AppendixG

Setting Address Prefixes to Match Hierarchical PNNI

Algorithm for Automatic Setting of ATM Prefixes

1Identify a pre-assigned prefix, possibly given by an ATM Service Provider. If none, use our factory prefix 39.00.00.00.00.00.00.00.00.00.00.00.00

2List switches that exist in the network.

3The user identifies the highest level (L) for the hierarchy.

—The level range is 1-104. It is recommended to use the range 8-96

—The recommended value should be a multiple of eight.

4For all switches set the L/8 left-most bytes to be the same as those bytes in the pre-assigned prefix.

5Select a group of switches that will be in the same level peer group, start from the higher level peer group (lower number), and go down the hierarchy (higher numbers).

6Determine at which level this peer group should reside and make this level L1.

—Never select a level that is higher (lower in number) than a level that was previously selected.

7For all the switches in a peer group (L1), set an unused level-index (1-255) to the (L1)/8 byte and mark this index “used”.

8Determine whether this is the lowest level. If so, set to each one of the switches in the peer group an unused index for the next byte and mark this index ‘used”.

9Repeat steps 5-8 until the user decides that the process ends.

10At this point, all bytes up to the 13th are set to 0.

Example:

1The pre-assigned prefix is 39.00.00.00.00.00.00.00.00.00.00.00.00

2Here is the list of switches: A, B, C, D, E, F, G

3The highest level of the hierarchy (user input): 40

4The first five (40/8) bytes of all prefixes will be: 39.00.00.00.00

5The user selects switches: A,B,C,D to be together at level 48.

6Assign the sixth (48/8=6) byte to be 1, mark the index 1 for byte six “used”.

—The prefix for switches A,B,C,D so far is: 39.00.00.00.00.01

7The user selects switches A,B to be together at level 56

8Assign the 7 byte to be 1, mark the index 1 for byte seven “used”. The prefix for switches A,B is: 39.00.00.00.00.01.01

9The user says it is the lowest level for switch A,B

—Assign the next byte (8) to the switches in the peer group.

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Avaya M770 Setting Address Prefixes to Match Hierarchical Pnni, Algorithm for Automatic Setting of ATM Prefixes, Example
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M770 specifications

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