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2x WLC's 8540 v. 8.8.100.0 in SSO mode. Issue with Mbuf allocation on primary/active WLC caused multiple services failure - client authentication, AAA communication, CAPWAP exchange , monitoring problems (SNMP exchange).
Logs seen: %SYSTEM-3-MBUF_ALLOC_FAIL: [PA]sysapi_if_net.c:716 Cannot allocate new Mbuf.Internal system error. %SYSTEM-3-MBUF_MAX_HIT: [PA]sysapi_if_net.c:162 Mbuf Max reached:[proto:count],[2:65535],[18:104],[4:1],[6:1],[7:1],[10:1],[12:1],[13:1],[17:1],[21:1]
Reboot / switchover.
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