Manage VCCV BFD session state

The ping-multiplier statement is introduced to delay the virtual circuit connectivity verification (VCCV) Bidirectional Forwarding Detection (BFD) session from going down by the specified number of LSP ping packets. The VCCV BFD session is signaled down only after the specified number of LSP ping packets are lost. This feature is supported for Layer 2 Circuit, Layer 2 VPN, and VPLS technologies. 

To configure the LSP ping multiplier feature, include the ping-multiplier number-of-packets statement at the [edit protocols l2circuit neighbor neighbor-address interface interface-name oam], [edit routing-instances routing-instances-name protocols l2vpn oam], and [edit routing-instances routing-instances-name protocols vpls oam] hierarchy levels for Layer 2 circuit, Layer 2 VPN, and VPLS, respectively.