Bug ID 667278: DSC connections between BIG-IP units may fail to establish

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.10, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 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, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1

Fixed In:
13.1.0, 12.1.3, 11.6.2, 11.5.5

Opened: May 31, 2017
Severity: 3-Major


The device service clustering (DSC) connection between two BIG-IP units may fail to establish. One unit will log messages similar to the following example: -- err mcpd[7912]: 01071af4:3: Inbound CMI connection from IP ( denied because it came from VLAN (v1542), not from expected VLAN (tmm). While the unit at the other end of the connection will log messages similar to the following example: -- notice mcpd[5730]: 01071432:5: CMI peer connection established to port 6699 after 0 retries May 31 20:58:04 BIG-IP-c-sea notice mcpd[5730]: 0107143c:5: Connection to CMI peer has been removed


Config-Sync and device discovery operations will fail between affected units.


This issue occurs when the Self-IP addresses used for Config-Sync by the two BIG-IP units are not in the same IP subnet, and special routing is configured between the BIG-IP units. Examples of special routing include a gateway pool or dynamic routing configurations with multiple routes to the same destination (i.e., ECMP routing).


You can work around this issue by using Self-IP addresses for Config-Sync that are on the same IP subnet or rely on simpler routing to achieve connectivity (i.e., a single route).

Fix Information

Config-Sync and device discovery operations no longer fail.

Behavior Change