I’ve got a 4500/Sup7L-E running 3.3.2SG (15.1(1)SG2) with an SVI configured to 
use a DHCP relay (ip helper-address).

I tried to change the helper address, but after making the change, the box was 
still routing broadcasts to the old helper.

I’ve seen this once before and did a bunch of troubleshooting, but couldn’t 
find a workaround short of rebooting the box.  I went so far as to try and 
delete and recreate the SVI with the interesting helper config on it, but even 
still, it sends to the original helper address.

Has anyone seen anything like this in the wild before?  I know this is running 
really old code and I have a plan in the works to upgrade all the boxes running 
this version to 3.6E where this and a bunch of other bugs are fixed, but I’m 
hoping that I can effect some sort of a workaround for this particular issue 
until then.

Thanks in advance.
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