SmartSwitch Router User Reference Manual 367Appendix A: New Features Supported on Line Cardson SSR C since SSR C does not have a -AA or T-series line card. SSR C would drop all SNAtraffic since its module would not recognize SNA traffic.QoS Rate LimitingThere are three types of rate limiting supported on the SSR:• Per-flow rate limiting• Aggregate rate limiting• Port rate limitingPer-Flow Rate LimitingPer-flow rate limiting allows a network administrator to specify a bandwidth limit on anIP flow. If an IP flow exceeds the bandwidth limit, the excess traffic is either dropped orassigned to a lower priority. An IP flow can be specified using the IP header, Source IP,Destination IP, Source Port, Destination Port, or ToS Byte information. A rate-limitingprofile is created to define the allowed bandwidth for this flow and then applied on theincoming IP interface.Ports that are associated with the incoming IP interface must reside on -AA or T-series linecards. Ports that are associated with the outgoing interface do not require -AA or T-seriesline cards because no rate-limiting profile is required on the interface. In Diagram 4, a rate-limiting profile can be created to limit bandwidth for traffic sent from Client A to Client Beven though Client B does not reside on a -AA or T-series line card. Note that in thecurrent Per-flow rate limiting implementation, a rate-limiting profile can apply only on alayer 3/4 flow.Aggregate Rate LimitingAggregate rate limiting allows a network administrator to specify a bandwidth limit on allflows that match one or more specified ACLs. You can use aggregate rate limiting to limittraffic to or from a particular subnet. A rate-limiting profile is created to define theallowed bandwidth for this traffic and then applied on the IP interface.Ports that are associated with the IP interface must reside on a single T-series line card. Youcannot apply an aggregate rate limiting policy to an interface that spans ports on morethan one line card.Port Rate LimitingPort rate limiting allows a network administrator to specify a bandwidth limit on aparticular port. You can limit either incoming or outgoing port traffic.Ports that are rate limited must reside on T-series line cards.
