Appendix – What Just Happened® Reasons
| 
     Category  | 
                
     Name  | 
                
     Description  | 
                
     Severity  | 
        
| 
     Ethernet  | 
                
     Ingress Packet Reserved DMAC  | 
                
     Destination MAC is Reserved (DMAC=01-80-C2-00-00-0x)  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Ingress Switch Vtag Allow  | 
                
     VLAN tagging mismatch  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Ingress Switch VLAN  | 
                
     VLAN filtering  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Ingress Switch STP  | 
                
     Ingress spanning tree filter  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Lookup Switch UC  | 
                
     Unicast FDB discard  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Lookup Switch MC Null  | 
                
     Multicast list is empty  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Lookup Switch LB  | 
                
     Port loopback filter  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Ingress Packet SMAC is MC  | 
                
     Source MAC is multicast  | 
                
     Notice  | 
        
| 
     Ethernet  | 
                
     Ingress Packet SMAC Equals DMAC  | 
                
     Source MAC equals destination MAC  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router No HDR  | 
                
     Non IP packet  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router UC DIP MC DMAC  | 
                
     Unicast destination IP but non-unicast destination MAC  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router DIP LB  | 
                
     Destination IP is loopback address  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP MC  | 
                
     Source IP is multicast  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP Class E  | 
                
     Source IP is in class E  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP LB  | 
                
     Source IP is loopback  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP Unspecified  | 
                
     Source IP is not specified  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router IP HDR  | 
                
     Checksum or IPver or IPv4 IHL too short  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router MC DMAC  | 
                
     Multicast MAC mismatch  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP Equals DIP  | 
                
     Source IP equals to destination IP  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router SIP BC  | 
                
     IPv4 source IP is limited broadcast  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router DIP Local Network  | 
                
     IPv4 destination IP is local network  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Ingress Router DIP Link Local  | 
                
     IPv4 destination IP is link local  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Router IRIF Disabled  | 
                
     Ingress IP interface is disabled  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Router ERIF Disabled  | 
                
     Egress IP interface is disabled  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Router LPM4  | 
                
     IPv4 LPM unicast miss  | 
                
     Notice  | 
        
| 
     IP  | 
                
     Router LPM6  | 
                
     IPv6 LPM unicast miss  | 
                
     Notice  | 
        
| 
     IP  | 
                
     MC Scope IPv6 0  | 
                
     IPv6 destination in multicast scope FFx0:/16  | 
                
     Notice  | 
        
| 
     IP  | 
                
     MC Scope IPv6 1  | 
                
     IPv6 destination in multicast scope FFx1:/16  | 
                
     Notice  | 
        
| 
     Tunnel  | 
                
     Decapsulation Packet  | 
                
     Remained packet is too short  | 
                
     Notice  | 
        
| 
     Tunnel  | 
                
     Decapsulation Error  | 
                
     Decapsulation error  | 
                
     Notice  | 
        
| 
     Tunnel  | 
                
     Overlay Switch SMAC Multicast  | 
                
     Overlay: source MAC is multicast  | 
                
     Notice  | 
        
| 
     Tunnel  | 
                
     Overlay Switch SMAC Equals DMAC  | 
                
     Overlay: source MAC equals destination MAC  | 
                
     Notice  |