One Of Both M3UA Links Does Not Come Up After a Far End Failure

Asset ID:	1-72-2186600.1
Update Date:	2016-09-26
Keywords:

Solution Type Problem Resolution Sure

Solution 2186600.1 : One Of Both M3UA Links Does Not Come Up After a Far End Failure

Applies to:

Oracle Communications EAGLE (Software) - Version EAGLE 43.x and later
Information in this document applies to any platform.

Symptoms

Eagle does not answer the received ASPUP messages for one of the M3UA links.

****16-08-24 03:01:08****
4848.0236 ** SLK 3215,A8 REPT-LKF: not aligned

Extract of the protocol capture :

Chunk type: INIT (1)

Chunk type: INIT_ACK (2)

Chunk type: COOKIE_ECHO (10)

Chunk type: COOKIE_ACK (11)

Message Type: ASP up (ASPUP) (1)

Message Type: ASP active (ASPAC) (1)

Message Type: Error (ERR) (0)
Message length: 28
Error code (Refused - management blocking)
Parameter Tag: Error code (12)
Parameter length: 8
Error code: Refused - management blocking (13)
Diagnostic Information (8 bytes)
Parameter Tag: Diagnostic Information (7)
Parameter length: 12
Diagnostic information: 0100040100000008

Cause

It is due to the PR 234833; Eagle considers the link is still active so it is rejecting the ASPUP message coming from the far end.

PR234833 :

PROBLEM DESCRIPTION:
It is observed that sometimes IPSG-M3UA link is not getting auto recovered after a link failure
During such events IPSG-M3UA SLK/ASP recovery attempt by far end is failing as the Eagle continuously outputs UIM 1333 for the link with "REASON=Refused Management Blocking (Error Code=0x0d)" and "DIAGNOSTIC=ASP-ACTIVE rcvd; SLK OOS-MT-DSBLD" while link is not actually deactivated on the Eagle.
Eagle is outputting this UIM for more than 2 minutes (which is greater than the MTP restart delay that STP can introduce when link has an unstable history) until a dact-slk/act-slk is performed on the Eagle that resolves the problem (means link is getting recovered normally after dact-slk/act-slk action on Eagle).

6384.1333 CARD 1311,B8 INFO UA RCVD MSG DISCARDED
IP CONNECTION NAME=i1hb1311b8cust ADPTR=M3UA
REASON=Refused Management Blocking (Error Code=0x0d)
DIAGNOSTIC=ASP-ACTIVE rcvd; SLK OOS-MT-DSBLD
Report Date:13-10-17 Time:11:27:10

Solution

Pending the upgrade of the Eagle to solve the issue, there is a workaround : dact-slk/act-slk or delete and re-enter the slk

References

<BUG:19116140> - [234833]IPSG-M3UA SLK NOT AUTO RECOVERING

Attachments

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