Avaya Configuring Ethernet, FDDI, and Token Ring Services Manuel d'utilisateur télécharger pdf (Page 48)

Configuring Ethernet, FDDI, and Token Ring Services

3-12 117020-A Rev. A

Editing FDDI Path Attributes

FDDI nodes exchange frames using the Timed-Token Protocol (TTP). The TTP

deﬁnes how the target token rotation time (TTRT) is set, the length of time a node

can hold the token, and how a node initializes the ring.

Each node is responsible for monitoring the integrity of the ring. By using a

minimum valid transmission time (TVX), nodes can detect a break in ring activity.

If the interval between token receptions exceeds the value of the TVX, the node

reports an error condition and initiates the claim process to restore ring operation.

The TTRT carried in claim frames issued by the FDDI station are known as path

attributes. F

igure 3-6 illustrates their relationship.

Figure 3-6. Range of Values for FDDI Path Attributes

To edit the path attributes for a FDDI line:

1. Click on Expert at the Edit FDDI Parameters window (refer to

igure 3-1).

The FDDI Advanced Attributes window appears (refer to F

igure 3-2).

2. Click on Path Attributes.

The FDDI Path Attributes window appears (F

igure 3-7).

0 ms 2.5 ms 1336.9344 ms

TVX

lower

bound

T_Max lower bound

Requested TTRT

LS0015A

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Avaya Configuring Ethernet, FDDI, and Token Ring Services Manuel d'utilisateur Page 48