Example: Shared Pool Of Additional Bandwidth With Select Flows Rate-Limiting Hierarchical Policy; Figure 4: Shared Pool Of Additional Bandwidth With Select Flows - Juniper POLICY MANAGEMENT - CONFIGURATION GUIDE V11.1.X Configuration Manual

Example: Shared Pool of Additional Bandwidth with Select Flows Rate-Limiting Hierarchical
Policy
Figure 4 on page 69 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.

Figure 4: Shared Pool of Additional Bandwidth with Select Flows

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
Chapter 5: Creating Rate-Limit Profiles
Hierarchical Rate Limits Overview
69