Lenovo ThinkSystem NE2552E, Application Manual

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© Copyright Lenovo 2018 Chapter 31: Layer 2 Failover
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Manually Monitoring Port Links
The Manual Monitor allows you to configure a set of ports and/or LAGs to monitor
for link failures (a monitor list) and another set of ports and/or LAGs to disable
when the trigger limit is reached (a control list). When the switch detects a link
failure on the monitor list, it automatically disables the items in control list. When
server ports are disabled, the corresponding server’s network adapter can detect
the disabled link and trigger a network ‐ adapter failover to another port or LAG on
the switch or another switch in the chassis.
The switch automatically enables the control list items when the monitor list items
return to service.
Monitor Port State
A monitor port is considered operational as long as the following conditions are
true:
 The port must be in the
Link Up
state.
 If STP is enabled, the port must be in the
Forwarding
state.
 If the port is part of an LACP LAG, the port must be in the
Aggregated
state.
If any of the above conditions is false, the monitor port is considered to have failed.
Control Port State
A control port is considered Operational if the monitor trigger is up. As long as the
trigger is up, the port is considered operational from a teaming perspective, even if
the port itself is actually in the
Down
state,
Blocking
state (if STP is enabled on the
port), or
Not Aggregated
state (if part of an LACP LAG).
A control port is considered to have failed only if the monitor trigger is in the
Down
state.
To view the state of any port, use one of the following commands:
NE2552E# show interface link
(View port link status)
NE2552E# show interface port
<x>
spanning-tree stp
<x> (View port STP status)
NE2552E# show lacp information
(View port LACP status)