Cisco ASR 5000 Series Instruction Manual

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Cisco ASR 5000 Series HRPD Serving Gateway Administration Guide
© 2010 Cisco Systems, Inc. and/or its affiliated entities. All rights reserved.

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CONTENTS
About this Guide ............................................................................................... vii
Conventions Used..................................................................................................................................................viii
Contacting Customer Support .................................................................................................................................. x
HRPD Serving Gateway Overview................................................................... 11
eHRPD Network Summary .................................................................................................................................... 12
eHRPD Network Components........................................................................................................................... 13
Evolved Access Network (eAN)................................................................................................................... 13
Evolved Packet Control Function (ePCF)..................................................................................................... 13
HRPD Serving Gateway (HSGW) ................................................................................................................ 13
E-UTRAN EPC Network Components ............................................................................................................. 14
eNodeB ......................................................................................................................................................... 14
Mobility Management Entity (MME) ........................................................................................................... 14
Serving Gateway (S-GW) ............................................................................................................................. 15
PDN Gateway (P-GW) ................................................................................................................................. 15
Product Description................................................................................................................................................ 17
Basic Features.................................................................................................................................................... 18
Authentication............................................................................................................................................... 18
IP Address Allocation ................................................................................................................................... 19
Quality of Service ......................................................................................................................................... 19
AAA, Policy and Charging ........................................................................................................................... 20
Product Specifications ............................................................................................................................................ 21
Licenses ............................................................................................................................................................. 21
Hardware Requirements .................................................................................................................................... 21
Platforms....................................................................................................................................................... 21
Components .................................................................................................................................................. 21
Operating System Requirements ....................................................................................................................... 22
Network Deployment(s) ......................................................................................................................................... 23
HRPD Serving Gateway in an eHRPD Network ............................................................................................... 23
Supported Logical Network Interfaces (Reference Points)........................................................................... 24
Features and Functionality - Base Software ........................................................................................................... 28
Subscriber Session Management Features......................................................................................................... 28
Proxy Mobile IPv6 (S2a) .............................................................................................................................. 28
Mobile IP Registration Revocation............................................................................................................... 29
Session Recovery Support ............................................................................................................................ 29
Non-Optimized Inter-HSGW Session Handover .......................................................................................... 30
Quality of Service Management Features.......................................................................................................... 30
DSCP Marking.............................................................................................................................................. 31
UE Initiated Dedicated Bearer Resource Establishment............................................................................... 31
Network Access and Charging Management Features ...................................................................................... 32
EAP Authentication (STa) ............................................................................................................................ 32
Rf Diameter Accounting ............................................................................................................................... 32
AAA Server Groups...................................................................................................................................... 33
Dynamic Policy and Charging: Gxa Reference Interface ............................................................................. 33
Intelligent Traffic Control............................................................................................................................. 34
Network Operation Management Functions ...................................................................................................... 34
A10/A11 ....................................................................................................................................................... 34

