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Update arp_update to refresh neighbor entries from APP_DB #4125

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Merged
prsunny merged 1 commit into from
Feb 13, 2020
Merged

Update arp_update to refresh neighbor entries from APP_DB #4125

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21 changes: 21 additions & 0 deletions files/scripts/arp_update
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Original file line number Diff line number Diff line change
Expand Up @@ -46,5 +46,26 @@ while /bin/true; do
ip6cmd="ip -6 neigh show | grep -v fe80 | grep $vlan | cut -d ' ' -f 1,3 | $ndisc6cmd"
eval `eval $ip6cmd`
done

# refresh neighbor entries from APP_DB in case of mismatch with kernel
DBNEIGH=$(sonic-db-cli APPL_DB keys NEIGH_TABLE*)
KERNEIGH4=$(ip -4 neigh show | grep Vlan | cut -d ' ' -f 1,3 --output-delimiter=',')
KERNEIGH6=$(ip -6 neigh show | grep -v fe80 | grep Vlan | cut -d ' ' -f 1,3 --output-delimiter=',')
for neigh in $DBNEIGH; do
intf="$( cut -d ':' -f 2 <<< "$neigh" )"
ip="$( cut -d ':' -f 3- <<< "$neigh" )"
if [[ $intf == *"Vlan"* ]]; then
if [[ $ip == *"."* ]] && [[ ! $KERNEIGH4 =~ "${ip},${intf}" ]]; then
pingcmd="timeout 0.2 ping -I $intf -n -q -i 0 -c 1 -W 1 $ip >/dev/null"
eval $pingcmd
logger "arp_update: mismatch arp entry, pinging ${ip} on ${intf}"
elif [[ $ip == *":"* ]] && [[ ! $KERNEIGH6 =~ "${ip},${intf}" ]]; then
ping6cmd="timeout 0.2 ping6 -I $intf -n -q -i 0 -c 1 -W 1 $ip >/dev/null"
eval $ping6cmd
logger "arp_update: mismatch v6 nbr entry, pinging ${ip} on ${intf}"
fi
fi
done

sleep 300
done