Fabric OS Troubleshooting and Diagnostics Guide v7.0.0 (53-1002150-02, June 2011)

Fabric OS Troubleshooting and Diagnostics Guide 109

53-1002150-02

Appendix

Hexadecimal

Hexadecimal overview

Hexadecimal, also known as hex, is a numeral system with a base of 16, usually written using

unique symbols 0–9 and A–F, or a–f. Its primary purpose is to represent the binary code that

computers interpret in a format easier for humans to remember. It acts as a form of shorthand, in

which one hexadecimal digit takes the place of four binary bits. For example, the decimal numeral

79, with the binary representation of 01001111, is 4F (or 4f) in hexadecimal where 4 = 0100, and

F = 1111.

Hexadecimal numbers can have either an 0x prefix or an h suffix. The address 0xFFFFFA is the

same address as FFFFFAh.This type of address with 6 digits representing 3 bytes, is called a hex

triplet. Fibre Channel uses hexadecimal notation in hex triplets to specify well-known addresses

and port IDs.

Example of hexadecimal triplet conversion

Notice the PID in the nsshow output is in hexadecimal, shown in blue in the following example.

Switch:admin> nsshow

{

Type Pid COS PortName NodeName TTL(sec)

N 610600; 2,3;10:00:00:00:c9:29:b3:84;20:00:00:00:c9:29:b3:84; na

FC4s: FCP

NodeSymb: [36] "Emulex LP9002 FV3.90A7 DV5-5.10A10 "

Fabric Port Name: 20:08:00:05:1e:01:23:e0

Permanent Port Name: 10:00:00:00:c9:29:b3:84

Port Index: 6

Share Area: No

Device Shared in Other AD: No

Redirect: No

The Local Name Server has 1 entry }

1. Separate the triplets: 61 06 00

2. Convert each hexadecimal value to a decimal representation, using Table 24:

61 = Domain ID = 97

06 = Area (port number) = 06

00 = Port (AL_PA) = 0 (not used in this instance, but is used in loop, NPIV, and Access Gateway

devices)

Result: hexadecimal triplet 610600 = decimal triplet 97,06,00