From: Larson, Chris (CLarson@usaid.gov)
Date: Fri Jul 11 2003 - 17:21:21 GMT-3
Yes both uplinks will be trunked, but one of the vlans will be blocked. ie.
on the uplink to core 1 even would be blocked, but it coudl carry both 1 and
2 (failure of core 2). So they will all be trunked.
> -----Original Message-----
> From: Emad [SMTP:emad@zakq8.com]
> Sent: Friday, July 11, 2003 3:56 PM
> To: 'Larson, Chris'; boby2kusa@hotmail.com; ccielab@groupstudy.com
> Subject: RE: Switching: OT network design
> Importance: High
>
> Larson
> U are right in this point and I already know it , but I don't know how
> we will treat the two uplinks of the 4000 switch to the two core
> switches , will each link carry only one vlan or will be trunk? Because
> I need redundancy also , if one link or one core switch failed , I need
> the another link to carry the traffic of both vlans to the another core
> switch
>
> Regards
>
> -----Original Message-----
> From: Larson, Chris [mailto:CLarson@usaid.gov]
> Sent: Friday, July 11, 2003 10:41 PM
> To: 'boby2kusa@hotmail.com'; Emad; ccielab@groupstudy.com
> Subject: RE: Switching: OT network design
>
> If each access layer switch has 2 vlans and a 1 gig uplink to 2 core
> switches then the simplest thing to do is to make 1 core switch root for
> 1
> of the vlans on each access layer switch and the other core root for the
> other vlan on each access-layer switch. Etherchannel is not appropriate
> because etherchannel can only be done to a single switch.
>
> In the Cisco switching guides they use even and odd vlans as an example.
> So
> for instance if each access switch has consecutive vlans ie.
> AccessSwitch1
> = Vlan1, Vlan2 AccessSwitch2 = Vlan2, Vlan 3
>
> Then the config on core 1 is along the lines of
>
> set spanning root vlan 1,3,5,7,9
> set spanning root vlan 2,4,6,8 secondary
>
> And on Core 2
>
> set spanning root vlan 2,4,6,8
> set spanning root vlan 1,3,5,7,9
>
>
>
> Then you will "load balance" across both uplinks from each closet switch
> to
> the core.
>
>
>
>
>
>
>
> > -----Original Message-----
> > From: boby2kusa@hotmail.com [SMTP:boby2kusa@hotmail.com]
> > Sent: Friday, July 11, 2003 3:22 PM
> > To: Emad ; ccielab@groupstudy.com
> > Subject: Re: Switching: OT network design
> >
> > ----- Original Message -----
> > From: "Emad " <emad@zakq8.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Friday, July 11, 2003 11:49 AM
> > Subject: Switching: OT network design
> >
> >
> > > Folks,
> > >
> > > I just wanna share an idea with you all ,
> > >
> > > I have 4506 switch in a network acting as the access layer and
> connected
> > > to two 6513 core switches with 2G uplink per each one,
> > >
> > > Each 4506 switch has 2 vlans and I want to have both uplinks to the
> core
> > > switches working in load balance , how can we guarantee that:
> > >
> > > - By STP layer2 load balance? If yes , plz tell me how?
> > Do you mean load balance the traffic thoughput between the 2 gig
> uplinks
> > or
> > load balance the switches load?
> > Load balancing between the 2 gig link can be accomplished by
> channeling
> > the
> > uplinks. Load balancing the the switch's load (for a lack of a better
> > term)
> > can be accomplished by having the one or the other as the bridge to
> the
> > root
> > (which should be the 6509). For example, 2 vlans, vlan 1 will be
> > forwarding
> > on 4506 A while blocking the vlan 2 and vice versa for the other
> switch.
> > This would be manipulating either the RP cost or the RP priority,
> somebody
> > will correct me if this is the wrong way to manipulate which switch
> should
> > the vlan take on it's way to the root.
> >
> > > - By enabling routing protocol between the access layer and the core
> > > layer , but how?
> > This would be load balancing on layer 3 and you would load balance
> > according
> > to the destination of the traffic, routers look at the routing table
> to
> > forward the packet.
> >
> > >
> > > I read the good paper of CISCO AVVID network infrastructure but I
> didn't
> > > get it because most of scenarios are depending on one vlan and
> > > redundancy between the two uplinks not load balancing and 2 vlans,
> > >
> > > Plz advice
> > >
> > > Thanx
> > >
> > >
> > >
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