Unless it is absolutely necessary, try to pass only routable protocols through your Layer 3 switches. This is most often accomplished by relegating non-routable protocols to a single VLAN. If you are migrating to a new network infrastructure, consider leaving the non-routable traffic on the old infrastructure. The lagging performance of that network serves as an incentive for users of non-routable protocols to upgrade to an IP-based application.
As Layer 3 switching has grown in popularity, it has demonstrated that ATM is not the only technology capable of great speed. However, ATM does have its place in many campus networks. This section examines some of the more important issues associated with completing an ATM-based campus network design.
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