SNR S2989G-48TX-DC [436/553] Interconnection ring model

Превью страниц Страница 436 / 553

S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-37

Major ring 1

Sub-ring 3

Major ring 2

g) When the node C received the packets sent by RPL owner node, it will relieve

the block of the local port and stop sending R-APS (NR) packets at the same

time. After RPL neighbor node A received this packet, it will block the port

connected to RPL. Other, all nodes will run the flush FDB after received the

packets.

7.5.1.2.3 Interconnection Ring Model

ERPS protocol can support the protection and switching of the interconnection

ring. The interconnection ring includes two types: the interconnection ring model with

virtual channel and the interconnection ring model without virtual channel.

1. The interconnection ring model with virtual channel

As shown in Fig 7-18, three ring networks are interconnection. 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 another major ring, it is

made up with the ring nodes C, D, E, F and the links of them. When ring 2 is health, it will

block the link between node C and D. ring 3 is a sub ring, it is made up with the nodes B,

C, F, G and the links of B-C and G-F. 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 2. Ring 1 and

ring 2 are both the close ring network, ring 3 is not a ring network. If treat ring 1 as the

link between the interconnection nodes B and G of ring 3 (virtual channel), and treat ring

2 as the link between the interconnection nodes C and F of ring 3 (virtual channel), ring 3

will be a ring network.

Figure 7-18 the interconnection ring topology with virtual channel

The R-APS virtual channel supported by ring 1 and ring 2 treats ring 3 protocol

packets as the data packets. The transmission method of the packets is same as the

method of data packets. The node B of ring 3 sends and receives the ring 3 erps protocol

packets sent by node G, at the same time, the node G sends and receives the ring 3 erps

protocol packets sent by node B. For distinguishing the erps packets of ring 3 and the

erps packets of this major ring in ring 1 and ring 2, different control vlan can be used to

the protocol packets transmission of every ring.