SNR S2989G-48TX-DC [437/553] Erps application

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S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-38

Major ring 1

Sub-ring 3

Sub- ring 2

When the sub ring 3 is changing, it should notify ring 1 and ring 2. The node on the

major ring will run flush FDB. The topology changing of the major ring 1 and ring 2 will

not affect the sub ring 3. Other, the topology changing of the major ring 1 and ring 2 will

not affect each other either.

2. The interconnection ring model without virtual channel

Change the way to understand the ring network as shown in Fig 7-19: ring 1 is the

major ring and it is made up with the ring nodes A, B, G, H and the links of them. When

ring 1 is health, it will block the link between nodes A and B. ring 2 is sub ring, it is made

up with the ring nodes C, D, E, F and the links of C-D, D-E and E-F. When ring 2 is health,

it will block the link between node C and D. ring 3 is another sub ring, it is made up with

the nodes B, C, F, G and the links of B-C, C-F and F-G. When ring 3 is health, it will block

the link of B-C. B-G links are the interconnection links of ring 1 and ring 3 and it belongs

to ring 1. C-F links are the interconnection links of ring 2 and ring 3 and it belongs to ring

3. Ring 1 is the close ring network; ring 2 and ring 3 are not the ring network.

Figure 7-19 the interconnection ring topology without virtual channel

Although ring 2 and ring 3 are not ring network neither, the erps packets of these two

sub ring need to be transmitted to all ring nodes. So, the block link should still transmit

erps protocol packets if the links of B-C and C-D are blocked, and the nodes B, C and C,

D of the block link should also receive and send the erps protocol packets.

When the sub ring 3 is changing, it should notify ring 1. The node on the major ring

will run flush FDB. The topology changing will not affect the sub ring 2. When the sub ring

2 is changing, it will affect the sub ring 3 and the major ring 1. The node on the major ring

should run flush FDB. But, the topology changing of the major ring 1 will not affect the

sub ring 2 and ring 3.

7.5.1.3 ERPS Application

ERPS is used for ring network and it is located in convergence layer, the

convergence loop can complete the layer2 convergence of business; insert the layer3