Trap DHCPv6 packets for supporting ZTP over in-band interfaces using … (sonic-net#997)

* Trap DHCPv6 packets for supporting ZTP over in-band interfaces using DHCPv6 discovery

Also increase incoming packet rate on in-band interfaces to support faster
download of large files. SONiC firmware image download over in-band can
take a lot of time if the incoming packet rate is limited to 600pps. This,
change increases it to 6000pps.

Signed-off-by: Rajendra Dendukuri <[email protected]>

Author: rajendra-dendukuri

swssconfig/sample/00-copp.config.json

@@ -34,8 +34,8 @@
         "OP": "SET"
     },
     {
-        "COPP_TABLE:trap.group.lldp.dhcp.udld": {
-            "trap_ids": "lldp,dhcp,udld",
+        "COPP_TABLE:trap.group.lldp.dhcp.dhcpv6.udld": {
+            "trap_ids": "lldp,dhcp,dhcpv6,udld",
             "trap_action":"trap",
             "trap_priority":"4",
             "queue": "4"