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How can we change global MTU or Layer2 interface MTU?

Created: May 29, 2020 14:07:42Latest reply: Jun 2, 2020 11:54:21 761 7 0 0 0
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As I checked we cannot change Layer2 MTU size in Huawei switches (S6700). There is solution only to change MTU size after change the interface to L3.Is it possible to change MTU size globally in switches or any other solution to change MTU size.

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Popeye_Wang
Admin Created May 31, 2020 03:52:58

Hi,
MTU(maximum transmission unit) refers to the size of a Layer 3 IP packet.
To control the size of Layer 2 frames on an interface, run the jumboframe enable command.
For details, please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100101074&id=EN-US_CLIREF_0177114416&lang=en
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Recommended answer

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chenhui
Admin Created May 29, 2020 14:16:45

Hi,
You can use command mtu under the interface view to modify the MTU value. Please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100037168&id=mtu_ap-system-profile_view&lang=en

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2#
chenhui
chenhui Admin Created May 29, 2020 14:16:45

Hi,
You can use command mtu under the interface view to modify the MTU value. Please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100037168&id=mtu_ap-system-profile_view&lang=en

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3#
wissal
wissal MVE Created May 29, 2020 14:23:08

Hello,

Huawei, Cisco, and Ericsson (Redback) devices use the IP MTU as the MTU on their Ethernet ports, and other vendors use the Layer 2 MTU (IP MTU + Layer 2 header or CRC). The following table lists the MTUs of common product models.

No.

Device   vendor

Device   Type

Interface   Type

MTU Value   Description

Default   Value

1

cisco

CRS-1

Ethernet

IP MTU+14

1514

2

cisco

C7600

Ethernet

IP MTU

1500

2

juniper

M/T series

Ethernet

IP MTU+14

1514

3

juniper

ERX/E320

Ethernet

IP MTU+18

1518

4

Huawei

NE40E/80E

Ethernet

IP MTU

1500

5

ALU

7750SR

Ethernet

IP MTU+14

1514

6

redback

SE800

Ethernet

IP MTU

1500

I hope my answer will help you.

Thanks



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4#
Sapte
Sapte Created May 29, 2020 18:08:38

Hi,

MTU can be configured for the below views doesn't support system-view on S6720,


mtu (protocol view) such as mpls mtu

mtu (Interface view)

<HUAWEI> system-view

[HUAWEI] interface gigabitethernet 0/0/1

[HUAWEI-GigabitEthernet0/0/1] undo portswitch

[HUAWEI-GigabitEthernet0/0/1] mtu 1200

[HUAWEI-GigabitEthernet0/0/1] restart

mtu (VSI view)

<HUAWEI> system-view

[HUAWEI] vsi company1 static

[HUAWEI-vsi-company1] pwsignal ldp

[HUAWEI-vsi-company1-ldp] vsi-id 100

[HUAWEI-vsi-company1-ldp] quit

[HUAWEI-vsi-company1] mtu 1600


mtu (MTI view)

<HUAWEI> system-view

[HUAWEI] interface mtunnel 10

[HUAWEI-MTunnel10] mtu 1400


Have a nice day

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5#
Popeye_Wang
Popeye_Wang Admin Created May 31, 2020 03:52:58

Hi,
MTU(maximum transmission unit) refers to the size of a Layer 3 IP packet.
To control the size of Layer 2 frames on an interface, run the jumboframe enable command.
For details, please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100101074&id=EN-US_CLIREF_0177114416&lang=en
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6#
tolga
tolga Created Jun 1, 2020 06:10:47

Posted by Popeye_Wang at 2020-05-31 03:52 Hi,MTU(maximum transmission unit) refers to the size of a Layer 3 IP packet.To control the size of L ...
Hi,

It solves my problem. I realized that jumboframe is already enabled in default interface configuration as 9216 bytes.

Thanks a lot. :)
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7#
anneper
anneper Created Jun 2, 2020 11:54:13

thank you for your sharing 
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8#
anneper
anneper Created Jun 2, 2020 11:54:21

Great knowldge!!!
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