Table Of Contents
MDS 9000 Legacy Switch Interop Mode 4
Specifications
VSAN World Wide Name
Domain and FC IDs
Configuration
MDS 9000 Legacy Switch Interop Mode 4
This chapter covers legacy switch interop mode 4 for connecting MDS9000 switches to McData switches running in McData Fabric 1.0 mode. It includes the following sections:
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Specifications
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Configuration
Specifications
Legacy switch interoperability mode 4, introduced in Cisco SAN-OS Release 3.0(1), provides the means to non-disruptively connect a McData switch running in McData Fabric 1.0 mode with an MDS 9000 switch.
While in this mode, the MDS VSAN emulates the behavior of a McData switch, including the use of offsets when referring to domain IDs and FC IDs, and in its ability to only establish an Inter-Switch Link (ISL) with another switch that uses McData's OUI (08:00:88).
Note
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If an MDS 9000 switch is using IVR to provide access between McData connected devices and devices in other VSANs, all zoning should be done from the MDS switch.
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Cisco Fabric Manager running Cisco MDS SAN-OS Release 3.0(1) or higher must be used to manage fabrics containing interop mode 4 VSANs.
VSAN World Wide Name
A VSAN running in interop mode 4 must be configured to use a WWN that follows a specific set of rules regarding the following format:
2y:yy:08:00:88:zz:zz:zz
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Mandatory: The first byte must begin with 2.
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Mandatory: y = 0:00 or hex representation of the VSAN number. (For example, 0:0a for VSAN 10.)
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Mandatory: 3rd, 4th and 5th bytes of the WWN must be 08:00:88 (McData OUI).
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Recommended: z = last three bytes of the switch WWN.
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Mandatory: The chosen WWN must be unique across the fabric.
Note
Because the WWN has a McData OUI, the WWN can conflict only with McData switches or other MDS switches with VSANs running in interop mode 4.
Tip
The easiest method to obtain a WWN that meets these conditions is to use the system assigned Local switch WWN and replace the OUI. Notice that 0xbc0 is 3008 in decimal.
switch# show fcdomain vsan 3008
The local switch is the Principal Switch.
Local switch run time information:
Local switch WWN: 2b:c0:00:0c:85:e9:d2:c1
Running fabric name: 2b:c0:00:0c:85:e9:d2:c1
Current domain ID: 0x0a(10)
The VSAN WWN cannot be configured unless the VSAN is in a suspended state. Set the WWN using the following command:
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# wwn vsan <VSAN #> vsan-wwn <wwn>
Domain and FC IDs
A McData switch refers to domain IDs in the range of 1 to 31, while FC IDs are used within the range 97 to 127, with an offset of 96. The interop mode 4 VSAN emulates the same behavior as the McData switch. Therefore, when configuring static domain IDs on an MDS switch, the range 1 to 31 should be used; however, devices that log into the VSAN (even physically located on the MDS switch) receive an FC ID whose domain ID is 97-127.
Note
If a static domain ID is configured on the MDS switch, it must be in the range 1 to 31 for the interop mode 4 VSAN. However, persistent FC IDs must be configured in the range 97 to 127.
For example, in the following output, a device in VSAN 3008 is assigned an FC ID that contains domain ID 0x6a (106), but upon examining the domain-list, domain ID 10 is displayed. McData's offset of 96 is the difference between the device's FC ID and the domain ID within the domain-list.
switch# show flogi database vsan 3008
---------------------------------------------------------------------------
INTERFACE VSAN FCID PORT NAME NODE NAME
---------------------------------------------------------------------------
fc2/5 3008 0x6a0000 50:06:0e:80:04:27:e0:46 50:06:0e:80:04:27:e0:46
Total number of flogi = 1.
switch# show fcdomain domain-list vsan 3008
--------- -----------------------
0x06(6) 10:00:08:00:88:a0:ee:f7 [Principal]
0x0a(10) 2b:c0:08:00:88:e9:d2:c1 [Local]
Note
If IVR-1 is configured, the domain that is in non-interop mode 4 must have a domain ID in the range 97 to 127 because IVR-1 does not modify the domain ID or FC ID unlike, IVR-2 (NAT).
No modifications to the McData switch are required to connect to the MDS switch. A short procedure is required on the MDS switch prior to establishing the ISL. Cisco Fabric Manager running Cisco SAN-OS Release 3.0(1) or higher should be used to manage an MDS based fabric that contains an interop mode 4 VSAN.
Configuration
To establish connectivity between the McData switch and an MDS switch, follow these steps:
Step 1
Create the VSAN.
Enter configuration commands, one per line. End with CNTL/Z.
switch(config)# vsan database
switch(config-vsan-db)# vsan 3008
Step 2
Record the Local switch WWN:
switch(config-vsan-db)# do show fcdomain vsan 3008
The local switch is the Principal Switch.
Local switch run time information:
Local switch WWN: 2b:c0:00:0c:85:e9:d2:c1
Running fabric name: 2b:c0:00:0c:85:e9:d2:c1
Current domain ID: 0x0a(10)
Step 3
Suspend the VSAN.
switch(config-vsan-db)# vsan 3008 suspend
Step 4
Configure interop mode 4 for the VSAN.
switch(config-vsan-db)# vsan 3008 interop 4
Step 5
Configure the VSAN WWN for the VSAN according to the rules specified in VSAN World Wide Name.
switch(config-vsan-db)# do show wwn switch
Switch WWN is 20:00:00:0c:85:e9:d2:c0
switch(config-vsan-db)# wwn vsan 3008 vsan-wwn 2b:c0:08:00:88:e9:d2:c1
Step 6
Unsuspend the VSAN.
switch(config)# vsan database
switch(config-vsan-db)# no vsan 3008 suspend
Step 7
Add the ISL to the VSAN and verify connectivity.
switch# show fcdomain domain-list vsan 3008
--------- -----------------------
0x06(6) 10:00:08:00:88:a0:ee:f7 [Principal]
0x0a(10) 2b:c0:08:00:88:e9:d2:c1 [Local]
switch# show topology vsan 3008
FC Topology for VSAN 3008 :
--------------------------------------------------------------------
Interface Peer Domain Peer Interface Peer IP Address
--------------------------------------------------------------------
fc2/15 0x06(6) Port 63 ::
Figure 9-1 show how the McData GUI displays the MDS switch and the domain IDs of 6 and 10.
Figure 9-1 McData GUI Displaying an MDS Switch in Interop Mode 4
At this point, devices within the VSAN can be zoned using either the Cisco SAN-OS command-line interface, Cisco Fabric Manager, or the McData GUI.