Specifications

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Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 1 Preparing for Configuration
Typical Topologies
Typical Topologies
Release 2.1 of the Cisco MGX 8850 and the Cisco MGX 8950 switches support the following
topologies:
• Core switch
• Multiservice edge aggregation
• DSL edge aggregation
Core Switch
Figure 1-1 shows the switch operating in a core switch topology.
Figure 1-1 Core Switch Topology
In the core switch topology, the switch works with other ATM switches to transfer broadband ATM
traffic from one ATM edge device to another. The core acts like a freeway, and the edge devices act like
freeway on-ramps.
The Cisco MGX 8850 and the Cisco MGX 8950 switches support the following types of trunks: T1 and
E1 (Cisco MGX 8850 only), DS3, E3, OC-3, OC-12, OC-48, STM-1, STM-4, and STM-16. Typically,
core edge nodes communicate with multiple external nodes over relatively slow broadband trunks such
as DS3, OC-3, and STM-1 trunks. The internal core node communicates with other core nodes using
relatively fast links such as OC-12, OC-48, and STM-16 trunks.
Core ATM network
38410
Cisco
MGX 8850
(PXM45)