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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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B-1. IP Protocol Numbers

A higher-layer protocol is identified with an 8-bit field within an IPv4 packet called Protocol. The IPv4 header format is shown in Figure B-1 with the Protocol field shaded. Figure B-2 shows the IPv6 header format where the protocol number is stored in the shaded Next Header field.

Figure B-1. IPv4 Header Format Showing the Protocol Field

Figure B-2. IPv6 Base Header Format Showing the Next Header Field

Well-known or assigned IP protocols are registered with the Internet Assigned Numbers Authority (IANA). The information ...

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