Netgear M4300-24X24F (XSM4348S) - Stackable Managed Switch with 48x10G including 24x10GBASE-T and 24xSFP+ Layer 3 Manual Do Utilizador

To configure DiffServ, you must define service levels, namely the forwarding classes/PHBs 
identified by a given DSCP value, on the egress interface. These service levels are defined 
by configuring BA classes for each.

Use DiffServ policies to associate a collection of classes that you configure with one or more 
QoS policy statements. The result of this association is referred to as a policy. 

From a DiffServ perspective, there are two types of policies:

: a policy applied to a DiffServ traffic class

: a policy applied to a DiffServ service level

You must manually configure the various statements and rules used in the traffic conditioning 
and service provisioning policies to achieve the desired Traffic Conditioning Specification 
(TCS) and the Service Level Specification (SLS) operation, respectively. 

Traffic conditioning pertains to actions performed on incoming traffic. There are several 
distinct QoS actions associated with traffic conditioning:

. Drop a packet upon arrival. This is useful for emulating access control list 

operation using DiffServ, especially when DiffServ and ACL cannot co-exist on the same 
interface.

. Marking/re-marking the DiffServ code point in a 

packet with the DSCP value representing the service level associated with a particular 
DiffServ traffic class. Alternatively, the IP Precedence value of the packet can be 
marked/re-marked.

. Sets the three-bit priority field in the first/only 802.1p header to a 

specified value when packets are transmitted for the traffic class. An 802.1p header is 
inserted if it does not already exist. This is useful for assigning a Layer 2 priority level 
based on a DiffServ forwarding class (such as the DSCP or IP precedence value) 
definition to convey some QoS characteristics to downstream switches which do not 
routinely look at the DSCP value in the IP header.

. A method of constraining incoming traffic associated with a particular class so 

that it conforms to the terms of the TCS. Special treatment can be applied to out-of-profile 
packets that are either in excess of the conformance specification or are non-conformant. 
The DiffServ feature supports the following types of traffic policing treatments (actions):

drop. The packet is dropped

mark cos. The 802.1p user priority bits are (re)marked and forwarded

mark dscp. The packet DSCP is (re)marked and forwarded

mark prec. The packet IP Precedence is (re)marked and forwarded

send: the packet is forwarded without DiffServ modification

. Policing in the DiffServ feature uses either color blind or color 

 mode. Color blind mode ignores the coloration (marking) of the incoming packet.