Users Guide

Table Of Contents
Table 152. UFD on VLT network
Event VLT action on primary node VLT action on secondary
node
UFD action
VLTi Link is operationally up
with heartbeat up
No action VLT module sends VLT port-
channel enable request to
Interface Manager (IFM) for
both uplink and downlink.
UFD receives operationally
up of upstream VLT port-
channel and sends clear error-
disable of downstream VLT
port-channel to IFM.
Reboot of VLT secondary
peer
No action After reboot, runs the delay
restore timer. Both the
upstream and downstream
VLT port-channel remains
disabled until the timer
expires.
UFD error-disables
the downstream VLT port-
channel as the upstream VLT
port-channel is operationally
down. After the timer expires,
UFD receives operationally up
of upstream VLT port-channel
and sends clear error-
disable of downstream VLT
port-channel to IFM.
Reboot of VLT primary peer Primary becomes secondary
peer and runs delay restore
timer
Secondary becomes primary UFD error-disables
the downstream VLT port-
channel as the upstream VLT
port-channel is operationally
down. After the timer expires,
UFD receives operationally up
of upstream VLT port-channel
and sends clear error-
disable of downstream VLT
port-channel to IFM.
Discovery interface added to
UFD group
Invalid configuration Invalid configuration Invalid configuration
UFD group member
configured as discovery
interface
Invalid configuration Invalid configuration Invalid configuration
UFD group member made as
VLT port-channel
No action No action UFD uses fabric status to
track the UFD group status.
VLT port-channel added as
member of UFD group
No action No action UFD uses fabric status to
track the UFD group status.
VLT port-channel
configuration removed from
the port-channel interface
which is upstream member of
UFD group
No action No action Stops tracking the fabric
status for the UFD group.
Starts tracking the local port-
channel operational status,
which is upstream member of
the UFD group.
Fabric Status is operationally
up
No action No action Enables the downstream
members, that is clears the
error-disabled state.
Fabric Status is operationally
down
No action No action Disables the downstream
members, that is sets the
error-disabled state.
Uplink Failure Detection 1667