Traffic bound to CPU received on VPRN access interfaces are policed/rate-limited and queued into CPU queues. The software allocates a policer per IP application or a set of IP applications, for rate-limiting CPU bound IP traffic from all VPRN access SAPs. The policers CIR/PIR values are set to appropriate values based on feature scaling and these values are not user configurable. The software allocates a set of queues for CPU bound IP traffic from all VPRN access SAPs. The queues are either shared by a set of IP applications or in some cases allocated to an IP application. The queues are shaped to appropriate rate based on feature scaling. The shaper rate is not user configurable.
The instance of queues and policers used for traffic received on network port IP interfaces is different for traffic received from access port IP interfaces. Additionally, the network CPU queues are accorded higher priority than the access CPU queues. This is done to provide better security and mitigate the risk of access traffic affecting network traffic.
The 7210 SAS-Mxp allows the user to configure the IP differentiated services code point (DSCP) value for self-generated traffic. On the 7210 SAS-T, 7210 SAS-Sx/S 1/10GE, and 7210 SAS-Sx 10/100GE, IP DSCP marking of self-generated traffic is not user-configurable and is assigned by software.