User manual SMC 8748L2

[. . . ] TigerSwitch 1000 L2 Gigabit Standalone Switch 48 auto-MDI/MDI-X 10/100/1000BASE-T ports 4 ports shared with 4 SFP transceiver slots Non-blocking switching architecture Support for a redundant power unit Spanning Tree Protocol, and Rapid STP Up to six LACP or static 8-port trunks CoS support for four-level priority Full support for VLANs with GVRP IGMP multicast filtering and snooping Support for jumbo frames up to 9 KB Manageable via console, Web, and SNMP/RMON Management Guide SMC8748L2 TigerSwitch 1000 Management Guide From SMC's Tiger line of feature-rich workgroup LAN solutions 38 Tesla Irvine, CA 92618 Phone: (949) 679-8000 November 2005 Information furnished by SMC Networks, Inc. (SMC) is believed to be accurate and reliable. However, no responsibility is assumed by SMC for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SMC. [. . . ] This procedure is called multicast filtering. The purpose of IP multicast filtering is to optimize a switched network's performance, so multicast packets will only be forwarded to those ports containing multicast group hosts or multicast routers/switches, instead of flooding traffic to all ports in the subnet (VLAN). 3-164 MULTICAST FILTERING Layer 2 IGMP (Snooping and Query) IGMP Snooping and Query -- If multicast routing is not supported on other switches in your network, you can use IGMP Snooping and Query (page 3-165) to monitor IGMP service requests passing between multicast clients and servers, and dynamically configure the switch ports which need to forward multicast traffic. Static IGMP Router Interface -- If IGMP snooping cannot locate the IGMP querier, you can manually designate a known IGMP querier (i. e. , a multicast router/switch) connected over the network to an interface on your switch (page 3-169). This interface will then join all the current multicast groups supported by the attached router/switch to ensure that multicast traffic is passed to all appropriate interfaces within the switch. Static IGMP Host Interface -- For multicast applications that you need to control more carefully, you can manually assign a multicast service to specific interfaces on the switch (page 3-171). Configuring IGMP Snooping and Query Parameters You can configure the switch to forward multicast traffic intelligently. Based on the IGMP query and report messages, the switch forwards traffic only to the ports that request multicast traffic. This prevents the switch from broadcasting the traffic to all ports and possibly disrupting network performance. Command Usage · IGMP Snooping -- This switch can passively snoop on IGMP Query and Report packets transferred between IP multicast routers/switches and IP multicast host groups to identify the IP multicast group members. It simply monitors the IGMP packets passing through it, picks out the group registration information, and configures the multicast filters accordingly. 3-165 CONFIGURING THE SWITCH · IGMP Querier -- A router, or multicast-enabled switch, can periodically ask their hosts if they want to receive multicast traffic. If there is more than one router/switch on the LAN performing IP multicasting, one of these devices is elected "querier" and assumes the role of querying the LAN for group members. It then propagates the service requests on to any upstream multicast switch/router to ensure that it will continue to receive the multicast service. Note: Multicast routers use this information, along with a multicast routing protocol such as DVMRP or PIM, to support IP multicasting across the Internet. Command Attributes · IGMP Status -- When enabled, the switch will monitor network traffic to determine which hosts want to receive multicast traffic. This is also referred to as IGMP Snooping. (Default: Enabled) Act as IGMP Querier -- When enabled, the switch can serve as the Querier, which is responsible for asking hosts if they want to receive multicast traffic. (Default: Enabled) IGMP Query Count -- Sets the maximum number of queries issued for which there has been no response before the switch takes action to drop a client from the multicast group. (Range: 2-10, Default: 2) IGMP Query Interval -- Sets the frequency at which the switch sends IGMP host-query messages. (Range: 60-125 seconds, Default: 125) IGMP Report Delay -- Sets the time between receiving an IGMP Report for an IP multicast address on a port before the switch sends an IGMP Query out of that port and removes the entry from its list. (Range: 5-30 seconds, Default: 10) IGMP Query Timeout -- The time the switch waits after the previous querier stops before it considers the router port (i. e. , the interface which had been receiving query packets) to have expired. (Range: 300-500 seconds, Default: 300) · · · · · 3-166 MULTICAST FILTERING · IGMP Version -- Sets the protocol version for compatibility with other devices on the network. All systems on the subnet must support the same version. Some attributes are only enabled for IGMPv2, including IGMP Report Delay and IGMP Query Timeout. Web ­ Click IGMP Snooping, IGMP Configuration. Adjust the IGMP settings as required, and then click Apply. (The default settings are shown below. ) Figure 3-76. [. . . ] Remote Authentication Dial-in User Service (RADIUS) RADIUS is a logon authentication protocol that uses software running on a central server to control access to RADIUS-compliant devices on the network. Remote Monitoring (RMON) RMON provides comprehensive network monitoring capabilities. It eliminates the polling required in standard SNMP, and can set alarms on a variety of traffic conditions, including specific error types. Rapid Spanning Tree Protocol (RSTP) RSTP reduces the convergence time for network topology changes to about 10% of that required by the older IEEE 802. 1D STP standard. [. . . ]