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Table Of Contents
Hardware and Software Requirements
Determining the Software Version
Upgrading to a New Software Release
Limitations, Restrictions, and Important Notes
New Implementations and Behavior Changes in Cisco LTE SGW Release 1.1
Configuring Local Service Record Information Generation
Configuring Specification Conformance
Caveats - Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1
Caveats - Cisco LTE PGW Release 1.0, Cisco IOS Release 12.4(24)T3a
Implementing a Cisco LTE PGW Release 1.0 on the Cisco SAMI
Obtaining Documentation and Submitting a Service Request
Release Notes for Cisco LTE PDN Gateway Release 1.x on the Cisco SAMI,
Cisco IOS Software Release 12.4 T3a Releases
September 30, 2010
Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1
This release note describes the requirements, dependencies, and caveats for the Cisco Long Term Evolution (LTE) Packet Data Network (PDN) Gateway (PGW) Release 1.x, Cisco IOS Release 12.4(24)T3a1 on the Cisco Service and Application Module for IP (SAMI). These release notes are updated as needed.
For a list of the software caveats that apply to Cisco IOS Release 12.4(24)T3a, see the "Caveats" section and Caveats for Cisco IOS Release 12.4 T. The caveats document is updated for every maintenance release and is located on Cisco.com and the Documentation CD-ROM.
Use these release notes with Cross-Platform Release Notes for Cisco IOS Release 12.4 located on Cisco.com.
Contents
This release note includes the following information:
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MIBs
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Cisco LTE PGW Overview
The following sections provide a brief overview of the Cisco LTE PGW:
LTE Evolved Packet Core
The Cisco LTE PGW is a service designed for LTE Evolved Packet Core (EPC). The EPC is the main component of the System Architecture Evolution (SAE) that was designed by 3GPP to provide a migration path for 3GPP systems. The SAE is the core network architecture of LTE communication.
The SAE is an evolution of the General Packet Radio Service (GPRS) and Universal Mobile Telecommunication System (UMTS) that provides a migration path for 3GPP systems with the following differences:
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The LTE EPC is made up of the following primary elements:
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Figure 1 shows the interworking (and interfaces) of the LTE EPC with different radio access technologies.
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Figure 1 LTE Network Components with SGWs and PGWs Implemented on the Cisco Service and Application Module for IP in the Cisco 7600 Series Router
The following is a list of acronyms used in Figure 1.
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Cisco LTE PGW Description
For each UE associated with the EPC, there is at least one PGW providing access to the requested PDN. If a UE is accessing multiple PDNs, there might be more than one PGW for that UE.
For each UE associated with the EPS, there is at least one PDN gateway (PGW) providing access to the requested PDN. If a UE is accessing multiple PDNs, there may be more than one PGW for that UE.
The Cisco LTE PGW Release 1.0 and later provides the following support:
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The Cisco LTE PGW runs on the Cisco Service and Application Module for IP (SAMI), a new-generation high performance service module for the Cisco 7600 series router platforms.
For more information about the Cisco SAMI, see the Cisco Service and Application Module for IP User Guide.
System Requirements
This section describes the system requirements for Cisco LTE PGW Release 1.x and includes the following sections:
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For hardware requirements, such as power supply and environmental requirements and hardware installation instructions, see the Cisco Service and Application Module for IP User Guide.
Memory Recommendations
Hardware and Software Requirements
Implementing a Cisco LTE PGW Release 1.x and later on the Cisco 7600 series Internet router platform requires the following hardware and software.
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Or one of the following Cisco 7600 series route switch processors running Cisco IOS Release 15.0(1)S or later:
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For details on upgrading the Cisco IOS release running on the supervisor engine, refer to the "Upgrading to a New Software Release" section in the Release Notes for Cisco IOS Release 15.0S. For information about verifying and upgrading the LCP ROMMON image on the Cisco SAMI, refer to the Cisco Service and Application Module for IP User Guide.
