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Chapter 1
Service Selection Gateway Overview
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.
Traffic to and from a non-SESM server does not require special processing.
Note
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:
•
•
Packets from the Default Network and Destined for an SSG User
•
•
Access Protocols
On the subscriber side of the network, the Cisco 10000 series router supports SSG features for the
following protocols and encapsulations:
•
•
•
•
On the network side, the router supports receiving SSG traffic on the following interface types:
•
•
•
•
OL-4387-02
Enabled—SSG forwards the packets through the RP.
Disabled—SSG forwards the packets through the PXF forwarding engine.
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.
PPPoE
PPPoA
RBE
RFC 2684 IP
ATM PVCs and subinterfaces
Ethernet interfaces and subinterfaces
POS interfaces
Serial and channelized interfaces
Cisco 10000 Series Router Service Selection Gateway Configuration Guide
Service Selection Gateway
1-3
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