Allied Telesis 8000/8POE manual Collapsed Backbone

Chapter 1: Overview

Collapsed Backbone

In the topology illustrated in Figure 5, an AT-9424T Gigabit Ethernet Switch forms the backbone that connects to servers and AT-8000/8POE Fast Ethernet switches using Gigabit Ethernet uplinks. This type of topology is often referred to as a collapsed backbone topology. The switch functions as the focal point of the network and transfers an Ethernet frame between the Fast Ethernet switches only when the destination end node for the frame is on a different switch than the end node that originated the frame. This reduces the amount of unnecessary data traffic in each workgroup, freeing up bandwidth and improving network performance.

AT-9424T
1	3	5	7	9	11	13	15	17	19	21R	23R																			AT-9424TGigabit Ethernet Switch
													CLASS 1				PORT ACTIVITY
																1000 LINK /	ACT	10/100 LINK /		ACT										SFP	TERMINAL	STATUS
													LASER PRODUCT		L/A
															D/C	FDX		HDX /	COL	1	3	5	7	9	11	13	15	17	19	L/A	PORT
																														21R 23R
													SFP							L/A										21		FAULT
																				D/C										22		MASTER
																				L/A										23
																				D/C										24		POWER
2	4	6	8	10	12	14	16	18	20	22R	24R	21	22	23	24					2	4	6	8	10	12	14	16	18	20	22R 24R

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AT-8000/8POE

AT-8000/8POE	1	3	5	7		MAIN PORT ACTIVITY
8 Port POE Fast Ethernet Switch
PoE
					9
	POWER						UPLINK PORT ACTIVITY
	2	4	6	8	9R

1 3 5 7

PORT

10/100/1000 -T

SFP

2 4 6 8 9R 9

RS-232 TERMINAL PORT

AT-8000/8POE

AT-8000/8POE	1	3	5	7		MAIN PORT ACTIVITY
8 Port POE Fast Ethernet Switch
PoE
					9
	POWER						UPLINK PORT ACTIVITY
	2	4	6	8	9R

1	3	5	7
					PORT
				10/100/1000 Base-T
2	4	6	8	9R	9

RS-232 TERMINAL PORT

820 820

Wireless Network

Legend

10 Mbps

100 Mbps

1000 Mbps

Figure 5. Collapsed Backbone Topology

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