H3C SR6600 Configuration Manual

Also see for SR6600 SPE-FWM: Configuration guide Configuration guide Command reference Command reference Command reference

Contents

17-7congestion occurs, packets with the FE flag bits set to 1 are dropped; as for forward packets to beforwarded, the FECN flag bits in the FR packet headers are set to 1; as for backward packets on thesame PVC, the BECN flag bits in the FR packet headers are set to 1. If no backward packets istransmitted within a period, the router automatically transmits the Q.922A Test Response packets withthe BECN flag bits set to 1 to the calling DTE.Figure 17-9 FR congestion management implementation帧中继网络DTE DCE NNIRouter A Router BData flow directionBECNFECNFrame-RelaynetworkFrame relaynetworkFR DE rule listIn an FR network, packets with the DE flag bits set to 1 are dropped first when congestion occurs in thenetwork. DE rule lists are applied on the FR PVCs of a router, with each DE rule list containing multipleDE rules. If a packet transmitted over the PVC matches the rules in the DE rule list, its DE flag bit is setto 1. The packet is dropped first when congestion occurs in the network.Configuring FR QoSFR QoS Configuration Task ListComplete the following tasks to configure FR QoS:Task RemarksCreating and Configuring an FR Class RequiredConfiguring FRTS OptionalConfiguring FR Traffic Policing OptionalConfiguring FR Congestion Management OptionalConfiguring FR DE Rule List OptionalConfiguring FR Queuing OptionalConfiguring FR Fragmentation OptionalCreating and Configuring an FR ClassThe system integrates QoS services on FR PVCs into FR classes to provide a flexible and completesolution for FR flow control and service quality. Before configuring QoS services such as FRTS, youmust create an FR class first, and then you can configure all the QoS parameters in the FR class. Thus,an FR class equals to a set of QoS network service solutions. Then, you can associate the FR classwith an FR PVC, that is, apply a set of QoS network service solutions to the FR PVC. You can associatean FR class with one or more PVCs.An FR PVC providing QoS services searches the corresponding FR class in the following order:z The frame class associated with the FR PVC