Users Guide

Table 13. Queues 14 to 20 Process Packets Destined to the line-card CPU
Service
Queue
CPU
Type
Protocols Mapped to Control Processor Queues Rate Limit
(in kbps)
Burst (in
kbps)
14 LP/LM — 1 4000
15 LP/LM — 1 100
16 LP/LM Trace Flow, Station Move, Source Miss 1200 100
17 LP/LM BFD, ACL LOGGING 1200 1000
18 LP/LM — 7000 1000
19 LP/LM FRRP, Hyperpull 800 7000
20 LP/LM LP/LM SFLOW 5000 1000
NOTE: In the line-card CPU, some queues have no protocol traffic mapped to them. These rows
appear blank in the preceding table.
CoPP Example
The illustrations in this section show the benefit of using CoPP compared to not using CoPP on a switch.
The following illustration shows how CoPP rate limits protocol traffic destined to the control-plane CPU.
Figure 26. Control Plane Policing
NOTE: On the system, CoPP does not convert the input rate of control-plane traffic from kilobits
per second (kbps) to packets per second (pps) as on other Dell Networking switches. On other
switch, CoPP converts the input kilobit-per-second rate to a packet-per-second rate, assuming 64
bytes as the average packet size. CoPP then applies the packet-per-second rate to the appropriate
queue. On these switches, 1 kbps is approximately equal to 2 pps.
The following illustration shows the difference between using CoPP and not using CoPP on a switch.
Control Plane Policing (CoPP)
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