User guide

Provisioning Strategy Deployment Models (Access Islands, Open Access, multi-
AlliedView NMS Administration Guide (Provisioning the iMG/RG)
7-6
For each service provider’s wiring center exchange, there can be a Provider Edge-Access Network (PE-AN), and these can be
divided into Multi-service Access Island Networks. These Access Islands are basically one leaf of the larger network, and can
be the initial configuration when a small number of RGs are initially deployed. With growth, a PE-AN could service, for exam-
ple, 15,000 customers, which each island supporting 1000.
Note: So with this configuration, there can be up to 15 Access Island networks. This concept is used during
provisioning.
Usually, one or two GbE or 10GbE Level-3 routers (PE-R) can be used to service the entire PE-AN; with this design the num-
ber of anticipated advanced subscriber services will determine the size and capabilities of the required provider edge router.
Note: Each Access Island uses a set of VLAN numbers unique to that Access Island; the next Access Island uses
VLAN numbers that are usually the next number up. For example, Access Island one (AI01) could use a set
of VLANs (201, 301, 401, 501, and 601) for DHCP discovery and the subscriber services. The next Access
Island would use 202, 302, etc. The exception would be when the PE Router (L3) supports a Virtual
Routing Function (VRF) and therefore sufficient multicast routing capabilities. Then each Access Island
could have the same VLAN configuration (mirror configuration). The one-hundred level VLANs (200, 300 etc.)
could be for testing with the prefix TEST.
Note: When provisioning with Profiles for each Access Island, the only Profiles that are unique to each Access
Island are the General Profiles, since the General Profile contains the VLAN and L3 static route
information. The other Profiles (for service types) are usually the same for RGs in any Access Island since
the service offered would have the same attributes.
7.2.2.2 Multiple ISPs (Open Access)
In networks where there are multiple service providers for various services, each VLAN may be used for a service type and
ISP. The result is a set of VLANs for each service type, as shown in the following figure.
Refer to 7.9 for details on the multiple ISP configuration.
Note: The default is the Access Island model.