Reference Guide

• You cannot assign both a port channel and its members to an uplink-state group, which would make the group inactive. The port
channels and individual ports that are not part of any port channel can coexist as members of an uplink-state group.
• If one of the upstream interfaces in an uplink-state group goes down, you can congure to set the downstream ports in an operationally
down state with an UFD Disabled error status. You can congure the system to disable either a user-congurable set of downstream
ports or all the downstream ports in the group.
• The downstream ports are disabled in an order starting from the lowest numbered port to the highest.
• When an upstream interface in an uplink-state group that was down comes up, the set of UFD-disabled downstream ports that were
down due to that particular upstream interface are brought up, and the UFD Disabled error clears in those downstream ports.
• If you disable an uplink-state group, the downstream interfaces are not disabled, regardless of the state of the upstream interfaces.
• If you do not assign upstream interfaces to an uplink-state group, the downstream interfaces are not disabled.
Uplink failure detection on VLT
When you create uplink-state group in a switch operating in VLT mode, ensure that all the nodes in the VLT setup have same conguration
for uplink state groups with VLT port-channel as member. This makes all the nodes independently operational and to operate in sync.
When you congure VLT port-channel as upstream member in the uplink state group, the system tracks the fabric Status of VLT. When the
fabric status goes down, the uplink state group in each VLT node disables the downstream VLT port-channel local to the node.
Conguration:
1 Create an uplink-state group in CONFIGURATION mode.
uplink-state-group group-id
2 Congure the upstream and downstream interfaces in UPLINK-STATE-GROUP mode.
upstream {interface-type | interface-range}
downstream {interface-type | interface-range}
3 (Optional) Disable uplink-state group tracking in UPLINK-STATE-GROUP mode.
no enable
4 (Optional) Provide a descriptive name for the uplink-state group in UPLINK-STATE-GROUP mode.
name string
5 Congure the number of downstream interfaces to disable, when an upstream interface goes down in UPLINK-STATE-GROUP mode.
downstream disable links{number | all}
6 (Optional) Enable auto-recovery of downstream interfaces that are disabled in UPLINK-STATE-GROUP mode.
downstream auto-recover
7 (Optional) Congure timer to defer the UFD actions on downstream ports in UPLINK-STATE-GROUP mode.
defer-time timer
8 (Optional) Clear the UFD error disabled state of downstream interfaces in EXEC mode.
clear ufd-disable
Congure uplink state group
OS10(config)# uplink-state-group 1
OS10(conf-uplink-state-group-1)# upstream ethernet 1/1/7:1
OS10(conf-uplink-state-group-1)# downstream ethernet 1/1/1-1/1/5
OS10(conf-uplink-state-group-1)# downstream ethernet 1/1/9:2-1/1/9:3
OS10(conf-uplink-state-group-1)# enable
OS10(conf-uplink-state-group-1)# name UFDGROUP1
OS10(conf-uplink-state-group-1)# defer-time 10
OS10(conf-uplink-state-group-1)# no downstream auto-recover
OS10(conf-uplink-state-group-1)# downstream disable links 2
View uplink state group conguration
OS10#show uplink-state-group 1
Uplink State Group: 1 Status: Enabled,down
OS10# show uplink-state-group 1 detail
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System management