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New Member

nexus 5K DHCP issue

I'm experiencing issue with DHCP on Nexus 5K. I have ip dhcp relay address defined on the SVI (Vlan 10). In addition to that I have few another DHCP servers on the same broadcast domain.

 

interface Vlan 10
  no shutdown
  vrf member CUSTA
  ip address 172.106.133.1/21
  ip dhcp relay address 172.106.145.100
  ip dhcp relay address 172.106.145.101

 

other DHCP servers 

DHCP server 172.106.128.62
DHCP server 172.106.128.63

 

Issue: when the ip dhcp relay address is specified in the SVI. other DHCP servers in the same broadcast domain is not getting the DHCP request.

 

2 REPLIES
VIP Super Bronze

Does this happen when you add

Does this happen when you add the VRF to the SVI?

To test, you can remove the "vrf member CUSTA" from the SVI and test with global routing table.

HTH

New Member

Hi, I think you encounter a

Hi,

 

I think you encounter a well known problem : On Nexus family, when activating ip dhcp relay feature, dhcp broadcast are no more forwarded to the local broadcast domain (vlan) due to an internal access-list that redirects packets to CPU :

https://supportforums.cisco.com/document/56651/differences-between-dhcp-relay-nexus7000nxos-and-ip-helper-6500ios

As a workaround, you have to add a relay address to you local DHCP servers...

 

 

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