Reference model:
- Switch model name: AS7326-56X
- Edgecore SONiC version: SONiC.Edgecore-SONiC_20200827_110345_ec201911_2020-aug_enhanced_178
Known issue :
- Port breakout fails if portchannel exists. Please remove portchannel before doing breakout.
- After doing breakout, MTU size of the first interface will be disappeared. Doing config reload after save the configuration will correct the MTU.
- In SONiC.Edgecore-SONiC_20200827_110345_ec201911_2020-aug_enhanced_178 version, dynamic port breakout fails after using default configuration file generated by sonic-cfggen and restore.sh.
Example : Dynamic Port Breakout
Procedure:
Step 1. Check IP interface and portchannel status before doing port breakout. In this example, we may take Ethernet48 to be a breakout port.
Caution: IP address has to be removed from physical interface and VLAN interface. This port has also to be removed from Vlan member. It's now allowed to do port breakout if the switch has portchannel setting.
admin@sonic:~$ show ip interfaces
Interface IPv4 address/mask Admin/Oper
----------- ------------------- ------------
Ethernet48 192.168.1.1/24 up/up
docker0 240.127.1.1/24 up/down
eth0 188.188.98.25/16 up/up
lo 127.0.0.1/8 up/up
10.1.0.1/32
admin@sonic:~$ sudo config interface ip remove Ethernet48 192.168.1.1/24
Since there is IP address on physical interface "Ethernet48", we have to remove IP address from it.
admin@sonic:~$ show vlan brief
+-----------+----------------+------------+----------------+-----------------------+
| VLAN ID | IP Address | Ports | Port Tagging | DHCP Helper Address |
+===========+================+============+================+=======================+
| 100 | 192.168.2.2/24 | Ethernet52 | untagged | | --> Let's take Ethernet52 to be a breakout port
+-----------+----------------+------------+----------------+-----------------------+
admin@sonic:~$ show ip int
Interface IPv4 address/mask Admin/Oper
----------- ------------------- ------------
Vlan100 192.168.2.2/24 up/up
docker0 240.127.1.1/24 up/down
eth0 188.188.98.30/16 up/up
lo 127.0.0.1/8 up/up
10.1.0.1/32
admin@sonic:~$ sudo config interface ip remove Vlan100 192.168.2.2/24
admin@sonic:~$ sudo config vlan member del 100 Ethernet52
Since there is IP address on "Vlan100" interface, we have to remove IP address from it. Don't forget to delete this port from Vlan member. In this Vlan example, remove Ethernet52 from Vlan100.
admin@sonic:~$ show interface portchannel
Flags: A - active, I - inactive, Up - up, Dw - Down, N/A - not available,
S - selected, D - deselected, * - not synced
No. Team Dev Protocol Ports
----- ----------- ----------- ------------
PortChannel LACP(A)(Dw) Ethernet0(D)
admin@sonic:~$ sudo config portchannel del 1
Delete ALL portchannel. This is known issue that portchannel existence may let breakout fail.
Step 2. Check breakout option availability and current breakout mode.
admin@sonic:~$ show interfaces breakout
{
...omitted...
"Ethernet48": {
"index": "49,49,49,49",
"default_brkout_mode": "1x100G[40G]",
"child ports": "Ethernet48",
"breakout_modes": "1x100G[40G], 2x50G, 4x25G, 4x10G", --> Available breakout mode option
"child port speeds": "100G",
"Current Breakout Mode": "1x100G[40G]",
"lanes": "77,78,79,80",
"alias_at_lanes": "Eth49/1, Eth49/2, Eth49/3, Eth49/4"
},
.......omitted...
}
admin@sonic:~$ show interfaces breakout current-mode Ethernet48
+-------------+-------------------------+
| Interface | Current Breakout Mode |
+=============+=========================+
| Ethernet48 | 1x100G[40G] | --> current mode of Ethernet48
+-------------+-------------------------+
Step 3. Configure dynamic port breakout
admin@sonic:~$ sudo config interface breakout Ethernet48 4x25G --> Breakout Ethernet48 from 1x100G to 4x25G
Do you want to Breakout the port, continue? [y/N]: y
Running Breakout Mode : 4x25G
Target Breakout Mode : 1x100G[40G]Ports to be deleted :
{
"Ethernet50": "25000",
"Ethernet51": "25000",
"Ethernet49": "25000",
"Ethernet48": "25000"
}
Ports to be added :
{
"Ethernet48": "100000"
}
After running Logic to limit the impactFinal list of ports to be deleted :
{
"Ethernet50": "25000",
"Ethernet51": "25000",
"Ethernet49": "25000",
"Ethernet48": "25000"
}
Final list of ports to be added :
{
"Ethernet48": "100000"
}
Loaded below Yang Models
['sonic-acl', 'sonic-extension', 'sonic-interface', 'sonic-loopback-interface', 'sonic-port', 'sonic-portchannel', 'sonic-types', 'sonic-vlan']
Note: Below table(s) have no YANG models:
DEVICE_METADATA, FLEX_COUNTER_TABLE, BREAKOUT_CFG, VERSIONS, TELEMETRY,
Below Config can not be verified, It may cause harm to the system
{
"BREAKOUT_CFG": {
"Ethernet48": {
"brkout_mode": "4x25G"
}
}
}
Do you wish to Continue? [y/N]: y
Breakout process got successfully completed.
