АМАТЕК AN-SGM28P24-400 [130/322] Link down alarm

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two ports belong to this ring Control VLAN and Protected VLAN all. Through the Primary Port

and Secondary Port connections of each EAPS node device, all nodes in the EAPS Domain

compose a EAPS ring。

Under normal circumstances, when EAPS Domain and Secondary Port all Primary Port

LINK UP, Master Node Secondary Port (blocking the Secondary Port port state Blocking),

cancellation of business data EAPS in the Domain. When EAPS Domain fails, the Secondary port

of Master Node is opened immediately (the state of the Secondary Port is Forwarding), allowing it

to forward the business data and resume the normal forwarding of the service data。

Transit Node doesn't make any difference to Primary Port and Secondary Port processing。

Two fault checks and loop recovery of EAPS are described below：

9.3.1Link-Down alarm

When Transit Node finds that its Primary Port or Secondary Port port appears LINK DOWN,

it will send a LINK-DOWN protocol package to Master Node via another LINK UP port

immediately from Control VLAN

When Master Node receives this LINK-DOWN protocol package：

Master Node Complete Failed immediately by the state to enter the state, open the Secondary

Port (the Secondary Port state Forwarding), refresh two or three own forwarding, send a

notification to the EAPS RING-DOWN-FLUSH-FDB Domain other Transit to refresh its

forwarding table, re learning the two or three layer forwarding。

When Master Node finds that the local Primary Port occurs LINK DOWN, its operation is

the same as that of the LINK-DOWN protocol packet。

When the Master Node Secondary Port found that the local LINK DOWN, Master Node

Complete Failed immediately by the state to enter the state, refresh two or three own forwarding,

sending RING-DOWN-FLUSH-FDB packets, EAPS Domain notify the other Transit to refresh its

forwarding table, re learning the two or three layer forwarding。

9.3.2 Loop inspection

Master Node periodically sends HEALTH protocol packages from Primary Port. If the loop

is complete, Master Node can receive the HEALTH protocol package in its own Secondary Port,

when Master Node restarts its Fail-period timer, and the Master Node state is Complete。

If the fail-period is not received before the expiration of their HEALTH packets, Master

Node will leave the Complete state into the Failed state Port (Secondary open Secondary Port state