Cisco Systems OL-4387-02 manual Service Selection Gateway Overview SSG Restrictions

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Chapter 1 Service Selection Gateway Overview

SSG Restrictions

•The Cisco 10000 router’s SSG software and forwarding software handle multiple users attached to a single Cisco IOS software interface in different ways, which could result in users receiving services that they did not select. After the first user logs on, all subsequent user logon attempts are rejected.

Although the logon is rejected and thus the ability to select services, all users can access the services to which the first user is subscribed. User traffic is not rejected, only the user’s authorization attempt. The traffic from all users is logged in the statistics of the first user. The traffic to the user is treated as transparent passthrough and is forwarded to the user, but it does not affect SSG accounting. If you enter the ssg show host command, statistics are displayed for the first user only.

•For users attached to multipoint interfaces on the access side, the Cisco 10000 router authorizes the first user and then rejects the authorization attempts of subsequent users. The router only rejects the authorization attempts, not the user traffic. The router treats all subsequent users as the first user logged on, allowing access to the services to which the first user is subscribed. However, subsequent users cannot select services. The traffic from all users is logged in the statistics of the first user. Traffic to the second and subsequent users is treated as transparent passthrough and is forwarded to these users, but it does not affect the SSG accounting. The ssg show host command displays the first user.

•Each private service is associated with its own VRF; global services are associated with the same VRF. The default network and Open Garden network are typically added to all VRFs, except if the network addresses overlap addresses in the private IP network or the Open Garden network is explicitly bound to an uplink interface. The default network addresses must also be associated with the global Cisco IOS VRF.

•You can apply a service to a next-hop address or to an interface. The interface must be a non-broadcast interface. For example, an interface with multipoint PVCs or Ethernet without VLANs is not supported.

•You can apply services with overlapping addresses to the same next-hop address. Services that have overlapping addresses cannot be bound to different next-hop addresses if the next-hop addresses resolve to the same interface.

•All services that share an uplink interface must not have overlapping addresses. Normally, a service defined to include a route of 0.0.0.0 with a subnet mask of 0.0.0.0 overlaps with any other possible service. Therefore, the Cisco 10000 series router treats the route 0.0.0.0 with a subnet mask of 0.0.0.0 as a default route.

•You cannot configure the following interface types as an SSG uplink interface:

–Any interface requiring tunneling (for example, L2TP or GRE tunneling)

–Multilink PPP (MLPPP) interfaces

–Tag interfaces

–Load balanced interfaces

•For RBE and IP users, the addresses of services that share an uplink interface cannot overlap.

For information about the restrictions for a specific SSG feature, see the appropriate chapter in this guide.

Cisco 10000 Series Router Service Selection Gateway Configuration Guide

 

