From: Guyler, Rik (rguyler@shp-dayton.org)
Date: Mon Sep 17 2007 - 14:08:24 ART
Here's the catch - if you don't put in that trunk link between the two
switches then the traffic really could take a sub-optimal path. Let's say
sw1 is active for vlan1/pc1 and sw2 is active for vlan2/pc2. If pc2 is
connected to sw1, the data from pc2 would have to go all the way up to the
4506, back down to sw2, then back up to the 4506 and possibly back to sw1 if
vlan is the destination. That is a very sub-optimal method for moving data.
If your traffic load isn't high then the end-users may never experience a
serious performance lag but if there will be a lot of traffic on these
switches then I think you should really consider spending a few more dollars
to make this right. Design work is often times the standing up and
screaming about how to do things the right way and not cutting corners for a
few dollars here and there.
Do you have any sort of cabling that runs between the two switches?
Rik
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Donghai Zhang
Sent: Monday, September 17, 2007 9:53 AM
To: Navid Daghighi
Cc: ccielab@groupstudy.com
Subject: Re: where to set the default gateway?
Hi ,dear Rik,you gave me a very detail explanation.thank you very much.As to
the trunk link between the two 3560s, I think is not so necessary because
this link is hard to deployed (distance is too long ,need extra investment
,etc), and, trunk between each 3560 and 4506 would also relay vlans as
well.Your other suggestions are great.
2007/9/17, Navid Daghighi <daghighi.navid@free.fr>:
>
> hi Donghai,
>
> why not use HSRP or VRRP ?
>
> my little 2 cents...
>
> Navid
>
>
> Donghai Zhang a icrit :
> > the topology may look like this:
> >
> >
> >
> > ---------
> > | 4506 |
> > -----------
> > / \
> > / \
> > / \
> > --------- ----------
> > 3560 1 35602
> > --------- ----------
> > | | | |
> > pc1 pc2 PCs
> >
> > suppose pc1 in vlan 10 and pc2 in vlan 20,which 3560 acts as the
> gateway?
> > if 35602 acts as the getway,should pc1 go through 35601 and then
> > 4506
> and
> > then 35602 and then return along the same route and then back
> > 35601,and then finally reach pc2? That seams to be apparently
> > unresonable. But
> how to
> > solve it ? You may set gateway just on 35601,but what about PCs
> > under
> 35602?
> > Don't they encounter the same situation?
> >
> >
> > 2007/9/17, Alexander Belov <abelov@technoserv.ru>:
> >
> >> Can You draw ? :)
> >>
> >> From the bottom story I got You Have 2 (two) distribution layer
> >> Switches...
> >> i.e. 2 x 3560...
> >> Or You are saying You have two 3560s acting as one switch (like a
> >> cluster)?
> >> :)
> >>
> >> WBR,
> >> Alex
> >>
> >> -----Original Message-----
> >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> >> Behalf Of Donghai Zhang
> >> Sent: Monday, September 17, 2007 3:01 PM
> >> To: Marc La Porte
> >> Cc: ccielab@groupstudy.com
> >> Subject: Re: where to set the default gateway?
> >>
> >> Maybe I was not telling this clearly. I mean I need one of the
> >> 3560s to
> be
> >> the gateway of the PCs in the local LAN. No that there are two
> >> 3560s, which one would be proper?
> >>
> >> 2007/9/17, Marc La Porte <marc.a.laporte@gmail.com>:
> >>
> >>> You only have to put a default-gateway on a layer 2 switch, so if
> >>> both 3560s are layer 3 then it's not necessary on there
> >>>
> >>> On 9/17/07, Donghai Zhang <zdh1207@gmail.com> wrote:
> >>>
> >>>> Actually the distribute switches will be L3 at this moment. And
> >>>> the 3560s would be the default gateways of the hosts.The problem
> >>>> is which 3560 to set ?
> >>>>
> >>>> 2007/9/17, Marc La Porte <marc.a.laporte@gmail.com>:
> >>>>
> >>>>> Assuming that the core switch will be L3 and the distribution
> >>>>>
> >> switches
> >>
> >>>>> L2, I would put the SVI on the core switch and the default
> >>>>> gateway
> >>>>>
> >> on
> >> the
> >>
> >>>>> distribution switches
> >>>>>
> >>>>> On 9/17/07, Donghai Zhang <zdh1207@gmail.com > wrote:
> >>>>>
> >>>>>> Dear all,
> >>>>>> I have got a problem recently. Suppose I have two catalyst
> >>>>>> 3560,
> >>>>>>
> >> as
> >>
> >>>>>> distribute switch, one catalyst 4506,as core switch. I need to
> >>>>>> set default-gateways of those hosts inside local LAN in the
> >>>>>>
> >> 3560s.Theploblem is
> >>
> >>>>>> that: in which 3560 should I set the SVI interface? If I set in
> >>>>>>
> >> one,
> >>
> >>>>>> then
> >>>>>> the hosts within the same vlan but connecting to the other
> >>>>>> switch have to travel to this switch so that they can be
> >>>>>> servced routing,thus bandwith would be waste.
> >>>>>> Anyone help me ,thanks advance.
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
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