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Cisco Bug: CSCuo88513 - N7k : ipv4 DHCP relay source-interface support

Last Modified

Apr 24, 2018

Products (7)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

5.2(9) 6.1(3) 6.2(2)

Description (partial)

When using the DHCP relay feature, the relay agent sources the packets from the physical egress interface. 

In certain specific scenarios it may be convenient to source the packets from a specific virtual address

(use case: 

DHCP server is located off-site, and there are ECMP routes back to the DHCP relay agents (N7ks). 
in this scenario, using specific feature combination (FHRP, uRFP strict), DHCP offers that arrive onto a peer relay agent, have to cross the MCT and are dropped due to uRFP check). 

This happens because the traffic is sourced from physical interface IP, and not FHRP VIP. )
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