By default, Multilayer switching does not work for all routed protocols. For example, routed protocols such as Novell's Internetwork Packet Exchange (IPX) and Apple's AppleTalk are routed only in software, not in hardware.
In addition to this, there are some protocols, such as DECnet, that are simply not routable. These protocols, however, may be bridged between different VLANs and routed interfaces using fallback bridging, which allows the switch to forward traffic that cannot be routed.
Fallback bridging allows two or more VLANs or routed ports to forward non-routable traffic between them by assigning them to the same . . .
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