07-20-2014 10:30 PM - edited 03-07-2019 08:08 PM
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.
07-21-2014 07:41 AM
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
07-21-2014 08:04 AM
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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