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Configuring IP Routing
Configuring WAN interfaces
Type of service (TOS) support for selecting quality of service
Type of Service (TOS) support is an IP feature that enables the MAX unit to select a quality of
service for an application. Quality of service (QoS) is important in transmission of high
bandwidth audio and video data. TOS, specified by abstract values of precedence, delay,
throughput, reliability, and cost, is configured through setting of priority bits and
Type-of-Service (TOS) classes (as defined in RFC 1349: Type of Service in the Internet
Protocol Suite) on behalf of customer applications. The MAX unit establishes information for
use by upstream routers to prioritize and select links for particular data streams. It does not
implement priority queuing.
You can enable TOS by setting parameters that define a policy in a Connection profile or
RADIUS profile. The parameters in the profile set bits in the TOS byte of each IP packet
header that is received, transmitted, or both, on the WAN interface. You can then configure
other routers to interpret the bits accordingly.
You can also specify TOS policy in a TOS filter, which you apply to any number of
Connection or RADIUS profiles. Like other kinds of Lucent packet filters, a TOS filter can
affect incoming packets, outgoing packets, or both, depending on how you define the filter.
For a Connection profile or RADIUS profile that has both its own local policy and an applied
TOS filter, the policy defined in the TOS filter takes precedence. For example, applying a TOS
filter to a TOS-enabled connection allows you to specify one priority setting for incoming
packets on a connection and to define another policy for incoming packets addressed to a
particular destination specified in a TOS filter.
Defining TOS policy within a profile
To provide service-based TOS or to set precedence for the traffic on a particular WAN
connection, you can define the policy directly in a Connection profile or RADIUS profile.
Settings in a Connection profile
Following are the relevant Connection profile parameters, located in Ethernet > Connections >
any Connection profile > IP Options:
Parameter
TOS Enabled
9-46
Ascend-PPP-Addr = 10.5.6.7,
Ascend-IF-Netmask = 255.255.255.0
Specifies
Enables/disables Type of Service (TOS) for this connection. If you set
TOS Enabled to No, none of the other TOS options apply.
MAX 6000/3000 Network Configuration Guide
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