tcpdump and etherchannel

[ogniemi]

on standard, none-etherchannel interface I can recognize (using tcpdump) on which switch port interface is connected to.

eg.
tcpdump: listening on en0, link-type 1, capture size 1500 bytes
80414 packets received by filter
0 packets dropped by kernel
Port-ID (0x03), length: 19 bytes: 'GigabitEthernet6/14'

Is there a similiar way to get the port number for each ent being configured in etherchannel? tcpdump of course doesn't work in that case.

 

[hiasor]

Hi,

is that what you are looking for?
netstat -vn | grep -i -E "Link Status|ETHERNET STATISTICS|Port operation"

or try entstat -d "ADAPTER" eg. entstat -d ent10

 

[ogniemi]

no I was thinking about something like this:

tcpdump -nn -v -i en0 -s 1500 -c 1 'ether[20:2] == 0x2000'

giving output like this:

tcpdump: listening on en0, link-type 1, capture size 1500 bytes
10:41:55.398940 snap 0:0:c:20:0 CDP v2, ttl: 180s, checksum: 692 (unverified)
Device-ID (0x01), length: 25 bytes: 'MYSWITCH01.net.somecompany.com'
Version String (0x05), length: 293 bytes:
Cisco Internetwork Operating System Software
IOS (tm) s72033_rp Software (s72033_rp-ADVENTERPRISEK9_WAN-M), Version 12.2(18)SXF4, RELEASE SOFTWARE (fc1)
Technical Support:

http://www.cisco.com/techsupport

Copyright (c) 1986-2006 by cisco Systems, Inc.
Compiled Thu 23-Mar-06 19:38 by tinhuang
Platform (0x06), length: 14 bytes: 'cisco WS-C6513'
Address (0x02), length: 13 bytes: IPv4 (1) 192.168.0.50
Port-ID (0x03), length: 20 bytes: 'GigabitEthernet13/26'
Capability (0x04), length: 4 bytes: (0x00000029): Router, L2 Switch, IGMP snooping
VTP Management Domain (0x09), length: 7 bytes: 'mwv-vtp'
Native VLAN ID (0x0a), length: 2 bytes: 2033
Duplex (0x0b), length: 1 byte: full
AVVID trust bitmap (0x12), length: 1 byte: 0x00
AVVID untrusted ports CoS (0x13), length: 1 byte: 0x00
18 packets received by filter
0 packets dropped by kernel


I have no idea if there is any substitite for etherchannel adapters...even for active adapter in etherchannel in active-backup configuration.