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Cisco Bug: CSCul24665 - dhcp relay should not forward dhcp packets dropped by dhcp snooping

Last Modified

May 10, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

4.2.3.BASE

Description (partial) 

Symptom:
DHCP relay forwards DHCP packets which should have been dropped by DHCP snooping.

Conditions:
When DHCP snooping is configured in a bridge-domain and DHCP relay is configured on the BVI in that bridge-domain, snooping and relay will happen in parallel.

So even if snooping decides to drop a DHCP packet, then relay will still foward the DHCP packets to the DHCP server.
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