Allied Telesis SB251-13 manual Multicast Listener Discovery Snooping

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Patch SB251-13 For SwitchBlade 4000 Series Switches and AT-9800 Series Switches

15

Multicast Listener Discovery Snooping

Multicast Listener Discovery (MLD) snooping enables the switch to forward IPv6 multicast traffic intelligently, instead of flooding it out all ports in the VLAN.

Without MLD snooping, multicast group membership for VLAN aware devices is on a per-VLAN basis, because MLD is an IPv6-based protocol. If at least one port in the VLAN is a member of a multicast group, and MLD snooping is not used, IPv6 multicast packets will be flooded onto all ports in the VLAN. With MLD snooping, the switch passively listens to MLD joins / reports and leaves / done messages, to identify the switch ports that have received joins and/or leaves from devices attached to them. Multicast traffic will only be forwarded to those ports. MLD snooping will also identify ports that are connected to another router or switch and forward messages out those ports appropriately.

MLD snooping is performed at Layer 2 on VLAN interfaces automatically. By default, the switch will only forward traffic out those ports with routers or IPv6 multicast listeners, therefore it will not act as a simple hub and flood all IPv6 multicast traffic out all ports. MLD snooping is independent of the MLD and Layer 3 configuration, so an IPv6 interface does not have to be attached to the VLAN, and MLD does not have to be enabled or configured. MLD is described in the “IPv6 Multicasting” chapter of the AT-9800 Series Switch Software Reference.

MLD snooping will not generate MLD query messages, but will relay MLD queries from other routers or switches attached to one of its ports to other ports in the same VLAN.

MLDv2 supports Multicast Address and Source Specific messages. These messages enable a host to listen to traffic from a particular source to a particular multicast address, instead of all traffic for the group. MLD snooping cannot snoop these messages, because the address information is contained within the packet’s IPv6 Layer 3 header. These messages will be flooded to all ports in the VLAN. The switch will snoop MLDv1 message types 130 (Query), 131 (Listener Report) and 132 (Listener Done), as specified in RFC 2710, Multicast Listener Discovery (MLD) for IPv6, October 1999.

Multicast group membership registration entries on the switch will time out after no data or messages have been received for that group on that port for 270 seconds.

The following multicast addresses are used by IPv6 for special purposes, and will always be flooded:

FF02::1

(All nodes)

FF02::2

(All routers)

FF02::4

(DVMRP)

FF02::5

(OSPFIGP)

FF02::6

(OSPFIGP Designated routers)

FF02::9

(RIPv2)

FF02::d

(PIM)

FF02::f

(CBT)

FF02::12

(VRRP)

