The address would still be part of an overall subnet regardless if it's per interface or per device. For example, if you had a device that had three nics, you may need a different address on each nic, but if you have a printer, it only uses a single address for the whole node.
To add my two cents, in IP, there is no such thing as "IP address per device". In the IP addressing paradigm, addresses are always assigned to interfaces, never to entire devices. If the device has just one network interface, the address will be assigned to that interface, sometimes giving the impression that it is the device's address. In reality, though, IP addresses are always a property of network interfaces, and are therefore directly related to the network into which respective network interfaces connect to.
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
As Peter has noted, you normally assign IPs to interfaces, although something like a routing protocol's explicit router-ID might be considered an "IP address" assigned to the device and not an interface.
As to assigning a subnet mask, it really depends on whether the IP address is routable, and whether it will create a conflict with other interface IPs on the device as Cisco devices often "complain" (or not accept) if they see multiple interfaces within the same subnet.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...