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Contents
- ISG Subscriber Aware Ethernet
- Finding Feature Information
- Prerequisites for ISG Subscriber Aware Ethernet
- Restrictions for ISG Subscriber Aware Ethernet
- Information About ISG Subscriber Aware Ethernet
- How to Configure ISG Subscriber Aware Ethernet
- Configuration Examples for ISG Subscriber Aware Ethernet
- Additional References
- Feature Information for ISG Subscriber Aware Ethernet
ISG Subscriber Aware Ethernet
The ISG Subscriber Aware Ethernet feature provides Intelligent Services Gateway (ISG) functionality in distributed IP and PPPoE sessions on Cisco 7600 series routers that have SIP-400 or Ethernet Services Plus (ES+) access-facing line cards.
- Finding Feature Information
- Prerequisites for ISG Subscriber Aware Ethernet
- Restrictions for ISG Subscriber Aware Ethernet
- Information About ISG Subscriber Aware Ethernet
- How to Configure ISG Subscriber Aware Ethernet
- Configuration Examples for ISG Subscriber Aware Ethernet
- Additional References
- Feature Information for ISG Subscriber Aware Ethernet
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for ISG Subscriber Aware Ethernet
You understand the following:
- High availability (HA)
- In-service software upgrades (ISSU)
- Session maintenance control
- Port-Bundle Host Key (PBHK)
- Layer 4 redirect (L4RD)
- Accounting
- Access control lists (ACL)
- Quality of service (QoS)
For information on how ISG works with these and other features, see the Cisco IOS ISG Configuration Library.
Hardware
The following hardware must be installed on the Cisco 7600 series routers:
- Cisco SIP-400 line card with Cisco Gigabit Ethernet V2 shared port adapter (SPA)
- Cisco Ethernet Services Plus (ES+) line card
- Cisco RSP720 Route Switch Processor (required) and with 4 gigabytes of memory (recommended)
RADIUS and policy servers are not mandatory. However, a typical implementation of ISG on a Cisco 7600 series router requires an off-box RADIUS authorization, authentication, and accounting (AAA) server, that is, a separate physical server storing AAA information.
Restrictions for ISG Subscriber Aware Ethernet
The following ISG features are not available on the Cisco 7600 series routers:
 Note | For more information about the access interface, see the "IP Subscriber Awareness over Ethernet" chapter in the Cisco 7600 Series Cisco IOS Software Configuration Guide . |
- Subscriber redundancy is available on 1:1 access standby model only.
- Load balancing is not supported for IP and PPPoE subscribers.
- Interface statistics on a multiservice interface (MSI).
- Traffic classes are not supported. Because traffic classes cannot be configured on the Cisco 7600 series router, some features (accounting, idle timeout, session timeout, policer, and L4RD) that can be applied at a flow level on other routers must be applied at a session level on the Cisco 7600 series router.
- L4RD and PBHK functionality are implemented at the Route Processor (RP) level.
- Prepaid functionality.
- Dynamic subscriber bandwidth selection (DBS).
- The following restrictions apply to ISG HA features:
- Ambiguous VLAN support for PPPoE sessions only.
- Lawful intercepts on access subinterfaces in IP and PPPoE sessions.
- Session grouping.
Note the following information about statistical polling on the Cisco 7600 series router:
- Statistics are sent from the line card to the router every 10 seconds. Therefore, statistics are delayed by 10 seconds on each poll.
- The lower limit for idle timeout values and keepalive intervals is 30 seconds.
The segment switching manager (SSM) infrastructure does not disconnect sessions even when the SPA is removed in compliance with Cisco Online Insertion and Removal (OIR) unless the configuration is also removed. To ensure that a session is disconnected in that case, you must configure the session keepalive feature or use the clear ip subscriber slot slotnum no-hardware command to clear the sessions manually when a line card or SPA is OIR removed.
The following table shows whether sessions are reprovisioned (that is, reprogrammed on the line card after the OIR insert) or terminated on the router after various line-card, interface, and configuration events.
| Table 1 | Event Statistics |
|
Event |
Reprovision |
Disconnect |
|---|---|---|
|
Line card or SPA OIR insert |
Yes |
No |
|
Line card or SPA OIR removal |
No |
No |
|
Line card reload |
Yes |
No |
|
Interface admin down |
No |
No |
|
Interface down |
No |
No |
|
Configuration removed on subscriber interface |
No |
Yes |
For more information about OIR support in routers, see Cisco Online Insertion and Removal (OIR) Support in Routers.
Information About ISG Subscriber Aware Ethernet
Supported Access Interfaces
Note | The access keyword is specific for Cisco 7600 series routers. |
The port channel is on 1:1 redundancy and Link Aggregation Control Protocol (LACP) is enabled to allow dynamic handling of member links in a port channel bundle. The port channel has two members, of which one member is active and the other is in standby state. The member ports can be across line cards but must originate from Ethernet Services Plus (ES+) line card.
For information about access interfaces see the "IP Subscriber Awareness over Ethernet" chapter in the Cisco 7600 Series Cisco IOS Software Configuration Guide .
Supported PPP Sessions
Note | In Cisco IOS Release 12.2(33)SRC, PPP and IP sessions are supported only on Ethernet interfaces on the Cisco 7600 series router. |
Supported Services
- Idle timeout
- Session timeout
- Internet Control Message Protocol (ICMP) and Address Resolution Protocol (ARP) keepalive for IP sessions
- Conditional debugging (supported on routers but not on line cards)
- Dynamic virtual private network (VPN) selection
- Limited PBHK and L4RD
- Policy control: policy server--change of authorization (CoA) ASCII command code support
- QoS
- Session accounting
- Security: per user ACL
How to Configure ISG Subscriber Aware Ethernet
For information on configuring ISG: Subscriber Aware Ethernet on Cisco 7600 series routers, see the "IP Subscriber Awareness over Ethernet" chapter of the Cisco 7600 Series Cisco IOS Software Configuration Guide .
Additional References
Related Documents
MIBs
Technical Assistance
|
Description |
Link |
|---|---|
|
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Feature Information for ISG Subscriber Aware Ethernet
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 2 | Feature Information for ISG: Subscriber Aware Ethernet |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
ISG: Subscriber Aware Ethernet |
12.2(33)SRC 15.0(1)S |
The ISG: Subscriber Aware Ethernet feature provides Intelligent Services Gateway (ISG) functionality in distributed IP and PPPoE sessions on Cisco 7600 series routers having SIP-400 access-facing line cards. In 12.2(33)SRC, this feature was introduced on the Cisco 7600 series routers. The following commands were introduced or modified: clear ip subscriber , show ccm clients , show ccm queues , show ccm sessions , show ip subscriber . |
|
ISG: Session: Multicast: Coexistance |
12.2(33)SRE |
In Cisco IOS Release 12.2(33)SRE, ISG Session Multicast Coexistence feature support was added on Cisco 7600 series routers. |
|
IP Session support on the Cisco 7600 ES+ Series Line Cards |
12.2(33)SRE |
In Cisco IOS Release 12.2(33)SRE, IP and PPPoE Sessions support for ES+ Series Line Cards was added on Cisco 7600 series routers. |
|
PPPoE and IPoE Session Support on Port Channel (1:1 Redundancy) |
12.2(33)SRE |
In Cisco IOS Release 12.2(33)SRE, PPPoE and IPoE Sessions Support for Port Channel was added on Cisco 7600 series routers. |
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