问题：

[多选]

Routers R1 and R2 are OSPF neighbors using their Fa0/0 interfaces, respectively, using default settings for all timers. An engineer ad ds the ip ospf hello - interval 6 command to R1's Fa0/0 configuration.
Which of the following is true regarding the results from this change?（）

A . The show ip ospf neighbor command on R1 lists the revised Hello timer
B . The show ip ospf interfac e brief command on R1 lists the revised Hello timer
C . The R1 - R2 neighborship fails due to Hello timer mismatcH
D . The show ip ospf interface command on R1 lists the revised Hello timer