Bug ID 934017: Problems may occur after creating a node named '_auto_<IP address>'

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8

Opened: Aug 06, 2020
Severity: 3-Major

Symptoms

If a node is created and named '_auto_<IP address>', various problems may occur, including but not limited to: -- If the node is configured as an FQDN template node, no ephemeral nodes may be created based on the FQDN name. -- If the node is configured as an FQDN template node, when the node is deleted, an ephemeral node may be created based on the FQDN name of the deleted node. -- If the node is configured as an FQDN template node with autopopulate enabled, when the node is deleted, ephemeral nodes may be created based on the FQDN name of the deleted node, but with no FQDN template node. -- If the node is configured as an FQDN template node and then deleted, any ephemeral nodes remaining must be deleted manually.

Impact

-- Ephemeral nodes (and pool members) may not be created based on resolution of the FQDN name in the configured node. -- Ephemeral nodes may be created unexpectedly after the configured node is deleted. -- Ephemeral nodes created unexpectedly after the configured node is deleted must be deleted manually.

Conditions

This may occur if: -- A node is created with a name of the form '_auto_<IP address>', such as: - _auto_10.10.10.10 (IPv4 address 10.10.10.10). - _auto_fe80..f811.3eff.fe06.9ab9 (IPv6 address fe80::f811:3eff:fe06:9ab9) -- FQDN template nodes are configured (including the node described above) with FQDN names that resolve to the IP address embedded in the node name.

Workaround

Do not create any node with a name beginning with '_auto_'. That is a reserved name used for creation of FQDN ephemeral nodes.

Fix Information

None

Behavior Change