Switch Impact for DAD State Changes

When an IP address is in a duplicate or tentative state, the normal behavior of the switch may change since that IP address isn‘t usable, even though it does exist. The following are some examples of what can happen when an IP address is marked duplicate or tentative:

Routes may be withdrawn or marked inactive
Dynamic IP ARP entries may get flushed
VRRP (Virtual Router Redundancy Protocol) virtual router (VR) instances may be disabled and put into init state causing the backup VRRP router to take over mastership.
Ping and traceroute commands may fail.
The DHCP (Dynamic Host Configuration Protocol) client will send a DHCP decline to the DHCP server if the IP address for a DHCP client on a VLAN (Virtual LAN) is not Valid
The DHCP scope IP address range configuration might fail when the DHCP enabled VLAN IP address becomes duplicate.
SNMP (Simple Network Management Protocol) requests may fail
SNMP traps will not be sent if the if the configured source IP address is not Valid

Published March 2020prev | next

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