request Severity
To ensure that all service requests are reported in a standard format, Cisco has established severity definitions.
Severity 1 (S1)—Your network is "down," or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.
Severity 2 (S2)—Operation of an existing network is severely degraded, or significant aspects of your business operation are negatively affected by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.
Severity 3 (S3)—Operational performance of your network is impaired, but most business operations remain functional. You and Cisco will commit resources during normal business hours to restore service to satisfactory levels.
Severity 4 (S4)—You require information or assistance with Cisco product capabilities, installation, or configuration. There is little or no effect on your business operations.
Obtaining Additional Publications and Information
Information about Cisco products, technologies, and network solutions is available from various online and printed sources.
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http://www.cisco.com/go/marketplace/
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http://www.cisco.com/go/iqmagazine
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http://www.cisco.com/en/US/learning/index.htm
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