
某台路由器运行IS-IS,其输出信息如下所示,下列说法正确的是()。displayisisinterfaceverboseInterfaceinformationforISIS(1)------------------------------------------InterfaceIdIPV4.StateIPV6.StateTyteDISS4/0/0001UpDownL1--CircuitMTState:StandardIPAddress:10.0.12.1CsnpTimerValue:L1210HelloTimerValue:10DISHelloTimerValue:HelloMultiplierValue:3Cost:L110L210Ipv6Cost:L110L210RetransmitTimerValue:L125Extended-Circuit-IdValue:0000000001
A.S4/0/0接口发送IIH的周期为30s
B.S4/0/0接口的circuit-level为Level-1
C.S4/0/0接口的Cost值为20
D.S4/0/0接口支持IPv6
