From: Donghai Zhang (zdh1207@gmail.com)
Date: Tue Sep 18 2007 - 03:01:19 ART
Dear Ash, your tackle is very close to mine and is interesting. I like the
respective SVIs on each switch,but why not just use the same subnet,say a
/24? Secondly, these two 3560s could communicate with each other
automatiaclly without the intercept of 4506, they themselves are also L3
switches here. Surely I would enable routing between 3560 and 4506, but the
task is to route traffic outside local LAN, not for inter-vlan traffic.
2007/9/18, Ash <nester2k@gmail.com>:
>
> 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.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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