ADC 3 Manual De Usuario

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When the DHCP relay agent sees this acknowledgement, it then checks 
to verify whether the IP address falls within a DHCP authority range 
configured on the interface, and one of the following actions occur:

If the address does fall within a preconfigured DHCP authority range and 
DHCP Authority is enabled for that interface, an ARP entry is added to the 
ARP cache for that interface and tagged as being assigned through DHCP. 
This tag is shown as type “Other” when viewing the ARP cache for that 
interface and ensures that specific IP address only maps to that specific 
MAC address. 

If there is no DHCP Authority range, the entry is simply added to the ARP 
cache and labelled as type “Dynamic” when the ARP mapping is learned. 

This feature is termed DHCP authority because those tagged as being 
assigned through DHCP take precedence over dynamically assigned 
(non-DHCP tagged) ARP entries. In the ARP cache entries that follow, those 
labelled as other are protected by DHCP authority, those labelled as dynamic 
are not:

cli:172.16.19.10:interface:cable:csi(1/1/1)# show arp

row count: 4

IP Address       MAC Address        Type

---------------- ------------------ ----------

192.168.19.51    00:10:95:04:0a:c4     dynamic

192.168.19.52    00:10:95:04:0a:b7     dynamic

192.168.19.55    00:10:95:01:ef:d8       other

192.168.19.56    00:a0:73:69:39:65       other

cli:172.16.19.10:interface:cable:csi(1/1/1)#