A P P E N D I X B

SSG Implementation Notes

Table B-1provides information about how SSG is implemented on the Cisco 10000 series router. For additional information about general SSG limitations, see the “SSG Restrictions” section on page 1-4, the “SSG Prerequisites” section on page 1-6, and also see Chapter 2, “Scalability and Performance.”

Table B-1 SSG Implementation Notes for the Cisco 10000 Router

SSG Feature

Implementation Notes

ACLs and QoS

ACL and QoS are applied even if the traffic is to or from an Open Garden or the

 

default network (when port-bundle host key is not enabled).

 

Service ACLs cannot be applied to a connection. The connection will remain

 

active, but the ACLs will have no effect.

 

Modular QoS CLI (MQC) is not supported on SSG interfaces. If an MQC service

 

policy is configured on an SSG interface, SSG ignores the policy.

 

See the “Restrictions for SSG Hierarchical Policing” section on page 8-2for

 

additional implementation information.

 

 

AutoDomain

You must enable Cisco Express Forwarding (CEF) before you enable SSG

 

functionality.

 

Passthrough services are available only for services that perform authentication

 

(for example, proxy or VPDN services). This is because AutoDomain bypasses

 

the local authentication that is performed at the network access server (NAS).

 

DHCP requests for IP address assignment must be done before RADIUS

 

negotiation.

 

If an Access-Request does not contain an IP address, you must configure a local

 

per-domain or global IP address pool.

 

“Virtual-user” profiles can contain only one AutoLogon service.

 

 

L2TP

Not supported.

 

SSG attempts to set up the tunnel, but does not set up the VRF for tunnel services.

 

Therefore, traffic is not forwarded to the tunnel. The same applies to L2TP dialout.

 

 

Logon

A user cannot log on to services on different uplink interfaces. All services that

 

the user connects to must be on the same interface. This is because a user can

 

connect to only one VRF, and in SSG one VRF is used for each uplink interface.

 

To connect to a different service, the user has to logoff from the current service,

 

and log on to the other service.

 

 

Cisco 10000 Series Router Service Selection Gateway Configuration Guide

 

OL-4387-02

B-1

 

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Cisco Systems OL-4387-02 manual SSG Implementation Notes, SSG Feature Implementation Notes