IBM Cloud: Power Systems Virtual Serverでjumbo frameを有効にする

- UIで作成するとJumbo Frameは有効にならない
- CLI/APIで作成すると、Jumbo Frameを有効にする指定が可能になる。
- CLIではJumbo Frameが有効になったかどうかは確認できない。しかしAPIでは確認できるので、CLIのデバッグオプションを使えば`jumbo`の値がtrue/flaseになっているかで確認できる。



```txt:jumbo frameオプションを指定しなかった場合
$ ibmcloud pi network-create-private test1 --cidr-block 192.168.10.0/24 --ip-range "192.168.10.2-192.168.10.254" --gateway 192.168.10.1
Creating network test1 under account xxx as user xxxxxx@xx.xxx.xxx...
Network test1 created.

ID           c21e6b24-3365-4926-bc37-2276d42b74ab
Name         test1
Type         vlan
VLAN         905
CIDR Block   192.168.10.0/24
IP Range     [192.168.10.2   192.168.10.254 ]
Gateway      192.168.10.1
DNS          -

$ ibmcloud pi network test1
Creating network test1 under account xxx as user xxxxxx@xx.xxx.xxx...

ID           c21e6b24-3365-4926-bc37-2276d42b74ab
Name         test1
Type         vlan
VLAN         905
CIDR Block   192.168.10.0/24
IP Range     [192.168.10.2   192.168.10.254 ]
Gateway      192.168.10.1
DNS          -

$ IBMCLOUD_TRACE=true ibmcloud pi network test1 2>&1 | grep cidr|jq
{
  "cidr": "192.168.10.0/24",
  "dnsServers": [],
  "gateway": "192.168.10.1",
  "ipAddressMetrics": {
    "available": 253,
    "total": 253,
    "used": 0,
    "utilization": 0
  },
  "ipAddressRanges": [
    {
      "endingIPAddress": "192.168.10.254",
      "startingIPAddress": "192.168.10.2"
    }
  ],
  "jumbo": false,
  "name": "test1",
  "networkID": "c21e6b24-3365-4926-bc37-2276d42b74ab",
  "type": "vlan",
  "vlanID": 905
}
```

```txt:jumbo frameオプションを指定しなかった場合
$ ibmcloud pi network-create-private test1-jumbo --cidr-block 192.168.20.0/24 --ip-range "192.168.20.2-192.168.20.253" --gateway 192.168.20.254 --jumbo
Creating network test1-jumbo under account xxx as user xxxxxx@xx.xxx.xxx...
Network test1-jumbo created.

ID           31b4d0e4-a259-47bf-bf4e-35b65c8f5805
Name         test1-jumbo
Type         vlan
VLAN         906
CIDR Block   192.168.20.0/24
IP Range     [192.168.20.2   192.168.20.253 ]
Gateway      192.168.20.254
DNS          -

$ ibmcloud pi network test1
Creating network test1-jumbo under account xxx as user xxxxxx@xx.xxx.xxx...

ID           c21e6b24-3365-4926-bc37-2276d42b74ab
Name         test1
Type         vlan
VLAN         905
CIDR Block   192.168.10.0/24
IP Range     [192.168.10.2   192.168.10.254 ]
Gateway      192.168.10.1
DNS          -


$ ibmcloud pi network test1-jumbo
Getting Network test1-jumbo under account IBM as user shiyasu@jp.ibm.com...

ID           31b4d0e4-a259-47bf-bf4e-35b65c8f5805
Name         test1-jumbo
Type         vlan
VLAN         906
CIDR Block   192.168.20.0/24
IP Range     [192.168.20.2   192.168.20.253 ]
Gateway      192.168.20.254
DNS          -

$ IBMCLOUD_TRACE=true ibmcloud pi network test1-jumbo 2>&1 | grep cidr|jq
{
  "cidr": "192.168.20.0/24",
  "dnsServers": [],
  "gateway": "192.168.20.254",
  "ipAddressMetrics": {
    "available": 252,
    "total": 252,
    "used": 0,
    "utilization": 0
  },
  "ipAddressRanges": [
    {
      "endingIPAddress": "192.168.20.253",
      "startingIPAddress": "192.168.20.2"
    }
  ],
  "jumbo": true,
  "name": "test1-jumbo",
  "networkID": "31b4d0e4-a259-47bf-bf4e-35b65c8f5805",
  "type": "vlan",
  "vlanID": 906
}
```