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Chapter 1
The BPX Switch: Functional Overview
The statistics are collected in real-time throughout the network and forwarded to the Cisco WAN
Manager workstation for logging and display. The link from the node to the Cisco WAN Manager
workstation uses a protocol to acknowledge receipt of each statistics data packet.
For more details on statistics and statistical alarms, refer to the Cisco WAN Manager User's Guide.
Node Synchronization
A BPX service switch network provides network-wide, intelligent clock synchronization. It uses a
fault-tolerant network synchronization architecture recommended for Integrated Services Digital
Network (ISDN). The BPX switch internal clock operates as a Stratum 3 clock per ANSI T1.101.
Because the BPX switch is designed to be part of a larger communications network, it is capable of
synchronizing to higher-level network clocks as well as providing synchronization to lower-level
devices. You can configure any network access input to synchronize the node. Any external T1 or E1
input can also be configured to synchronize network timing.
A clock output allows synchronizing an adjacent IGX switch or other network device to the BPX switch
and the network. In nodes equipped with optional redundancy, the standby hardware is locked to the
active hardware to minimize system disruption during system switchovers.
The following are the sources used to configure the BPX Service Node to select the clock:
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Switch Software Description
The Cisco WAN switching cell relay system software shares most core system software, as well as a
library of applications, between platforms. System software provides basic management and control
capabilities to each node.
BPX node system software manages its own configuration, fault-isolation, failure recovery, and other
resources. Because no remote resources are involved, rapid response to local problems. This distributed
network control, rather than centralized control, provides increased reliability.
Software among multiple nodes cooperates to perform network-wide functions such as trunk and
connection management. The multiprocessor approach ensures rapid response with no single point of
failure. System software applications provide advanced features that you can install and configure as
required.
The following are the software features:
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Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
External (T1/E1)
Line (DS3/E3)
Internal
Automatic routing of connections (Automatic Routing Management feature).
Various Classes of Service that may be assigned to each connection type (Advanced CoS
Management).
Bandwidth reservation on a time-of-day basis.
Detection and control of network congestion with ABR with VS/VD or Optimized Bandwidth
Management (ForeSight) algorithms.
Cisco BPX 8600 Series Installation and Configuration
Switch Software Description
1-29
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Table of Contents
Troubleshooting
