АМАТЕК AN-SGM28P24-400 [144/322] Link and channel

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intersection node: in the intersection of ERPS loop, nodes belong to multiple rings called the

intersection node; (2) non intersection nodes: the intersection of the ERPS ring, the node only

belongs to a ERPS ring is called non intersection node。

There are three types of node modes in ERPS protocol: RPL owner node, RPL neighbour

node and common ring node。(1) RPL owner nodes: a ERPS ring is only a RPL owner node,

determined by user configuration, to prevent loop in the ERPS ring by blocking the RPL port,

when the RPL owner node receives a fault message that other node or link failure on the ERPS

ring, will automatically open RPL port, the port receiving recovery and send traffic, ensure the

flow will not be interrupted; (2) RPL neighbour node: node is directly connected with the RPL

owner node RPL port, under normal circumstances, the RPL owner node RPL port and RPL

neighbour node RPL port will be blocked, in order to prevent the loop from occurring. When the

ERPS ring failure, RPL owner node RPL port and RPL neighbour node RPL port will be released;

(3): ordinary ring node in the ERPS ring, the nodes except RPL owner nodes and RPL neighbour

nodes are ordinary ring node, RPL port and port of ordinary ordinary ring ring node there is no

difference between ordinary port link state ring ring node responsible for monitoring their direct

ERPS protocol, and to change the message link state timely notify other nodes；

10.2.3 Link and channel

(1) RPL (Ring Protection Link): each ERPS ring has only one RPL, that is, the RPL port of

the RPL owner node is located at the link. When the Ethernet ring is in the Idle state, the RPL link

is in a blocking state and does not forward the data packet to avoid forming the loop；

(2)

Sub loop link: in the intersection ring, belonging to the sub ring, link by loop control；

(3)

RAPS (Ring Auto Protection Switch) virtual channel: in the intersection ring, the

intersection nodes are used to transfer the ring protocol message, but the path not belonging to the

sub ring is called the RAPS virtual channel of the ring。

10.2.4 ERPS VLAN

There are two types of VLAN: (1) RAPS VLAN in ERPS, which are used to transfer ERPS

protocol packets, and the ports that access the ERPS ring on the device belong to the RAPS

VLAN, and only the ports accessing the ERP ring can join the VLAN. RAPS VLAN of different

rings must be different. RAPS VLAN interface is not allowed to configure IP address; (2) data

VLAN: relative to RAPS VLAN, data VLAN is used to transmit data packets, data VLAN can

include ERP ring port, also can include non ERP ring port。