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EMI支持更多的路由功能。
· Standard multilayer image (SMI), which provides Layer 2+ features
(enterprise-class intelligent services). These features include access
control lists (ACLs), quality of service (QoS), static routing, and the
Hot Standby Router Protocol (HSRP) and the Routing Information Protocol
(RIP). Switches with the SMI installed can be upgraded to the EMI.
· Enhanced multilayer image (EMI), which provides a richer set of
enterprise-class intelligent services. It includes all SMI features
plus full Layer 3 routing (IP unicast routing, IP multicast routing,
and fallback bridging). To distinguish it from the Layer 2+ static
routing and RIP, the EMI includes protocols such as the Enhanced
Interior Gateway Routing Protocol (EIGRP) and the Open Shortest Path
First (OSPF) Protocol. |
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