Communications Network Router User Manual

Address and Device Mapping
A-3
Loop ID to AL_PA Mapping
During the Fibre Channel Arbitrated Loop (FC-AL) initialization process, a unique
Arbitrated Loop Physical Address (AL_PA) value is assigned to each port on the loop. Not
all of the 256 hex values are allowed as AL_PA values per FC-AL, so Loop IDs are used
to represent the 125 addresses that the router can use. You can assign a Loop ID to the
router. See Changing the Router’s Loop ID on page 3-8.
Table A-2 shows how a Loop ID value maps to an AL_PA. If you set the Loop ID to SOFT,
the router attempts to obtain an available Loop ID, in the following order: 0, 1, 2, etc.
Table A-2. Arbitrated loop physical addresses
Loop ID
(decimal)
AL_PA
(hex)
Loop ID
(decimal)
AL_PA
(hex)
Loop ID
(decimal)
AL_PA
(hex)
0EF 19CA 38AA
1E8 20C9 39A9
2E4 21C7 40A7
3E2 22C6 41A6
4E1 23C5 42A5
5E0 24C3 43A3
6DC 25BC 449F
7DA 26BA 459E
8D9 27B9 469D
9 D6 28B6 479B
10 D5 29 B5 48 98
11 D4 30 B4 49 97
12 D3 31 B3 50 90
13 D2 32 B2 51 8F
14 D1 33 B1 52 88
15 CE 34 AE 53 84
16 CD 35 AD 54 82
17 CC 36 AC 55 81
18 CB 37 AB 56 80
57 7C 80 55 103 31
58 7A 81 54 104 2E
59 79 82 53 105 2D
60 76 83 52 106 2C
61 75 84 51 107 2B