Cisco Catalyst 2000 Configuration Handbook page 294

Table B-1 Registered IP Protocol Numbers, Keywords, Names, and Associated RFCs
Keyword Protocol References
ST
Stream
RFC 1190, RFC 1819
TCP
Transmission Control
RFC 793
CBT
CBT
EGP
Exterior Gateway Protocol
RFC 888
IGP
Any private interior gateway
IANA (used by Cisco for IGRP)
BBN-RCC-MON
BBN RCC Monitoring
NVP-II
Network Voice Protocol
RFC 741
PUP
PUP
ARGUS
ARGUS
EMCON
EMCON
XNET
Cross Net Debugger
CHAOS
Chaos
UDP
User Datagram
RFC 768
MUX
Multiplexing
DCN-MEAS
DCN Measurement Subsystems
Appendix B: Well-known Protocol, Port, and Other Numbers 273
Number
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19