Cisco Catalyst 4948 User Manual

Appendix B
Well-known Protocol,
Port, and Other Numbers
Refer to the following sections for explanations and listings of well-known numbers:
■ B-1: IP Protocol Numbers
■ B-2: ICMP Type and Code Numbers
■ B-3: Well-known IP Port Numbers
■ B-4: Well-Known IP Multicast Addresses
■ B-5: Ethernet Type Codes
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.
Well-known or assigned IP protocols are registered with the Internet Assigned Numbers
Authority (IANA). The information presented here is reproduced with permission from
the IANA. For the most current IP protocol number assignment information, refer to
www.iana.org/numbers.htm under the “Protocol Numbers” link.

Cisco Catalyst 4948 Specifications

General

Switching Capacity	136 Gbps
Forwarding Rate	102 Mpps
Rack Units	1U
MAC Address Table Size	32, 000 entries
Authentication Method	RADIUS, TACACS+
RAM	256 MB
Flash Memory	64 MB
Power Device	Internal power supply
Voltage Required	100-240 VAC
Weight	16.5 lbs
Operating Humidity	10% to 85% non-condensing
Ports	48 x 10/100/1000
Power Supply	Internal
Layer Support	Layer 3
Jumbo Frame Support	Yes (up to 9216 bytes)
Routing Protocol	RIP, OSPF, EIGRP, BGP
Remote Management Protocol	SNMP, Telnet, SSH
Features	VLAN support, QoS
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.1Q, IEEE 802.1p
Operating Temperature	32 °F to 104 °F (0 °C to 40 °C)