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arp inspection fails on specific vlan

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Experts,

 

ge-0/0/6                   24                      0                     24

 

where 24 is of ARP inspection failed,

 

ge-0/0/6:

description "Voice&Data";
unit 0 {
family ethernet-switching {
port-mode access;
vlan {
members 20;
}
}
}

 

secure access port settings:

 

interface ae0.0 {
dhcp-trusted;
}
vlan v20 {
arp-inspection;
examine-dhcp;
ip-source-guard;
}

 

v20 = vlan20

 

the port is data & voice but only one PC is connected directly to that port. ARP fails also on other access port where only MAC computer is connected. 


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