单选题What is true about a Bypass Tunnel in MPLS Fast Reroute?（）AOnly configured on the egress routerBOnly configured on the ingress routerCIs pre-signalled to reduce packet lossDMust intersect the primary LSP at two locations
单选题
What is true about a Bypass Tunnel in MPLS Fast Reroute?（）
A
Only configured on the egress router
B
Only configured on the ingress router
C
Is pre-signalled to reduce packet loss
D
Must intersect the primary LSP at two locations
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