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3.4 Network Interface Communication Failure 27
3.4.1 Ethernet Port Cannot Be Connected 27
3.4.2 Communication Failure in Basic Switching Unit BSU/PSP 29
3.4.3 Actions against Troubles on 10BASE-T/100BASE-TX/1000BASE-T 30
3.4.4 Actions against Troubles on 1000BASE-X 32
3.4.5 Actions against Troubles on 10GBASE-R 33
3.4.6 Communication Failure on Using PoE 35
3.4.7 Communication Failure on Using Link Aggregation 36
3.5 Layer 2 Network Communication Failure 38
3.5.1 Layer 2 Communication by VLAN Is Disabled 38
3.5.2 Failures on Using Spanning Tree 40
3.5.3 Failures on Using Ring Protocol 41
3.5.4 Multicast Relay by IGMP snooping Is Disabled 44
3.5.5 Multicast Relay by MLD snooping Is Disabled 47
3.6 IPv4 Network Communication Failure 50
3.6.1 Communication Is Disabled or Is Disconnected 50
3.6.2 IP Addresses Cannot Be Assigned Using DHCP Function 54
3.6.3 DynamicDNS Cooperation in DHCP Function Is Disabled 58
3.7 IPv4 Unicast Routing Communication Failure 61
3.7.1 No RIP Routing Information Exists 61
3.7.2 No OSPF Routing Information Exists 61
3.7.3 No BGP4 Routing Information Exists 62
3.7.4 No Routing Information Exist [OP-NPAR] 62
3.8 IPv4 Multicast Routing Communication Failure 63
3.8.1 Communication on IPv4 PIM-SM Network Is Disabled 63
3.8.2 Multicast Data Is Double-relayed on IPv4 PIM-SM Network 66
3.8.3 Communication on IPv4 PIM-SSM Network Is Disabled 67
3.8.4 Multicast Data Is Double-relayed on IPv4 PIM-SSM Network 69
3.8.5 IPv4 Multicast Communication Failure In VRF [OP-NPAR] 70
3.9 IPv6 Network Communication Failure 71
3.9.1 Communication Is Disabled or Is Disconnected 71
3.9.2 IPv6 DHCP Troubleshooting 73
3.10 IPv6 Unicast Routing Communication Failure 79
3.10.1 No RIPng Routing Information Exists 79
3.10.2 No OSPFv3 Routing Information Exists 79
3.10.3 No BGP4+ Routing Information Exists 80
3.11 IPv6 Multicast Routing Communication Failure 81
3.11.1 Communication on IPv6 PIM-SM Network Is Disabled 81
3.11.2 Multicast Data Is Double-relayed on IPv6 PIM-SM Network 84
3.11.3 Communication on IPv6 PIM-SSM Network Is Disabled 85
3.11.4 Multicast Data Is Double-relayed on IPv6 PIM-SSM Network 87
3.12 Layer 2 Authentication Communication Failure 89
3.12.1 Communication Failure on Using IEEE 802.1X 89
3.12.2 Communication Failure on Using Web Authentication 92
3.12.3 Communication Failure on Using MAC Authentication 97
3.12.4 Communication Failure on Using Authentication VLAN [OP-VAA] 99