A system identifier is a manually configured IPv4 address that can be used to uniquely identify the 7705 SAR in the network in situations where the more commonly used system IP address may change dynamically, causing loss of historical data attributed to the node. For example, the system IP address can change dynamically using DHCP when the 7705 SAR is acting as a DHCP client and the DHCP server-facing interface is unnumbered. In this situation, a static system identifier may be desirable.
The system identifier can be any IPv4 address.