Allied Telesis x900-48FE-N User Manual

Page 36 | AlliedWare™ OS How To Note: EPSR

This section walks you through the EPSR debugging output as links go down and come back 
up again. The debugging output comes from the ring in 

The output shows what happened when we took down two separate links in turn:

•

first, 

•

second, 

To enable debugging on the domain called “test”, use the command:

enable epsr=test debug=all

Note that the master node transmits Health messages every second by default. The 
debugging displays every message, including all Health messages. Therefore, we recommend 
that you capture the debugging output for separate analysis, to make analysis simpler.

This section shows the debugging output when the link between the master node’s primary 
port and transit node B goes down and comes back up again. It shows the debugging output 
for the complete failure and recovery cycle:

•

first 

•

then 

The following debugging output starts with the ring established and in a state of Complete.

 

Each time the Hello timer expires, the master node sends a Health message out its primary 
port (port 1). As long as the ring is in a state of Complete, it receives each Health message 
again on its secondary port (port 2). Note that in the System field, this output shows the 
MAC address of the source of the message—the master node in this case.

1. The master node sends Health messages

Manager x900-48-A> 

epsrHelloTimeout: EPSR test Hello Timer expired
EPSR Port1 Tx:  00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b 

00bb0100 00541f2a 00000000 0000cd28 0619990b 00400105 03e80000 
00000000 cd280619 00010002 010000be

 EPSR Port1 Tx:
 -----------------------------------------------------------------------
          TYPE = HEALTH                    STATE = COMPLETE            
     CTRL VLAN = 1000                     SYSTEM = 00-00-cd-28-06-19
    HELLO TIME = 1                     FAIL TIME = 2    
     HELLO SEQ = 190  
 -----------------------------------------------------------------------
EPSR Port2 Rx:  00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b 

00bb0100 00541f2a 00000000 0000cd28 0619990b 00400105 03e80000 
00000000 cd280619 00010002 010000be

 EPSR Port2 Rx:
 -----------------------------------------------------------------------
          TYPE = HEALTH                    STATE = COMPLETE            
     CTRL VLAN = 1000                     SYSTEM = 00-00-cd-28-06-19
    HELLO TIME = 1                     FAIL TIME = 2    
     HELLO SEQ = 190  
 -----------------------------------------------------------------------