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[Enterprise SONiC] MTU (Maximum Transmission Unit) Follow

andyyl_chen 陳英倫

February 02, 2024 03:10
Updated

Tested model & firmware version:

Switch model name:

AS7326-56X

Edgecore SONiC version:

202006.4

202012.2

202111.0 ~ 202111.8

Restriction:

Known issue:
- It does not return failed if configure over-limit MTU size by SONIC-CLI, and the container will crash.(After 202012.2, we add the error handling for MTU configuration on SONIC-CLI.)

e.g: configure MTU 16000 on the interface.

admin@sonic:~$ show interface status Ethernet0
  Interface    Lanes    Speed    MTU    FEC          Alias    Vlan    Oper    Admin            Type    Asym PFC
-----------  -------  -------  -----  -----  -------------  ------  ------  -------  --------------  ----------
  Ethernet0        1      10G  16000   none  Eth1/1(Port1)  routed      up       up SFP/SFP+/SFP28         N/A

Default setting:
- MTU is 9100 by default
- MTU range is 1500 to 9216.
Currently modifying VLAN's MTU is unsupported; changing interface's MTU may disrupt VLAN-based sessions (e.g., MC-LAG).
After 202111.6 support VLAN's MTU

admin@sonic:~$ sudo config vlan mtu 10 8000
admin@sonic:~$ show vlan br --mtu
+-----------+------------+------------+------------+
|   VLAN ID |   VLAN MTU | Ports      |   Port MTU |
+===========+============+============+============+
|        10 |       8000 | Ethernet10 |       8000 |
+-----------+------------+------------+------------+

Procedure :

Step 1. Configure MTU 4000 on Ethernet0.

Example: MTU of Ethernet0 is 4000

admin@sonic:~$ sudo config interface mtu Ethernet0 4000

Step 2. Save the configuration to config_db.json

admin@sonic:~$ sudo config save -y

Step 3. Check MTU parameter

by SONiC show command.

admin@sonic:~$ show interfaces status Ethernet0
  Interface    Lanes    Speed    MTU    Oper FEC        Alias    Vlan    Oper    Admin    ProtoDown    Eff Admin    Type    Asym PFC    Oper Speed
-----------  -------  -------  -----  ----------  -----------  ------  ------  -------  -----------  -----------  ------  ----------  ------------
  Ethernet0        1      10G   4000        none  Eth1(Port1)  routed    down       up        False           up     N/A         N/A           10G

MTU with PortChannel

Edgecore SONiC version:

202111.2 ~ 202111.8

Restriction:

Known issue:
Before the 202111.2 version, the PortChannel can not configure MTU by sonic command

Procedure :

Step 1. Configure MTU 4000 on PortChannel01.

Example: MTU of PortChannel01 is 4000

admin@sonic:~$ sudo config interface mtu PortChannel01 4000

Step 2. Save the configuration to config_db.json

admin@sonic:~$ sudo config save -y

Step 3. Check MTU parameter

by SONiC show command.

admin@sonic:~$ show inter status PortChannel01
    Interface    Lanes    Speed    MTU    Oper FEC    Alias    Vlan    Oper    Admin    ProtoDown    Eff Admin    Type    Asym PFC    Oper Speed
-------------  -------  -------  -----  ----------  -------  ------  ------  -------  -----------  -----------  ------  ----------  ------------
PortChannel01      N/A      10G   4000         N/A      N/A  routed    down       up        False           up     N/A         N/A           10G

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Category

[Enterprise SONiC] MTU (Maximum Transmission Unit) Follow

Tested model & firmware version:

Restriction:

Procedure :

MTU with PortChannel

Restriction:

Procedure :

Comments

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Edgecore Networks Corporation

END USER LICENSE AGREEMENT

1) Trademarks:

2) License grant:

3) Open Source Software:

4) Ownership and Copyright:

5) Unauthorized Use:

6) No Warranties:

7) Limited Liability:

8) Compliance with laws:

9) Termination:

10) Governing Law and Jurisdiction:

11) General:

Category

Tested model & firmware version:

Restriction:

Procedure :

MTU with PortChannel

Restriction:

Procedure :

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