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The SD-WAN UNI IPv4 IPv6 Connection Addressing Service Attribute specifies how IPv4 IPv6 addresses are allocated to the devices on the Subscriber side of the UNI. The Service Attribute has one of three possible values: connected to the UNI. It is one of the five values None, DHCP, or Static. In SLAAC, Static or LL-only, plus in the case of DHCP and Static there are , SLAAC or Static, some additional parameters. If the IPv4 IPv6 Connection Addressing is None, no IPv4 IPv6 addresses are used and IPv4 by the devices connected to the UNI and IPv6 is disabled on the link. Note that in this case IPv6 IPv4 connection addresses are needed .(see [R61]

The

).

If the value of the SD-WAN UNI

IPv4

IPv6 Connection Addressing Service Attribute

and the SD-WAN UNI IPv6 Connection Addressing Service Attribute (section 10.5) MUST NOT both have the value None

is one of DHCP, Static, SLAAC, LL_only, then IPv6 Link-Local addresses are present on the UNI. If the value is LL-only, then only IPv6 Link-Local addressing is used on the UNI.

If the value of the SD-WAN UNI IPv4 IPv6 Connection Addressing is DHCP, then DHCP DHCPv6 is used by devices in the Subscriber Network devices to request IPv4 IPv6 addresses in a given subnet from the Service Provider as described in RFC 2131 3315 [7] and RFC 2132 [8]12]. The Service Provider hosts the DHCP server and the Subscriber devices act as the DHCP clients.

[R62R66] When the IPv4 value of the SD-WAN UNI IPv6 Connection Addressing Service Attribute is DHCP, the Service Provider MUST use DHCP to convey to the Subscriber, in addition to the IPv4 IPv6 address, the subnet mask and the default router address.

If the value of the SD-WAN UNI IPv4 IPv6 Connection Addressing is Static, then IPv4 IPv6 addresses in a given IPv4 IPv6 subnet are statically assigned to the Service Provider and the Subscriber. In this context, Static refers to manual configuration of the IPv4 Connection Addressing on the Subscriber devices.For DHCP

If the value of the SD-WAN UNI IPv6 Connection Addressing is SLAAC, then Stateless Address Auto configuration (SLAAC) is used by the Subscriber devices to create unique IPv6 global addresses within an IP Prefix advertised by the Service Provider as described in RFC 4862 [14]. The Router Advertisements that convey the IP Prefix is also be used to convey the prefix length and router address.


For DHCP, SLAAC and Static, a number of further parameters have to be agreed including:

  • Primary SubnetSubnet List of one or more subnets, each comprising:
    • IPv4 IPv6 Prefix (IPv4
      • IPv6 address prefix and
      mask
      • prefix length between 0 and
      31, in bits)
    • Service Provider IPv4 Addresses (Non-empty list of IPv4 addresses)
    Secondary Subnet List; each entry containing:
    • IPv4 Prefix (IPv4 address prefix and mask length between 0 and 31, in bits)
    • Service Provider IPv4
      • 128 for DHCP and Static, or
      • IPv6 address prefix and prefix length of 64 for SLAAC
    • Service Provider IPv6 Addresses (Non-empty list of IPv4 IPv6 addresses)

The parameters consist of a primary subnet and zero list of one or more secondary subnets. In For each casesubnet, the IP Prefix is specified, along with the Service Provider’s IPv4 addresses. In the case of the primary subnet, this IP IPv6 prefix and the SP’s IPv6 address are specified. The IPv6 Prefix is referred to as the Connection Primary IPv4 Prefix, and for a secondary subnet, the Connection Secondary IPv4 Prefix.

For DHCP the address of the Subscriber’s default router is provided in the DHCP response. For Static addressing, the Service Provider’s addresses are assumed to be the default router addresses.

Note that the IPv4 IPv6 Prefix. Note that an IP Prefix and Service Provider addresses need to be agreed even when DHCP or SLAAC is used, so that the Subscriber Sub-scriber can ensure they do not conflict with any other addressing used within the Subscriber Network.

