Cisco Nexus 7000 Series - Page 75

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Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 3 Configuring IPv6
Information About IPv6
Figure 3-10 IPv6 Extension Header Format
Table 3-3 lists the extension header types and their Next Header field values.
IPv6 base header
Table 3-3 IPv6 Extension Header Types
Header Type
Next Header
Value Description
Hop-by-hop options header 0 Header that is processed by all hops in the path of a
packet. When present, the hop-by-hop options header
always follows immediately after the basic IPv6
packet header.
Destination options header 60 Header that can follow any hop-by-hop options
header. The header is processed at the final destination
and at each visited address specified by a routing
header. Alternatively, the destination options header
can follow any Encapsulating Security Payload (ESP)
header. The destination options header is processed
only at the final destination.
Routing header 43 Header that is used for source routing.
Fragment header 44 Header that is used when a source fragments a packet
that is larger than the Maximum Transmission Unit
(MTU) for the path between itself and a destination.
The Fragment header is used in each fragmented
packet.
Upper-layer headers 6 (TCP)
17 (UDP)
Headers that are used inside a packet to transport the
data. The two main transport protocols are TCP and
UDP.