Important Points; Link Debounce Timer; Important Points To Remember About Link Debounce Timer - Dell Force10 Z9000 Configuration Manual

Important Points

• Splitting a 40G port into 4x10G port is supported only on a standalone unit.
• Split ports cannot be used as stack-link to stack an Z9000.
• Split ports cannot be a part of any stacked system.
• The unit number with the split ports must be the default (stack-unit 0)
This can be verified using
renumbered to 0 before ports are split, by using the
• The quad port must be in a default configuration before it can be split into 4x10G ports. The 40G port
is lost in the config when the port is split, so be sure the port is also removed from other L2/L3 feature
configurations.
• The system must be reloaded after issuing the CLI for the change to take effect.

Link Debounce Timer

Link Debounce Timer
The Link Debounce Timer feature isolates upper layer protocols on Ethernet switches and routers from
very short-term, possibly repetitive interface flaps often caused by network jitter on the DWDM equipment
connecting the switch and other devices on a SONET ring. The Link Debounce Timer delays link change
notifications, thus decreasing traffic loss due to network configuration. All interfaces have a built-in timer
to manage traffic. This feature extends the time allowed by the upper layers.
The SONET ring has its own restore time whenever there is a failure. During this time, however,
the Ethernet interface connected to the switch will flap. Link Debounce Timer instructs the
Ethernet switch to delay the notification of the link change to the upper layers. If the link state
changes again within this period, no notification goes to the upper layers, so that the switch
remains unaware of the change.
Note: Enabling the link debounce timer causes link up and link down detections to be delayed, resulting in
traffic being blackholed during the debouncing period. This situation might affect the convergence and
reconvergence of some Layer 2 and Layer 3 protocols.

Important Points to Remember about Link Debounce Timer

• Link Debounce Timer is configurable on physical ports only.
• Only 1G fiber, 10/100/1000 copper, 10G fiber, 10G copper are supported.
• This feature is not supported on management interfaces or SONET interfaces.
• Link Debounce takes effect only when the operational state of the port is up.
• Link Debounce is supported on interfaces that also have link dampening configured.
• Unlike link dampening, link debounce timer does not notify other protocols.
| Interfaces
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command. If the unit ID is different than 0, then it must be
show system brief
is supported on platform
stackunit id renumber 0
e
command in EXEC mode.