Intel IXM5414E manual Static MAC filtering, Generic Attribute Registration Protocol Garp

The forwarding function determines the destination port. If the destination, or egress, port is a member of the same VLAN as the packet the destination port transmits the packet on its attached network segment. If the egress port is not a member of the VLAN, the packet is dropped.

IEEE 802.1Q VLAN configuration

The switch module initially configures one VLAN (VID = 1) named DEFAULT. The factory default setting assigns all ports on the switch module to VLAN I. As new VLANs are configured, their respective member ports are removed from VLAN 1. In addition, the VLAN ID value of 4095 is reserved for internal use. Following is additional configuration information:

•Packets cannot cross VLANs. If a member of one VLAN is to connect to a member of another VLAN, the link must be through an external router.

•If no VLANs are configured on the switch module, all packets will be forwarded to any destination port. Packets with unknown source addresses will be flooded to all ports. Broadcast and multicast packets will also be flooded to all ports.

Static MAC filtering

Static MAC Filtering allows you to add a small number (in the order of hundreds) of unicast or multicast MAC addresses directly to the forwarding database. Associated with each Static MAC address is a set of destination ports and VLAN information.

Any packet with a particular Static MAC Address in a particular VLAN is admitted only if the ingress port is in the set of source ports, otherwise the packet is dropped. On the egress side the packet, if admitted, is sent out of all the ports that are in the set of destination ports.

Upon ingress, each packet's destination MAC address is compared against the forwarding database. If the address is not in the table, the packet is flooded within the VLAN. If the address is in the table, then it is checked to see if it has been defined as a filter. If the MAC address is not defined as a filter, forwarding is performed as a normal parced address.

If the specific destination MAC address is defined as a filter, the packet is forwarded to the set of destination ports defined in the filter.

Static entries are never aged and can only be removed by user command.

/NOTE

Even though the above discussion pertains to the forwarding database, MAC filters are not configured and displayed as part of the forwarding database; they are configured and displayed separately.

Generic Attribute Registration Protocol (GARP)

This protocol is used to exchange information between GARP participants to register and de-register attribute values within a bridged LAN. When a GARP participant declares or withdraws a given attribute, the attribute value is recorded with the applicant state machine for that attribute for the port from which the declaration or withdrawal was made. Registration occurs only on ports that receive the GARP PDU containing a declaration or withdrawal. De-registration occurs only if all GARP participants connected to the same LAN segment as the port withdraw the declaration.

30 Intel® Blade Server Ethernet Switch Module IXM5414E