i understand the meaning of the message timer, but what ist the use of the time out interval? On the cisco webpage i found: "When UDLD neighbors are established, the configured message interval is sent and the timeout interval for that peer is calculated to be (3 * message_interval)."
But on my switch the output shows 2 kind of timers:
Interface Gi1/1 --- Port enable administrative configuration setting: Enabled / in aggressive mode Port enable operational state: Enabled / in aggressive mode Current bidirectional state: Bidirectional Current operational state: Advertisement - Single neighbor detected Message interval: 15 Time out interval: 5
so if i plan to use udld in a rstp environment, in a case of an unidirctional link i have to consider a maxage of 4-6 secplus listening and learning state 15 sec each (because there is no rstp communication and the system will fall back to 802.1D). That result in a total time from blocking to forwarding of approximately 34-36 sec. right?
UDLD have to recognize the link failure before a time of max. 36 sec, so if i use aggressive mode the following happens:
the timout of 5 sec expires
than 3 times of the transmit intervall expires
after that 8 additional packets are send in aggressive mode, one packet every second
So, 5 + 45 (3*15) + 8 = 58 sec , so i have to modify the transmit interval to 7 sec:
Than 5 + 21 (3*7) + 8 = 34 sec, and that is a value below the 36 sec for rstp.
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