I want to know how to config syslog service on cisco router 10720.is the following right?logging host x.x.x.xlogging trap xlogging facility local 7and what's mean of "facility"?

I want to know,on a same switch,can I configure VTP and GVRP at the same time?how they deal with the received VLAN information?thanks

I want to know,when configing VLAN,is there the notion of tag or untag mode on the VLAN port?