What is intrachassis stacking?
A. Intrachassis stacking is the ability to connect multiple EtherSwitch modules via the Gigabit Ethernet connection in the same router. For example, to stack intrachassis is to place two EtherSwitch modules in the same router and connect the modules via the Gigabit Ethernet uplink. Cisco IOS Software Releases 12.2(11)T, 12.3(4)T, and later support this functionality. Two modules in any router is the limit for an intrachassis stack. An intrachassis stack requires a Gigabit Ethernet interface on each module. You must connect the modules externally with the Gigabit Ethernet interfaces and a crossover cable. Intrachassis stacks allow all the Fast Ethernet and Gigabit Ethernet interfaces to participate in the same Layer 2 (L2) domain.
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