vyos@vyos:~$ configure
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vyos@vyos# set protocols static arp interface eth0 address 192.168.139.101 mac 00:0a:0a:0a:0a:0a
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vyos@vyos# commit
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vyos@vyos# run show arp
Address          Interface    Link layer address    State
---------------  -----------  --------------------  ---------
192.168.139.2    eth0         00:50:56:fa:ad:3a     REACHABLE
192.168.139.101  eth0         00:0a:0a:0a:0a:0a     PERMANENT
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vyos@vyos# delete protocols static arp
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vyos@vyos# commit
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vyos@vyos# run show arp
Address          Interface    Link layer address    State
---------------  -----------  --------------------  ---------
192.168.139.2    eth0         00:50:56:fa:ad:3a     STALE
192.168.139.101  eth0         00:0a:0a:0a:0a:0a     PERMANENT
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