08-10-2008 07:36 PM - edited 03-06-2019 12:42 AM
Hi,
I am working on a project to design and implement new data center infrastructure Also migrate users from the old network . The current setup is that network has several vlans and each switch is connected to the main switch via fibre. The new network infrastructure will have two core switches 6509, several 4500 series switches for wiring closet and 3750 switches where the devices will be connected. 4500 switch will be connected to both core switches 6509 via fibre. In this situation, what will be the proper network design? Will appreciate any thoughts.
Thanks
08-11-2008 12:30 AM
through ur discription i havnt heard from u any thing about the ditribution layer!!
u need the distribution layer befor the core layer
in other words
it should be like
access switches-- distribution --core
basicaly
on the access layer creat all the required vlans but keep them on lyer two
dont make and vlan interface
on the distribution layer
creat the same vlans here layer two
and then creat a vlan interface SVI fopr each vlan
and this vlan interface will be the default gateway for the access switches in the corsponding vlan
next if u want or and u see it required make a core layer
while i think u dont need it
in ur case the distibution layer will be called
distribution/core layer
the link between the access switches and the dist. switches must be trunk
if u want redundancy and high availabilty
u need two dist switches with identical config to some extend
i mean the ip addresing not meant to be the same but in the same ranges with regard to each vlan
and configure hsrp on the dist switches
in the case the default gateway for each vlan access layer user will be the vertiual interface of that vlan hsrp group
also u have to make the active switch in the hsrp group the root switch in the spanning tree config
for dhcp make the ip helper address on each SVI on the dist. switching pointing to a dhcp server and useing the proper VIP for that vlan group as the default gateway
and add the
spanning-tree portfast on each access port that will be a dhcp client
good luck
please if helpful rate
08-11-2008 06:36 AM
couldn't you just use the access layer switches as distribution/access switches? I mean, they are 4500 and 3750s so they will have all of the routing features plus the port density.
08-11-2008 06:53 AM
ok,
in this case they will stay considered access switches
but this method will be called ROUTED ACCESS Siwtched network
and the distribution layer will be the same place
but the demorication point i mean the layer two and layer three config and transition will be on the access switches not in the distribution switches
and now the view deffrent
the access switches will have and do the following
Switched vlan interfaces SVIs [cleants default gateway in each corsponding vlan]
routing protocol and ip routing enabled
end point connection to the switch will be layer two with vlan assigned
connection between the access switch and the Dist/core switch [uplink] will be through routed interface [layer three interface with IP address]
comunication between the Dist and access through a routing protocol
it is recomended that u dont use HSRP for redundancy but u use equal routing paths becuase it is much quicker in convergence time
finaly no spanning tree is required any more
so the method u gonna use it very good and more reliable
good luck
please, if helful Rate
08-11-2008 01:49 PM
Thanks for your thoughts. So what I got is that:
on access layer switch:
(config)# vlan 6
interface GigabitEthernet1/0/1
switchport access vlan 6
On Distribution Switch:
(config)# interface vlan 6
no ip address
on Core Switch:
(config)# interface vlan 6
ip address 192.168.x.x 255.255.255.0
Did I get that right?
Thanks
08-11-2008 04:03 PM
as u mentioned u gonna use layer three switchs
on the access layer
and i told this will be called routed access layer
so the vlan interface in ur case should be configured on the access switch and the interface between the acces and Dist and Dist and core all routed ports [ layer three port] like a router port
for eaxmple
lets say this is the port connected to the dist switch on the access switch
On Distribution Switch:
interface fa 0/1
no switchport
ip address 1.1.1.1 255.255.255.0
and this is dist side:
interface f 1/1
no switchport
ip address 1.1.1.2 255.255.255.0
and so on
and what i have told u so far is a background
now the following link will give u the deails and all the config and concept with regard to ur case
http://www.cisco.com/application/pdf/en/us/guest/netsol/ns431/c649/ccmigration_09186a00808f6c34.pdf
good luck
please, if helpful Rate
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