IPoE and PPPoE are commonly used in residential networks and have expanded into business applications.
Both IPoE and PPPoE subscriber hosts terminate in a retail VPRN. It is possible for the subscriber to connect to one or more 7750 SRs for dual homing purposes. When the subscriber is dual-homed, routing between the two BNGs is required and can be performed with either a direct spoke SDP between the two nodes or by MP-BGP route learning.
For PPPoE, both PADI and PAP/CHAP authentication are supported. The PPPoE session is negotiated with the parameters defined by the retail VPRN interface. Because the IP address space of the sub-mgmt host may overlap between VPRN services, the node must anti-spoof the packets at access ingress with the session ID.
When the config>service>vprn>sub-if>private-retail-subnets command is enabled on the subscriber interface, the retail IP subnets are not pushed into the wholesale context. This allows IP addresses to overlap between different retail VPRNs (those VPRNs can have IPoE or PPPoE sessions). If an operator requires both residential and business services, two VPRNs connected to the same wholesaler can be created and use the flag in only one of them.
To update a subscriber attribute (such as an SLA-profile or subscriber-profile), either perform a RADIUS CoA or enter the tools>perform>subscriber-mgmt>coa command. To identify a subscriber for a CoA, the subscriber IP address can be used as part of the subscriber's key. Because it is possible for different subscribers to use the same IP address in multiple private retail VPRNs, additional parameters are required in addition to the subscriber IP address. When performing a CoA on a retail subscriber for PPPoE hosts using a private retail subnet, the following conditions apply:
If NAS-port-ID is used, the VSA Alc-Retail-Serv-Id or Alc-Retail-Serv-Name must be included. The subscriber IP address and prefix must also be included.
If Alc-serv-ID or Alc-Serv-Name is used, the subscriber retail service ID or name must be referenced. The subscriber IP address and prefix must also be included.
When performing a CoA on a retail subscriber for IPoE hosts using a private retail subnet, the following conditions apply:
If NAS-port-ID is used, the VSA Alc-Client-Hardware-Addr referencing the subscriber MAC and Alc-Retail-Serv-Name must be included. The VSA Alc-Retail-Serv-Id must not be included. The subscriber IP address and prefix must also be included.
If Alc-serv-ID or Alc-Serv-Name is used, it must reference the subscriber wholesale service ID or name. The VSA Alc-Client-Hardware-Address and the subscriber IP address and prefix must also be included.
To perform a DHCP force renew on IPoE hosts, enter the tools>perform>subscriber-mgmt>forcerenew command. To identify between subscribers within a private retail VPRN where overlapping IP addresses are possible, the MAC address must be used instead of the IP address in the tools command.
Private retail subnet are supported on both numbered and unnumbered subscriber interfaces. RADIUS host creation is possible for IPoEv4 hosts.
When IPoE and PPPoE session terminates in the retail VPRN, the node must learn the retail VPRN service ID. This can be provided by the LUDB or RADIUS. If the local user database is used, the host configuration provides a reference to the VPRN service ID. If RADIUS is used, RADIUS can return the service ID or name VSA. The retail subscriber interface must also reference the subscriber interface on the wholesale subscriber interfaces.
The following are not supported on private retail subnets:
ARP hosts
static hosts
MCS redundancy
ESM multicast is not supported for IPoE hosts that use overlapping IP address between private retail VPRNs. ESM multicast is only supported for IPoE hosts that have unique IP addresses in the system. It is possible for a IPoE subscriber to contain both type of hosts, only the hosts with overlapping private IP address do not support ESM multicast.