Cisco Bug: CSCtd34926 - CSS will ack a POST from client but never sends it to back end.
Feb 22, 2014
- Cisco CSS 11000 Series Content Services Switches
Known Affected Releases
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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