NetScaler SDX

Auto recovery for channel member interface

June 4, 2024

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In VPX instances hosted on SDX, the virtual interfaces can go down due to the unlikely occurrence of continuous Tx stalls. This can result in traffic black holes if the affected virtual interfaces are part of a channel, because the physical connection to peer devices is still up.

Notes:

When different types of interfaces become error-disabled, the outcomes are as follows:

If a channel member interface is error-disabled, it causes traffic black holes.

If a normal interface is error-disabled, it causes minor traffic loss and stops sending the traffic.

Starting from release 14.1 build 25.x, an auto recovery option is enabled for the virtual interfaces by default to automatically recover an error-disabled virtual interface and bring the interface back to the UP state.

The auto recovery occurs only if the virtual interfaces are bound to channels, such as static LA or LACP. This feature can be configured using the command set channelparam vfautorecover disable/enable on the VPX instances.

If the virtual interfaces of an HA primary VPX go down and HA monitoring is enabled for the affected channel, a VF reset is also issued on all member interfaces of the same channel, triggering an HA failover.

To ensure SNMP traps are generated for VPX VF auto recovery events, the SNMP alarm interface-auto-recovery must be enabled on the VPX instance.

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Auto recovery for channel member interface

June 4, 2024

Contributed by:

June 4, 2024

Contributed by:

Auto recovery for channel member interface

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