408 | Interfacesw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Figure 19-31. Clearing Dampening CountersLink Dampening Support for XMLView the output of the following show commands in XML by adding | display xml to the end of thecommand:• show interfaces dampening• show interfaces dampening summary• show interfaces interface x/yConfigure MTU size on an InterfaceThe Z9000 supports a link Maximum Transmission Unit (MTU) of 12000 bytes and maximum IP MTU of9234 bytes. 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, FTOS divides thepacket into fragments no bigger than the size set in the ip mtu command.In FTOS, MTU is defined as the entire Ethernet packet (Ethernet header + FCS + payload)Since different networking vendors define MTU differently, check their documentation when planingMTU sizes across a network.Table 19-6 lists the range for each transmission media.Ethernet Pause FramesEthernet Pause Frames is supported on platforms c e s zThreshold Settings are supported only on platforms: c s zEthernet Pause Frames allow for a temporary stop in data transmission. A situation may arise where asending device may transmit data faster than a destination device can accept it. The destination sends aPAUSE frame back to the source, stopping the sender’s transmission for a period of time.Table 19-6. MTU RangeTransmission Media MTU Range (in bytes)Ethernet 594-12000 = link MTU576-9234 = IP MTUFTOS# clear dampening interface Gi 0/1FTOS# show interfaces dampening GigabitEthernet0/0InterfaceState Flaps Penalty Half-LifeReuse SuppressMax-SupGi 0/1 Up 0 0 20 500 1500 300
