Hierarchical Rate Limits ! 83
Chapter 3: Creating Rate-Limit Profiles
host1(config-rate-limit-profile)#peak-rate 40000000
host1(config-rate-limit-profile)#exit
host1(config)#policy-list rlpshare
host1(config-policy-list)#classifier-group A parent-group All
host1(config-policy-list-classifier-group)#forward
host1(config-policy-list-classifier-group)#exit
host1(config-policy-list)#classifier-group B parent-group All
host1(config-policy-list-classifier-group)#forward
host1(config-policy-list-classifier-group)#exit
host1(config-policy-list)#classifier-group C parent-group All
host1(config-policy-list-classifier-group)#forward
host1(config-policy-list-classifier-group)#exit
host1(config-policy-list)#parent-group All
host1(config-policy-list-parent-group)#rate-limit-profile All
host1(config-policy-list-parent-group)#exit
Shared Pool of Additional Bandwidth with Select Flows
Figure 5 shows three classified flows, A, B, and C, each of which has an individual
rate limit with a peak rate of 1 Mbps. If flow A is exceeding its peak rate, rather than
drop the packet, the flow tries to use any bandwidth left in a shared rate limit
(extrabw) of peak rate of 2 Mbps. The packet is dropped only if both the individual
and the shared rate limit have no bandwidth left.
The total flow is limited to 5 Mbps, which is the sum of all the individual peak rates
plus the peak rate of the shared rate limit. Individual flows A, B, and C are limited to
a maximum of 3 Mbps (1 Mbps from its individual rate limit and up to 2 Mbps if it
can consume the entire shared pool); however, it cannot go below a 1 Mbps rate
because of the other flows. A shared rate limit enables many flows to share the
extra bandwidth dynamically.
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