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[vSRX] "vsrx ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 2208" log message on vSRX

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Article ID: KB34307 KB Last Updated: 10 May 2019Version: 1.0
Summary:

This article provides the cause for the vsrx ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 2208 log message to be reported on vSRX devices that are running Junos OS Release 18.2R2, 18.3R1, or 18.4R1.

It also indicates whether any action is required to resolve the message and lists the Junos OS releases in which this problem has been fixed.

 

Symptoms:

The following message appears repeatedly in the messages file of the SRX/vSRX device that is running Junos OS Release 18.2R2, 18.3R1, or 18.4R1.

May 03 07:51:01  vsrx001 usp_ipc_client_send: failed to send message via ipc pipe
May 03 07:51:02  vsrx001 ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 1664
May 03 07:51:02  vsrx001 usp_ipc_client_send: failed to send message via ipc pipe
May 03 07:51:03  vsrx001 ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 1528
May 03 07:51:03  vsrx001 usp_ipc_client_send: failed to send message via ipc pipe
May 03 07:51:04  vsrx001 ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 1936
May 03 07:51:04  vsrx001 usp_ipc_client_send: failed to send message via ipc pipe
May 03 07:51:05  vsrx001 ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 1800
May 03 07:51:05  vsrx001 usp_ipc_client_send: failed to send message via ipc pipe
May 03 07:51:06  vsrx001 ukern_ipc_msg_write: IPC message type: 1032, subtype: 18 exceeds MTU, mtu 1400, length 1664

 

Cause:

Communication between the Routing Engine and the Packet Forwarding Engine takes place via Inter-Process Communication (IPC) messages. Typically, the size of these IPC messages is somewhere around 1300 bytes with 1400 bytes being the permissible upper limit.

However, due to a software modification in Junos OS Releases 18.2R2, 18.3R1, and ​18.4R1, the IPC messages were being generated with a length greater than 1400 bytes, causing the above messages to be reported in the logs.

 

Solution:

This behavior has been fixed in Junos OS Releases 18.2R3, 18.3R2, ​18.4R2, 19.1R1, and 19.2R1.

Meanwhile, these messages can be ignored because they are purely informational and are not traffic disruptive.

 

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