tailieunhanh - configuring cisco avvid phần 8

Nếu một vấn đề xảy ra trên hệ thống Unity của bạn mà bạn hoặc đại lý bán lẻ của bạn không thể sửa chữa, sau đó Unity Hỗ trợ kỹ thuật đòi hỏi PCAnywhere cho xử lý sự cố. Vì vậy, điều quan trọng là để cài đặt Symantec PCAnywhere32 hoặc . | Design Considerations in a WAN Campus Environment Chapter 7 249 UplinkFast This feature is most useful on wiring closet or workgroup switches where endstations connect into the network. The UplinkFast feature would be implemented on redundant uplinks between workgroup access layer switches and the core back-bone switches by creating an uplink group of multiple ports only one of which is forwarding. Within two seconds of a link failure UplinkFast will restore connectivity to the network backbone. UplinkFast can also provide load balancing between redundant uplinks. UplinkFast is not intended for backbone or distribution layer switches. BackboneFast Connectivity to a backbone switch can be restored rapidly with the BackboneFast feature. BackboneFast can detect a link failure on a link that is not directly connected to the switch by listening for certain types of STP messages. When a failure is detected the switch can immediately transition a port from blocking to forwarding mode in order to provide an alternate path around the failed link. This capability allows a switch connected to the backbone to react much faster to indirect failures. In order for BackboneFast to work correctly it must be enabled on all switches within the network. Per VLAN Spanning Tree PVST Redundancy and load balancing can be implemented on connections between access layer and core network switches using the PVST feature. PVST can also help to reduce STP convergence times since the PVST topologies should be smaller than if a single spanning tree topology was used in the network. EtherChannel Fast EtherChannel FEC and Gigabit EtherChannel GEC enable multiple physical connections between devices to be aggregated or bundled into a single logical channel. The primary benefits of using FEC and GEC are increased bandwidth and redundancy between switches and the ability to load balance traffic on uplinks between 250 Chapter 7 Design Considerations in a WAN Campus Environment .