As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLSIPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the…

As shown in the figure, Site1 and Site2 need to achieve mutual access through the operator's BGP/MPLSIPVPN. It is known that the public network tunnel between PE1 and PE2 has been established (the label information is as shown in the figure), and PE1 has set 192.168 in Site1. The route of network segment 1.0/24 is advertised to PE2 through the MP-IBGP neighbor relationship, and route learning is normal. When crawling Site2 to access the 192.168.1.0/24 data of Site1 between P and PE1, which of the following is the outermost label?