From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Feb 07 2005 - 17:34:18 GMT-3
Thanks Jongsoo. Please see in-line comments.
----- Original Message -----
From: <Jongsoo.Kim@Intelsat.com>
To: <ccie2be@nyc.rr.com>; <ccielab@groupstudy.com>
Sent: Monday, February 07, 2005 1:36 PM
Subject: RE: ipv6 eui-64 and link-local
> Tim
>
> Here is my answer as I am studying Ipv6 as well.
>
> I think ipv6 address fec0:157:1:14::/64 = ipv6 address fec0:157:1:14::0/64
> SO if you <CR>, then fec0:157:1:14::0/64 is your IPV6 site local address.
***************
Does this mean that the low order 64 bits are 0? And, if so, doesn't ipv6
automaticially use eui-64
to do things like find neighbor's link layer address? And, if not, doesn't
that mean we have to always use eui-64?
>
> EUI-64 is based on 24 bits of MAC address + FFFE + 24bit of Mac ADDRESS.
> So if MAC is 0000.0C0A.2C51, then EUI is 0000.0C + FF.FE + 0A.2C51.
> Final IPv6 address will be fec0:157:1:14:0000:0CFF:FE0A:2C51
>
> Link local address is very important when Ipv6 routing protocol is
running.
> It is better to manually configure because it's easy to remember.
> For example, if you running IPv6 OSPF over frame-relay and you have to
> configure frame-relay map,
> you must configure something like " frame-realy map ipv6
link-local-address
> DLCI broadcast".
> In this case, you want to use very easy link-local address such as
"FE80::1"
>
>
> Regards
>
>
> Jongsoo
>
>
>
> -----Original Message-----
> From: ccie2be [mailto:ccie2be@nyc.rr.com]
> Sent: Monday, 07 February, 2005 8:21 AM
> To: Group Study
> Subject: ipv6 eui-64 and link-local
>
>
> HI guys,
>
> I'm very unclear about when I need to use the eui-64 or link-local options
> when configuring an ipv6 address.
>
> For example, what's the difference between the following 2 options?
>
>
> Rack1R1(config-if)#ipv6 address fec0:157:1:14::/64 ?
> eui-64 Use eui-64 interface identifier
> <cr>
>
> If I just hit enter <cr>, what will be the value of the low 64 bit's?
>
> Also, regarding the link local option, I understand that ipv6 will
> automatically generate a link-local address from the site local or the
> aggregatable global unicast address. So, why would I ever want to
override
> the auto generated link-local address?
>
> Thanks for your help. I'm really struggling with this ipv6 stuff.
>
> Tim
>
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