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          <td colspan="2" class="chinesefont105pt"> <BR>51. 当某个交换机的第3层交换失效时,可在交换机的特权模式下输入下列命令: </P>
<P>switch(enable) set mls enable </P>
<P>52. 若想改变老化时间的值,可在特权模式下输入以下命令: </P>
<P>switch(enable) set mls agingtime agingtime </P>
<P>53. 设置快速老化: </P>
<P>switch(enable) set mls agingtime fast fastagingtime pkt_threshold </P>
<P>54. 确定那些MLS-RP和MLS-SE参与了MLS,可先显示交换机引用列表中的内容再确定: </P>
<P>switch(enable) show mls include </P>
<P>55. 显示MLS高速缓存记录: </P>
<P>switch(enable) show mls entry </P>
<P>56. 用命令show in arp显示ARP高速缓存区的内容。 </P>
<P>57. 要把路由器配置为HSRP备份组的成员,可以在接口配置模式下使用下面的命令: </P>
<P>router(config-if)# standby group-number ip ip-address </P>
<P>58. 为了使一个路由器重新恢复转发路由器的角色,在接口配置模式下: </P>
<P>router(config-if)# standy group-number preempt </P>
<P>59. 访问时间和保持时间参数是可配置的: </P>
<P>router(config-if)# standy group-number timers hellotime holdtime </P>
<P>60. 配置HSRP跟踪: </P>
<P>router(config-if)# standy group-number track type-number interface-priority </P>
<P>61. 要显示HSRP路由器的状态: </P>
<P>router# show standby type-number group brief </P>
<P>62. 用命令show ip igmp确定当选的查询器。 </P>
<P>63. 启动IP组播路由选择: </P>
<P>router(config)# ip muticast-routing </P>
<P>64. 启动接口上的PIM: </P>
<P>dalllasr1&gt;(config-if)# ip pim {dense-mode|sparse-mode|sparse-dense-mode} </P>
<P>65. 启动稀疏-稠密模式下的PIM: </P>
<P>router# ip multicast-routing </P>
<P>router# interface type number </P>
<P>router# ip pim sparse-dense-mode </P>
<P>66. 核实PIM的配置: </P>
<P>dallasr1&gt;# show ip pim interface[type number] [count] </P>
<P>67. 显示PIM邻居: </P>
<P>dallasr1&gt;# show ip neighbor type number </P>
<P>68. 为了配置RP的地址,命令如下: </P>
<P>dallasr1&gt;# ip pim rp-address ip-address [group-access-list-number][override] </P>
<P>69. 选择一个默认的RP: </P>
<P>dallasr1&gt;# ip pim rp-address </P>
<P>通告RP和它所服务的组范围: </P>
<P>dallasr1&gt;# ip pim send-rp-announce type number scope ttl group-list access-list-number </P>
<P>为管理范围组通告RP的地址: </P>
<P>dallasr1&gt;# ip pim send-rp-announce ethernet0 scope 16 group-list1 </P>
<P>dallasr1&gt;# access-list 1 permit 266.0.0.0 0.255.255.255 </P>
<P>设定一个RP映像代理: </P>
<P>dallasr1&gt;# ip pim send-rp-discovery scope ttl </P>
<P>核实组到RP的映像: </P>
<P>dallasr1&gt;# show ip pim rp mapping </P>
<P>dallasr1&gt;# show ip pim rp [group-name|group-address] [mapping] </P>
<P>70. 在路由器接口上用命令ip multicast ttl-threshold ttl-value设定TTL阀值: </P>
<P>dallasr1&gt;(config-if)# ip multicast ttl-threshold ttl-value </P>
<P>71. 用show ip pim neighbor显示PIM邻居表。 </P>
<P>72. 显示组播通信路由表中的各条记录: </P>
<P>dallasr1&gt;show ip mroute [group-name|group-address][scoure][summary][count][active kbps] </P>
<P>73. 要记录一个路由器接受和发送的全部IP组播包: </P>
<P>dallasr1&gt; #debug ip mpacket [detail] [access-list][group] </P>
<P>74. 要在CISCO路由器上配置CGMP: </P>
<P>dallasr1&gt;(config-if)# ip cgmp </P>
<P>75.配置一个组播路由器,使之加入某一个特定的组播组: </P>
<P>dallasr1&gt;(config-if)# ip igmp join-group group-address </P>
<P>76. 关闭 CGMP: </P>
<P>dallasr1&gt;(config-if)# no ip cgmp </P>
<P>77. 启动交换机上的CGMP: </P>
<P>dallasr1&gt;(enable) set cgmp enable </P>
<P>78. 核实Catalyst交换机上CGMP的配置情况: </P>
<P>catalystla1&gt;(enable) show config </P>
<P>set prompt catalystla1&gt; </P>
<P>set interface sc0 192.168.1.1 255.255.255.0 </P>
<P>set cgmp enable </P>
<P>79. CGMP离开的设置: </P>
<P>Dallas_SW(enable) set cgmp leave </P>
<P>80. 在Cisco设备上修改控制端口密码: </P>
<P>R1(config)# line console 0 </P>
<P>R1(config-line)# login </P>
<P>R1(config-line)# password Lisbon </P>
<P>R1(config)# enable password Lilbao </P>
<P>R1(config)# login local </P>
<P>R1(config)# username student password cisco </P>
<P>81. 在Cisco设备上设置控制台及vty端口的会话超时: </P>

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