Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 131)

Brocade Virtual ADX Server Load Balancing Guide 115
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Miscellaneous options
2
Disabling TCP RST message when a real server goes down
during an open session
By default, if a real server goes down during an open TCP session with a client, the Brocade Virtual
ADX sends a TCP RST message to the client to terminate the session normally. When the real server
comes back up, clients can establish a new session with the server.
You can globally disable the TCP RST message from being sent under these circumstances. When
you disable the TCP RST message, the client can resume the interrupted session when the real
server comes back up.
NOTE
Disabling the TCP RST messages affects only the message sent to a client when a real server goes
down during a client’s session with the server. TCP RST messages sent under other circumstances
are not affected.
To globally disable the TCP RST message from being sent, enter the following command.
Virtual ADX(config)#server no-reset-for-established-session
Syntax: [no] server no-reset-for-established-session
By default, sending TCP RST messages is enabled.
No TCP RST response to non-SYN first packet of a TCP flow
The Brocade Virtual ADX can remain passive for non-SYN packet in the beginning of the flow. The
default behavior is to send a TCP RST packet to client when a non-SYN packet is received at the
beginning.
By default, the Brocade Virtual ADX responds with a TCP RST packet whenever it receives a
non-SYN TCP packet from a client destined for a VIP if there is no matching session.
If you want the Brocade Virtual ADX to remain passive, use the following command to ensure that
no RST packet is sent to the client.
Virtual ADX(config)#server reset-on-syn-only
Syntax: [no] server reset-on-syn-only
Decrement counters in deletion queue
On a Brocade Virtual ADX, when a connection is closed, the corresponding sessions are not
immediately deleted. The sessions are put in a deletion queue and deleted later at MSL time
(default is 8 seconds). Statistics on the closed connections are not adjusted until the sessions are
actually deleted from the deletion queue.
To adjust statistics when sessions are put in the deletion queue, use the following command.
Virtual ADX(config)#server decrement-counter-when-put-in-delQ
Syntax: [no] server decrement-counter-when-put-in-delQ