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Determining the Software Version
To determine the version of Cisco IOS software running on your Cisco SAMI, log in to PPC3 and enter the show version EXEC command:
PGW# show versionCisco IOS Software, SAMI Software (SAMI-L3IK9S-M), Experimental Version 12.4(20100928:164957)Copyright (c) 1986-2010 by Cisco Systems, Inc.Compiled Tue 28-Sep-10 09:49 byROM: System Bootstrap, Version 12.4(20100716:044940) [sopm-smbu_lte_r1_5-CSCtf55588 105], DEVELOPMENT SOFTWAREPGW-Flash uptime is 22 hours, 14 minutesSystem returned to ROM by reload at 22:43:43 UTC Tue Sep 28 2010System restarted at 22:49:02 UTC Tue Sep 28 2010System image file is "c7svcsami-l3ik9s-mz"Last reload reason: Reload command by admin...PGW#Upgrading to a New Software Release
For information on upgrading to a new software release, see the product bulletin Cisco IOS Software Upgrade Ordering Instructions at:
http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm
Upgrading the Cisco SAMI Software
For information on upgrading the Cisco SAMI software, see the Cisco Service and Application Module for IP User Guide:
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MIBs
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
Limitations, Restrictions, and Important Notes
When configuring the Cisco LTE PGW, note the following:
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Therefore, to avoid the possibility of incomplete adjacency on VLAN interfaces for the redirected destination IP address and an impact to the upstream traffic flow for bearers/PDP sessions upon bootup, ensure that you configure the no ip cef optimize neighbor resolution command.
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Table 2 lists the maximum number the Cisco SAMI with the 2 GB memory option can support:
Table 2 Number of Bearers/PDPs Supported in 2 GB SAMI
GTPv2 bearer (IPv4 and IPv6)
380,000
GTPv1 PDP (IPv4 and IPv6)
800,000
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!interface Virtual-Template1description GGSN-VTip unnumbered Loopback0encapsulation gtpno logging event link-statusgprs access-point-list gprsend•
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New Implementations and Behavior Changes in Cisco LTE SGW Release 1.1
The following new feature and compliance change have been introduced in Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1:
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Configuring Local Service Record Information Generation
By default, the Cisco LTE PGW obtains service record information from the Cisco CSG2. With Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1, service record information can be generated locally, without the Cisco CSG2.
Service Record Generation with a Cisco CSG2
When generating service record information with a Cisco CSG2, the following configuration must exist:
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With the above implementation, the service record information is sent by the Cisco CSG to the Cisco LTE PGW, which adds it to the CDR.
Service Record Generation without a Cisco CSG2
When generating service record information without a Cisco CSG2, the following configuration must exist:
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With the above implementation, service information is generated by the PGW and added by the PGW to the CDR.
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To enable the PGW to generate service record information locally, complete the following tasks while in charging profile configuration mode.
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Configuring Specification Conformance
Support for the following 3GPP specification change requests (CRs) records for 29.274 has been introduced in Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1:
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Additionally, commands to configure backward compliance have been added for the following 29.274 CRs:
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To configure compliance for the above CR, complete the following tasks:
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Creating a Compliance Profile
Operators can create a compliance profile in which they configure CR compliance. Once a compliance profile has been created, it can be applied to a path group to a remote node. For information on creating a path group to a remote node, see"Creating a Remote Path Group" section.
To create a compliance profile and its CR configuration, complete the following tasks, beginning in global configuration mode:
Creating a Remote Path Group
Once a compliance profile has been configured, operators can create a path group. In the path group, the the address of the remote node is configured and as well as the compliance profile to use.
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only select severity 3 caveats are included in the caveats document.
All caveats in Cisco IOS Release 12.4 and Cisco IOS Release 12.4 T are also in Cisco IOS Release 12.4(22)YE.
For information on caveats in Cisco IOS Release 12.4, see Caveats for Cisco IOS Release 12.4.
For information on caveats in Cisco IOS Release 12.4 T, see Caveats for Cisco IOS Release 12.4T, which lists severity 1 and 2 caveats and select severity 3 caveats and is located on Cisco.com and the Documentation CD-ROM.
Using the Bug Navigator II
If you have an account with Cisco.com, you can use Bug Navigator II to find caveats the most current list of caveats of any severity for any software release. To reach Bug Navigator II, log in 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.
Caveats - Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1
This section contains open and resolved caveats that pertain to Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1.
Open Caveats
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The following sections document possible unexpected behavior and describe only severity 1 and 2 caveats and select severity 3 caveats.
Cisco LTE PGW
The following PGW caveats are open in Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1.
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The following error message displays on the console and some IPv6 addresses are not released into the pool after a session deletion, however, the addresses are assigned in subsequent session creations.
IPC-3-SAMI_IPV6_POOL_FAIL: Unexpected condition: Malloc Failure for IPv6 Pool Mgmt ModuleThis condition occurs when the Cisco LTE PGW is configured with 500 APNs, all of which have different VRFs and accounting and charging enabled, and the PGW receives continuous session create, modify, and delete requests at 750 cps.
