Added the Ipv6 Primary and Secondary

Added the Ipv6 Primary and Secondary for NNI attribute table

Author: jdasari-msft

articles/operator-nexus/howto-configure-network-fabric.md

@@ -363,6 +363,8 @@ The following table specifies parameters used to create Network to Network Inter
 ||
 |primaryIpv4Prefix|IPv4 Prefix for connectivity between CE1 and PE1. CE1 port-channel interface is assigned the first usable IP from the prefix and the corresponding interface on PE1 should be assigned the second usable address|10.246.0.124/31, CE1 port-channel interface is assigned 10.246.0.125 and PE1 port-channel interface should be assigned 10.246.0.126||String
 |secondaryIpv4Prefix|IPv4 Prefix for connectivity between CE2 and PE2. CE2 port-channel interface is assigned the first usable IP from the prefix and the corresponding interface on PE2 should be assigned the second usable address|10.246.0.128/31, CE2 port-channel interface should be assigned 10.246.0.129 and PE2 port-channel interface 10.246.0.130||String
+|primaryIpv6Prefix|IPv6 Prefix for connectivity between CE1 and PE1. CE1 port-channel interface is assigned the first usable IP from the prefix and the corresponding interface on PE1 should be assigned the second usable address|3FFE:FFFF:0:CD30::a1 is assigned to CE1 and 3FFE:FFFF:0:CD30::a2 is assigned to PE1. Default value is 3FFE:FFFF:0:CD30::a0/126||String
+|secondaryIpv6Prefix|IPv6 Prefix for connectivity between CE2 and PE2. CE2 port-channel interface is assigned the first usable IP from the prefix and the corresponding interface on PE2 should be assigned the second usable address|3FFE:FFFF:0:CD30::a5 is assigned to CE2 and 3FFE:FFFF:0:CD30::a6 is assigned to PE2. Default value is 3FFE:FFFF:0:CD30::a4/126.||String
 |fabricAsn|ASN number assigned on CE for BGP peering with PE|65048||
 |peerAsn|ASN number assigned on PE for BGP peering with CE. For iBGP between PE/CE, the value should be same as fabricAsn, for eBGP the value should be different from fabricAsn |65048|True|
 |fabricAsn|ASN number assigned on CE for BGP peering with PE|65048||