HP Integrity Virtual Machines Version 4.2 Release Notes

localnet 21 Up Shared N/A N/A
vmlan0 22 Up Shared lan0 0x00306ea72c0d 15.13.114.205
vmlan4 23 Up Shared lan4 0x00127942fce3 192.1.2.205
vmlan900 24 Up Shared lan900 0x00306e39815a 192.1.4.205
Check the status of the transmit CKO using the following command:
# lanadmin -x cko 4
Hardware TCP/UDP (IPv4) transmit checksum offload is currently enabled.
Hardware TCP/UDP (IPv4) receive checksum offload is currently disabled.
In this example, the VLANs are configured over the vswitch vmlan4. This vswitch is created on
PPA 4 on the VM Host. To turn off CKO on PPA 4, enter the following command on the VM
Host:
# lanadmin -X send_cko_off 4
Hardware TCP/UDP (IPv4) transmit checksum offload is currently disabled.
7.2.15 Configuring vswitches to be Backed by a VLAN Interface on the VM Host is
Not Supported
Do not use the hpvmnet command to create a virtual switch backed by a VLAN port on the VM
Host. This configuration is not supported.
7.2.16 Do Not Turn on TSO on the VM Host and on HP-UX Guests When Using VIO
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.
To verify whether TSO is turned on, enter the following command:
# lanadmin -x vmtu n
Where n is the VM Host interface, as displayed by the hpvmnet command. For example, to verify
that TSO is on for lan0, enter the following command:
# lanadmin -x vmtu 0
Driver/Hardware supports TCP Segmentation Offload, Current VMTU = 32160
To turn TSO off on lan0, use the following command:
# lanadmin -X vmtu 0 0
Virtual MTU is set to 0
Note that this restriction applies only to VIO interfaces.
7.2.17 Restarting Vswitches
It is necessary to restart the vswitch when:
• You replace the physical network card associated with the vswitch.
• You change a VM Host IP address associated with the vswitch's network interface card.
• You change the network interface characteristics on the VM Host; for example, by using the
lanadmin command to change checksum offloading (CKO).
• You notice that there is no communication from an avio_lan interface to a lan interface
after booting the guest(s) while the vswitch is down.
For information about how to restart vswitches, see the HP Integrity Virtual Machines 4.2:
Installation, Configuration, and Administration manual.
When you restart a vswitch, it is not necessary to restart the guests using the vswitch.
72 Networking Information