[c-nsp] Cisco 7201 sending unintended gratitious arps

[Mike]

Hi,

     I have a 7201 which is terminating pppoe sessions, amoung other 
jobs. For some reason, on an interface completely unrelated (gi0/0.4), 
the router appears to be sending gratuitous arps every time it sets up a 
new session, like so:

  xx:xx:xx:xx:xx:xx > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 
60: Ethernet (len 6), IPv4 (len 4), Reply y.y.y.y is-at 
xx:xx:xx:xx:xx:xx, length 46

     I believe these are showing up on other interfaces as well. I don't 
understand why it would be sending these, and especially, why would it 
be sending them out interfaces not related or having subnet addresses 
anywhere near the same range? The above example interface gi0/0.4 is in 
10.0.1.32/27 while the arp above would be for my public ip block in the 
216.x.x.x range.

     The router runs 12.2(33)-SRE7 if it makes a difference. Anyone know 
how I can turn it off?

Mike-