HP Integrity Virtual Machines 4.3: Installation, Configuration, Administration

2 Reserved avio_lan none 1 none
3 Active avio_lan none 1 u03 none
To enable the VLAN-backed vswitch (VBVsw) feature, HP-UX PHNE_40215 or a superseding
patch is required on the VM Host. This patch is available as an individual patch or as part of
"FEATURE11i" bundle. To verify that the patch is installed, enter the following:
# swlist -l product | grep PHNE_40215
PHNE_40215 1.0 LAN cumulative patch
The dlpi_max_ub_promisc kernel tunable needs to be set to when using a VBVsw type vswitch.
Otherwise, attempting to boot the vswitch fails with the following error message from the
hpvmnet command:
# hpvmnet -b -S vs5000
hpvmnetd: setup_downlink: promisc failed, recv_ack:
promisc_phys: UNIX error - Device busy, errno 5
To set the kernel tunable, enter the following:
# kctune dlpi_max_ub_promisc=
NOTE: AVIO LAN drivers on OpenVMS guests are VLAN tag-unaware and support the
vswitch-based VLAN configuration. Use the following command to configure VLAN for an
OpenVMS guest:
# hpvmnet -S vswitch-name -u portid:portnum:vlanid:vlandid
7.4.4 Configuring VLANs on Physical Switches
When communicating with a remote VM Host or guest over the network, you might need to
configure VLANs on the physical switches. The physical switch ports that are used must be
configured specifically to allow the relevant VLANs. If the remote host is VLAN aware, You
must configure VLAN interfaces on the host for the relevant VLANs. Use thelanadmin command
to configure VLANs on a remote HP-UX host. For example, to configure a VLAN interface with
VLAN ID 100 on lan4, enter the following command:
# lanadmin -V create vlanid 100 4
Successfully configured
lan5000: vlanid 100 name UNNAMED pri 0 tos 0 tos_override IP_HEADER pri_override CONF_PRI ppa 4
7.5 Troubleshooting Network Problems
This section describes some commonly encountered problems using virtual networks.
• Do not kill hpvmnetd
Do not use the kill command to remove the hpvmnetd process. If you do, the following
error message indicates that the hpvmnet daemon has been killed:
hpvmnetd: Switch 0000564d4c414e31 already exists
If the hpvmnetd process is removed, vswitches do not work properly.
• TCP Segmentation Offload (TSO) is turned off by default in HP-UX. HP recommends that
you leave it turned off on both the VM Host system and on HP-UX guests if you are using
the VIO interface. This applies to both the virtual network interface cards in the guest and
any physical network interface cards in the VM Host that are used by vswitches. When TSO
is enabled, guest networks are interrupted.
Note that this restriction applies to VIO interfaces.
138 Creating Virtual Networks