Troubleshooting DHCP issues

[q-le]

Hi All,

We have 2 x Nexus 7 cores and several access switches 3750 + 2960 and several VLANs.

All working well until recently we have a couple of users in VLAN say 200 reported they can not get an IP address from our Windows DHCP server.

ie hence they can not log to the Domain and we temporarly assign them a static IP addresses  until we figure out what went wrong!!!

We checked the trunk , the DHCP server but can not see anything wrong

How do we troubleshooting this issues ? 

Any advices are much appreciated

Thanks

Peter

[q-le]

Disable HSRP on Core from VLAN200 and now I can get DHCP !!! 

But still confuse what cause the issues and how to fix it properly ?

Please advise

Thanks

[Parvesh Paliwal]

Dear Q-Le,

It seems clear that a certain vlan is unable to perform on Vlan 200 and it could be caused by trunk failures/drops between HSRP participants.

Can you check interface utilization and drops on certain trunks?

-

Parvesh

Remember marking as correct answer / helpful answer.

[q-le]

We remove HSRP on core2 , and enable it again and it seems to fix the DHCP issues.

Do not know how this process work but i am happy it fix the problems

All good.

Thank you all for your help