09-19-2018 10:57 AM
hello all,
I have a quick question about subnetting IPv6. in IPv4, when you subnet, you are not allowed to use certain addresses in the subnet, namely first and last address, because they are network and broadcast. however, I understand that there is no IPv6 broadcast anymore, so does this mean that you are now allowed to assign the last address in a block with IPv6, or has it been reserved for something else? also I am assuming the first address is still unusable because it is technically the network address. is this assumption correct?
09-19-2018 11:10 AM
09-19-2018 05:15 PM
Some addresses are also reserved for anycast purposes as described by RFC4291, section 2.6.1 and RFC2526.
IOS will issue the following warning if you configure any of those addresses.
CE1(config-if)#ipv6 address 2001:db8:12ff:ffff::/64
%Loopback0: Warning: 2001:DB8:12FF:FFFF::/64 is a Subnet Router Anycast
CE1(config-if)#ipv6 address 2001:db8:12ff:1234:ffff:ffff:ffff:ffff/64
%Loopback0: Warning: 2001:DB8:12FF:1234:FFFF:FFFF:FFFF:FFFF/64 is a Reserved Anycast
Regards,
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