Setting The Failover Limit; Manually Monitoring Port Links - Lenovo Flex System Fabric CN4093 Application Manual

Setting the Failover Limit

Manually Monitoring Port Links

Monitor Port State
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Figure 58. Two trunks, one Failover Trigger
Internet
Enterprise
Routing Switch
The failover limit lets you specify the minimum number of operational links
required within each trigger before the trigger initiates a failover event. For
example, if the limit is two, a failover event occurs when the number of operational
links in the trigger is two or fewer. When you set the limit to zero, the switch
triggers a failover event only when no links in the trigger are operational.
The Manual Monitor allows you to configure a set of ports and/or trunks to
monitor for link failures (a monitor list), and another set of ports and/or trunks 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
trunk 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.
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 trunk, the port must be in the Aggregated state.

If any of the above conditions is false, the monitor port is considered to have failed.
Trigger 1
Switch 1
Trigger 1
Switch 2
Server 1
Server 2
Server 3
Server 4
VLAN 1:
VLAN 2:
VLAN Monitor = Off
Chapter 34: Layer 2 Failover
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