Topology: NE 40A==transmission===NE40B NE40 version VRP3.10-2226. NE40 uses L2 board and connects through transmission. Use VRRP and both sides are master.
Configure VLAN tag in the transmission.
Through debug it is found that NE40 of both sides only sends heartbeat packet of VRRP and does not receive opposite heartbeat packet. It indicates that VRRP heartbeat packet cannot normally interact, so both sides are master.
Delete VRRP configuration at L3 vlan interface of two NE40. VLAN L3 interface carried tag cannot ping mutually. VLAN L3 interface without tag can ping. According to the test the intermediate transmission link is normal, but it cannot transparent transmit data packet with vlan. Check transmission and the transmission is not configured with VLAN transparent.