Allied Telesis AlliedWare OS - Manual (Page 44)

Page 44 | AlliedWare™ OS How To Note: EPSR
Debugging
The transit node detects that port 1 has come back up. It sends a trap and changes the EPSR
state to Pre-forwarding. Note that it leaves port 1 blocked for vlan2, to make sure there are
no loops.
Now that the master node’s primary port is up again, it sends a Health message. Now that
the transit node’s port 1 is up again for the control VLAN, the transit node receives the
message. This demonstrates that the transit node has only blocked port 1 for the data VLAN,
not the control VLAN. EPSR control messages never loop because the master node never
forwards them between its ring ports.
Note that the hello sequence number increments from the number it was before the primary
port went down, because the master node could not transmit Health messages while the
port was down.
This is the packet shown in step 8 on page 39 of the master node debug output.
4. Port 1 comes back up
Manager 9924-B>
Block EPSR:test port:1 VLAN:2
EPSR test, Port 1 port up
EPSR INFO: Send trap EPSR:test oldState:LINK-DOWN newState:PRE-FORWARDING
nodeType:TRANSIT
EPSR test oldState:LINK-DOWN newState:PRE-FORWARDING
5. Transit node receives a Health message
Manager 9924-B>
EPSR Port1 Rx: 00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b
00bb0100 00541dee 00000000 0000cd28 0619990b 00400105 03e80000
00000000 cd280619 00010002 020000fa
EPSR Port1 Rx:
-----------------------------------------------------------------------
TYPE = HEALTH STATE = FAILED
CTRL VLAN = 1000 SYSTEM = 00-00-cd-28-06-19
HELLO TIME = 1 FAIL TIME = 2
HELLO SEQ = 250
-----------------------------------------------------------------------