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Cisco Bug: CSCvv13446 - 64 bytes of garbage message at the end of a decrypted snmp v3 response packet from Nexus7k

Last Modified

Aug 04, 2020

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.3(5)D1(1)

Description (partial)

Symptom:
64 bytes of garbage message at the end of a decrypted snmp v3 response packet from Nexus7k

0000   00 50 56 bd 51 3a 7c ad 74 92 79 80 08 00 45 00   .PV.Q:|.t.y...E.
0010   00 df 2d 35 00 00 3b 11 29 1b 0a c5 e6 63 0a 6a   ..-5..;.)....c.j
0020   2d 2c 00 a1 ad 14 00 cb 94 44 30 81 c0 02 01 03   -,.......D0.....
0030   30 11 02 04 40 a6 c0 1a 02 03 00 ff e3 04 01 03   0...@...........
0040   02 01 03 04 36 30 34 04 0b 80 00 00 09 03 00 3a   ....604........:
0050   9c 76 83 00 02 02 03 3f 02 02 05 83 04 05 61 64   .v.....?......ad
0060   6d 69 6e 04 0c 08 aa a6 bb 83 95 be b8 a4 bb de   min.............
0070   1d 04 08 65 84 1f 75 4e e2 d7 b6 04 70 64 1c d5   ...e..uN....pd..
0080   09 48 2b 0d e7 28 c3 5c 6f 59 5f 52 0f 75 ae 7b   .H+..(.\oY_R.u.{
0090   28 b6 f2 20 93 eb 4d 0e 16 1d c9 c3 b9 98 2b fa   (.. ..M.......+.
00a0   56 57 cc 38 37 45 a3 87 27 62 d7 4f ad 00 00 00   VW.87E..'b.O....
00b0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
00c0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
00d0   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00   ................
00e0   00 00 00 00 00 00 00 00 00 00 00 00 00            .............


As you see at the end the hex display will show 64 bytes of additional trailing garbage data.

Due to this customer is facing to poll SNMP data as their NMS tool is discarding those packet .

We have tested with other NMS tool which seems to work even tough there is 64bit of garbage data but in case of AKIPS NMS tool those packet is being discarded

 AKIPS SNMP tool which validates length to end of packet' values and rejects response packets that contain invalid length values.

Conditions:
Happens when polling n7k through SNMPv3 and AKIPS NMS tool is being used
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