Connectivity Guide

Upstream Interfaces : eth1/1/35(Up) *po10(V:Up, ^P:Dwn) VLTi(NA)
Downstream Interfaces : eth1/1/2(Up) *po20(V: Up,P: Up)
OS10#show uplink-state-group 2 detail
(Up): Interface up (Dwn): Interface down (Dis): Interface disabled (NA): Not Available
*: VLT port-channel, V: VLT status, P: Peer Operational status ^: Tracking status
Uplink State Group : 1 Name: iscsi_group, Status: Enabled, Up
Upstream Interfaces : eth1/1/36(Up) *po30(^V:Up, P:Dwn) VLTi(Up)
Downstream Interfaces : eth1/1/4(Up) *po20(V: Up,P: Up)
OS10(conf-uplink-state-group-1)# show configuration
!
uplink-state-group 1
downstream ethernet1/1/1-1/1/5
downstream ethernet1/1/9:2-1/1/9:3
upstream ethernet1/1/7:1
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. If both the VLT peers do not have the same UFD conguration, the UFD does
not work properly.
When you congure VLT port-channel as upstream member in the uplink state group and congure to track the VLT status, 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.
When you congure to track the VLT status, the system places the downstream members of the Uplink State Group in error disabled state
or clears them from the error disabled state based on the operational status of the VLT port-channel.
When you do not track the VLT status, the system tracks the operational status of port-channel.
Track the VLT status using the upstream interface-type track-vlt-status command in UPLINK-STATE-GROUP mode.
To congure VLTi link as member of Uplink State Group, use the upstream VLTi command in UPLINK-STATE-GROUP mode. You
cannot congure VLTi Link as downstream member in an uplink-state group as UFD may disable the VLTi Link when the upstream members
are operationally down. You cannot track the VLT status for an upstream VLTi member.
The following table describes various scenarios when you apply UFD on a VLT network:
Table 52. UFD on VLT network
Event VLT action on primary node VLT action on secondary node UFD action
VLTi Link is operationally down
with heartbeat up
No action VLT module sends VLT port-
channel disable request to
Interface Manager (IFM) for
both uplink and downlink.
UFD receives operationally down
of upstream VLT port-channel
and sends error-disable of
downstream VLT port-channel to
IFM.
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.
Uplink Failure Detection 861