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ERS 8800/8600: When ERS 8800/8600 Used In MLT / SMLT / IST Setup May Observe Errors (Socket Error - Closing Socket: 270) and (smltProcessMsgs: Problem while reading msg hdr from socket 270+; rcvLen -1)

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TitleERS 8800/8600: When ERS 8800/8600 Used In MLT / SMLT / IST Setup May Observe Errors (Socket Error - Closing Socket: 270) and (smltProcessMsgs: Problem while reading msg hdr from socket 270+; rcvLen -1)
Symptoms

When ERS modular devices are connected in a MLT / SMLT and IST configuration the below log messages appear:
CPU5 [07/25/14 10:29:11] MLT INFO smltSlave: socket error - closing socket: 270
CPU5 [07/25/14 10:29:11] MLT WARNING smltProcessMsgs: Problem while reading msg hdr from socket 270, rcvLen -1
CPU5 [07/25/14 10:31:11] MLT INFO smltSlave: socket error - closing socket: 88
CPU5 [07/25/14 10:31:11] MLT WARNING smltProcessMsgs: Problem while reading msg hdr from socket 88, rcvLen -1

If any of the core switch gets rebooted below message may appear on the device:
CPU5 [08/05/14 22:51:49] HW ERROR framework_unlock: lock/unlock mismatch

You can see errors messages on both the ERS8600 and can appear if either MLT / SMLT or IST or both are configured.

 

Environment
Ethernet Routing Switch 8800/8600 running any supported software version.
Cause

Issue is due to incorrect configuration(s).

Resolution

Below are all the Specific reasons why end-users may see error messages appearing on the core:

Noticed that one of the cores is not sending the socket information on the SMLT packets headers which is the reason why you may be getting the socket read errors on a core switch.

sometimes the "SMLT-VIRTUAL-BMAC" is not configured the same on both the core switches; this configuration is not correct. The "virtual-bmac" should be configured the same on both IST peer switches. 

Example of BMAC configuration being incorrect:
Core-A: spbm 1 smlt-virtual-bmac 00:49:01:45:00:01 
Core-B: spbm 1 smlt-virtual-bmac 00:49:01:45:00:02

Other possible reasons for the error are:
1. MLT / SMLT is configured on one switch and not configured on switch at the other end of the link.
2. Invalid VLAN configuration on the port(s) and MLT/SMLT.

 Note: It is recommended to properly follow the configuration guide for MLT / SMLT configurations strictly.
Additional notes

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