Cisco Bug: CSCtf22395 - Poor RTT from TM's filtering servers using IOS Content filtering
Mar 01, 2018
- Cisco IOS
Known Affected Releases
Symptom: Poor http performance through a router configured with IOS content filtering Conditions: IOS router configured for content filtering that is experiencing poor performance/and unexpected blocked pages. This issue may come and go throughout a day. You will see evidence of the poor RTTs (Round Trip Times) in the output of "show policy-map type inspect zone-pair urlfilter | b Trend" Trend URL Filtering is ENABLED Trend server : trps.trendmicro.com(port: 80) Current requests count: 0 Current packet buffer count(in use): 0 Maxever request count: 29 Maxever packet buffer count: 114 Total cache hit count: 1341 Total requests sent to URL Filter Server :675 Total responses received from URL Filter Server :675 Total error responses received from URL Filter Server :0 Total requests allowed: 674 Total requests blocked: 1 1min/5min Avg Round trip time to URLF Server: 839/839 millisecs 1min/5min Minimum round trip time to URLF server: 200/200 millisecs 1min/5min Maximum round trip time to URLF server: 2892/2892 A reasonable average 1min/5min round trip time should be somewhere ~250ms depending on geographic location. Furthermore, a regular ICMP ping to these IP addresses, will respond with times under ~100ms (depending on geographic location), while the application RTTs (as seen in the output above) will be much higher and inconsistent.
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