Dell PowerConnect 5448 User's Guide - Page 16
Layer 2 Features, Internet Group Membership Protocol IGMP Snooping examines IGMP frame contents - mirror port
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Static MAC Entries User defined static MAC entries are stored in the Bridging Table. For more information, see "Configuring Address Tables" on page 295. VLAN-aware MAC-based Switching Packets arriving from an unknown source address are sent to the microprocessor, where the source addresses are added to the Hardware Table. Packets addressed to or from this address are more efficiently forwarded using the Hardware Table. MAC Multicast Support Multicast service is a limited broadcast service, which allows one-to-many and many-to-many connections for information distribution. Layer 2 Multicast service is where a single frame is addressed to a specific Multicast address, from where copies of the frame are transmitted to the relevant ports. IGMP Snooping is supported, including IGMP Querier which simulates the behavior of a multicast router, allowing snooping of the layer 2 multicast domain even though there is no multicast router. When Multicast groups are statically enabled, you can set the destination port of registered groups, as well as define the behavior of unregistered multicast frames. For more information, see "Multicast Forwarding Support" on page 355. Layer 2 Features IGMP Snooping Internet Group Membership Protocol (IGMP) Snooping examines IGMP frame contents, when they are forwarded by the device from work stations to an upstream Multicast router. From the frame, the device identifies work stations configured for Multicast sessions, and which Multicast routers are sending Multicast frames. For more information, see "IGMP Snooping" on page 366. Port Mirroring Port mirroring monitors and mirrors network traffic by forwarding copies of incoming and outgoing packets from a monitored port to a monitoring port. Users specify which target port receives copies of all traffic passing through a specified source port. For more information, see "Defining Port Mirroring Sessions" on page 292. Broadcast Storm Control Storm Control enables limiting the amount of Multicast and Broadcast frames accepted and forwarded by the device. When Layer 2 frames are forwarded, Broadcast and Multicast frames are flooded to all ports on the relevant VLAN. This occupies bandwidth, and loads all nodes connected on all ports. For more information, see "Enabling Storm Control" on page 289. 16 Introduction