Specifications

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Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 1 Preparing for Configuration
Typical Topologies
Release 5.1 of the MGX 8850 (PXM1E), MGX 8830, and Cisco 8830/B switches supports the following
topologies:
• 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.
Note Typically, MGX 8850 (PXM45), MGX 8850/B, MGX 8830/B, and MGX 8950 switches are deployed in
the network core, while MGX 8830 and MGX 8850 (PXM1E) and the MGX 8880 Media Gateway are
deployed at the network edge.
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)