Operation Manual – IGMP SnoopingH3C S9500 Series Routing Switches Chapter 1 IGMP Snooping Configuration1-12IGMP query messages are continually forwarded to other ports of Switch A, devicesattached to these ports keep responding to the queries, thus affecting the operation ofnormal services. The host-port function can be enabled to guard against such attacks.With the host-port function enabled on a port, IGMP quires and PIM hello messagesreceived on this port are dropped. In other words, the port is not maintained as a routerport.In complicated networks like a ring network at the user end, the host-port function canbe enabled to avoid loop-forwarding of IGMP query messages.Follow these steps to configure the host port function:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Enable the host portfunctionigmp-snoopinghost-port vlan { all |vlan-id }RequiredThis function is disabledby default.Note:Do not enable the host port function on a router port.1.2.7 Static Router Port ConfigurationBy configuring a port in a VLAN to be a static router port, you can enable IGMP packetsto be transparently transmitted through the port, meeting the requirements of specificnetworks.I. Configuration prerequisitesz The port and VLAN involved already exist.z The port to be configured belong to the corresponding VLAN.II. Configuring a static router portFollow these steps to configure a port in a VLAN to be a static router port in VLAN view:To do... Use the command... RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —
