RE: traceroute question

Agree, but only if both, switch and server are configured as Etherchannel,
something that OP did not mention. NIC teaming is not equivalent of
Etherchannel. You can run LACP on VMware's virtual switch. Windows does not
support LACP natively but a NIC driver may or may not support it.

But what you do if server with "teamed" interfaces connects to different
switches ? You cannot use etherchannel and the behaviour will be as I
described: MAC flapping.

-----Original Message-----
From: Ryan West [mailto:rwest_at_zyedge.com]
Sent: 2-Jun-10 10:42
To: Jack Router; 'Naufal Jamal'; ccielab_at_groupstudy.com
Subject: RE: traceroute question

Jack / Naufal,

> -----Original Message-----
> Sent: Wednesday, June 02, 2010 10:20 AM
> To: 'Naufal Jamal'; ccielab_at_groupstudy.com
> Subject: RE: traceroute question
>
> Regarding NIC teaming:
> Virtual MAC address will be seen on both switch ports. Not simultaneously
> off course. Server flaps MAC address between NICs and as a result half of
> the sessions will flow via one NIC, other half via other NIC. Per session
flow
> (for example single ftp transfer) cannot exceed a speed of single NIC, but
in
> average with many sessions you can double the speed to the server.
> This MAC flapping can cause switches to send notification MACFLAP_NOTIF
> and this is expected.
>

If a port channel is properly configured you should not get MACFLAP
notifications. You should also only see the MAC address on the port
channel. The virtual MAC address that is chosen is usually the first member
of the team or what the system considers the primary interface.

show mac address-table int po33
Unicast Entries
 vlan mac address type protocols port
-------+---------------+--------+---------------------+--------------------
   7 001c.c468.07da dynamic ip,ipx,assigned,other Port-channel33

show mac address-table address 001c.c468.07da
Unicast Entries
 vlan mac address type protocols port
-------+---------------+--------+---------------------+--------------------
   7 001c.c468.07da dynamic ip,ipx,assigned,other Port-channel33

Group Port-channel Protocol Ports
------+-------------+-----------+-------------------------------------------

----
7      Po7(SU)          -        Gi3/7(P)    Gi4/7(P)
-ryan
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