When the Cisco® Catalyst® 6500 Series Supervisor Engine 720 was introduced, it broughtwith it a number of new features that used hardware advancements found in the policyfeature card 3 (PFC3). In contrast to major features such as IPv6 and Multiprotocol LabelSwitching (MPLS) that gained a lot of attention, user-based rate limiting (UBRL) is onefeature that is not as well known.UBRL is a form of microflow policing allowing the administrator to rate limit traffic flows, but unlikea normal microflow policer, it allows a policer to be applied to all traffic to or from a specific user.This paper will explore UBRL in more detail by providing information about how UBRL works andsome examples as to how UBRL can be deployed and configured.
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