Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)

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For more information on configuring interoperability for Cisco Nexus 5000 Series switches, see the Cisco

MDS 9000 Family Switch-to-Switch Interoperability Configuration Guide

Note

About Interop Mode

Cisco NX-OS software supports the following four interop modes:

• Mode 1— Standards-based interop mode that requires all other vendors in the fabric to be in interop

mode.

• Mode 2—Brocade native mode (Core PID 0).

• Mode 3—Brocade native mode (Core PID 1).

• Mode 4—McData native mode.

For information about configuring interop modes 2, 3, and 4, see the Cisco MDS 9000 Family Switch-to-Switch

Interoperability Configuration Guide, available at the following location:

http://www.cisco.com/en/US/docs/storage/san_switches/mds9000/interoperability/guide/intopgd.html

The following table lists the changes in switch operation when you enable interoperability mode. These

changes are specific to Cisco Nexus 5000 Series switches while in interop mode.

Table 87: Changes in Switch Operation When Interoperability Is Enabled

Changes if Interoperability Is EnabledSwitch Feature

Some vendors cannot use the full range of 239

domains within a fabric.

Domain IDs

Domain IDs are restricted to the range 97 to 127, to

accommodate McData’s nominal restriction to this

same range. Domain IDs can either be static or

preferred, which operate as follows:

• Static: Cisco switches accept only one domain

ID; if a switch does not get that domain ID it

isolates itself from the fabric.

• Preferred: If the switch does not get its

requested domain ID, it accepts any assigned

domain ID.

All Fibre Channel timers must be the same on all

switches as these values are exchanged by E ports

Timers

when establishing an ISL. The timers are F_S_TOV,

D_S_TOV, E_D_TOV, and R_A_TOV.

Verify that the Fabric Stability Time Out Value timers

match exactly.

F_S_TOV

Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

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Advanced Fibre Channel Features and Concepts

About Interop Mode