What is default MTU for ONT, MDU, ONU, OLT?

Created: Dec 2, 2019 02:43:44Latest reply: Dec 3, 2019 00:38:31 227 4 0 0
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Hi, what are the default MTU for huawei OLT, ONT, MDU? Please advise, thanks in advance. 

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GongXiaochuan
Created Dec 3, 2019 00:38:31 Helpful(1) Helpful(1)

hi, ONT MTU=2000 MDU,OLT MTU=1500, OLT can set the MTU value by command , refer to below

https://support.huawei.com/hedex/hdx.do?docid=EDOC1000171625&id=GUID2BCE9B8B-65E6-468A-9757-5E1C99F408E5&lang=en
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sohaib.ansar
sohaib.ansar MVE Created Dec 2, 2019 04:24:24 Helpful(0) Helpful(0)

Hi peter,
MTU for ONT  for L2 and L3.
The Layer 2 MTU of an ONT is fixed - 2000 bytes and the Layer 3 MTU can be configured and queried on the WAN port.
For an IPoE WAN port -  the default MTU is 1500 bytes and for a PPPoE WAN port - the default MTU is 1492 bytes.

For more details  please see the below email.

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Iqra%20University%3Cbr%2F%3EMBA%20IT%3Cbr%2F%3EFootball%3Cbr%2F%3EIP%20Technician%3Cbr%2F%3EHelping%20hand%20for%20others.
wissal
wissal MVE Created Dec 2, 2019 05:18:28 Helpful(0) Helpful(0)

Hello,
By default, the MTU of an Ethernet interface is 1500 bytes
When ONT is in bridge mode, the Layer 2 MTU of the ONT is 2000 bytes.
When ONT is in route mode, you can set the Layer 3 MTU on the WAN Configuration page. The default Layer 3 MTU is 1500 bytes for IPoE WAN and is 1492 bytes for PPPoE WAN.
Rference :https://forum.huawei.com/enterprise/en/q-a-what-is-the-mtu-of-ont/thread/456413-100181
Thanks
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Peter2019
Peter2019 Created Dec 2, 2019 12:14:00 Helpful(0) Helpful(0)

Thanks both of you for your kind reply. The default MTU of ONT is 2000byte, does it cause the packet dropped at upstream
core switch if the host/server sends out a large data segment 1800 byte with DF bit set?
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GongXiaochuan
GongXiaochuan Created Dec 3, 2019 00:38:31 Helpful(1) Helpful(1)

hi, ONT MTU=2000 MDU,OLT MTU=1500, OLT can set the MTU value by command , refer to below

https://support.huawei.com/hedex/hdx.do?docid=EDOC1000171625&id=GUID2BCE9B8B-65E6-468A-9757-5E1C99F408E5&lang=en
  • x
  • convention:

Good Good Study Day Day Up

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