Table 30: Erps Request/State Priority - Edge-Core ECS4620-28T Quick Start Manual

28/52-port l3 stackable gigabit ethernet switch

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command. As such, two or more forced switches are allowed in the

ring, which may inadvertently cause the segmentation of an ring. It

is the responsibility of the operator to prevent this effect if it is

undesirable.

Ring protection requests, commands and R-APS signals have the

priorities as specified in the following table.

Table 30: ERPS Request/State Priority

Request / State and Status

local clear SF

R-APS (NR, RB)

If an Ethernet Ring Node is in the Forced Switch state, local SF is ignored.

Recovery for forced switching under revertive and non-revertive

mode is described under the Revertive parameter.

When a ring is under an FS condition, and the node at which an FS

command was issued is removed or fails, the ring remains in FS

state because the FS command can only be cleared at node where

the FS command was issued. This results in an unrecoverable FS

When performing a maintenance procedure (e.g., replacing,

upgrading) on a ring node (or a ring link), it is recommended that FS

commands be issued at the two adjacent ring nodes instead of directly

issuing a FS command at the ring node under maintenance in order to

avoid falling into the above mentioned unrecoverable situation.

| Basic Administration Protocols

Ethernet Ring Protection Switching

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