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Knowledge Base

Lost pings and delays in the physical switch during NIC teaming failback (1014325)

Last Updated: 3/21/2024Categories: Total Views: 9754Language:
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Symptoms

Pings are lost during NIC teaming failback

There is a delay in the physical switch detecting NIC teaming failback

accessing-network cannot-ping-host nic-team-failback nic-team-failover no-ping ping-esx ping-failure ping-service-console ping-vm

Purpose

This article provides information about minimizing the delay for a physical switch to detect NIC teaming failback.

Resolution

Packet loss is expected during failback.

If the primary physical adapter is experiencing intermittent failures, the failback setting can lead to frequent changes in the adapter in use. The physical switch sees frequent changes in MAC address, and the physical switch port may not accept traffic immediately when a particular adapter comes online.

To minimize delays or lost pings, disable the following on the physical switch:

Port Security

Spanning tree protocol (STP)

Note: For Cisco-based networks, enable portfast mode for access interfaces or portfast trunk mode for trunk interfaces. This saves about 30 seconds during initialization of the physical switch port. For more information, see STP may cause temporary loss of network connectivity when a failover or failback event occurs (1003804).

Etherchannel negotiation (such as PAgP or LACP)

Trunking negotiation (this saves about four seconds)

Alternatively, set Rolling Failover to yes. With this setting, a failed adapter is left inactive even after recovery until another currently active adapter fails, requiring its replacement.

Related Information

For related information, see VMware Virtual Networking Concepts.

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