Service Manual

• If one of the upstream interfaces in an uplink-state group goes down, either a user-congurable 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-disabled downstream
ports (which were previously disabled due to this upstream port going down) is brought up and the UFD Disabled error is
cleared.
• If you disable an uplink-state group, the downstream interfaces are not disabled regardless of the state of the upstream
interfaces.
– If an uplink-state group has no upstream interfaces assigned, you cannot disable downstream interfaces when an upstream
link goes down.
• To enable the debug messages for events related to a specied uplink-state group or all groups, use the debug uplink-
state-group [group-id] command, where the group-id is from 1 to 16.
– To turn o debugging event messages, use the no debug uplink-state-group [group-id] command.
– For an example of debug log message, refer to Clearing a UFD-Disabled Interface.
Conguring Uplink Failure Detection
To congure UFD, use the following commands.
1. Create an uplink-state group and enable the tracking of upstream links on the switch/router.
CONFIGURATION mode
uplink-state-group group-id
• group-id: values are from 1 to 16.
To delete an uplink-state group, use the no uplink-state-group group-id command.
2. Assign a port or port-channel to the uplink-state group as an upstream or downstream interface.
UPLINK-STATE-GROUP mode
{upstream | downstream} interface
For interface, enter one of the following interface types:
• 1 Gigabit Ethernet: enter gigabitethernet {slot/port | slot/port-range}
• 10 Gigabit Ethernet: enter tengigabitethernet {slot/port | slot/port-range}
• For a port channel interface, enter the keywords port-channel then a number.
Where port-range and port-channel-range specify a range of ports separated by a dash (-) and/or individual ports/
port channels in any order; for example:
upstream gigabitethernet 1/1-2,5,9,11-12
downstream port-channel 1-3,5
• A comma is required to separate each port and port-range entry.
To delete an interface from the group, use the no {upstream | downstream} interface command.
3. Congure the number of downstream links in the uplink-state group that will be disabled (Oper Down state) if one upstream link
in the group goes down.
UPLINK-STATE-GROUP mode
downstream disable links {number | all}
• number: species the number of downstream links to be brought down. The range is from 1 to 1024.
• all: brings down all downstream links in the group.
The default is no downstream links are disabled when an upstream link goes down.
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Uplink Failure Detection (UFD)