Each network node is assigned a Network Services Access Point (NSAP) address that is stored in the SYSCTL. This address is used by the IS-IS routing protocol. This address can be configured to group nodes into different logical areas within a network domain.
The Network Services Access Point (NSAP) address is composed of 20 octets. These 20 octets can be represented by 40 hexadecimal characters. The 20 octet-space of the NSAP address is used store values for the 9 fields that compose the NSAP.
The following table displays the 9 fields of the NSAP, and the number of octets used by each field.
|
NSAP Field: |
AFI |
IDI |
DFI |
Organization ID |
RES |
RD |
Area |
System Identifier |
SEL |
|---|---|---|---|---|---|---|---|---|---|
|
Octets: |
1 |
2 |
1 |
3 |
2 |
2 |
2 |
6 |
1 |
|
Default Value: (hex) |
39 |
840F |
80 |
000000 |
0000 |
0000 |
0000 |
none |
00 |
|
not provisionable |
user provisionable |
not provisionable | |||||||
The first 4 octets of the Alcatel-Lucent 1850 TSS-5 NSAP address are always the same and cannot be changed. The next 9 octets of the NSAP address are provisionable. The last 7 octets contain the System Identifier field, which is unique to each node, and the Selector (SEL) field.
The Area field consists of two octets, that can be represented by four hexadecimal characters. It has a default value of 0000 (hex). The Area field can be provisioned to assign a node to a specific area. TL1 command ENT-ULSDCC-L3 can be used to change the Area field.
Multiple area addressing is the capability of assigning more than one area address to a node. Multiple area addresses are not supported for Alcatel-Lucent 1850 TSS-5. However, if multiple area addresses are provisioned in another node, Alcatel-Lucent 1850 TSS-5 will recognize its own primary area address plus up to two other area addresses. The use of multiple area addresses is not recommended.
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