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Cisco Bug: CSCvv13748 - [MONTE] RIR - Maximum-UE-Availability-Time - wrong encoding and wrong value

Last Modified

Sep 17, 2020

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

21.20.0 21.20.4

Description (partial)

Symptom:
Issue #1
*******
Problem Description	Wrongly Encoded Maximum-UE-Availability-Time.


Monday July 06 2020
<<<
Diameter message from 10.230.249.122:36956 to 10.230.255.193:3868
Base Header Information:
Version: 0x01 (1)
Message Length: 0x000288 (648)
Command Flags: 0xc0 (192) REQ PXY 
Command Code: 0x80006f (8388719) Reporting-Information-Request 
Application ID: 0x01000082 (16777346) Diameter T6a
Hop2Hop-ID: 0xadb026cb (2914002635)
End2End-ID: 0x0058fce6 (5831910)
AVP Information:. . . . . 
. . . . . 
[V] Maximum-UE-Availability-Time 
Code: 0x00000d01 (3329) Maximum-UE-Availability-Time
Flags: 0x80 (128) [V] 
Length: 0x000010 (16)
Vendor-Id: 0x000028af (10415) 3GPP
Data: Monday July 06 13:08:28 GMT 2020

HEXDUMP-START
5f 03 22 4c _."L <<< it is UNIX epoch time (Since Jan1 1970); should be DIAMETER Time format (since Jan 1 1900)


https://tools.ietf.org/html/rfc6733

4.3.1. Common Derived AVP Data Formats


….

Time

The Time format is derived from the OctetString Basic AVP Format.
The string MUST contain four octets, in the same format as the
first four bytes are in the NTP timestamp format. The NTP
timestamp format is defined in Section 3 of [RFC5905].

This represents the number of seconds since 0h on 1 January 1900
with respect to the Coordinated Universal Time (UTC).

…

Issue #2
********
Too short Maximum-UE-Availability-Time.

PTW for UE =10,24 sec, 
In the RIR it is available only for 3 seconds. Seems eDRX PTW bitmap 0000011 (3) meaning 10.24 seconds is wrongly interpreted as 3 seconds.

Monday July 06 2020
<<<<OUTBOUND  16:08:25:984 Eventid:92870(5)
Diameter message from 10.230.249.122:36956 to 10.230.255.193:3868
...  
   Command Code:       0x80006f    (8388719) Reporting-Information-Request 
 ...
. . . . . 
        [V]  Maximum-UE-Availability-Time 
        ...
            Data: Monday July 06 13:08:28 GMT 2020 <<<<<< ----- only another 3 seconds remained instead if 10 seconds!

Conditions:
MONTE in use, RIR is triggered, RIR contains a wrongly encoded AVP andMaximum-UE-Availability-Time is too short
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