I setup ip helper-address statements to forward DHCP requests to a central DHCP server which is working great however it is causing problems with Microsoft browser elections in the remote sites.
Is there some way to control what gets forwarded by the ip helper-address command so it only forwards DHCP and not any Microsoft related NetBT broadcasts? Thanks in advance for any help that can be provided.
Your command is not showing up because that port is enabled by default. And in IOS show run typically does not display default values.
And your issue is not so much that you need to forward DHCP as much as it is that you do not want to forward the Windows packets. I would suggest that you configure this:
no ip forward-protocol udp 137
no ip forward-protocol udp 138
Give that a try and let us know if it fixes your problem.
I guess the logic behind this command is that you have to disable the default udp ports which are enabled when configuring ip helper-address.
The default udp ports are listed in the link I provided, there aren't many.
I was able to duplicate what you are seeing in my lab.