Allied Telesis Patch 89262-08 manual Igmp Snooping All-Group Entry, Show ip igmp

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Patch 89262-08 For AT-8900 Series Switches

show ip igmp

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IGMP Snooping All-Group Entry

Because IGMP is an IP-based protocol, multicast group membership for VLAN aware devices is on a per-VLAN basis. If at least one port in the VLAN is a member of a multicast group, multicast packets will be flooded onto all ports in the VLAN by default.

IGMP snooping enables the switch to forward multicast traffic intelligently on the switch. The switch listens to IGMP membership reports, queries and leaves messages to identify the switch ports that are members of multicast groups. Multicast traffic will only be forwarded to ports identified as members of the specific multicast group.

This enhancement allows network managers to prevent specified ports from acting as IGMP all-group ports, and specify which ports are allowed to behave as all-group entry ports, by using the ENABLE IP IGMP ALLGROUP command.

For example, consider a video streaming service which has 15 channels. When the switch receives IGMP membership reports destined for the address

239.0.0.2from an unauthorised user, all 15 channels of multicast data floods to that port, which may affect the service of the network. In order to avoid this, the network manager decides whether or not to allow a particular port to behave as an IGMP all-group port, e.g. port 8. Then, whenever the above IGMP membership report is sent, the switch will not automatically add port 8 as one of the egress ports for any IGMP membership report group, so video streaming will not get forwarded to disabled all-group ports selected by the network manager.

Command Reference

This enhancement modifies one command:

■SHOW IP IGMP

and has two new commands:

■ENABLE IP IGMP ALLGROUP

■DISABLE IP IGMP ALLGROUP

show ip igmp

Syntax SHOW IP IGMP [COUNTER] [INTERFACE=interface]

Description This command displays information about IGMP, and multicast group membership for each IP interface.

This enhancement includes the line “Disabled All-groups ports” on the output of this command, as shown in Figure 1 on page 24. Ports that are disabled have a “#” symbol next to the port number.

Patch 89262-08 for Software Release 2.6.2 C613-10402-00 REV H

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Contents Introduction Patch For AT-8900 Series SwitchesPCR 40591 Module Swmx Level FeaturesPCR Module IP6 Level PCR 40573 Module LOG LevelPCR 40603 Module SWI, Swmx Level PCR 40596 Module Swmx LevelPCR 40601 Module Swmx Level PCR Module IPG LevelPCR Module BGP Level Patch file details are listed in TablePCR 40460 Module Swmx Level PCR Module OSPF, IPG LevelPCR Module BGP, IGP Level PCR Module STP LevelPCR 40496 Module Dhcp Level PCR Module Ospf LevelPCR 40487 Module Core Level PCR Module Classifier Level PCR Module Vrrp LevelPCR 40516 Module Dhcp Level PCR 40520 Module Dvmrp LevelPCR Module QoS Level PCR 40543 Module Swmx LevelPCR 40544 Module Vlan Level PCR 40550 Module Swmx LevelPCR 40586 Module Swmx Level PCR 40592 Module Bootp LevelPCR 40571 Module Swmx Level PCR 40574 Module Swmx LevelPCR 40521 Module TACACS+ PCR 40525 Module SWI, SWX LevelPCR Module Rstp PCR Module PIM Level PCR Module NTP LevelPCR Module PIM4 Level PCR Module Ipsec LevelPCR Module SWMX,SWI Level PCR Module PPP LevelPCR Module IPv6 Level PCR 40405 Module Enco LevelPCR Module Firewall Level PCR 40413 Module QOS LevelPCR 40416 Module QOS Level PCR 40418 Module Swmx LevelPCR 40441 Module IPG, VRRPLevel PCR 40431 Module SWMXLevelPCR 40433 Module VLANLevel PCR 40440 Module CLASSIFIERLevelPCR 40409 Module Swnp Level PCR 40509 Module Swmx LevelPCR 40371 Module Vlan Level PCR 40363 Module Swnp Level PCR 40313 Module Swnp LevelPCR 40351 Module Vlan Level PCR 40352 Module Swnp LevelPCR 40396 Module Swmx Level PCR 40365 Module EZDRV, IPv6, Swnp LevelPCR 40367 Module Swmx Level PCR 40376 Module QOS LevelPCR Module IPG PCR 40382 Module Swmx LevelPCR Module IPG, SWI Level PCR Module IGMP, SWI LevelPCR Module IPG, IPV6 Level PCR 40249 Module SWI, SwmxPCR Module PIM6 PCR 40274 Module VLAN, Rmon LevelPCR 40341 Module SWMX, SWI PCR Module TM LevelPCR 40334 Module Vlan Level PCR 40338 Module Vlan LevelPCR 40245 Module Swnp PCR 40196 Module SWNP, EzdrvPCR 40213 Module QOS PCR 40224 Module EzdrvPCR Module IPV6 PCR Module OspfShow ip igmp Igmp Snooping All-Group EntryEnable ip igmp allgroup Enable ip igmp allgroupIgmp Snooping Disable ip igmp allgroupDescription where Add igmpsnooping routeraddressDelete igmpsnooping routeraddress Set igmpsnooping routermodeIcmp Redirect Messages for IPv6 Show igmpsnooping routeraddressImport Importing BGP routes into OspfParameter Option/Range Description Set ospfShow ospf Example output from the show ospf commandAvailability Add ip filter
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