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Creating an IP Address Pool


You, the Service Designer, can create consistent IP address pools for Layer 3 VPNs by selecting Prestage Devices > Resources > Add IP Address Pools from the Network Services > Connectivity task pane in Build mode of Service View. The IP addresses assigned to each PE/CE link need to allow routing across the customer’s entire Layer 3 VPN, as long as the PE/CE addresses are not exposed outside of that VPN. If the PE/CE link addresses are accessible from outside the customer’s VPN, then those IP addresses may also need to be globally unique across the internet, instead of just within the customer’s VPN.

When you create an IP address pool, it appears in the Prestage Devices > Resources inventory page. See Creating an IP Address Pool


Preferably, create all IPv4 address pools at the beginning of the prestaging process (see Prestaging Devices Overview), before you run Role Discovery (see Discovering and Assigning All N-PE Devices), so that any IPv4 IP addresses found on devices during the role discovery process can be marked as already allocated in the corresponding IPv4 IP address pools.

To create an IPv4 IP address pool:

  1. In the Network Services > Connectivity task pane, select Prestage Devices > Manage Resources. The Resource Utilization Status page is displayed. The status of various resources such as VLAN, virtual circuit, route target, route distinguisher, and IP address pool are displayed in a tabular format. You can create a customized IP pool based on your network deployment needs.
  2. Under the Allocated column, click the link in the displayed number to open the Resource Allocated Details dialog box. If the resource pool is an IP address pool, the IP addresses allocated from the selected resource pool are displayed in a table. Similarly, for other resources such as VLAN or virtual circuit, information regarding the element or device to which the resource is allocated is displayed.
  3. Click Add at the top of the table of displayed resources. The Add IP Address Pool dialog box appears.
  4. In the Pool Type drop-down list box, select the IP pool type as either Global or Customer.
    • A Global IP address pool pertains to the service provider. There can be more than one global IPv4 address pool. However, each global pool must have its own unique name and its set of IPv4 addresses must not overlap with those of any other global pool. You can allocate addresses from global pools across multiple Layer 3 VPNs across multiple customers.

    • A Customer IP address pool pertains to an existing customer. These pools are associated with the corresponding customer. You can associate more than one customer IPv4 pool with each customer. However, each customer pool must have its own set of IPv4 addresses which must not overlap with those of any other pool belonging to the same customer. You can allocate addresses from customer pools across multiple Layer 3 VPNs for a particular customer.

  5. In the Pool Name field, enter a unique name.

    An IP address pool name can be no more than 50 characters.

  6. In the IP Address Pool field, enter an IPv4 IP address pool.

    Any IPv4 address pool in Junos Space maps directly onto the Classless Interdomain Routing (CIDR) notation for IPv4 network addresses. The CIDR network address, is a contiguous block of 256 individual IPv4 addresses: through, inclusive. The network address is a contiguous block of 4 individual IPv4 addresses: through, inclusive. As a consequence, any Junos Space IPv4 address pool directly maps to (and is identified by) its CIDR network address. The Junos Space IPv4 address pool,, contains all of the addresses from to, while the IPv4 address pool, contains all of the addresses from to

  7. In the Subnet (/) field, enter the destination IP prefix length or the subnet mask. The subnet mask indicates the number of bits used for the network portion of the address (for example,
  8. If you are creating a Customer IP address pool, the Associate with customer drop-down list box appears. Select an existing customer name. To create a customer, see Adding a New Customer.
  9. Click Create.

    Junos Space saves the IP address pool information in the database. The IP address pool appears in the Resources inventory page. The Pool Type column differentiates global from customer IP address pools.


    You need to create IP address pools only if the operation of your network requires it. Alternatively, you can use the global IP pools provided by the Connectivity Services Director application for IP services.


    When you delete an IP address pool, you must ensure that such a pool is not being currently utilized or allocated to a managed element. Otherwise, you cannot delete such an allocated IP address pool.