Hi Brett,   You need the advanced feature set to run MPLS on this platform.   Regards, ... View more

> Under what circumstances would you choose to use a Unique Local Address (ULA) over a Global Unicast Address (GUA) for > your hosts? If GUA's are globally unique all over the world, in what situations would using ULA's be appropriate?   I would personally not use ULA. I guess one could plan to use ULA if there is a certain level of certainty that the application will never have to access the Internet, but would could be sure of that these days.   > Since there is no NAT in IPv6, im assuming that the ULA will be used for all internal communications between internal subnets > and GUA address is used for anything that needs to go external?   I would just use GUA for both.   > From a routing table perspective, if you are using GUA's internally, will the routing table in the router just be filled with GUA > addresses?    The internal routing table would have GUA indeed, but only internal to your network. You would still use a default route to reach the Internet.   > I've never worked with IPv6 so these address types and use cases are little confusing.   Not a problem. This is exactly what this forum is all about. Let us know if you have more doubts/questions.   Regards,     ... View more

I would suggest not using NAT66. Since the SP gives you a PD, you should have sufficient space to configure IPv6 on the XE device and the L3 switches and run routing towards the Internet.   Regards, ... View more

> Global Unicast Address : I gather that this is the equivalent to a "public" IPv4 address but for IPv6   Correct.   > and that your internal addresses would be NATed to one of these addresses for routing on the internet?   Your internal address will most likely be the GUA as well, as NAT is not recommended in the IPv6 context.   > Im assuming the ISP doles these out to their customers the same as they do public IPv4 addresses?   Correct.   > Unique-Local Address: I gather that this is equivalent to a private IPv4 address that is only routable on the internal network?   Correct.   > Is this an address you would give out internally via DHCP?   In general, the recommendation is to assign GUA in the internal network to provide global connectivity.   > Link-Local Address: I gather that this is always autoassigned by the NIC to itself (similar to an APIPA address)   The LLA is derived from the MAC address by default. It is auto assigned by the IPv6 stack, not by the NIC.   > and is used for local broadcast domain communications only?   Correct.   > With all these different address types, Im assuming that an IPv6 NIC could have one or more of these addresses assigned > to it at any one time?   Correct. In the context of IPv6, an interface generally have one LLA and one or more GUA or ULA.   Regards,     ... View more

> 1) Can I say tht local-link address is just local significance. Therefore every site/router can configure the same link-local > address like router is FE80::8300:500:1:1 and core switch is FE80::8300:500:1:2. It will not conflict.    Correct.   > 2)Can I say every interfaces in a router can also configure the same link-local address?   Also correct.   > 3) Is link-local used just to verify p2p link connectivity and interface (i.e. router to core switch connectivity & its > connected interfaces). Is it use for other purposes?   Link-Local address are used for many purposes. Among others, for the Neighbor Discovery (ND) process and for routing protocol communication between adjacent routers.   > 5) Also I noticed link-local address doesnt have any subnet like /64, /127,etc. Does it means it is /128?   The link-local addresses are defined by RFC4291 and have a fix format, hence we do not need to configure the prefix length.   2.5.6. Link-Local IPv6 Unicast Addresses Link-Local addresses are for use on a single link. Link-Local addresses have the following format: | 10 | | bits | 54 bits | 64 bits | +----------+-------------------------+----------------------------+ |1111111010| 0 | interface ID | +----------+-------------------------+----------------------------+ Link-Local addresses are designed to be used for addressing on a single link for purposes such as automatic address configuration, neighbor discovery, or when no routers are present. Routers must not forward any packets with Link-Local source or destination addresses to other links.   Regards, ... View more

You want to use the command "show ip nat translations" if you are using nat44. "show nat trans" is a short for "show nat64 translations"   Regards, ... View more

The subnet ID of all 0 is just the default value for the IPv6 anycast address.   Router(config-if)#ipv6 address 2001:db8:12ff:12::/64 %GigabitEthernet0/1: Warning: 2001:DB8:12FF:12::/64 is a Subnet Router Anycast Router(config-if)#   As indicated in the book, you can choose any value you want by configuring the anycast address with the "anycast" keyword.   Router(config-if)#ipv6 address 2001:DB8:12FF:12::99/64 anycast Router(config-if)#do sh ipv6 int gi0/1 GigabitEthernet0/1 is up, line protocol is up IPv6 is enabled, link-local address is FE80::F816:3EFF:FEEA:BC52 No Virtual link-local address(es): Global unicast address(es): 2001:DB8:12FF:12::1, subnet is 2001:DB8:12FF:12::/64 2001:DB8:12FF:12::99, subnet is 2001:DB8:12FF:12::/64 [ANY] ...   Regards, ... View more