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7.8.1.0 - Force10 Networks

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Figure 232<br />

Clearing Dampening Counters<br />

<strong>Force10</strong># clear dampening interface Gi 0/1<br />

<strong>Force10</strong># show interfaces dampening GigabitEthernet0/0<br />

InterfaceState Flaps Penalty Half-LifeReuse SuppressMax-Sup<br />

Gi 0/1 Up 0 0 20 500 1500 300<br />

Link Dampening Support for XML<br />

View the output of the following show commands in XML by adding | display xml to the end of the<br />

command:<br />

• show interfaces dampening<br />

• show interfaces dampening summary<br />

• show interfaces interface x/y<br />

Configure MTU size on an Interface<br />

The E-Series supports a link Maximum Transmission Unit (MTU) of 9252 bytes and maximum IP MTU of<br />

9234 bytes. The link MTU is the frame size of a packet, and the IP MTU size is used for IP fragmentation.<br />

If the system determines that the IP packet must be fragmented as it leaves the interface, FTOS divides the<br />

packet into fragments no bigger than the size set in the ip mtu command.<br />

In FTOS, MTU is defined as the entire Ethernet packet (Ethernet header + FCS + payload)<br />

Since different networking vendors define MTU differently, check their documentation when planing<br />

MTU sizes across a network.<br />

Table 29 lists the range for each transmission media.<br />

Table 29 MTU Range<br />

Transmission Media MTU Range (in bytes)<br />

Ethernet 594-9252 = link MTU<br />

576-9234 = IP MTU<br />

Ethernet Pause Frames<br />

Ethernet Pause Frames is supported on platforms c e s<br />

Threshold Settings are supported only on platforms: c s<br />

Ethernet Pause Frames allow for a temporary stop in data transmission. A situation may arise where a<br />

sending device may transmit data faster than a destination device can accept it. The destination sends a<br />

PAUSE frame back to the source, stopping the sender’s transmission for a period of time.<br />

376 Interfaces

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