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Cisco Bug: CSCuo55022 - 3850 hosts not getting DHCP addresses when Port-security is enabled

Last Modified

Oct 14, 2019

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases


Description (partial)

When connecting a host into an access-port with Port-security enabled and using VLAN 325, the switch is not learning the MAC address of the end device and no DHCP address is leased to this host.

The following errors can be seen during the issue:
Mar 26 18:55:22.255: PSECURE: swidb = GigabitEthernet1/0/16 mac_addr = 5cf6.dc1b.ce17 vlanid = 325
Mar 26 18:55:22.255: PSECURE: Adding address vlan 325 5cf6.dc1b.ce17 to port-security
Mar 26 18:55:22.255: PSECURE: Adding addresses to port-security sub block
Mar 26 18:55:22.255: PSECURE: Internal error in adding address

Use of VLAN 325 plus Port-security on access ports. 
Example of port configuration:
interface GigabitEthernet1/0/16
switchport access vlan 325
switchport mode access
switchport port-security
switchport port-security aging time 2
switchport port-security violation restrict
switchport port-security aging type inactivity
spanning-tree portfast
spanning-tree bpduguard enable
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