本帖最后由 fanleimin 于 2016-8-24 22:04 编辑 请教一下,关于IP IGMP Snooping问题
当交换机接口开启IP igmp snooping时,交换机会在接口收到spanning-tree topology change TCN后泛洪igmp 流量会在所有接口上泛洪直到返回两个igmp查询包,如果交换机接口频繁up down,就会造成影响, 在3750,2960,4900交换机的物理接口下都有条no ip igmp snooping tcn flood 命令可以关闭在交换机接口收到spanning-tree topology change TCN消息是禁止组播查询泛洪, 最近配置6509时发现为何在6509交换机接口下没有这条命令,查看了配置手册里面没有这个命令呢?
下图为2960交换机配置手册中关于igmp snooping tcn flood命令:
Disabling Multicast Flooding During a TCN Event
When the switch receives a TCN, multicast traffic is flooded to all the ports until two general queries are received. If the switch has many ports with attached hosts that are subscribed to different multicast groups, the flooding might exceed the capacity of the link and cause packet loss. You can use theip igmp snooping tcn flood interface configurationcommand to control this behavior.
6509在物理接口模式下配置igmp snooping tcn flood 提示没有该命令。 查看相关igmp snooping手册, 如下链接:http://www.cisco.com/c/en/us/td/ ... /book/snooigmp.html文中提到只有修改igmp snooping tcp的查询次数和查询间隔时间, 并没有禁用igmp snooping tcn flood的命令, 这是怎么回事呢? 请专家解答一下,谢谢!