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[arp_update]: Set failed IPv6 neighbors to incomplete #11919

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Sep 2, 2022
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[arp_update]: Set failed IPv6 neighbors to incomplete #11919

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cc66a16
[arp_update]: Set failed IPv6 neighbors to incomplete
theasianpianist Sep 1, 2022
f2f7d83
[arp_update]: set entries to incomplete before ping
theasianpianist Sep 1, 2022
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11 changes: 11 additions & 0 deletions files/scripts/arp_update
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,17 @@ while /bin/true; do
eval `eval $ip6cmd`

if [[ $SUBTYPE == "dualtor" ]]; then
# manually set any remaining FAILED/INCOMPLETE entries to permanently INCOMPLETE
# this prevents any remaining INCOMPLETE entries from automatically transitioning to FAILED
# once these entries are incomplete, any subsequent neighbor advertisement messages
# are able to resolve the entry

# generates the following command for each failed or incomplete IPv6 neighbor
# ip neigh replace <neighbor IPv6> dev <VLAN name> nud incomplete
neigh_replace_template="sed -e 's/^/ip neigh replace /' -e 's/,/ dev /' -e 's/$/ nud incomplete;/'"
ip_neigh_replace_cmd="ip -6 neigh show | grep -v fe80 | grep Vlan1000 | grep -E 'FAILED|INCOMPLETE' | cut -d ' ' -f 1,3 --output-delimiter=',' | $neigh_replace_template"
eval `eval $ip_neigh_replace_cmd`

# on dual ToR devices, try to resolve failed neighbor entries since
# these entries will have tunnel routes installed, preventing normal
# neighbor resolution (SWSS PR #2137)
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