>I have a question,
>There is a campus network, with several buildings, and in each building
>there is a main switch (say Catalyst 2924-XL-EN) with vlan on each port.
>Basically there are two ports (out of 24) reserved with fast ether channel to
>the main switch, (for example Catalyst 3524-XL-EN).
>If there are 5 buildings connected to the main switch (with 22 X 5 = 110
>vlans), how to set up the inter vlan routing among all switches, so say a
>computer from Mr. A, from building A, can be moved to building B with the same
>IP address.
Why do you want to keep the same IP address?
Same IP address, or in the same subnet/VLAN? Use DHCP and DNS
whenever possible -- it will greatly simplify moves and changes.
DHCP is still relevant for servers -- you can tie a MAC address to an
IP address and give it an infinite lease.
>
>Can this be done with one main router, for example Cisco 2620, or should it be
>using higher version of Cisco Router, like Cisco 3620, or each
>building should has its own router ?
There's no simple answer. How much traffic stays on a VLAN (e.g., are
the application servers in another building but on the same VLAN),
and how much needs to go to different VLANs?
Again, things depend on traffic patterns. Would there be multiple
VLANs in a given building, with significant traffic between them? If
so, a building level router might make sense, but you would still
need a campus/core router or switch.
Your current solution may be bandwidth limited by not using GigE or
GigEtherchannel. If so, building routers could help keep traffic off
the core.
>
>Also to make the condition above possible (any computer on that campus can be
>moved on any building on that campus), should each computer has its own VLAN
>?
No. VLANs should represent communities of interest -- sets of clients
that use a set of application servers, perhaps with routing (or
VLAN-aware NICs) to common servers such as mail and external
firewall. DHCP and DNS achieve your portability goals.
>If so, that means, if that campus has 10,000 computers, there should be
>around 5 switch (say each switch can support 2000 different vlans) ?
>
>Thanks
I can't ever see wanting that many VLANs.
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