Cisco Nexus 7000多播IGMP监听启用-数据包到达所有接口

Question

我已经连接了三台服务器到思科Nexus 7000交换机。Server1发送多播数据包，server2订阅多播数据包，server3用于测试。不管我是否订阅了来自server2的组播，或者不是所有的接口都被组播数据包淹没了，即使我已经启用了IGMP监听。

这是怎么回事？？

这是我的配置：

switch(config-vlan)# show ip igmp snooping
Global IGMP Snooping Information:
IGMP Snooping enabled
Optimised Multicast Flood (OMF) enabled
IGMPv1/v2 Report Suppression enabled
IGMPv3 Report Suppression disabled
Link Local Groups Suppression enabled
VPC Multicast optimization disabled
Group timeout configured: never

IGMP Snooping information for vlan 1
IGMP snooping enabled
Lookup mode: IP
Optimised Multicast Flood (OMF) enabled
IGMP querier none
Switch-querier disabled
IGMPv3 Explicit tracking enabled
IGMPv2 Fast leave disabled
IGMPv1/v2 Report suppression enabled
IGMPv3 Report suppression disabled
Link Local Groups suppression enabled
Router port detection using PIM Hellos, IGMP Queries
Number of router-ports: 0
Number of groups: 1
VLAN vPC function disabled
Active ports:
  Eth1/3      Eth1/5      Eth1/7

IGMP Snooping information for vlan 4045
IGMP snooping enabled
Lookup mode: IP
Optimised Multicast Flood (OMF) enabled
IGMP querier none
Switch-querier disabled
IGMPv3 Explicit tracking enabled
IGMPv2 Fast leave disabled
IGMPv1/v2 Report suppression enabled
IGMPv3 Report suppression disabled
Link Local Groups suppression enabled
Router port detection using PIM Hellos, IGMP Queries
Number of router-ports: 0
Number of groups: 0
VLAN vPC function disabled
Active ports:

switch(config-vlan)#

Answer 1

这既简单又尴尬--我们一直在向多播225.0.0.1和239.0.0.1-16发送数据包，它们都是不需要IGMP窥探过滤的组播范围，根据以下信息：

1. IETF规范：https://datatracker.ietf.org/doc/html/draft-ietf-mboned-ipv4-mcast-unusable-01
2. 思科文档(第7-9页)：http://www.cisco.com/c/dam/en/us/support/docs/ip/ip-multicast/ipmlt_wp.pdf