Table 102: Erps Request/State Priority - Edge-Core ECS2100-10T Reference Manual

10/28-port web-smart pro gigabit ethernet switch

Hide thumbs Also See for ECS2100-10T:

Table of Contents

While an existing forced switch request is present in a ring, any new forced

switch request is accepted, except on a ring node having a prior local forced

switch request. The ring nodes where further forced switch commands are

issued block the traffic channel and R-APS channel on the ring port at which

the forced switch was issued. The ring node where the forced switch command

was issued transmits an R-APS message over both ring ports indicating FS. R-

APS (FS) messages are continuously transmitted by this ring node while the

local FS command is the ring node's highest priority 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 102: 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 Command Usage section for the

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 condition.

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

| ERPS Commands

non-revertive

Show Quick Links

Table of Contents