From: Ash (nester2k@gmail.com)
Date: Mon Sep 17 2007 - 14:17:25 ART
Donghai,
All good suggestions have already been made :) so there's not much to add
except that another way of making the hosts on both switches in different
vlans talk to each other is to create the same vlans (10 and 20) on both
switches with the respective svi's and breakup the logical ip subnet lets
say a /24 into a /25. this will allow half of the hosts in each subnet to
reside on the local switch with their own svi's to be used as the default
gateways.
Then enable routing between the 3560's and the 4506 to advertise the
respective subnets to allow for communication between the hosts on the two
3560's. With this, if one of the 3560 looses its uplink to the 4506, the
hosts that are local to it will be able to communicate to each other and not
loose reachability entirely.
regards,
On 9/17/07, Donghai Zhang <zdh1207@gmail.com> wrote:
>
> Hi ,dear Rik,you gave me a very detail explanation.thank you very much.Asto
> 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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