Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 425
Link Bundle Monitoring, Transmission, Media, MTU Range in bytes
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Link Dampening Support for XML View the output of the following show commands in XML by adding | display xml to the end of the command. • show interfaces dampening • show interfaces dampening summary • show interfaces interface slot/port Configure MTU Size on an Interface In Dell EMC Networking OS, Maximum Transmission Unit (MTU) is defined as the entire Ethernet packet (Ethernet header + FCS + payload). The link MTU is the frame size of a packet, and the IP MTU size is used for IP fragmentation. If the system determines that the IP packet must be fragmented as it leaves the interface, Dell EMC Networking OS divides the packet into fragments no bigger than the size set in the ip mtu command. NOTE: Because different networking vendors define MTU differently, check their documentation when planning MTU sizes across a network. The following table lists the range for each transmission media. Transmission Media Ethernet MTU Range (in bytes) 594-12000 = link MTU 576-9234 = IP MTU Link Bundle Monitoring Monitoring linked LAG bundles allows traffic distribution amounts in a link to be monitored for unfair distribution at any given time. A threshold of 60% is defined as an acceptable amount of traffic on a member link. Links are monitored in 15-second intervals for three consecutive instances. Any deviation within that time sends Syslog and an alarm event generates. When the deviation clears, another Syslog sends and a clear alarm event generates. The link bundle utilization is calculated as the total bandwidth of all links divided by the total bytes-per-second of all links. If you enable monitoring, the utilization calculation is performed when the utilization of the link-bundle (not a link within a bundle) exceeds 60%. To enable and view link bundle monitoring, use the following commands. • Enable link bundle monitoring. ecmp-group • View all LAG link bundles being monitored. show running-config ecmp-group • Enable link bundle monitoring on port channel interfaces. link-bundle-monitor enable DellEMC(conf-if-po-10)#link-bundle-monitor enable • Configure threshold level for link bundle monitoring. Interfaces 425
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