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Multiple PDN Support.................................................................................................................................. 35
P-GW Selection (Discovery) ........................................................................................................................ 35
PPP VSNCP.................................................................................................................................................. 36
Congestion Control....................................................................................................................................... 36
IP Access Control Lists ................................................................................................................................ 37
System Management Features ........................................................................................................................... 37
Management System..................................................................................................................................... 37
Bulk Statistics Support ................................................................................................................................. 39
Threshold Crossing Alerts (TCA) Support ................................................................................................... 40
ANSI T1.276 Compliance ............................................................................................................................ 41
Features and Functionality - External Application Support ................................................................................... 42
Web Element Management System................................................................................................................... 42
Features and Functionality - Optional Enhanced Feature Software ....................................................................... 44
IP Header Compression (RoHCv1 for IPv6) ..................................................................................................... 44
IP Security (IPSec) ............................................................................................................................................ 44
Traffic Policing and Shaping............................................................................................................................. 45
Traffic Policing............................................................................................................................................. 45
Traffic Shaping ............................................................................................................................................. 46
Layer 2 Traffic Management (VLANs)............................................................................................................. 46
Call/Session Procedure Flows................................................................................................................................ 47
Initial Attach with IPv6/IPv4 Access ................................................................................................................ 47
PMIPv6 Lifetime Extension without Handover ................................................................................................ 49
PDN Connection Release Initiated by UE......................................................................................................... 50
PDN Connection Release Initiated by HSGW .................................................................................................. 52
PDN Connection Release Initiated by P-GW.................................................................................................... 53
Supported Standards............................................................................................................................................... 56
3GPP References............................................................................................................................................... 56
3GPP2 References............................................................................................................................................. 56
IETF References................................................................................................................................................ 57
Object Management Group (OMG) Standards.................................................................................................. 57
HSGW Configuration ........................................................................................ 59
Configuring the System to Perform as a Standalone HSGW ................................................................................. 60
Information Required ........................................................................................................................................ 60
Required Local Context Configuration Information..................................................................................... 60
Required HSGW Context Configuration Information .................................................................................. 61
Required MAG Context Configuration Information .................................................................................... 62
Required AAA Context Configuration Information ..................................................................................... 62
How This Configuration Works ........................................................................................................................ 64
Configuration .................................................................................................................................................... 66
Initial Configuration ..................................................................................................................................... 67
HSGW and MAG Service Configuration ..................................................................................................... 71
AAA and Policy Configuration .................................................................................................................... 72
Optional Header Compression Configuration .............................................................................................. 75
Verifying and Saving the Configuration....................................................................................................... 76
Verifying and Saving Your Configuration ...................................................... 77
Verifying the Configuration ................................................................................................................................... 78
Feature Configuration........................................................................................................................................ 78
Service Configuration........................................................................................................................................ 79
Context Configuration....................................................................................................................................... 80
System Configuration........................................................................................................................................ 80
Finding Configuration Errors ............................................................................................................................ 80
Saving the Configuration ....................................................................................................................................... 82
Saving the Configuration on the Chassis ............................................................................................................... 83
Monitoring the Service ..................................................................................... 85

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Monitoring System Status and Performance .......................................................................................................... 86
Clearing Statistics and Counters............................................................................................................................. 88
HSGW Engineering Rules ................................................................................ 89
Interface and Port Rules ......................................................................................................................................... 90
A10/A11 Interface Rules ................................................................................................................................... 90
S2a Interface Rules ............................................................................................................................................ 90
MAG to LMA Rules ..................................................................................................................................... 90
HSGW Service Rules ............................................................................................................................................. 92
HSGW Subscriber Rules ........................................................................................................................................ 93
Sample Configuration Files ............................................................................. 95
Standalone eHRPD Serving Gateway .................................................................................................................... 96
Configuration Sample........................................................................................................................................ 96

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About this Guide
This document pertains to features and functionality that run on and/or that are related to the Cisco® ASR 5000 Chassis,
formerly the Starent Networks ST40.

About this Guide
▀Conventions Used
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Conventions Used
The following tables describe the conventions used throughout this documentation.
Icon
Notice Type
Description
Information Note
Provides information about important features or instructions.
Caution
Alerts you of potential damage to a program, device, or system.
Warning
Alerts you of potential personal injury or fatality. May also alert you of potential
electrical hazards.
Electro-Static Discharge
(ESD)
Alerts you to take proper grounding precautions before handling a product.
Typeface Conventions
Description
Text represented as a
This typeface represents displays that appear on your terminal screen, for example:
Text represented as
This typeface represents commands that you enter, for example:
This document always gives the full form of a command in lowercase letters. Commands
are not case sensitive.
Text represented as a
This typeface represents a variable that is part of a command, for example:
slot_number is a variable representing the desired chassis slot number.
Text represented as menu or sub-
menu names
This typeface represents menus and sub-menus that you access within a software
application, for example:
Click the File menu, then click New
Command Syntax
Conventions
Description
{ or
}
Required keywords and variables are surrounded by grouped brackets.
Required keywords and variables are those components that are required to be entered as part of the
command syntax.

