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642-637 - Securing Networks with Cisco Routers and Switches (SECURE) v1.0
Cisco IOS Software displays the following message: DHCP_SNOOPING_5- DHCP_SNOOPING_MATCH_MAC_FAIL. What does this message indicate?
The message indicates that an attacker is pretending to be a DHCP server on an untrusted port.
The source MAC address in the Ethernet header does not match the address in the "chaddr" field of the DHCP request message.
The message indicates that the DHCP snooping has dropped a DHCP message that claimed an existing, legitimate host is present on an unexpected interface.
A Layer 2 port security MAC address violation has occurred on an interface that is set up for untrusted DHCP snooping.
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