OL-4387-02

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Contents Corporate Headquarters Copyright 2004, Cisco Systems, Inc All rights reserved Iii N T E N T SConfiguration Example for SSG AutoDomain Configuration Example for SSG Open Garden Configuration of VPI/VCI Static Binding to a Service Profile Vii SSG UnconfigViii Audience About This GuideDocument Organization Document Conventions Obtaining Documentation Related DocumentationCisco.com Ordering Documentation Documentation FeedbackObtaining Technical Assistance Documentation CD-ROMXiii Cisco TAC WebsiteOpening a TAC Case TAC Case Priority DefinitionsXiv Obtaining Additional Publications and InformationService Selection Gateway Service Selection Gateway OverviewSSG Topology Example Access Protocols Default NetworkSSG Restrictions Supported SSG FeaturesService Selection Gateway Overview SSG Restrictions SSG Architecture Model SSG PrerequisitesService Selection Gateway Overview SSG Architecture Model OL-4387-02 Limitations and Restrictions Scalability and PerformanceScalability and Performance Limitations and Restrictions Single Host Logon SSG Logon and LogoffPrerequisites for Single Host Logon SSG Autologoff Configuration of SSG AutologoffRestrictions for SSG Autologoff Example 3-2 SSG Autologoff Using Icmp Ping SSG Prepaid Idle TimeoutConfiguration Example for SSG Autologoff Example 3-1 SSG Autologoff Using ARP PingService Reauthorization Service AuthorizationConfiguration Example for SSG Prepaid Idle Timeout Restrictions for SSG Prepaid Idle TimeoutPrerequisites for SSG Prepaid Idle Timeout Configuration of SSG Prepaid Idle TimeoutExample 3-6 SSG Threshold Time SSG Session and Idle TimeoutExample 3-5 SSG Service-Specific TCP Redirect Example 3-7 SSG Threshold VolumeExample 4-1 Radius Freeware Format Example Authentication and AccountingSSG Full Username Radius Attribute Restrictions for SSG Full Username Radius AttributeExample 4-4 Radius Accounting-Stop Record Account Login and LogoutRadius Accounting Records Example 4-3 Radius Accounting-Start RecordService Connection and Termination Authentication and Accounting Radius Accounting Records PPP Terminated Aggregation Service Selection MethodsPTA-Multidomain Restrictions for PTA-MD Web Service SelectionSesm and SSG Performance OL-4387-02 SSG AutoDomain Service ConnectionConfiguration Example for SSG AutoDomain Configuration of SSG AutoDomainRestrictions for SSG AutoDomain Example 6-2 AutoDomain Exclude Profile SSG VSA Format Example 6-1 SSG AutoDomainExample 6-3 AutoDomain Exclude File Format SSG Prepaid Configuration of SSG PrepaidRestrictions for SSG Prepaid SSG Open Garden Configuration Example for SSG PrepaidRestrictions for SSG Open Garden Configuration of SSG Open GardenConfiguration Example for SSG Open Garden SSG Port-Bundle Host KeyRestrictions for SSG Port-Bundle Host Key Prerequisites for SSG Port-Bundle Host Key Mutually Exclusive Service SelectionConfiguration of SSG Port-Bundle Host Key Exclude NetworksConfiguration of Mutually Exclusive Service Selection OL-4387-02 Downstream Access Control List Service ProfilesFull Username Upstream Access Control ListService Authentication Type Domain NameService Next-Hop Gateway Service-Defined CookieService Description Service ModeExample 7-1 Service Profile Cached Service ProfilesType of Service Service Profile ExampleConfiguration of Cached Service Profiles OL-4387-02 SSG Hierarchical Policing Overview SSG Hierarchical PolicingSSG Hierarchical Policing Token Bucket Scheme Restrictions for SSG Hierarchical Policing SSG Hierarchical Policing ConfigurationExample 8-2 Enabling Per-Session Policing on a Router Configuration Examples for SSG Hierarchical PolicingOL-4387-02 Transparent Passthrough Interface ConfigurationFor example Access Side InterfacesRestrictions of Transparent Passthrough Configuration of Transparent PassthroughMulticast Protocols on SSG Interfaces Network Side InterfacesConfiguration of Multicast Protocols on SSG Interfaces SSG TCP Redirect Redirection for Unauthenticated Users10-1 10-2 Redirection for Unauthorized Services10-3 Initial Captivation10-4 Configuration of SSG TCP RedirectRestrictions for SSG TCP Redirect Prerequisites for SSG TCP RedirectExample 10-1 Binding a Server Group to a Port 10-5Example 10-2 Limiting Redirected TCP Sessions 10-6 Configuring SSG TCP RedirectExample 10-4 Defining Network Lists Configuration Examples for SSG TCP Redirect10-7 Example 10-3 Defining a Captive Portal Server GroupExample 10-5 Defining Port Lists 10-8VPI/VCI Static Binding to a Service Profile Miscellaneous SSG Features11-1 11-2 AAA Server Group Support for Proxy ServicesConfiguration of Radius Virtual Circuit Logging Radius Virtual Circuit Logging11-3 Packet Filtering11-4 Downstream Access Control List-outaclUpstream Access Control List-inacl Restrictions for Packet FilteringRestrictions for SSG Unconfig SSG UnconfigConfiguration of Packet Filtering Configuration Example for Packet Filtering11-6 Prerequisites for SSG UnconfigConfiguration of SSG Unconfig Configuration Examples for SSG UnconfigService Translation SSG Enhancements for Overlapping Services11-7 11-8 11-9 Restrictions for Service Translation11-10 Configuration of Service Translation11-11 Expansion of Service IDs11-12 Network Sets12-1 Monitoring and Maintaining SSG12-2 Troubleshooting RadiusPer-Service Statistics Restrictions for Per-Service Statistics12-3 Monitoring the Parallel Express Forwarding Engine12-4 Figure A-1 SSG Example Topology SSG Configuration ExampleUsername cisco password 0 cisco clock timezone PST Example A-1 Cisco 10000 Router SSG ConfigurationSsg accounting interval 300 ssg profile-cache Full-duplex Peer default ip address pool SSG-POOL Exec-timeout 0 0 password lab SSG Implementation Notes SSG Feature Implementation NotesMpls Also see the Restrictions for SSG TCP Redirect section on OL-4387-02 GL-1 O S S a R YGL-2 GL-3 GL-4 GL-5 GL-6 IN-1 D EIN-2 DSL G-1IN-3 ISP G-2 L2TPIN-4 RadiusIN-5 Reauthorizing prepaidIN-6 TCPIN-7 VRF G-5 VSAIN-8
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