Overview; Network Qos Policy In Network Mode - Alcatel-Lucent 7210 SAS M OS Quality Of Service Manual

Overview

Overview

Network QoS Policy in Network Mode

The network QoS policy consists of an ingress and egress component. When 7210 SAS-M is
operating in network mode, there are two types of network QoS policies, network QoS policy of
type port and network QoS policy of type ip-interface. A port network policy is applied to
network ports, used for classification/remarking of IP traffic using DSCP or Dot1p values. Either
DSCP or Dot1p can be used for ingress classification but not both. Both DSCP and Dot1p can be
configured at egress for remarking. The ip-interface type network policy is applied to IP
Interface, used for classification/remarking of MPLS traffic using EXP values. Note that the FC to
Dot1p marking values configured on the port, is also used to mark the Dot1p in the VLAN tag, if
any, used for MPLS traffic.
The ingress component of the policy defines how EXP, DSCP or Dot1p bits are mapped to internal
forwarding class and profile state. The forwarding class and profile state define the Per Hop
Behavior (PHB) or the QoS treatment through the 7210 SAS . From release 4.0, the profile
mapping is defined using a new policy mpls-lsp-exp-profile-map. The mpls-lsp-exp-profile-map
defines the mapping between the LSP EXP bits and the profile (in or out) to be associated with a
packet. The mapping on each ip-interface or port defaults to the mappings defined in the default
network QoS policy until an explicit policy is defined for the IP interface or port.It also defines the
rate-limiting parameters for the traffic mapped to each forwarding classes. Traffic mapped to each
forwarding class can be rate limited using separate meters for each unicast and multipoint traffic
(multipoint is used only for IP Interface for MPLS traffic).
The total number of QoS resources, that is ingress classification entries and policers, available for
use with IP interfaces is limited. The software allocates these resources to an IP interface on a first
come first serve basis. The number of resources used per IP interface limits the total number of IP
interfaces configured on the system (the total number of IP interfaces allowed is also subject to a
system limit).
The egress component of the network QoS policy defines the LSP EXP, DSCP or Dot1p bits
marking values associated with each forwarding class.
By default, network qos policy remarking is always disabled. If the egressing packet originated on
an ingress SAP, the egress EXP bit marking based on the forwarding class and the profile state.
The default map of FC-EXP marking is as shown in default network qos policy, policy id 2. All
non-default network qos policies inherits the FC-EXP map.
By default, all ports configured in network mode use Default network policy "1" and all network
port IP interfaces use Default network policy "2". Default network policies "1" and "2" cannot be
modified or deleted.
Network policy-id 2 exists as the default policy that is applied to all IP interface by default. The
network policy-id 2 cannot be modified or deleted. It defines the default LSP EXP-to-FC mapping
Page 108 7210 SAS M OS Quality of Service Guide