I believe that a 'Y' (or X or Z for that matter) designation on an IOS release indicates that it was purposefully branched off the main release train in order to support a specific feature and/or bugfix. That branch can go through several iterations before the test code is integrated back into the next release of the main train. It basically gives the IOS developers a way quickly release something w/o impacting the entire train.
For example, I know there's a 12.4.11T-XJ release that has a wireless feature I've been waiting ages for. That feature is ONLY in that XJ release, but should be officially released in 12.4.12T (or whatever the next major release is.) I'll put that release on non-critical and/or test-lab routers, and mess around with it until it gets 'officially' released.
If you don't have a TAC engineer telling you to use a such a release (e.g. because it solves whatever problem you're having) then stick with a either the ED (Early Deployment) or GD (General Deployment) release.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...