From: Larry Letterman (lletterm@cisco.com)
Date: Fri Jul 11 2003 - 16:56:37 GMT-3
Each trunk would carry the vlans to the core switch that is the root
switch
For that vlan..the other trunk link would carry the vlans to the other
core switch
That is the root switch for those vlans...
Larry Letterman
Cisco Systems
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Emad
Sent: Friday, July 11, 2003 12:47 PM
To: 'Kleberg, Jason'
Cc: ccielab@groupstudy.com
Subject: RE: Switching: OT network design
No they are not , each 4000 switch has its own unique 2 vlans , if I
think like this , lets go step by step: I have to uplinks from each 400
switch to the core , will I configure them as L2 trunk each one
connected to one of the two 6000 core switches or what? But if this what
u mean , how can I put IP for this trunk!!??
Or I suppose to put each uplink in one vlan on the 4000 switch ? but if
that , to which switch should I connect each one of the two links ,
Remember I have only two links connecting between each 4000 switch and
the two 6000 core switches , therefore , I think each link should carry
the traffic of both networks of both vlans
Plz advice
thanx
-----Original Message-----
From: Kleberg, Jason [mailto:JKleberg@glhec.org]
Sent: Friday, July 11, 2003 10:38 PM
To: 'Emad '
Subject: RE: Switching: OT network design
are they the same vlans on all of the 4000's? if they are not , just
treat the 4000 vlans as 2 networks, then each link to the 6000 as a
separate network and use a routing protocol and have it load balance.
-----Original Message-----
From: Emad [mailto:emad@zakq8.com]
Sent: Friday, July 11, 2003 2:35 PM
To: 'Kleberg, Jason'
Subject: RE: Switching: OT network design
Importance: High
Yes I know Nortel can do it but cisco can't in L2 level , but what will
happen if I tried to run routing protcol, can anybody suggest the
configurations regarding that two vlans on every 4506 switch connected
to the core switch .
Plz advice
thanx
-----Original Message-----
From: Kleberg, Jason [mailto:JKleberg@glhec.org]
Sent: Friday, July 11, 2003 10:23 PM
To: 'Emad '
Subject: RE: Switching: OT network design
I dont think cisco can do this via L2. only nortel to my knowledge can
do it, it is call split multi link trunking(smlt). we do it. cisco
could do it via L3 routing protocol.
-----Original Message-----
From: Emad [mailto:emad@zakq8.com]
Sent: Friday, July 11, 2003 2:18 PM
To: 'Larry Letterman'; ccielab@groupstudy.com
Subject: RE: Switching: OT network design
The uplinks will carry vlans of course , the design is like this:
Three access layer switches , each one has 2 vlans configured and all
the three switches are connected through one uplink to one core and the
another link to the another core switch ,
Of course the core switches will have all the vlans configured on all
the access layer switches but I need to load balance between the two
uplinks connecting between each access layer switch and the core switch,
How can I do it , if I used the routing , shall I turn the port-channel
of the uplinks to be L3 ports or what?
Plz advice
thanx
-----Original Message-----
From: Larry Letterman [mailto:lletterm@cisco.com]
Sent: Friday, July 11, 2003 10:09 PM
To: 'Emad '; ccielab@groupstudy.com
Subject: RE: Switching: OT network design
If the network were L3 to the switches and no vlans, the routing
Protocol could load balance coming down to the switches...
The only way I know to do it, is to make one core the root switch for
one
Vlan and the other core the root for the other..thats not a good design,
but if
You really want to load balance from the core it might work...
Larry Letterman
Cisco Systems
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Emad
Sent: Friday, July 11, 2003 11:50 AM
To: ccielab@groupstudy.com
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?
- By enabling routing protocol between the access layer and the core
layer , but how?
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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