单选题In which Cisco IOS configuration mode is the route distinguisher （RD） configured？（）AR1（config-route-at）#BR1（config-route-map）#CR1（config-it）#DR1（config-vrf）#ER1（config）#FR1（router）#
单选题
In which Cisco IOS configuration mode is the route distinguisher （RD） configured？（）
A
R1（config-route-at）#
B
R1（config-route-map）#
C
R1（config-it）#
D
R1（config-vrf）#
E
R1（config）#
F
R1（router）#
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