RTTO limit as reason of teardown in msg 6-302023: what does it mean?
The end of a "%ACE-6-302023 Teardown TCP connection ..." message is supposed to indicate the reason why the connection was torn down: TCP Fins, TCP Reset, Idle Timeout, etc. But i nour case some connections are logged with the following reason: "RTTO Limit". This reason is not documented in the "Message Guide" publication. Here's an example of a message (with masked IP adresses):
Re: RTTO limit as reason of teardown in msg 6-302023: what does
this is failure due to expiration of retransmission time an d retra
the count is detremined by syn-retry count set in connection parameter map default is 4 so
ace sends packet (1)
does not get ack in 3 seconds
ace retransmits (2)
no ack for 6 seconds
ace retransmits (3)
no ack in 12 seconds
ace retransmits (4)
no ack in 24 seconds
If the first 9-12 response packet from the ACE to the
client is dropped, then as expected after the RTO(after 3
seconds), ACE starts to retransmit the first packet to the client. If
the client won't ACK this packet also, then ACE retransmit this
packet at an exponentially interval(like 6, 12, 24 and 48 seconds)
for the "syn-retry" count times, and closes the connection by
sending a RST.
VMware Trunk Port Group is supported from ACI version 2.1
VMM integration must be configured properly
ASA device package must be uploaded to APIC
ASAv version must be compatible with ACI and device package version
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