CISC-RT-000780 - The Cisco switch must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.
DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS) attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance, which denies access to the services that normally traverse the network or circuit. Volumetric attacks have become relatively easy to launch using readily available tools such as Low Orbit Ion Cannon or botnets. Measures to mitigate the effects of a successful volumetric attack must be taken to ensure that sufficient capacity is available for mission-critical traffic. Managing capacity may include, for example, establishing selected network usage priorities or quotas and enforcing them using rate limiting, Quality of Service (QoS), or other resource reservation control methods. These measures may also mitigate the effects of sudden decreases in network capacity that are the result of accidental or intentional physical damage to telecommunications facilities (such as cable cuts or weather-related outages). NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Step 1: Configure a class map for the SCAVENGER class. SW1(config)#class-map match-all SCAVENGER SW1(config-cmap)#match ip dscp cs1 Step 2: Add the SCAVENGER class to the policy map as shown in the example below: SW1(config)#policy-map QOS_POLICY SW1(config-pmap-c)#no class class-default SW1(config-pmap)#class SCAVENGER SW1(config-pmap-c)#bandwidth percent 5 SW1(config-pmap-c)#class class-default SW1(config-pmap-c)#bandwidth percent 10 SW1(config-pmap-c)#end