User's Manual

CHAPTER 2. Overview of SPI-2213

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2.3.3 IP Processing Functions

IP QoS Function

Since the SPI-2213 supports Differentiated Services (DiffServ), it can provide the backhaul

QoS in the communication with ACR.

It supports 8-class DiffServ and supports the mapping between the DiffServ service class

and the service class of the user traffic received from an MS. In addition, the SPI-2213

supports the mapping between Differentiated Services Code Point (DSCP) and 802.3

Ethernet MAC service class.

Simultaneous Support of IPv4/IPv6

ACR communicates with the SPI-2213 through the GRE tunnel and the backhaul IP

version between the SPI-2213 and ACR is managed independently from the service IP

version for the MS.

Even if, therefore, IPv4 is used in backhaul between the SPI-2213 and ACR, all of IPv4,

IPv6 and IPv4/IPv6 dual stack services can be supported for the MS.

Figure 2.1 IPv4/IPv6 Dual Stack Operation

IP Routing Function

Since the SPI-2213 provides several Ethernet interfaces, it stores the routing table with the

information on the Ethernet interface to route IP packets. The routing table of the SPI-2213

is configured depending on operator’s setting and the configuration and the setting of the

routing table are similar to the standard setting of the router.

The SPI-2213 supports the static routing configuration only and not the router function for

the traffic received from the outside. When the SPI-2213 connects an auxiliary device, it

supports the IP packet routing function for the auxiliary device by using Network Address

Translation (NAT).

IPv4

IPv6

Dual Stack MS

(IPv4/IPv6)

RAS

ACR

IPv6 Network

IPv4 Network

Access Network

Dual Stack Processing

Gateway

Core Network