The network QoS policy consists of an ingress and egress component. For the 7210 SAS-T, 7210 SAS-Sx/S 1/10GE, 7210 SAS-Sx 10/100GE, 7210 SAS-Mxp, 7210 SAS-R6, and 7210 SAS-R12 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 type network policy is applied to network and hybrid ports and is used for classification and 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.
An ip-interface type network policy is applied to an IP Interface, and is used for classification and remarking of MPLS traffic using EXP values. Note that the FC-to-dot1p marking values configured on the port are also used to mark the dot1p in the VLAN tag, if any, used for MPLS traffic on some 7210 SAS devices.
The ingress component of the port policy type defines how the DSCP or dot1p bits are mapped to internal forwarding class (FC) and profile state. The ingress component of the ip-interface policy type defines how the EXP bits are mapped to the internal FC and profile state. The FC and profile state define the per-hop behavior (PHB) or the QoS treatment through the 7210 SAS. The ingress profile assignments using MPLS-EXP bits are defined using the mpls-lsp-exp-profile-map policy, which defines the mapping between the MPLS LSP EXP bits and the profile (in or out) associated with a packet.
The mapping on each ip-interface or port policy 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 bandwidth-limiting parameters for the traffic mapped to each FC. Traffic mapped to each FC can be limited to configurable bandwidth values using separate meters and queues for unicast and multipoint traffic. Multipoint is used for IP interfaces for MPLS traffic and for IP multicast traffic received on a network or hybrid port. On both network IP interface ingress and network port ingress, color-aware meters are provisioned by default to use the ingress profile assigned to the packet, if configured.
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-served 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 ip-interface policy type defines the LSP EXP bits marking values associated with each FC. The egress component of the network QoS port policy type defines the DSCP or dot1p bits marking values associated with each FC.
By default, all ports configured in network mode use the default network policy "1" and all network port IP interfaces use the default network policy "2". Default network policies "1" and "2" cannot be modified or deleted.
New (non-default) network policy parameters can be modified. The no form of this command reverts to the default values.
Changes made to a policy are applied immediately to all network ports, hybrid ports, and IP interfaces where the policy is applied. For this reason, when a policy requires several changes, Nokia recommends that you copy the policy to a work area policy-id. The work-in-progress copy can be modified until all the changes are made, and then the original policy-id can be overwritten using the config qos copy command.
See the ‟CLI Usage” chapter in the 7210 SAS-Mxp, R6, R12, S, Sx, T Basic System Configuration Guide for information about the tasks and commands required to access the CLI and to configure and maintain 7210 SAS devices.