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Comparing M320, T-series, IQ, IQ2, and Enhanced IQ PICs

This section compares the major characteristics of the major PIC families in several ways. The following tables compare:

CoS Features of the PIC Families

Table 11 compares the PIC families with regard to major CoS features. Note that this table reflects the ability to perform the CoS function at the PIC level and not on the system as a whole.

Table 11: CoS Features of PIC Families Compared

Feature:	M320/T-series	IQ PICs	IQ2 PICs	Enhanced IQ PICs
BA classification	Yes	–	–	Yes
ToS bit rewrites	Yes	Yes, for IEEE bits only	Yes, for IEEE bits only	–
Ingress ToS bit rewrites	–	–	–	Yes
Hierarchical policers	–	–	–	Yes

Scheduling on the PIC Families

Table 12 compares the PIC families with regard to scheduling abilities or features. Note that this table reflects the ability to perform the function at the PIC level and not necessarily on the system as a whole.

Table 12: Scheduling on PIC Families Compared

Scheduling Feature:	M320/T-series	IQ PICs	IQ2 PICs	Enhanced IQ PICs
Per–unit scheduling	–	Yes	Yes	Yes
Physical port and logical unit shaping	–	–	Yes	Yes
Guaranteed rate or peak rate support	–	–	Yes	Yes, at the logical unit
Excess rate support	–	–	–	Yes, at the logical unit
Shared scheduler support	–	–	Yes	–

Schedulers on the PIC Families

Table 13 compares the PIC families with regard to scheduler statements or features. Note that this table reflects the ability to perform the scheduler function at the PIC level and not necessarily on the system as a whole.

Table 13: Schedulers on PIC Families Compared

Scheduler Statement or Feature:	M320/T-series	IQ PICs	IQ2 PICs	Enhanced IQ PICs
Exact	Yes	Yes	–	Yes
Rate-limit	–	–	Yes	Yes
Traffic shaping	–	–	–	Yes
More than one high-priority queue	Yes	Yes	–	Yes
Excess priority or sharing	–	–	–	Yes

Queuing Parameters for the PIC Families

Table 14 compares the PIC families with regard to queuing parameters and features.

Table 14: Queue Parameters on PIC Families Compared

Queuing Statement or Feature:	M320/T-series	IQ PICs	IQ2 PICs	Enhanced IQ PICs
Maximum number of queues	8	8 on M320 or T-series routing platforms, 4 on M7, M10, M20 routers	8	8
Maximum delay buffer bandwidth	80 ms: Type 1 and 2 FPC, 50 ms: Type 3 FPC	100 ms	200 ms	up to 4000 ms
Packet transmit priority level	3 and 3	2 and 2	2	3 and 2
Maximum number of drop profiles	32 (32 samples)	32 (32 samples)	32	64
Packet loss priority level	4	4	4	4

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