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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

8.20(3.7)S

Description (partial)

Symptom:
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.

Conditions:
(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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