Dell MX9116n EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 297
mtu, negotiation
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mtu Sets the link maximum transmission unit (MTU) frame size for an Ethernet L2 or L3 interface. Syntax Parameters Default Command Mode Usage Information mtu value value - Enter the maximum frame size in bytes, from 1280 to 65535. Maximum frame size for an S3000-ON is 12000, and S4000-ON is 9216. 1532 bytes INTERFACE To return to the default MTU value, use the no mtu command. If an IP packet includes a L2 header, the IP MTU must be at least 32 bytes smaller than the L2 MTU. ● Port-channels ○ All members must have the same link MTU value and the same IP MTU value. ○ The port channel link MTU and IP MTU must be less than or equal to the link MTU and IP MTU values you configure on the channel members. For example, if the members have a link MTU of 2100 and an IP MTU 2000, the port channel's MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU. ● VLANS ○ All members of a VLAN must have the same MTU value. ○ Tagged members must have a link MTU 4 bytes higher than untagged members to account for the packet tag. ○ Ensure that the MTU of VLAN members is greater than or equal to the VLAN MTU. OS10 selects the lowest MTU value configured on the VLAN or VLAN members to be the VLAN MTU. For example, the VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged members with Link MTU of 1518 and IP MTU of 1500. The VLAN's Link MTU cannot be higher than 1518 bytes and its IP MTU cannot be higher than 1500 bytes. Example OS10(conf-if-eth1/1/7)# mtu 3000 Supported Releases 10.2.0E or later negotiation Configures a negotiation mode on an interface. Syntax Parameters negotiation {auto | on | off} auto - Sets the negotiation mode to the default setting. The default setting depends on the media that you use. on - Forces interface negotiation. off - Disables interface negotiation. Defaults Command Mode Usage Information Auto INTERFACE CONFIGURATION Use the show interfaces command to view the interface negotiation status. Both sides of the link must have auto-negotiation enabled or disabled for the link to come up. Use either the negotiation auto command or the no negotiation command to reset the negotiation mode to its default setting. Example OS10(conf-if-eth1/1/50)# negotiation off OS10(conf-if-eth1/1/50)# show configuration Interfaces 297
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