Workaround: There is currently no known workaround, however, the addresses that were not deleted in the pool are not leaked since they are assigned to new users on subsequent session creations.
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Some sessions are not synchronized to the standby PGW, when Gx is enabled for dual stack sessions with the DHCP option.
When the PGW is configured with 500 APNs, all of which have VRF, Policy and Charging Control (PCC), accounting, charging, and DHCP proxy address allocation for IPv4 addresses, and redundancy configured, this condition occurs after approximately 38,000 sessions are created.
Workaround: There is currently no known workaround.
Cisco SAMI
This section lists the SAMI caveats that are open with Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1.
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For dual stack sessions belonging to APNs with MEF switching enabled, "MEF uplink packets / links" field displays some non-zero values immediately after the session comes up.
This condition occurs when sessions belonging to an APN, which has dual stack configured (using the gtp bearer dual-addr access-point configuration command) and has MEF switching enabled (using the redirect all ip access-point command). The show gprs gtp pdp-context tid command output displays some non-zero values in the "MEF uplink packets / links" field.
Workaround: There is currently no known workaround.
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Data packets to or from the mobiles are dropped for APNs with VRF when IXP switching is enabled (the default).
This condition occurs when the PGW is configured with 500 APNs, all of which are configured with a different VRF and the redirect all ip command. Traffic for mobiles from some of the 500 APNs is dropped at the IXP. The show mef access-point command displays an all zeros MAC address, for example, Redirect MAC Address: 0000.0000.0000.
Workaround: Before any sessions are open for mobiles under an APN, issuing the ping command to the redirect addresses configured under the affected APNs triggers an Address Resolution Protocol (ARP) request that should resolve the issue. Alternately, if there are a huge number of APNs with redirect addresses configured, saving the configuration and reloading the PGW resolves the issue.
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When the PGW is switching traffic at a high data rate (approximately 1.2 Mpps) for more than 48 hours, the following error message along with a traceback is seen,
%PLATFORM-3-SAMI_INTRHOG: DMA interrupt is running for (xxx)usecs, more than (xxx)usecs.This condition occurs when the PGW is connected to a Cisco CSG2 and there are 380K enabled sessions distributed over 500 APNs, all of which are configured with a different VRF, and the Gx and PCC features enabled, and the PGW is switching upstream and downstream data to these sessions at a high rate (1.2 million packets per second [MPPs]) for more than 48 hours.
Workaround: There is currently no known workaround.
Resolved Caveats
The following sections list caveats that have been resolved with Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1. Only severity 1 and 2 caveats and select severity 3 caveats are listed.
Cisco LTE PGW
The following PGW caveats are resolved in Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1.
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A fatal error occurs on the active PGW after the virtual-template interface is modified and sessions are cleared using the clear gprs gtp pdp-context command.
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A traceback is seen on the Cisco LTE PGW. This condition occurs with downstream traffic greater than 1500 over IPv6 PDPs.
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The show sami sm imsi output fails to display existing PDP sessions. Additionally, after some time, the gprs gtp pdp tid command output also displays nothing.
This condition occurs with IPv6 create requests with different restart counters.
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Tracebacks are observed with GTP Version 0 (GTPv0) PDPs on IPv6 transport handoffs to GTPv1 on IPv4 transport, and again with handoffs to GTPv0 on IPv4 transport.
This condition occurs only when the handoff is between different IPv6/IPv4 transport.
Cisco SAMI
There are no SAMI caveats resolved with Cisco LTE PGW Release 1.1, Cisco IOS Release 12.4(24)T3a1.
Caveats - Cisco LTE PGW Release 1.0, Cisco IOS Release 12.4(24)T3a
This section contains the following types of caveats that pertain to Cisco LTE PGW Release 1.0, Cisco IOS Release 12.4(24)T3a.
Open Caveats—Cisco LTE PGW
This section documents possible unexpected behavior by Cisco LTE PGW Release 1.0, Cisco IOS Release 12.4(24)T3a and describes only severity 1 and 2 caveats and select severity 3 caveats.
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Some sessions are deleted on the new standby PGW during the bulk sychronization after a switchover occurs.
This condition occurs with IPv6 transport, and IPv6 neighbor discovery for the next hop fails for a period of time (approximately 3 minutes) after the reload.
Workaround: Configure a static neighbor-to-IPv6 address mapping for the nexthop address for all GTP paths (for example ipv6 1:1:1:1::1 GigabitEthernet0/0.100 0022.3344.5566).
