Cisco Catalyst 2000 Configuration Handbook page 293

Catalyst series lan switching
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272 Cisco LAN Switching Configuration Handbook
0
Version
Time to live
Figure B-1 IPv4 Header Format Showing the Protocol Field
0
Version
Traffic Class
Payload Length
Figure B-2 IPv6 Base Header Format Showing the Next Header Field
Table B-1 shows the registered IP protocol numbers, along with the protocol keyword (or
acronym), the name of the protocol, and an RFC number (if applicable).
Table B-1 Registered IP Protocol Numbers, Keywords, Names, and Associated RFCs
Keyword Protocol References
HOPOPT
IPv6 Hop-by-Hop Option
RFC 1883
ICMP
Internet Control Message
RFC 792
IGMP
Internet Group Management
RFC 1112
GGP
Gateway-to-Gateway
RFC 823
IP
IP in IP (encapsulation)
RFC 2003
1
Hdr len
Service type
Identification
Protocol
Destination IP address
IP options (if needed)
1
Source Address
Destination Address
2
Flags
Source IP address
Data ...
2
Flow Label
Next Header
"
"
"
"
"
"
Number
0
1
2
3
4
3
Total length
Fragment offset
Header checksum
Padding
3
Hop Limit

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