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Cisco Bug: CSCvw03185 - Unable to completely filter out ssdp traffic which lead to High CPU utilization

Last Modified

Oct 23, 2020

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases


Description (partial)

A high CPU issue occurred, and a large amount of SSDP traffic is found through CPU capture.
After applying below input ACL (filter UDP port1900 of block SSDP), the high CPU incident has been resolved, 
but there is still 4% SSDP traffic which has not been filtered out fully.
ip access-list extended Vlan X
 deny   udp any any eq 1900
 permit ip any any

interface Vlan X
 ip access-group Vlan X in

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