[swss][arp_update] Send ipv6 pings over vlan sub interfaces (#8363)

#### Why I did it * `arp_update` fails to ping those neighbors over vlan sub interfaces. #### How I did it * modify `arp_update_vars.j2` to get vlan sub interfaces with ipv6 addresses assigned. * modify `arp_update` to send ipv6 pings over those retrieved vlan sub interfaces. Signed-off-by: Longxiang Lyu <[email protected]>
sonic-net · Aug 7, 2021 · 25f5328 · 25f5328
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commit 25f5328
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diff --git a/files/build_templates/arp_update_vars.j2 b/files/build_templates/arp_update_vars.j2
@@ -1,5 +1,6 @@
 {
  "interface": "{% for (name, prefix) in INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
  "pc_interface" : "{% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
+ "vlan_sub_interface": "{% for (name, prefix) in VLAN_SUB_INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
  "vlan" : "{% if VLAN %}{{ VLAN.keys() | join(' ') }}{% endif %}"
 }
diff --git a/files/scripts/arp_update b/files/scripts/arp_update
@@ -14,8 +14,9 @@ while /bin/true; do
  ARP_UPDATE_VARS=$(sonic-cfggen -d -t ${ARP_UPDATE_VARS_FILE})
  INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.interface')
  PC_INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.pc_interface')
+ VLAN_SUB_INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.vlan_sub_interface')
 
- ALL_INTERFACE="$INTERFACE $PC_INTERFACE"
+ ALL_INTERFACE="$INTERFACE $PC_INTERFACE $VLAN_SUB_INTERFACE"
  for intf in $ALL_INTERFACE; do
  ping6cmd="ping6 -I $intf -n -q -i 0 -c 1 -W 0 ff02::1 >/dev/null"
  intf_up=$(ip link show $intf | grep "state UP")