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Example: Viewing Ethernet Ring Protection Status—Ring Failure Condition

This section assumes that Ethernet ring protection is configuring correctly, that Router 1 is the ring protection link (RPL) owner, and that there is a link failure between Router 2 and Router 3 in the configuration example.

Router 1 Operational Commands (Ring Failure Condition)


user@router1> show protection-group ethernet-ring aps
Ethernet Ring Name  Request/state  No Flush  Ring Protection Link Blocked  
pg101               SF             NO        No                           

Originator  Remote Node ID
No          00:01:02:00:00:01 

Note that the ring protection link is no longer blocked and the node is no longer marked as originator.


user@router1> show protection-group ethernet-ring interface
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 Commands (Failure Condition)


user@router2> show protection-group ethernet-ring aps
Ethernet Ring Name  Request/state  No Flush  Ring Protection Link Blocked  
pg102               SF             No        No                           

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

Note that the failed interface (ge-1/0/2.1) is not forwarding. Router 3 will see almost identical information.


user@router2> show protection-group ethernet-ring node-state
Ethernet ring    APS State    Event         Ring Protection Link Owner  
pg102            idle         NR-RB         No                          
  
Restore Timer  Quard Timer  Operation state
disabled       disabled     operational

Note that Router 2 is not the owner. Router 3 will see almost identical information.


user@router2> show protection-group ethernet-ring statistics group-name pg102
Ethernet Ring statistics for PG pg102
RAPS sent                        : 1
RAPS received                    : 1
Local SF happened:               : 1
Remote SF happened:              : 0
NR event happened:               : 0
NR-RB event happened:            : 1

Note that the R-APS messages have recorded the remote failure. Router 3 will see almost identical information.


Published: 2010-04-12

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