Juniper Networks JUNOS OS 10.4 - Manual (Page 200)

Ethernet ring port parameters for protection group pg101
Interface Control Channel Forward State Ring Protection Link End
ge-1/0/1 ge-1/0/1.1 forwarding Yes
ge-1/2/4 ge-1/2/4.1 forwarding No
Signal Failure Admin State
Clear IFF ready
Clear IFF ready
Note that the protection interface is now forwarding (so is the other interface).
user@router1> show protection-group ethernet-ring node-state
how protection-group ethernet-ring node-state
Ethernet ring APS State Event Ring Protection Link Owner
pg101 protected SF Yes
Restore Timer Quard Timer Operation state
disabled disabled operational
Note that Router 1 has recorded the span failure (SF).
user@router1> show protection-group ethernet-ring statistics group-name pg101
Ethernet Ring statistics for PG pg101
RAPS sent : 1
RAPS received : 1
Local SF happened: : 0
Remote SF happened: : 1
NR event happened: : 0
NR-RB event happened: : 1
Note that the R-APS messages have recorded the remote failure.
Under a failure condition, the other routers on the ring (Router 2 and Router 3) will see
the following similar output:
Router 2 and Router 3
Operational user@router2> show protection-group ethernet-ring aps
Ethernet Ring Name Request/state No Flush Ring Protection Link Blocked
pg102 SF No No
Commands (Failure
Condition)
Originator Remote Node ID
Yes 00:00:00:00:00:00
Note the failure event (SF). Router 3 will see almost identical information.
user@router2> show protection-group ethernet-ring interface
Ethernet ring port parameters for protection group pg102
Interface Control Channel Forward State Ring Protection Link End
ge-1/2/1 ge-1/2/1.1 forwarding No
ge-1/0/2 ge-1/0/2.1 discarding No
Signal Failure Admin State
Clear IFF ready
set IFF ready
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Junos OS 13.1 MX Series 3D Universal Edge Routers Solutions Guide