IPV6 doubt

[NtwrkAnkS]

Ok so i was playing around with ipv6 and i noticed that the mac address of my f0/0 interface is cc00.0320.0000 but the link-local address is assigned to be FE80::CE00:3FF:FE20:0. I thought it should be ::CC00:3FF:FE20:0 since that is the mac add of the port if you remove FFFE, can someone please explain this to me???


Ankur

[Scott Morris]

The "other" part it does is flip the U/L bit. 000000x0 of your first byte. If that bit is 0, it is a universally assigned number (CC in your case). If that bit is a 1, it's a locally assigned, or locally manipulated value (CE).

Now, personally, I think it's stupid. Academia at work. I mean, if you can't figure out, that in going from 48-bits to 64-bits, something got manipulated... Then you have issues. But that's just my opinion! They made the standards without consulting me! (grin)


Scott

[NtwrkAnkS]

Thank you so much Scott for replying , you are always the best person to go to for any problem...

But i still have my doubt ,
Universal/Local (U/L)
The seventh bit in an IPv6 interface identifier is referred to as the universal/local bit, or U/L bit. This bit identifies whether this interface identifier is universally or locally administered.
If the U/L bit is set to 0, the address is locally administered and if the U/L bit is set to 1, the IEEE, through the designation of an ISP, has administered the address.
From this i understand that if its a link-local address the bit should remain 0 to indicate local scope and if it is 1 then it will be global scoped... I am very confused now


Please Help!!!!

[IntegrationArchitect]

Setting aside that IPv6 is creeping into exams for a moment.
How far out (date) do you estimate US Domestic ISP's offering IPv6 to T1 customers(*)?
When do you estimate it will be recommended?
When do you est. it's mandatory?

(*) I imangine it would be regional like we see only some citys offer Internet Broadband 4G, most 3G, some only 2G, some nada.

[Scott Morris]

Not sure where you saw it referenced that way, but that is backwards.

Check out http://en.wikipedia.org/wiki/MAC_address

As for deployment and need for IPv6, that will vary by your location! We're running out of IPv4 addresses, but on the other hand, there's a lot of effort being put into reclaiming and reusing addresses. Still harder to get though!
Even right now, there are different levels of addressing used. You can have IPv6 in one network talking to IPv4 just fine in other networks....
So when will you need to change? *shrug* Today, you'll be struggling to find carriers with FULL support for Ipv6. Most have tested, but not all have fully implemented it through their networks.
Most likely Asian/Middle-Eastern countries will come first where the people/devices:addresses ratio is greater.
We'll see it sometime though, so you'd better get familiar with it at some time!


Scott

[IntegrationArchitect]

I think you were saying to look at this time schedule, instead of the MAC one. LINK BELOW (Unless your saying that due to MAC address running out of address for manufactures that it will mandate IPv6?? first on the LAN side? )

http://en.wikipedia.org/wiki/IPv6

I noticed Comcast and Google are early adopters on the public side.

[Scott Morris]

The link was in reply to the one BEFORE yours. MAC-address stuff where he/she referenced the 0 and 1 backwards for LAA (U/L) stuff.
The stuff BELOW the link was in response to your post.

Sorry for the confusion!


Scott

[NtwrkAnkS]

Its given like that in the CCNP BSCI book .. i can post the paragraph including a diagram showing just that , but would i be breaking the copright law by doing that??
I also checked this on packetlife.net and even Jeremy is saying what you are saying, so i guess the BSCI book is actually wrong

btw, i am a he


Ankur

[Scott Morris]

It would not break copyright as long as you attribute the quote. There's fair-use clauses in copyright law that apply just fine. (long sordid history there!)
But yeah, they messed up.
Good to know that Jeremy agrees with me though! Or I with him! heheheh.


Scott