Packet capture

The Cisco Nexus 3550-H Hydra (formerly ExaLINK Hydra) management CLI provides a basic packet capture utility. This allows the user to see packets traversing the high speed data plane on the CLI, which is very useful during commissioning, debugging etc.

Clearly it is not possible for the CLI to capture traffic flowing at line rate, so this intention of this feature is for packet capture when there is a small amount of traffic flowing on the wire.

In order to capture traffic flowing into a port, the packet-dump command should be used on the desired port as follows:

admin@EXALINK-HYDRA# packet-dump ethernet20/1
00:52:23.740376 IP 10.10.0.1 > 10.10.0.4: ICMP echo request, id 4301, seq 13, length 64
    0x0000:  643f 5f01 303b 643f 5f01 2f04 0800 4500  d?_.0;d?_./...E.
    0x0010:  0054 e47a 4000 4001 4216 0a0a 0001 0a0a  .T.z@.@.B.......
    0x0020:  0004 0800 e9b7 10cd 000d 47cb d45c 0000  ..........G..\..
    0x0030:  0000 1973 0900 0000 0000 1011 1213 1415  ...s............
    0x0040:  1617 1819 1a1b 1c1d 1e1f 2021 2223 2425  ...........!"#$%
    0x0050:  2627 2829 2a2b 2c2d 2e2f 3031 3233 3435  &'()*+,-./012345
    0x0060:  3637

This page was last updated on Feb-18-2021.