Take your choice of approaches
1. Individual router ports for each vlan (would require 5 FastEthernet ports
- could be supported by 3660, but you'd be stretching the capability of that
chassis. If you expect full wire-speed routing between interfaces, you'll be
disappointed. If you're comfortable with a bottleneck of 10Mbps per VLAN into
the router (not recommended, but a very cheap solution), you could use a 2620
with 5 Ethernet interfaces, but if the traffic level between VLANs rises above
5Mbps, your network will suffer from performance problems, usually equated
with users complaining about very slow response time and timeouts) Cheap and
dirty.
2. VLAN "router on a stick" using ISL trunking between one switch and the
2620. Your performance here is limited to 100Mbps total (you can't use a
FastEtherchannel group for aggregating two ISL trunks on the FastEthernet
interfaces in the 2620 and the switch). You'll experience some performance
issues here, too, if you expect wire-speed 100Mbps-to-100Mbps routing
performance. A little better, but still performance-limited.
3. An L3 switch (2948G-L3) to perform the routing between VLANS, and one feed
from the 2948G-L3 to the router if external access (WAN or Internet) is
required. This solution can provide you with very good routing performance
under the following conditions:
a. Your VLANs are isolated with one VLAN per cascaded switch, or
b. You use FastEtherchannel (to aggregate, or group ISL trunks) between the
core L3 switch and the L2 switches.
More expensive (because a core L3 switch is added to the parts list), but
probably worth the money for the amount of potential traffic headaches it will
save you.
-e-
Irwan Hadi <[EMAIL PROTECTED]> wrote:
> 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.
>
> 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 ?
>
> 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
> ? 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
>
>
>
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