From: arnaud.huret@xxxxxxxxxxxxxx
Date: Fri Dec 07 2001 - 12:42:23 GMT-3
You can have layer 2 redundancy (for example with 2 supervisor cards in
6500 switch ) without spanning-tree.
Only one VLAN on the distribution switch. This switch connected to the 2
backbone L3-switches, but the corresponding vlan not transported between
the backbone switches so no loop.
But 2 connections, one per backbone switch so L2 redundancy.
That's the best way to go.
Spanning-tree is pretty reliable but when it goes wrong, the whole network
is dead. And the only way to solve the issue is to physically unplug some
cable.
It's easier to troubleshoot a L3 problem (my opinion may be not yours, and
I don't say I am right).
Arnaud
Internet
Chris.Larson@ed.gov@groupstudy.com - 07/12/2001 15:38
Veuillez ripondre ` Chris.Larson@ed.gov
Envoyi par : nobody@groupstudy.com
Pour : WILLIAMSG, ccielab
cc :
ccc :
Objet : RE: Layer 2 Redundancy
Actually I have not heard that argument. It depends on what you are doing
and the requirements. We have a 6 switch layer 2 core that feeds our Layer
3
distribution switches and our L3 distribution swiches have layer 2
redundancy with our access switches but run HSRP to provide L3 redundancy
to
the stations hanging of the layer 2 closet access switches.
I have never heard arguments against layer 2 redundancy. I believe in a
well
designed high reliable network from end to end you would need a combination
of both layer 2 and layer 3 redundancy and they go hand in hand to produce
a
healthy, available and efficient network.
-----Original Message-----
From: Williams, Glenn [mailto:WILLIAMSG@PANASONIC.COM]
Sent: Friday, December 07, 2001 8:52 AM
To: 'ccielab@groupstudy.com'
Subject: Layer 2 Redundancy
Hi,
Is the major argument against layer 2 redundancy (vs. layer 3 & HSRP) the
potential for layer 2 loops and problems with spanning tree. So I take it
layer 3 is the best way to go in the industry.
Thanks
GW
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