408 | Interfaces
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Figure 19-31. Clearing Dampening Counters
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 x/y
Configure MTU size on an Interface
The Z9000 supports a link Maximum Transmission Unit (MTU) of 12000 bytes and maximum IP MTU of
9234 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 the
packet 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 planing
MTU sizes across a network.
Table 19-6 lists the range for each transmission media.
Ethernet Pause Frames
Ethernet Pause Frames is supported on platforms c e s z
Threshold Settings are supported only on platforms: c s z
Ethernet Pause Frames allow for a temporary stop in data transmission. A situation may arise where a
sending device may transmit data faster than a destination device can accept it. The destination sends a
PAUSE frame back to the source, stopping the sender’s transmission for a period of time.
Table 19-6. MTU Range
Transmission Media MTU Range (in bytes)
Ethernet 594-12000 = link MTU
576-9234 = IP MTU
FTOS# clear dampening interface Gi 0/1
FTOS# show interfaces dampening GigabitEthernet0/0
InterfaceState Flaps Penalty Half-LifeReuse SuppressMax-Sup
Gi 0/1 Up 0 0 20 500 1500 300
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