From: Daniel_Steyn@Dell.com
Date: Mon May 14 2007 - 00:02:16 ART
Sorry - I thought that the question was regarding NIC teaming under
switch fault tolerance where you specifically jack 2 NICs into different
edge switches. If this is the case and you are wanting to protect
against an edge switch failure - then uplinkfast will do nothing for
you.
-----Original Message-----
From: Gary Duncanson [mailto:gary.duncanson@googlemail.com]
Sent: Sunday, May 13, 2007 6:22 PM
To: Steyn, Daniel
Cc: ccielab@groupstudy.com
Subject: Re: NIC Team
Uplinkfast will give you a redundant uplink to the distribution layer.
Also consider jacking NICs into different access switches. Uplinkfast
should still be useful in that scenario for access switch/distribution
switch resilience.
----- Original Message -----
From: <Daniel_Steyn@Dell.com>
To: <gary.duncanson@googlemail.com>; <vramanaiah@gmail.com>
Cc: <ccielab@groupstudy.com>
Sent: Sunday, May 13, 2007 10:00 PM
Subject: RE: NIC Team
"It just stuck me; that this might be providing Fault tolerance when one
of the NIC goes down; but what happens when there is a indirect failure
like the uplink between the Access switch and distribution switch
fails..? "
Many teaming utilities incorporate a feature such as a probe (according
to Intel) or "Livelink" (according to Broadcom). This feature allows
the NICs to communicate with one another (such as HSRP) or alternatively
verify connectivity to a remote device (such as a default gateway).
This is extremely important with any switch fault tolerance teaming
method. With these features, if you were to loose your access-switch
uplink for the active NIC...your pings would fail to the gateway and
your NICs would fail over at the threshold that was appropriate (such as
missing 2 pings). This can even protect you for an indirect failure
within your distribution layer.
Features such as uplinkfast will do nothing for you as this is assuming
that both NICs are jacked into the same switch.
HTH,
Daniel
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gary Duncanson
Sent: Sunday, May 13, 2007 3:30 PM
To: Venkataramanaiah.R
Cc: ccielab@groupstudy.com
Subject: Re: NIC Team
You may find this HA paper on server farms useful.
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns304/c649/cdcco
nt_0900aecd800ea162.pdf
Uplink fast on your access switches should help you out with your
access/distribution resilience.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a
0080094641.shtml
Regards
Gary
----- Original Message -----
From: "Venkataramanaiah.R" <vramanaiah@gmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, May 13, 2007 7:52 PM
Subject: OT : NIC Team
> Question on NIC Teaming...
>
> In fault tolerant mode; we generally connect the two NICs to two
different
> access switches..
>
> It just stuck me; that this might be providing Fault tolerance when
one of
> the NIC goes down; but what happens when there is a indirect failure
like
> the uplink between the Acesss switch and distribution switch fails..?
>
> How does the server come to know of this failure condition? (For its
> outgoing traffic)
>
> Rgds
> -Venkat
>
>
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