Location-Based IP Address Pools Overview
The LN1000 router is a full-featured Juniper Networks router running JUNOS Software with eight gigabit Ethernet interfaces that exists on a single module. It operates in a network device (such as a shelf) that contains multiple locations (slots). Each location supports eight gigabit Ethernet interfaces. These locations can be populated with multiple cards. Each card within this shelf is a separate entity (for example, a router or access device) in the internal network of the shelf.
The management system for the shelf downloads a separate configuration to each card when they are initialized. To enable this download, you must first configure an IP interface on each card with an IP address and subnet mask that are predefined for each location in the shelf.
You can use the JUNOS location-based IP address pools feature to configure the initial IP interface of the LN1000 router. The configuration is preserved when the shelf management system downloads a separate configuration to this interface, unless it is explicitly overwritten using existing CLI configuration commands (such as load override). If you move an LN1000 router to a different slot within the shelf, initialization restarts, in which case you might have to reconfigure the initial IP interface with the IP address and subnet mask specified for the new location. The shelf management system can then download a new configuration to the new interface.
A location pool can specify IP addresses and subnet masks for multiple locations (relative positions of cards within a shelf). You can configure an IP interface to obtain an IP address and subnet mask from a selected location pool instead of specifying an explicit IP address and subnet mask.
You can configure a maximum of 10 location-based IP address pools, each with a unique name. A pool can contain a maximum of 32 IP addresses. A pool entry contains a location index that has a unique value within its pool and an IP address and subnet mask that do not have to be unique. You can also define additional attributes for the pool entry as required.
In the existing IP interface configuration, you can specify a location-based IP address pool instead of an explicit IP address and subnet mask. You can configure an IP interface using one of these IP address specifications types, but not both. An IPv4 address can be configured for an IP interface as well as an IP pool.
