Dell Force10 E300, Configuration Manual

Page: 1088 / 1262

1088 | Uplink Failure Detection (UFD)
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Important Points to Remember
When you configure Uplink Failure Detection, the following conditions apply:
• You can configure up to sixteen uplink-state groups. By default, no uplink-state groups are created.
An uplink-state group is considered to be operationally up if it has at least one upstream interface in
the link-up state.
An uplink-state group is considered to be operationally down if it has no upstream interfaces in the
link-up state. No uplink-state tracking is performed when a group is disabled or in an operationally
down state.
• You can assign physical port or port-channel interfaces to an uplink-state group.
You can assign an interface to only one uplink-state group. Each interface assigned to an uplink-state
group must be configured as either an upstream or downstream interface, but not both.
You can assign individual member ports of a port channel to the group. An uplink-state group can con-
tain either the member ports of a port channel or the port channel itself, but not both.
If you assign a port channel as an upstream interface, the port channel interface enters a link-down
state when the number of port-channel member interfaces in a link-up state drops below the configured
Minimum Number of Members parameter.
• If one of the upstream interfaces in an uplink-state group goes down, either a user-configurable set of
downstream ports or all the downstream ports in the group are put in an operationally down state with
an UFD Disabled error. The order in which downstream ports are disabled is from the lowest
numbered port to the highest.
If one of the upstream interfaces in an uplink-state group that was down comes up, the set of UFD-dis-
abled downstream ports (which were previously disabled due to this upstream port going down) are
brought up and the UFD Disabled error is cleared.
• If an uplink-state group is disabled, the downstream interfaces are not disabled regardless of the state
of the upstream interfaces.
If an uplink-state group has no upstream interfaces assigned, downstream interfaces cannot be disabled
when an upstream link goes down.
• To enable the debug messages for events related to a specified uplink-state group or all groups, enter
the
debug uplink-state-group
[
group-id
] command, where
group-id
is 1 to 16.
To turn off debugging event messages, enter the
no debug uplink-state-group
[
group-id
] command.
For an example of debug log messages, see Message 1 .