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Page 54 | AlliedWare™ OS How To Note: EPSR
Debugging
In the meanwhile, the master node has received a Link-Down message from the switch at the
other end of the broken link (in step 3 on page 48). Therefore, the master node realises that
the ring is broken and acts accordingly. As part of the recovery process, the master node
sends a Ring-Down-Flush-FDB message. The transit node receives this message and flushes
its forwarding database.
This is the packet shown in step 4 on page 49 of the master node debug output.
The transit node realises that its port is down, sends a Link-Down message, sends a trap, and
changes its state to Link-Down. The transit node sends this message some time after the link
actually went down, because the ring ports are
1
000M ports (see "Ports and Recovery
Times" on page 30). Note that by this stage the ring has already changed topology to restore
traffic flow. The master node detected the link failure by receiving a Link-Down message
from the other side of the link.
This is the Link-Down message that the master switch received in step 5 on page 49.
3. The transit node receives a Ring-Down-Flush-FDB message
EPSR Port1 Rx: 00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b
00bb0100 00541ee9 00000000 0000cd28 0619990b 00400107 03e80000 00000000
cd280619 00000000 02000000
EPSR Port1 Rx:
-----------------------------------------------------------------------
TYPE = RING-DOWN-FLUSH-FDB STATE = FAILED
CTRL VLAN = 1000 SYSTEM = 00-00-cd-28-06-19
HELLO TIME = 0 FAIL TIME = 0
HELLO SEQ = 0
-----------------------------------------------------------------------
Flush FDB EPSR: test vid: 2
4. The transit node sends a Link-Down message
Manager 9924-B>
EPSR test, Port 2 port down
Flush FDB EPSR: test vid: 2
Block EPSR:test port:2 VLAN:2
EPSR Port1 Tx: 00e02b00 00040000 cd24024f 8100e3e8 005caaaa 0300e02b
00bb0100 00542484 00000000 0000cd24 024f990b 00400108 03e80000 00000000
cd24024f 00000000 04000000
EPSR Port1 Tx:
-----------------------------------------------------------------------
TYPE = LINK-DOWN STATE = LINK-DOWN
CTRL VLAN = 1000 SYSTEM = 00-00-cd-24-02-4f
HELLO TIME = 0 FAIL TIME = 0
HELLO SEQ = 0
-----------------------------------------------------------------------
EPSR INFO: Send trap EPSR:test oldState:LINK-UP newState:LINK-DOWN
nodeType:TRANSIT
EPSR test oldState:LINK-UP newState:LINK-DOWN