Enable Jumbo MTUs on Preconfigured PVIs and Public Network

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Enable Jumbo MTUs on Preconfigured PVIs and Public Network

When you enable jumbo MTUs on the PVIs and public networks that are already configured, you must first delete all the existing PVIs and public networks and then enable the jumbo MTUs. You must then recreate all the PVIs and public networks that were configured earlier.

Note - This MTU is supported in fabrics exclusively running Oracle EDR hardware. You might experience issues if you use a combination of Oracle hardware and other vendor's hardware in Oracle EDR fabrics.

Display all the configured PVIs and public network.

show system info
hostname                            ovn87-195
descr
domain                              us.oracle.com
address                             10.129.87.195
netmask                             255.255.255.0
model-num                           Oracle Fabric Interconnect IS2-46
serial-num                          Not Specified
ipconfig                            static
default-gateway                     10.129.87.1
mtu                                 1500
support-jumbo-packet                true
timezone                            GMT
console-speed                       115200

For PVIs, use the command show pvi *
For public network, use the command show public-network

Gather information about all the existing PVIs and public networks.
```
show pvi VNICs
show public-network VNICs
```
Make sure that you note the PVI and VNIC names, the hosts on which the PVIs or VNICs are terminated on, and the other information that you might need to recreate PVI and public networks.
Delete the existing configuration.
Verify whether you are running PSIF 1.0.0 or later and Oracle Fabric OS 1.0.1 or later.
```
show physical-server server-name
show version
```
Note - Jumbo MTUs are supported only on PSIF 1.0.0 or later.

Verify whether the HCA is capable of jumbo MTU.

# cat /proc/driver/xve/devices/vnic_test/vnic_test |grep -i eoib
Eoib: yes

# cat /proc/driver/xve/devices/vnic_test |grep -i titan
Titan: yes

If the value of the eoib and titan is yes, the HCA is capable of jumbo MTU.

Enable jumbo MTU on PVI and public network.
set system jumbo-packet true

Display the MTU that has taken effect.

# cat /proc/driver/xve/devices/vnic_test/vnic_test |grep -i mtu
mtu:                                9000
Admin mtu:                          9000

Recreate the PVIs and public networks by providing the correct MTU size.
Note - See Supported MTU Sizes, then select a value that is appropriate to the MTU size in use in your IB network.
Verify the MTU size on public cloud.
```
# show public-network pub_net_name
```
Display the system version of the virtualization switch.
```
# show system version
```
Check the MTU size on the host.
```
# ifconfig
```