BGP FlowSpec Client Function and Interface Policies Installation

A.

The correct configuration to enable BGP FlowSpec client function and installation of policies on all local interfaces is option B: "flowspec address-family ipv4 install interface-all local".

BGP FlowSpec is a feature that allows network operators to mitigate DDoS attacks by quickly propagating traffic filtering policies across their network. When enabled, FlowSpec can be used to redirect traffic to a mitigation device, drop traffic, or rate-limit traffic. FlowSpec can also be used to enforce QoS policies on specific traffic flows.

In BGP, address families are used to support different types of network layer protocols. The "ipv4" address family is used to support IPv4 networks. To enable FlowSpec on the IPv4 address family, the "flowspec address-family ipv4" command is used.

The "install" keyword is used to enable the installation of FlowSpec policies on the router. The "interface-all" keyword specifies that the policies should be installed on all local interfaces. The "local" keyword specifies that the policies should be installed on the router itself.

Option A ("flowspec address-family ipv4 local-install interface-all") is incorrect because it uses the "local-install" keyword, which only installs policies on the router itself and not on local interfaces.

Option C ("flowspec address-family ipv4 install interface-all") is incorrect because it does not specify that policies should be installed on the router itself using the "local" keyword.

Option D ("flowspec address-family ipv4 local-install all-interface") is incorrect because it uses the incorrect syntax for specifying all local interfaces. The correct syntax is "interface-all".