Tiered Networks 13-3
BPX Routing Hubs in a Tiered Network
BPX Routing Hubs in a Tiered Network
Tiered networks with BPX routing hubs have the capability of adding interface shelves/feeders
(non-routing nodes) to an IPX/IGX/BPX routing network (Figure 13-2). The MGX 8220 interface
shelf, and IPX or IGX nodes configured as interface shelves are connected to BPX routing hubs.
Interface shelves allow the network to support additional connections without adding additional
routing nodes.
The MGX 8220 supports frame T1/E1, X.21 and HSSI frame relay, ATM T1/E1, and CES, and is
designed to support additional interfaces in the future. The IPX interface shelf supports frame relay
ports, as does the IGX switch (option is available to configure as an interface shelf).
Figure 13-2 Tiered Network with BPX Routing Hubs
Tiered Network Implementation
The following requirements apply to BPX routing hubs and their associated interface shelves:
• MGX 8220 Release 4 level is required on all MGX 8220 interface shelves.
• Only one feeder trunk is supported between a routing hub and interface shelf.
• No direct trunking between interface shelves is supported.
• No routing trunk is supported between the routing network and interface shelves.
• The feeder trunks between BPX hubs and IPX or IGX interface shelves are either T3 or E3.
• The feeder trunks between BPX hubs and MGX 8220 interface shelves are T3, E3, or
OC3-c/STM-1.
• Frame Relay Connection management to an IPX interface shelf is provided by Cisco StrataView
Plus
Routing network
IPX
shelf
IPX
shelf
IGX
shelf
IPX
shelf
IPX
shelf
IPX
shelf
AXIS
shelf
AXIS
shelf
AXIS
shelf
AXIS
shelf
IPX
IGX
SV+ Workstation
(network management)
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
Frame Relay
CES
ATM T1/E1
ATM T1/E1
ATM T1/E1
CES
BPX
(routing
hub)
BPX
(routing
hub)
BPX
(routing
hub)
S5278
