Analysis: In the question, it is not stated whether the source and the target belong to the same group, but whether they are in the same group or different groups, by default, the groups cannot visit each other, and the policies within the group and the policies between the groups are the same. By default, the default access control policy for unknown EPG group members is permit, which allows unknown EPG group members to access each other and allows unknown members to access each other Mutual access between EPG group members and known EPG group members. By default, the default access control policy for EPG group members is deny, that is, members of EPG groups cannot access each other. For different CE switch models, there are differences in the default access control policies between members within an EPG group.