Patch SB251-13 for Software Release 2.5.1 C613-10361-00 REV M

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Contents Introduction Features in SB251-13 PCR 03643 Module CLNS/OSILevel PCR 03688 Module SYSRLevelPCR 03714 Module VLANLevel PCR Module SWI Level PCR 03717 Module IP, Swcx LevelPCR Module TTY, User Level PCR Module SWI, STP LevelPCR 03751 Module Mlds Level PCR Module FILE, INSTALL, SCR LevelPCR Module Install Level PCR Module Vrrp LevelPCR Module Utility Level PCR 03800 Module Load LevelPCR 03801 Module Mlds Level PCR Module Firewall LevelPCR 03829 Module Swcx Level PCR 03819 Module Swcx LevelPCR 03821 Module Swcx Level PCR 03823 Module Vlan LevelPCR 03837 Module Vlan Level PCR 03834 Module Swcx LevelPCR 03835 Module Vlan Level PCR Module Ospf LevelPCR Module Cflash Level PCR 03857 Module Swcx LevelPCR Module DHCP, Telnet Level PCR 03879 Module Dhcp LevelPCR Module SWICX, SWI Level PCR 03887 Module Swcx LevelPCR 03923 Module Core Level PCR 03913 Module Swcx LevelPCR Module IP, ARP Level PCR Module PIM LevelPCR Module SWCX, SWI Level PCR Module SWI, Core LevelPCR 03966 Module Mlds Level PCR Module BGP, IPG LevelPCR 031006 Module STP SWI Level PCR 031008 Module Cflash Install LevelPCR 031003 Module QOS Level PCR 031005 Module Swcx LevelPCR 031033 Module Level Multicast Listener Discovery Snooping To enable MLD snooping, use the command Example output from the Show Mldsnooping command Example output from the Show Mldsnooping Counter command Features in SB251-12 PCR 03661 Module Swcx LevelPCR 03744 Module IPG, Swcx Level PCR Module FIREWALL, LB Level PCR 03777 Module QOS LevelPCR 03782 Module QOS Level PCR Module IPG, SWI, Vrrp LevelPCR Module LB Level PCR Module Alarm LevelPCR Module Ping Level PCR Module PIM, PIM6 LevelPCR 03217 Module Dvmrp Level PCR 03229 Module Load Level PCR 032231 STP LevelPCR 03239 Module QOS Level PCR 03256 Module MLD Level PCR Module ETH, IPG LevelPCR Module SWI, IPG, PIM Level PCR 03248 Module Vlan LevelPCR Module PPP Level PCR 03273 Module Alarm LevelPCR 03260 Module SWI, Snmp Level PCR Module VLAN, IPG LevelPCR Module L2TP Level PCR Module CORE, SWI LevelPCR 03316 Module Core Level PCR Module TTY Level PCR Module DHCP, Q931, Telnet LevelPCR Module Level PCR 03331 Module SWI, Vlan LevelFeatures in SB251-11 PCR Module SWI,VLAN Level PCR 03067 Module Dhcp LevelPCR Module Cure Level PCR 03078 Module SWI, Vlan LevelPCR 03095 Module Dhcp Level PCR 03126 Module Dhcp LevelPCR 03167 Module Dvmrp Level PCR Module Port LevelPCR Module CORE, FFS, TTY Level PCR 03185 Module Dhcp LevelPCR 03209 Module Alarm PCR 03229 Module Load Level PCR 03239 Module QOS Level PCR 03256 Module MLD Level PCR Module IPV6 Level PCR Module Firewall Level PCR 03331 Module SWI, Vlan Level PCR 03371 Module Dhcp Level PCR 03359 Module Core LevelPCR Module Ipsec Level PCR 03424 Module Dhcp Level PCR 03388 Module Dhcp LevelPCR Module OSI/CLNS Level PCR Module SSL LevelPCR Module IPX Level PCR 03429 Module SWI, Vlan LevelPCR 03436 Module IP, Dhcp Level PCR 03438 Module Dhcp LevelPCR 03443 Module Dhcp Level PCRPCR Module PIM4 Level PCR 03469 Module Core Level PCR 03465 Module Dhcp LevelPCR Module BGP, Firewall Level PCR 03492 Module HTTP, Load LevelPCR Module Ikmp Level PCR 03515 Module Dhcp LevelPCR 03547 Module Dhcp Level PCR Module ALARM, Cflash LevelPCR Module BGP, TCP Level PCR Module HTTP, Firewall LevelPCR 03561 Module Core Level PCR Module FIREWALL, IPG Level PCR 03584 Module MLD LevelPCR 03590 Module Dhcp Level PCR Module FW Level PCR 03593 Module CORE, Snmp LevelPCR 03599 Module Core Level PCR 03633 Module Swcx Level PCR 03618 Module Dhcp LevelPCR Module STP, SWI Level PCR Module Classifier LevelPCR 03644 Module Snmp Level PCR 03647 Module Snmp LevelPCR 03648 Module Core Level PCR 03670 Module Swcx Level PCR Module File LevelPCR 03698 Module Dvmrp Level PCR 03683 Module Swcx LevelPCR 03690 Module Core Level PCR 03694 Module Swcx LevelPCR 03709 Module Swcx Level PCR Module SW LevelPCR 03725 Module Swcx Level Patch file details are listed in Table Features in SB251-08Features in SB251-07 PCR Module SWI, Sysr Level Features in SB251-06Features in SB251-05 PCR Module SWIFeatures in SB251-04 Features in SB251-03 PCR Module TCP Level3PCR Module GUI Level2 PCR 03071 Module Core Level PCR Module IPG, SWI LevelPCR Module Core Level PCR Module SWI Network affecting No Features in SB251-02PCR Module Switch Network affecting No PCR 02574 Module Dvmrp Network affecting NoPCR 03047 Module Core Network affecting No PCR Module SWITCH, IPG Network affecting NoPCR Module Firewall Network affecting No PCR Module QOS Network affecting NoFeatures in SB251-01 PCR 02568 Module Core Network affecting NoPCR 02396 Module Dhcp Network affecting No PCR Module IPG, SWI Network affecting No AvailabilityPCR Module Ospf Network affecting No PCR Module SWI Classifier Network affecting No

SB251-13 specifications

The Allied Telesis SB251-13 is a robust Layer 2 managed switch designed to meet the demands of various networking environments. With a comprehensive set of features, it serves as an ideal solution for enterprises looking to enhance their network infrastructure while maintaining performance and reliability.

One of the standout features of the SB251-13 is its 24 Gigabit Ethernet ports, which provide high-speed connectivity essential for modern applications. This switch supports both copper and fiber connections, making it versatile for different deployment scenarios. Additionally, it includes two SFP (Small Form-Factor Pluggable) ports that enable flexibility in uplink configurations, allowing for connectivity over longer distances with fiber optics.

The switch operates on a Layer 2 architecture, which ensures efficient data handling and robust traffic management. With VLAN (Virtual Local Area Network) support, users can segment their networks for improved traffic isolation and security. This feature is particularly beneficial in environments where segmentation is critical for performance and compliance.

Quality of Service (QoS) is another critical characteristic of the SB251-13, enabling priority-based traffic handling. This means that time-sensitive data, such as VoIP or video streams, can be given precedence over less critical traffic. This prioritization enhances the overall user experience and is vital for ensuring the smooth operation of real-time applications.

Allied Telesis also includes advanced security features in the SB251-13, such as port security, MAC address filtering, and access control lists (ACLs). These measures help protect the network from unauthorized access and potential threats, making it suitable for both enterprise and educational environments.

Power over Ethernet (PoE) support is another significant advantage of the SB251-13. This feature allows the switch to provide power to connected devices like IP cameras, phones, and access points, eliminating the need for separate power sources and making installations cleaner and more efficient.

The SB251-13 is also equipped with a user-friendly web-based management interface, facilitating easy configuration and monitoring. Network administrators can quickly set up, manage, and troubleshoot, streamlining operations and reducing downtime.

In conclusion, the Allied Telesis SB251-13 stands out as a sophisticated managed switch that combines performance, security, and manageability. Its rich feature set makes it a valuable asset for organizations aiming to build a reliable and efficient network infrastructure.
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