Allied Telesis AT 9924SP AT-9924SP-30 AT-9924SP-30 Software Manual page 45

Configure epsr (ethernet protection switching ring) to protect a ring from loops

6. Transit node receives a Ring-Up-Flush-FDB message.

The Health message from the previous step reaches the master node and shows it that all

links in the ring are now up. The master node sends a Ring-Up-Flush-FDB message. When it

receives the message, the transit node unblocks port 1 for vlan2, flushes its FDB, sends a

trap, and changes the state to Link-Up.

This is the packet shown in step

EPSR Port1 Rx:

-----------------------------------------------------------------------

Unblock EPSR:test port:1 VLAN:2

Flush FDB EPSR: test

EPSR INFO: Send trap EPSR:test oldState:PRE-FORWARDING newState:LINK-UP

EPSR test oldState:PRE-FORWARDING newState:LINK-UP

Page 45 | AlliedWare™ OS How To Note: EPSR

00e02b00 00040000 cd280619 8100e3e8 005caaaa 0300e02b

00bb0100 00541fea 00000000 0000cd28 0619990b 00400106 03e80000

00000000 cd280619 00000000 01000000

TYPE = RING-UP-FLUSH-FDB

CTRL VLAN = 1000

HELLO TIME = 0

HELLO SEQ = 0

vid: 2

nodeType:TRANSIT

10 on page 40

of the master node debug output.

STATE = COMPLETE

SYSTEM = 00-00-cd-28-06-19

FAIL TIME = 0

Debugging