Administrator Guide

• Enter the disable and no disable commands in Hypervisor Configuration mode, for a specified
type of hypervisor connection. The discovery process resumes on all enabled ports.
• An update arrives from a hypervisor. The discovery process resumes on all VSN-enabled ports.
In order for a switch to learn VLAN information from a hypervisor:
• Incoming traffic must be received on the VSN-enabled ports.
• There must be at least one VMAC configured on the hypervisor so that the VCAP table can capture
the VMAC entries for each VSN-enabled port.
The following log messages display when the discovery process is interrupted and when it starts again:
Nov 28 11:34:19: %STKUNIT0-M:CP %VSNMGR-5-VSN_DISCOVERY_SUSPENDED:
Hypervisor macs not seen on Te 0/25. Discovery suspended.
Nov 28 11:40:36: %STKUNIT0-M:CP %VSNMGR-5-VSN_DISCOVERY_RESUMED: Detected
config change in Hypervisor. Discovery of Hypervisor macs resumed on Te 0/25.
Connectivity
If a network server is not reachable, a log message displays and the VSN agent tries periodically to
establish the connection with the hypervisor.
The initial log message is:
Xen-Citrix:Connection error for hypervisor testing:LOGIN FAILURE
If connectivity to a hypervisor is lost after information is retrieved and used to reconfigure a switch, the
following log message displays. The VSN agent tries to connect to the hypervisor in the background. The
information that was retrieved from the hypervisor is not deleted.
Xen-Citrix:Lost connection to hypervisor xen217. Retrying...
Afterward, one of the following actions performs:
• If connectivity with the hypervisor is re-established within three minutes after the loss of connectivity,
the following log message displays and the retrieved information is retained:
Xen-Citrix:Reestablished connection with hypervisor xen217.
• If connectivity with the hypervisor is not re-established within three minutes after the loss of
connectivity, the following log message displays. The information retrieved from the hypervisor is
deleted and the VLANs from the hypervisor are unconfigured:
Xen-Citrix:Lost connection to hypervisor xen217. Removing learnt
information.
Running VSN Scripts
The VSN package contains the SDKs for VMware and Citrix Xen hypervisors.
The Perl and Python scripts required for VSN functionality are stored with the VSN package in
the /usr/pkg/scripts/VSNAgent directory as follows:
• For VMware hypervisors, the Perl script is stored is at /usr/pkg/scripts/VSNAgent/VMWare/
VSNAgent.pl
.
• For Citrix Xen hypervisors, the Python script is stored is at /usr/pkg/scripts/VSNAgent/Xen/
hpAgtMain.py
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Virtual Server Networking