Please note loaded setting will be lost after system reboot. To preserve setting, run `config save`.
admin@sonic:~$
Step 4. Show breakout current mode status and interface status
admin@sonic:~$ show interfaces breakout current-mode Ethernet48
+-------------+-------------------------+
| Interface | Current Breakout Mode |
+=============+=========================+
| Ethernet48 | 4x25G |
+-------------+-------------------------+
admin@sonic:~$ show interfaces status
Interface Lanes Speed MTU Alias Vlan Oper Admin Type Asym PFC
----------- --------------- ------- ----- ------- ------ ------ ------- ------ ----------
...... omitted
Ethernet48 77 25G N/A Eth49/1 routed up up N/A N/A --> Do config reload after save it to get MTU corrected
Ethernet49 78 25G 9100 Eth49/2 routed up up N/A N/A
Ethernet50 79 25G 9100 Eth49/3 routed up up N/A N/A
Ethernet51 80 25G 9100 Eth49/4 routed up up N/A N/A
...... omitted
Step 5. Save configuration to startup configuration. Please do config reload to get first MTU corrected (Step 4).
admin@sonic:~$ sudo config save -y
Running command: /usr/local/bin/sonic-cfggen -d --print-data > /tmp/configWO5wNK.db
admin@sonic:~$ sudo config reload -y
admin@sonic:~$ show interfaces status
Interface Lanes Speed MTU Alias Vlan Oper Admin Type Asym PFC
----------- --------------- ------- ----- ------- ------ ------ ------- ------ ----------
...... omitted
Ethernet48 77 25G 9100 Eth49/1 routed up up N/A N/A
Ethernet49 78 25G 9100 Eth49/2 routed up up N/A N/A
Ethernet50 79 25G 9100 Eth49/3 routed up up N/A N/A
Ethernet51 80 25G 9100 Eth49/4 routed up up N/A N/A
...... omitted
Step 6. Undo breakout port.
admin@sonic:~$ sudo config interface breakout Ethernet48 1x100G[40G] --> Undo Ethernet48 from 4x25G to 1x100G
Do you want to Breakout the port, continue? [y/N]: y
Running Breakout Mode : 4x25G
Target Breakout Mode : 1x100G[40G]Ports to be deleted :
{
"Ethernet50": "25000",
"Ethernet51": "25000",
"Ethernet49": "25000",
"Ethernet48": "25000"
}
Ports to be added :
{
"Ethernet48": "100000"
}After running Logic to limit the impactFinal list of ports to be deleted :
{
"Ethernet50": "25000",
"Ethernet51": "25000",
"Ethernet49": "25000",
"Ethernet48": "25000"
}
Final list of ports to be added :
{
"Ethernet48": "100000"
}
Loaded below Yang Models
['sonic-acl', 'sonic-extension', 'sonic-interface', 'sonic-loopback-interface', 'sonic-port', 'sonic-portchannel', 'sonic-types', 'sonic-vlan']
Note: Below table(s) have no YANG models:
DEVICE_METADATA, FLEX_COUNTER_TABLE, BREAKOUT_CFG, VERSIONS, TELEMETRY,
Below Config can not be verified, It may cause harm to the system
{
"BREAKOUT_CFG": {
"Ethernet48": {
"brkout_mode": "4x25G"
}
}
}
Do you wish to Continue? [y/N]: y
Breakout process got successfully completed.
Please note loaded setting will be lost after system reboot. To preserve setting, run `config save`.
admin@sonic:~$
Step 7. Show current breakout mode and interface status.
admin@sonic:~$ show interfaces breakout current-mode Ethernet48
+-------------+-------------------------+
| Interface | Current Breakout Mode |
+=============+=========================+
| Ethernet48 | 1x100G[40G] |
+-------------+-------------------------+
admin@sonic:~$ show interfaces status
Interface Lanes Speed MTU Alias Vlan Oper Admin Type Asym PFC
----------- --------------- ------- ----- ------- ------ ------ ------- ------ ----------
...... omitted
Ethernet48 77,78,79,80 100G N/A Eth49/1 routed down up N/A N/A --> Do config reload after save it to get MTU corrected
Ethernet52 85,86,87,88 100G 9100 Eth50/1 routed down up N/A N/A
Ethernet56 93,94,95,96 100G 9100 Eth51/1 routed down up N/A N/A
Ethernet60 97,98,99,100 100G 9100 Eth52/1 routed down up N/A N/A
...... omitted
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