"Eight VC4's are running on single Ethernet trunk. LCAS is enabled. If one of 8 vc4's is down, it is generating ALM_GFP_dLFD for 4-5 seconds. Its resulting in service interruption"
The path level alarms will in turn trigger the GFP related alarm and this is temporary interruption. please check the attachment.
(1) LCAS is at the node with addition or deletion of members will increase or decrease the traffic accordingly. The service is hitless and will be smooth transition as per LCAS protocol defined in G.7042 (highlighted in Red line)
(2) In case of Path disturbances (Signal Fail, Signal Degrade etc) ie. at the transport layer (SDH layer), the TSF will propagate the alarms to the higher layer in GFP as given in the G.7041 below.
The GFP alarms will be generated based on the TSF generation and ingress client process. TSF alarms generation and consequent action are discussed in G.806.
(3)The service enabled with LCAS will allow a minor interruption only and not a service fail. The G.7042 highlights this as given below.
(1)LCAS ensures a smooth increase / decrease of traffic for member addition and deletion.
(2)LCAS is not hitless for any path level alarms.
(3)GFP alarms is triggered in case of path level alarms