OPERATIONAL DEFECT DATABASE
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APs show low association time and are not able to remain connected. CPU process for wncd instances constantly show above 70% usage.
> 9800 controller running 17.3.4 > High client load on specific WNCD process > mDNS gateway service enabled. > High amount of mDNS queries for any specific service.
After debugging it is found if " match apple-continuity" is enabled is causing significant to WNCD processing at high load. So if you can remove (if enabled) it will help reduce the wncd cpu, thus avoiding ap drop outs. mdns-sd service-list policy-mdns-out OUT [no] match apple-continuity mdns-sd service-list policy-mdns-list IN [no] match apple-continuity • We also would like to configure transport to be ipv4 mdns-sd gateway transport both ipv4 (this will not impact ipv6 clients as learning will happen over ipv4 as well). • Set location to lss to reduce further mdns traffic mdns-sd service-policy mdns-WLC service-list policy-mdns-list IN service-list policy-mdns-out OUT location site-tag --> lss
To identify the number of mDNS queries processed by the controller run the following command: ------------------ show mdns-sd service statistics ------------------ Service Name Service Count ----------------------------------------------------------------------------- _atc._tcp.local 6 _hap._tcp.local 21 [...] _companion-link._tcp.local 1150 _cups._sub._ipp._tcp.local 63 Notice companion-link (configured as apple-continuity) has higher learnt services
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