Cisco Systems OL-4387-02 manual Default Network, Access Protocols

Chapter 1 Service Selection Gateway Overview

Service Selection Gateway

Default Network

The default network is a location that SSG allows unauthenticated users to access. The default network is a single IP address or subnet, typically the IP address of the SESM application although other types of servers can also be defined as the default network. The default network supports the port-bundle host key.

The default network enables special processing of traffic to and from the default network. Because traffic to and from SESM requires special processing and the Cisco 10000 series router cannot distinguish between SESM and non-SESM traffic, we recommend that you define the SESM server as the default network and place other servers in the Open Garden network.

Note Traffic to and from a non-SESM server does not require special processing.

The SSG typically forwards packets to and from the default network through the router’s PXF forwarding engine. However, SSG also forwards default network traffic through the route processor (RP) as follows:

Packets from a User and Destined for the Default Network

If the port-bundle host key is:

•Enabled—SSG forwards the packets through the RP.

•Disabled—SSG forwards the packets through the PXF forwarding engine.

Packets from the Default Network and Destined for an SSG User

•SSG forwards the packets through the RP if either of the following conditions are met:

–The port-bundle host key is enabled.

–The port-bundle host key is disabled, TCP is the transport protocol, and the packets are associated with an active TCP redirect mapping.

•Otherwise, SSG forwards the packets through the PXF forwarding engine.

Access Protocols

On the subscriber side of the network, the Cisco 10000 series router supports SSG features for the following protocols and encapsulations:

•PPPoE

•PPPoA

•RBE

•RFC 2684 IP

On the network side, the router supports receiving SSG traffic on the following interface types:

•ATM PVCs and subinterfaces

•Ethernet interfaces and subinterfaces

•POS interfaces

•Serial and channelized interfaces

Cisco 10000 Series Router Service Selection Gateway Configuration Guide

OL-4387-02 1-3