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Cisco Bug: CSCup94850 - OOB CVT being fragmented

Last Modified

Jun 23, 2020

Products (1)

  • Headend System Releases

Known Affected Releases

dncs-6.0.0.18p5

Description (partial)

Symptom:
Settops boxes cannot download code

Conditions:
When the OOB CVT message goes around 159 the message gets segmented
listCVT -w | egrep "Immed|Emerg"  |wc -l
     159

snoop -x0 -d e1000g1  dst host 239.79.2.33 and dst port 13820 and ether[74:2]=0x8063
Using device e1000g1 (promiscuous mode)
     dncsatm -> 239.79.2.33  UDP IP fragment ID=32440 Offset=0    MF=1 TOS=0x0 TTL=64

           0: 0100 5e4f 0221 000c 2988 3db3 0800 4500    ..^O.!..).=...E.
          16: 05dc 7eb8 2000 4011 179c 46b8 8694 ef4f    ..~. .@...F....O
.
.
.
.
.
.
     1168: 010c 009a 2517 0456 0456 08c4 010c 009a    ....%..V.V......
        1184: 2517 0451 0452 08c4 010c 009a 2517 044e    %..Q.R......%..N
        1200: 044e 08c4 010c 009a 2517 01fc 01fc 08c4    .N......%.......
        1216: 010c 009a 2517 01f8 01f9 08c4 010c 009a    ....%...........
        1232: 2517 01f6 01f6 08c4 010c 009a 2517 013c    %...........%..<
        1248: 013c 08c4 010b 0094 26a5 0138 0138 08c4    .<......&..8.8..
        1264: 010b 0094 26a5 0135 0136 08c4 010b 0094    ....&..5.6......
        1280: 26a5 0131 0132 08c4 010b 0094 26a5 012e    &..1.2......&...
        1296: 012f 08c4 010b 0094 26a5 0102 0102 08c4    ./......&.......
        1312: 010c 0099 2737 0100 0100 08c4 010c 0099    ....'7..........
        1328: 2737 00f9 00f9 08c4 010b 0093 23d2 00f4    '7..........#...
        1344: 00f4 08c4 010b 0093 23d2 00f2 00f2 08c4    ........#.......
        1360: 010b 0093 23d2 00f1 00f1 08c4 010b 0093    ....#...........
        1376: 03d2 00e7 00eb 08c4 010c 0097 2699 00d6    ...ç.ë......&...
        1392: 00d6 08c4 010b 0092 2441 00d4 00d4 08c4    ........$A......
        1408: 010b 0092 2441 0086 0086 08c4 010b 0095    ....$A..........
        1424: 03de 0084 0084 08c4 010b 0090 23de 0083    ............#...
        1440: 0083 08c4 010b 0095 23de 0082 0082 08c4    ........#.......
        1456: 010b 0095 03de 0081 0081 08c4 010b 0090    ................
        1472: 23de 0080 0080 08c4 010b 0090 03de 003d    #..............=
        1488: 003d 08c4 0104 0642 01fc 0038 0038 08c4    .=.....B...8.8..
        1504: 0104 0642 01fc 0033 0036                   ...B...3.6
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