About this Guide
Conventions Used ▀
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Command Syntax
Conventions
Description
[ or
]
Optional keywords or variables, or those that a user may or may not choose to use, are surrounded by square
brackets.
|
With some commands there may be a group of variables from which the user chooses one. These are called
alternative variables and are documented by separating each variable with a vertical bar (also known as a
pipe filter).
Pipe filters can be used in conjunction with required or optional keywords or variables. For example:
OR
[ | ]

About this Guide
▀Contacting Customer Support
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Contacting Customer Support
Use the information in this section to contact customer support.
For New Customers: Refer to the support area of http://www.cisco.com for up-to-date product documentation or to
submit a service request. A valid username and password is required to this site. Please contact your local sales or
service representative for additional information.
For Existing Customers with support contracts through Starent Networks: Refer to the support area of
https://support.starentnetworks.com/ for up-to-date product documentation or to submit a service request. A valid
username and password is required to this site. Please contact your local sales or service representative for additional
information.
Important: For warranty and repair information, please be sure to include the Return Material Authorization
(RMA) tracking number on the outside of the package.

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Chapter 1
HRPD Serving Gateway Overview
The ASR 5000 provides wireless carriers with a flexible solution that functions as an HRPD Serving Gateway (HSGW)
in 3GPP2 evolved High Rate Packet Data (eHRPD) wireless data networks.
This overview provides general information about the HSGW including:
eHRPD Network Summary
Product Description
Product Specifications
Network Deployment(s)
Features and Functionality - Base Software
Features and Functionality - External Application Support
Features and Functionality - Optional Enhanced Feature Software
Call Session Procedure Flows
Supported Standards

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eHRPD Network Summary
In a High Rate Packet Data (HRPD) network, the method of mobility is performed using client-based mobile IPv6 or
Client Mobile IPv6 (CMIPv6). This involves the mobile node with an IPv6 stack maintaining a binding between its
home address and its care-of address. The mobile node must also send mobility management signaling messages to a
home agent.
The primary difference in an evolved HRPD (eHRPD) network is the use of network mobility (via proxy) allowing the
network to perform mobility management, instead of the mobile node. This form of mobility is known as Proxy Mobile
IPv6 (PMIPv6).
The eHRPD network’s main function is to provide interworking of the mobile node with the Evolved Packet System
(EPS). The EPS is a 3GPP Enhanced UMTS Terrestrial Radio Access Network/Evolved Packet Core (E-UTRAN/EPC).
The E-UTRAN/EPC is the core data network of the 4G System Architecture Evolution (SAE) network supporting the
Long Term Evolution Radio Access Network (LTE RAN).
The following figure shows the physical relationship of the eHRPD network with the E-UTRAN/EPC.
Internet
Enterprise
eAN/ePCF
S-GW
eHRPD
eNodeB
MME
P-GW
PCRF
3GPP AAA
HSS
E-UTRAN
EPC
HSGW
The primary functions of the eHRPD network are:
Connectivity to LTE core (EPC)

