User`s guide

228 Implementing an Open IBM SAN
To enable a particular device, use the same menu and click Enable as shown in
Figure 3-47.
Figure 3-47 IN-VSN: Enabling and Disabling Loop devices
You should have at least one device per port left that is Not in Bypass. By default,
all attached loop devices are set to Not in Bypass.
Differences between private loop and public loop
There are two kinds of Arbitrated Loop protocols: private loop and public loop.
For both kinds of loop ports, you have to enable the director ports to be able to
use them as we have described previously.
However, there are some important differences between private loop and public
loop, as discussed in the following topics.
Note: Not all loop devices support Bypass. In such cases, even after clicking
the Disable button, they will remain in Not in Bypass mode. That means such
devices are always enabled.