3143d86b69
Updates for patchset 2 review comments Changed link depth of main Planning index and added some narrative guidance Added planning/openstack as sibling of planning/kubernetes Related additions to abbrevs.txt Added max-workers substitution to accomodate StarlingX/vendor variants Signed-off-by: Ron Stone <ronald.stone@windriver.com> Change-Id: Ibff9af74ab3f2c00958eff0e33c91465f1dab6b4 Signed-off-by: Stone <ronald.stone@windriver.com>
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44 lines
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.. acc1552590687558
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.. _the-ethernet-mtu:
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============
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Ethernet MTU
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============
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The |MTU| of an Ethernet frame is a configurable attribute in |prod|. Changing
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its default size must be done in coordination with other network elements on
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the Ethernet link.
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In the context of |prod|, the |MTU| refers to the largest possible payload on
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the Ethernet frame on a particular network link. The payload is enclosed by the
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Ethernet header \(14 bytes\) and the CRC \(4 bytes\), resulting in an Ethernet
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frame that is 18 bytes longer than the |MTU| size.
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The original IEEE 802.3 specification defines a valid standard Ethernet frame
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size to be from 64 to 1518 bytes, accommodating payloads ranging in size from
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46 to 1500 bytes. Ethernet frames with a payload larger than 1500 bytes are
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considered to be jumbo frames.
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For a |VLAN| network, the frame also includes a 4-byte |VLAN| ID header,
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resulting in a frame size 22 bytes longer than the |MTU| size.
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In |prod|, you can configure the |MTU| size for the following interfaces and
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networks:
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.. _the-ethernet-mtu-ul-qmn-yvn-m4:
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- The management, cluster host and |OAM| network interfaces on the
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controller. The |MTU| size for these interfaces is set during initial
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installation.
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.. xbooklink For more information, see the `StarlingX Installation and Deployment Guide <https://docs.starlingx.io/deploy_install_guides/index.html>`__. To make changes after installation, see |sysconf-doc|: :ref:`Change the MTU of an OAM Interface Using Horizon <changing-the-mtu-of-an-oam-interface-using-horizon>`.
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- Additional interfaces configured for container workload connectivity to
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external networks,
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In all cases, the default |MTU| size is 1500. The minimum value is 576, and the
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maximum is 9216.
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