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Cisco Bug: CSCtd34926 - CSS will ack a POST from client but never sends it to back end.

Last Modified

Feb 22, 2014

Products (1)

  • Cisco CSS 11000 Series Content Services Switches

Known Affected Releases


Description (partial)

CSS ack's POST data from client but never sends it to back end.
Basically black holes it.  Eventual reset from timeout seen from web server.

(only very specific scenario):
-client does ARP request during these posts.
-arp request disrupts post, such that the (normally preceding) header packet gets skipped and only the (normally second) request data packet goes out from client by itself onto the wire.
-moments later the client "recovers" from the missed packet by sending a single packet now containing both header & request data.
 The same post that got messed up now goes out in single packet. Let's call it the 'recovery' packet.
-the single request data packet must arrive at CSS AFTER the 'recovery' packet.
-This is the scenario in which the CSS will not forward the content to backend.
-L5 rule. Not using persistence rebalance.
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