HP Surestore 64 Planning Guide - Page 95

Duplicate domain IDs, E_Port segmentation

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A rerouting delay parameter can be enabled by the Product Manager application that ensures the director guarantees correct frame order delivery. The delay period is equal to the error detect time out value (E_D_TOV) specified in the Product Manager application. Class 2 frames transmitted into the fabric during this delay period are rejected; Class 3 frames are discarded without notification. The rerouting delay parameter can also be enabled through the Product Manager application. Note To prevent E_Port segmentation, the same E_D_TOV and resource allocation time out value (R_A_TOV) must be specified for each director. • E_Port segmentation When an ISL activates, the two directors exchange operating parameters to determine if they are compatible and can join to form a single fabric. If the directors are incompatible, the connecting E_Port at each director segments to prevent the creation of a single fabric. A segmented link transmits only Class F traffic; the link does not transmit Class 2 or Class 3 traffic. The following conditions cause E_Ports to segment: - Incompatible operating parameters Either the R_A_TOV or E_D_TOV is inconsistent between the two directors. - Duplicate domain IDs One or more domain ID conflicts are detected. - Incompatible zoning configurations Zoning configurations for the directors are not compatible. For an explanation, refer to (Zoning configurations for joined fabrics on p. 82). - Build fabric protocol error A protocol error is detected during the process of forming the fabric. - No principal switch No director in the fabric is capable of becoming the principal switch. Planning Considerations Multiswitch Fabric Support 81

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Multiswitch Fabric Support
81
Planning Considerations
A rerouting delay parameter can be enabled by the Product Manager application that
ensures the director guarantees correct frame order delivery. The delay period is equal
to the error detect time out value (E_D_TOV) specified in the Product Manager
application. Class 2 frames transmitted into the fabric during this delay period are
rejected; Class 3 frames are discarded without notification. The rerouting delay
parameter can also be enabled through the Product Manager application.
Note
To prevent E_Port segmentation, the same E_D_TOV and resource allocation
time out value (R_A_TOV) must be specified for each director.
•
E_Port segmentation
When an ISL activates, the two directors exchange operating parameters to determine
if they are compatible and can join to form a single fabric. If the directors are
incompatible, the connecting E_Port at each director segments to prevent the creation
of a single fabric. A segmented link transmits only Class F traffic; the link does not
transmit Class 2 or Class 3 traffic. The following conditions cause E_Ports to segment:
–
Incompatible operating parameters
Either the R_A_TOV or E_D_TOV is inconsistent between the two directors.
–
Duplicate domain IDs
One or more domain ID conflicts are detected.
–
Incompatible zoning configurations
Zoning configurations for the directors are not compatible. For an explanation,
refer to (
Zoning configurations for joined fabrics
on p. 82).
–
Build fabric protocol error
A protocol error is detected during the process of forming the fabric.
–
No principal switch
No director in the fabric is capable of becoming the principal switch.