Beta Draft Confidential
Overview
SVCs
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/051-5
The following chapters describe basic SVC concepts and configuration:
• Chapter 16 provides an overview of SVC concepts. Read this chapter if you are
unfamiliar with SVC address formats and registration or need more information
on route determination or address translation. This chapter also describes how to
use network ID addressing.
• Chapter 17 describes how to configure SVC node and port prefixes and port
addresses for each SVC address format. This chapter includes information on
configuring network identifier addressing.
The following sections describe optional SVC features you can use in your network to
take advantage of ATM signaling functions.
SVC Proxy Signaling
Chapter 17 describes SVC proxy signaling. SVC proxy signaling is an optional
feature for the CBX 3500, CBX 500 and GX 550 switches that enables a single
signaling entity to signal on behalf of multiple endpoints. You can use proxy signaling
to allow end systems that do not understand ATM signaling to set up SVCs via a proxy
signaling agent (PSA). The PSA performs all signaling functions on behalf of the end
system, known as the proxy signaling client (PSC).
SPVCs
Chapter 18 describes soft permanent virtual circuits (SPVCs), also called Offnet
Circuits. The network uses signaling to establish an SPVC. The NMS provisions one
end of the SPVC with the address identifying the egress interface from the network.
Once the SPVC configuration is in place, the switch at one end of the SPVC initiates
the signaling. This calling end is responsible for establishing, releasing, and
re-establishing the SVC request.
CUGs
Chapter 19 describes closed user groups (CUGs). You can use CUGs to divide all
SVC network users into logically linked groups of users. Members of the same CUG
have particular calling privileges that members of different CUGs may not have.
CUGs form one level of security between users of a network, allowing only those
users who are members of the CUG to set up calls to each other. Information about
CUG membership and rules is available throughout the network.
Port Security Screening
Chapter 20 describes Port Security Screening. This feature is a mechanism you can
use to ensure that the network cannot be compromised by unauthorized SVC access.
You do this by creating screens that can allow/disallow incoming and outgoing SVCs.
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