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IPv6
Agenda
IPng Protocols & Standards
IPv6 Integration & Co-Existence
Cisco IOS IPv6 roadmap
IPv6 Deployment
IPv6 – So What’s Really Changed?
Version
IHL
Type of Service
Total Length
Identification
Flags
Fragment Offset
Time to Live
Protocol
Header Checksum
Source Address
Destination Address
Options
Padding
Version
Traffic Class
Flow Label
Payload Length
Next Header
Hop Limit
Source Address
Destination Address
Defined by RFC 2460
Address length quadrupled to 16 bytes
Fixed length
(Optional headers daisy chained)
No checksumming
(Done by Link Layer)
No hop-by-hop segmentation
(Path MTU discovery)
Flow label/class
(Integrated QoS support)
Concatenated extension headers…
IPv4 Header
IPv6 Header
IPv6 Main Features/Functionality
Expanded Address Space
Header Format Simplification
Auto-configuration and Multi-Homing
Mobile IP without triangular routing
Class of Service/Multimedia support
Authentication and Privacy Capabilities
No more broadcast Multicast
IPv4 IPv6 Transition Strategy
IPv6 Addressing
IPv6 Addressing rules are covered by multiples RFC’s
Architecture defined by RFC 2373
Address Types are :
Unicast : One to One (Global, Link local, Site local, Compatible)
Anycast : One to Nearest (Allocated from Unicast)
Multicast : One to Many
Reserved
A single interface may be assigned multiple IPv6 addresses of any type (unicast, anycast, multicast)
No Broadcast Address -> Use Multicast
IPv6 Addressing
Prefix Format (PF) Allocation
PF = 0000 0000 : Reserved
PF = 0000 001 : Reserved for OSI NSAP Allocation (see RFC 1888)
PF = 0000 010 : Was reserved for IPX Allocation (no use)
PF = 001 : Aggregatable Global Unicast Address
PF = 1111 1110 10 : Link Local Use Addresses
PF = 1111 1110 11 : Site Local Use Addresses
PF = 1111 1111 : Multicast Addresses
Other values are currently Unassigned (approx. 7/8th of total)
All Prefix Formats have to have EUI-64 bits Interface ID
But Multicast
Text Representation of IPv6 Addresses
“preferre