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A fatal error occurs on the active PGW after the virtual-template interface is modified and sessions are cleared using the clear gprs gtp pdp-context command.
Workaround: There is currently no known workaround.
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A traceback is seen on the Cisco LTE PGW. This condition occurs with downstream traffic greater than 1500 over IPv6 PDPs.
Workaround: There is currently no known workaround.
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The show sami sm imsi output fails to display existing PDP sessions. Additionally, after some time, the gprs gtp pdp tid command output also displays nothing.
This condition occurs with IPv6 create requests with different restart counters.
Workaround: There is currently no known workaround.
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Tracebacks are observed with GTP Version 0 (GTPv0) PDPs on IPv6 transport handoffs to GTPv1 on IPv4 transport, and again with handoffs to GTPv0 on IPv4 transport.
This condition occurs only when the handoff is between different IPv6/IPv4 transport.
Workaround: There is currently no known workaround.
Open Caveats—Cisco SAMI
This section lists the SAMI caveats that are open with Cisco LTE PGW Release 1.0, Cisco IOS Release 12.4(24)T3a.
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The Cisco LTE gateway allows out of sequence traffic. This condition occurs when sending upstream traffic with the sequence number set to FFFF only with Mobile Express Forwarding (MEF). With Cisco Express Forwarding (CEF), the packets are dropped as designed.
Workaround: Use CEF instead of MEF.
Related Documentation
Except for feature modules, documentation is available as printed manuals or electronic documents. Feature modules are available online on Cisco.com.
Use these release notes with these documents:
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Release-Specific Documents
The following documents are specific to Cisco IOS Release 12.4 and are located at Cisco.com:
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Documentation > Cisco IOS Software > Cisco IOS Software Releases 12.4 Mainline > Release Notes
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Documentation > Cisco IOS Software > Cisco IOS Software Releases 12.4 T > Release Notes
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Documentation > Cisco IOS Software > Cisco IOS Software Releases 12.4 Mainline
Platform-Specific Documents
These documents are available for the Cisco 7600 series router platform on Cisco.com and the Documentation CD-ROM:
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Cisco 7600 series router documentation is available at:
http://www.cisco.com/en/US/products/hw/routers/ps368/products_installation_guides_books_list.html
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The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents that are shipped with your order in electronic form on the Documentation CD-ROM, unless you specifically ordered the printed versions.
Documentation Modules
Each module in the Cisco IOS documentation set consists of two books: a configuration guide and a corresponding command reference guide. Chapters in a configuration guide describe protocols, configuration tasks, Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference guide list command syntax information. Use each configuration guide with its corresponding command reference. On Cisco.com at:
Documentation > Cisco IOS Software > Cisco IOS Software Releases 12.4 Mainline > Command References
Documentation > Cisco IOS Software > Cisco IOS Software Releases 12.4 Mainline > Command References > Configuration Guides
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Implementing a Cisco LTE PGW Release 1.0 on the Cisco SAMI
The following sections list related documentation (by category and then by task) to use when you implement a Cisco LTE PGW on the Cisco SAMI platform.
General Overview Documents
Core Cisco 7609 Router Documents
http://cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html
Documentation List by Task
For the most up-to-date list of documentation on the Cisco 7600 series router, refer to the Cisco 7600 Series Routers Documentation Roadmap on Cisco.com at:
http://cisco.com/en/US/docs/routers/7600/roadmaps/7600map.html
Getting Started
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http://cisco.com/en/US/products/hw/routers/ps368/products_quick_start09186a0080092248.html
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http://www.cisco.com/en/US/partner/docs/routers/7600/Hardware/RCSI/78_13690.html
Unpacking and installing the Cisco 7600 router:
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http://www.cisco.com/en/US/partner/docs/routers/7600/Hardware/Chassis_Installation/7600_Series_Router_Installation_Guide/pref.html
Installing the Supervisor module and configuring the router (basic configuration, such as VLANs, IP):
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http://www.cisco.com/en/US/partner/products/hw/routers/ps368/prod_installation_guides_list.html
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Installing and completing the Cisco SAMI configuration:
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http://www.cisco.com/en/US/partner/products/hw/routers/ps368/prod_installation_guides_list.html
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http://www.cisco.com/en/US/docs/wireless/service_application_module/sami/user/guide/samiv1.html
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, 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.
This document is to be used in conjunction with the Cisco GGSN Release 9.0 Configuration Guide and the Cisco GGSN Release 9.0 Command Reference publications.
Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)
Copyright © 2010, Cisco Systems, Inc.
All rights reserved.