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Support for multiple PDN connections
Leverage existing CDMA infrastructure
Migration path to LTE
Minimal changes to RAN infrastructure
Support handoffs between LTE RAN(E-UTRAN) and eHRPD
eHRPD Network Components
The eHRPD network is comprised of the following components:
Evolved Access Network (eAN)
The eAN is a logical entity in the radio access network used for radio communications with an access terminal (mobile
device). The eAN is equivalent to a base station in 1x systems. The eAN supports operations for EPS –eHRPD RAN in
addition to legacy access network capabilities.
Evolved Packet Control Function (ePCF)
The EPCF is an entity in the radio access network that manages the relay of packets between the eAN and the HSGW.
The ePCF supports operations for the EPS –eHRPD RAN in addition to legacy packet control functions.
The ePCF supports the following:
Main service connection over SO59
Uses PDN-MUX and allows multiplexing data belonging to multiple PDNs
Signaling over Main A10
LCP messages for PPP link establishment
EAP messages used for authentication
VSNCP messages for establishment of PDNs
VSNP for establishment of EPS bearers and QoS mappings (RSVP)
HRPD Serving Gateway (HSGW)
The HSGW is the entity that terminates the HRPD access network interface from the eAN/PCF. The HSGW
functionality provides interworking of the AT with the 3GPP EPS architecture and protocols specified in 23.402
(mobility, policy control (PCC), and roaming). The HSGW supports efficient (seamless) inter-technology mobility
between LTE and HRPD with the following requirements:

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Sub 300ms bearer interruption
Inter-technology handoff between 3GPP E-UTRAN and HRPD
Intra-technology handoff between an HSGW and an existing PDSN
Support for inter-HSGW fast handoff via PMIPv6 Binding Update
E-UTRAN EPC Network Components
The E-UTRAN EPC network is comprised of the following components:
eNodeB
The eNodeB (eNB) is the LTE base station and is one of two nodes in the SAE Architecture user plane (the other is the
S-GW). The eNB communicates with other eNBs via the X2 interface. The eNB communicates with the EPC via the S1
interface. The user plane interface is the S1-U connection to S-GW. The signaling plane interface is the S1-MME
connection to MME.
Basic functions supported include:
Radio resource management, radio bearer control, and scheduling
IP header compression and encryption of user data stream
Selection of MME at UE attachment (if not determined by information sent from the UE)
Scheduling and transmission of paging messages (originated from the MME)
Scheduling and transmission of broadcast information (originated from the MME or OA&M)
Measurement & measurement reporting configuration for mobility and scheduling
Mobility Management Entity (MME)
The MME is the key control-node for the LTE access-network. The MME provides the following basic functions:
NAS
signalling
signalling security
UE access in ECM-IDLE state (including control and execution of paging retransmission)
Tracking Area (TA) list management
PGW and SGW selection
MME selection for handovers with MME change
SGSN selection for handovers to 2G or 3G 3GPP access networks
Terminates interface to HSS (S6a)

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Authentication
Bearer management functions including dedicated bearer establishment
HRPD access node (terminating S101 reference point) selection for handovers to HRPD
Transparent transfer of HRPD signalling messages and transfer of status information between E-UTRAN and
HRPD access, as specified in the pre-registration and handover flows
Serving Gateway (S-GW)
For each UE associated with the EPS, there is a single S-GW at any given time providing the following basic functions:
Terminates the interface towards E-UTRAN (S1-U)
Functions (for both the GTP-based and the PMIP-based S5/S8) include:
local mobility anchor point for inter-eNodeB handover
mobility anchoring for inter-3GPP mobility (terminating S4 and relaying the traffic between 2G/3G
system and P-GW)
ECM-IDLE mode downlink packet buffering and initiation of network triggered service request
procedure
lawful intercept
packet routing and forwarding
transport level packet marking in the uplink and the downlink (e.g. setting the DiffServ Code Point)
Accounting
Handling of Router Solicitation and Router Advertisement messages if PMIP based S5 and S8 are used
MAG for PMIP based S5 and S8
PDN Gateway (P-GW)
For each UE associated with the EPS, there is at least one P-GW providing access to the requested PDN. If a UE is
accessing multiple PDNs, there may be more than one P-GW for that UE. The P-GW provides the following basic
functions:
Terminates the interface towards the PDN (SGi)
PGW functions (for both the GTP-based and the PMIP-based S5/S8) include:
per-user packet filtering (e.g. deep packet inspection)
lawful intercept
UE IP address allocation
UL and DL service level charging, gating control, and service level rate enforcement
DL rate enforcement based on AMBR (Aggregate Max Bit Rate) and based on the accumulated MBRs
of the aggregate of SDFs with the same GBR QCI

