Cisco MGX 8850 (PXM1E/PXM45) Configuration Manual page 59

Chapter 1 Preparing for Configuration
Core Switch
Figure 1-1
Figure 1-1
MGX 8850
(PXM45)
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.
Typically, Cisco MGX 8850 (PXM45) and Cisco MGX 8950 switches are deployed in the network core,
Note
whileCisco MGX 8830, Cisco MGX 8850 (PXM1E) and the Cisco 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.
Multiservice Edge Aggregation
Figure 1-2
Figure 1-2
(Cisco or third-party)
ATM edge devices
(Cisco or third-party)
Frame data
ATM data
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
shows the switch operating in a core switch topology.
Core Switch Topology
Core ATM network
Cisco
shows an MGX switch operating in a multiservice edge aggregation topology.
Multiservice Edge Aggregation Topology
ATM router
UNI or
NNI
Voice
Cisco
MGX 8850
(PXM1)
Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Cisco
MGX 8850
(PXM1E)
Core ATM
network
Broadband trunks
Typical Topologies
1-11