From: Scott Morris (swm@emanon.com)
Date: Tue Aug 19 2008 - 11:33:32 ART
Which forum are you sending the message to? I have not seen your message at
all...
Knowing which lab would help too, but let's try generic answers...
1. EUI-64 forces the router to assign the host portion of the IPv6 address
based on the MAC address (or based on the link-local ipv6 address defined).
It's merely a shortcut to providing all 128 bits of address to the router
and save yourself some typing (partcularly when it comes to MAC addresses!)
Whether you use it or not is completely your own decision unless the lab
specifically tells you otherwise.
2. If you just use one, will you have full reachability? Try "debug ipv6
packet" and do some pings. Try some pings THROUGH the interface as well
once routing is working.
3. Summarization in IPv6 works EXACTLY like it does n IPv4. At least at a
binary level. It's just bigger and uglier.
So to summarize, we break it in binary as you did. And with those
numbers/binary, you appear to be correct that it should be a /59. If I knew
what lab we were talking about I could really better answer it or figure out
if there were different requirements in addition to those two numbers!
HTH,
Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
Senior CCIE Instructor
smorris@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344
Online Community: Not allowed to post, but you know where to find it!
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Knowledge is power.
Power corrupts.
Study hard and be Eeeeviiiil......
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Nitro Drops
Sent: Tuesday, August 19, 2008 3:20 AM
To: ccielab@groupstudy.com
Subject: IEWB - IPv6 Queries
Hi Folks,
Need some kind advices from network experts, have tried the IE forum, but no
replies.
Q1. Task 6.1 : IPv6 "eui-64"
When configuring IPv6 addresses on the interfaces, when do i need to include
IPv6 host address "eui-64"?
2001:192:10:X::/64 eui-64
In R1, "eui-64" is used on the F0/0 interface. But not on R2's F0/0 and R5's
E0/1. Is "eui-64" needed only when I need to carry out a static frame-relay
map statement?
Q2. Task 6.2 : Frame-Relay map statement on R2 Instead of using 2 x
Frame-Relay map statements, one for the IPv6
/64 Network and one for the Link Local /64Host, can i just use 1 x
Frame-Relay map statement for an /128 IPv6 Network + Host instead
frame-relay map ipv6 FE80::204:27FF:FEB5:2F60 201 frame-relay map ipv6
2001:141:1:12::1 201 broadcast into frame-relay map ipv6
2001:141:1:12:204:27FF:FEB5:2F60 201 broadcast
Q3. Task 6.3 : Summarize IPv6 address
Is the summarized mask supposed to be /59 instead of /58?
2 characters = 1 byte = 8 bits
2001:141:1:12 = 2001 (16bits) : 0141 (16bits) : 0001 (16bits) : 0012
(00000000 0000 1100)
2001:141:1:25 = 2001 (16bits) : 0141 (16bits) : 0001 (16bits) : 0025
(00000000 0001 1001) Summarised Masks = 16 + 16 + 16 + 11 = 59 bits? (From
Left to Right) Thanks for any kind replies.
Much appreciated.
Cheers
Nit
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