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DHCPv4 and DHCPv6 functions (client, relay and server)
LMA for PMIP6

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Product Description
The HSGW terminates the eHRPD access network interface from the Evolved Access Network/Evolved Packet Core
Function (eAN/ePCF) and routes UE-originated or terminated packet data traffic. It provides interworking with the
eAN/ePCF and the PDN Gateway (P-GW) within the Evolved Packet Core (EPC) or LTE/SAE core network and
performs the following functions:
Mobility anchoring for inter-eAN handoffs
Transport level packet marking in the uplink and the downlink, e.g., setting the DiffServ Code Point, based on
the QCI of the associated EPS bearer
Uplink and downlink charging per UE, PDN, and QCI
Downlink bearer binding based on policy information
Uplink bearer binding verification with packet dropping of UL traffic that does not comply with established
uplink policy
MAG functions for S2a mobility (i.e., Network-based mobility based on PMIPv6)
Support for IPv4 and IPv6 address assignment
EAP Authenticator function
Policy enforcement functions defined for the Gxa interface
Robust Header Compression (RoHC)
Support for VSNCP and VSNP with UE
Support for packet-based or HDLC-like framing on auxiliary connections
IPv6 SLACC support, generating RAs responding to RSs
An HSGW also establishes, maintains and terminates link layer sessions to UEs. The HSGW functionality provides
interworking of the UE with the 3GPP EPS architecture and protocols. This includes support for mobility, policy control
and charging (PCC), access authentication, and roaming. The HSGW also manages inter-HSGW handoffs.

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Figure 1. eHRPD Basic Network Topology
Internet
Enterprise
eAN/ePCF A10/A11
SGi
eHRPD S2a Gxa
STa
S-GW
S1-U
S5/S8
S11 Gx
Gxc
S1-MME
eNodeB
S6a
MME
PCRF
3GPP
AAA
S6b
SWx
HSS
OFCS
Rf
Rf
S101 S103
P-GW
OCS
Gy
HSGW
Basic Features
Authentication
The HSGW supports the following authentication features:

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EAP over PPP
UE and HSGW negotiates EAP as the authentication protocol during LCP
HSGW is the EAP authenticator
EAP-AKA’ (trusted non-3GPP access procedure) as specified in TS 33.402
EAP is performed between UE and 3GPP AAA over PPP/STa
For more information on authentication features, refer to the Network Access and Charging Management Features
section in this overview.
IP Address Allocation
The HSGW supports the following IP address allocation features:
Support for IPv4 and IPv6 addressing
Types of PDNs - IPv4, IPv6 or IPv4v6
IPv6 addressing
Interface Identifier assigned during initial attach and used by UE to generate it’s link local address
HSGW sends the assigned /64 bit prefix in RA to the UE
Configure the 128-bits IPv6 address using IPv6 SLAAC (RFC 4862)
Optional IPv6 parameter configuration via stateless DHCPv6(Not supported)
IPv4 address
IPv4 address allocation during attach
Deferred address allocation using DHCPv4(Not supported)
Option IPv4 parameter configuration via stateless DHCPv4(Not supported)
Quality of Service
The HSGW supports the following QoS features:
HRPD Profile ID to QCI Mapping
DSCP Marking
UE Initiated Dedicated Bearer Resource Establishment
QCI to DSCP Mapping
For more information on QoS features, refer to the Quality of Service Management Features section in this overview.

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AAA, Policy and Charging
The HSGW supports the following AAA, policy and charging features:
EAP Authentication (STa)
Rf Diameter Accounting
AAA Server Groups
Dynamic Policy and Charging: Gxa Reference Interface
Intelligent Traffic Control
For more information on policy and charging features, refer to the Network Access and Charging Management Features
section in this overview.