Any address within the IPv4 Connection Addressing subnet(s) can be used by the Subscriber for configuring Subscriber equipment, excluding the Service Provider IPv4 addresses and any addresses within prefixes listed in the value of the SWVC Reserved Prefixes Service Attribute (see A list (possibly empty) of reserved IP Prefixes can be specified (section 8.4); these specify IP addresses that are not available for the Subscriber to assign statically.
If DHCP is used, the IPv4 IPv6 address range, from which Subscriber addresses are dynamically assigned, is taken from the prefixes listed in the value of the SWVC Reserved Prefixes Service Attribute that are subnets of the Primary Subnet IPv4 Prefix or a Secondary subnet IPv4 prefix.

[R63] If the

any Connection IPv6 Prefix.

[R67] If the value of the SD-WAN UNI IPv6 Connection Addressing is Static, DHCP or SLAAC, for each entry in the Subnet List, the Service Provider IPv6 Addresses MUST be within the Connection IPv6 Prefix for that entry.

[R68] If the value of the SD-WAN UNI IPv4 IPv6 Connection Addressing is DHCP, addresses that are dynamically assigned by DHCP within the Connection Primary IPv4 Prefix or a Connection Secondary IPv4 Prefix MUST be taken from within an IP Prefix listed in one of the IP Prefixes in value of the SWVC Reserved Prefixes Service Attribute (section 8.4) that is a subnet of one of the Connection Primary IPv4 Prefix or Connection Secondary IPv4 Prefix.

For example, if the SWVC List of Reserved Prefixes includes:
• 192.168.1.0/26
• 192.168.2.0/26

and the Primary Subnet IPv4 Prefix is 192.168.1.0/24, DHCP can dynamically assign addresses 192.168.1.1 through 63 and the Subscriber can assign addresses 192.168.1.64 through 254 (note that [R65] prohibits the Subscriber from assigning the highest address in the prefix).

[R64] IPv6 Prefixes.

[R69] If the value of the SD-WAN UNI IPv4 IPv6 Connection Addressing is Static or DHCPSLAAC, for the Primary Subnet and for each Secondary Subnet, the Service Provider IPv4 Ad-dresses MUST be within the specified IPv4 Prefixthe IP Prefix advertised by the Service Provider as described in RFC 4862 [14] using Router Advertisements MUST be the Connection IPv6 Prefix for the first entry in the Subnet List.

The Subscriber can statically assign any IPv4 IPv6 address within the subnets identified by the Connection IPv4 PrefixesIPv6 Prefix in each entry, other than the Service Provider address itself, the lowest and highest possible addressesad-dresses, which are generally reserved, and any addresses address within IP Prefixes listed in the value of the SWVC Reserved Prefixes Service Attribute (see section 8.4).

[

R65

R70] If the value of the SD-WAN UNI

IPv4

IPv6 Connection Addressing is DHCP, SLAAC or Static, the Subscriber MUST NOT statically assign any of the following for use on the UNI by Subscriber devices

connected to the UNI

:

Any

IPv4

IPv6 address that is

neither

not within the Connection

Primary IPv4 Prefix nor within the Connection Secondary IPv4 Prefix

IPv6 Prefix for an entry in the

Secondary

Subnet List.
Any

of the Primary Subnet Service Provider IPv4 Addresses

IPv6 address within the Connection IPv6 Prefix for the first entry in the Subnet List, if the SD-WAN UNI IPv6 Connection Addressing is SLAAC.
Any of the Service Provider

IPv4

IPv6 Addresses specified in an entry in the

Secondary

Subnet List.
The lowest and highest

IPv4

IPv6 addresses in the Connection

Primary IPv4 Prefix, if the prefix length is less than or equal to 30.The lowest and highest IPv4 addresses in the Connection Secondary IPv4 Prefix

IPv6 Prefix for an entry in the

Secondary

Subnet List, if the prefix length is less than or equal to

30

126.
Any

IPv4

IPv6 address within IP Prefixes listed in the value of the SWVC Reserved Prefixes Service Attribute (see section 8.4).









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titleSource(s) and Reference(s)

MEF 70 - SD-WAN Service Attributes and Services Definition


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cqllabel = "mef-sdcp" and label = "sd-wan-uni-service-attributes"


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titleContributor(s)
Kirby Russell


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