User guide

6-2 SUMMIT SWITCH INSTALLATION AND USER GUIDE

WITCH

ORWARDING

ATABASE

(FDB)

Switch is reset or a power off/on cycle occurs. For more information about setting

the aging time, refer to the section ÒConÞguring FDB Entries,Ó later in this chapter.

¥ Static entries Ñ If the aging time is set to zero, all aging entries in the database are

deÞned as static, non-aging entries. This means that they do not age, but they are

still deleted if the Switch is reset.

¥ Permanent entries Ñ Permanent entries are retained in the database if the Switch is

reset or a power off/on cycle occurs. The system administrator must make entries

permanent. A permanent entry can either be a unicast or multicast MAC address. All

entries entered by way of the command-line interface are stored as permanent. The

Switch can support a maximum of 64 permanent entries.

HOW FDB ENTRIES GET ADDED

Entries are added into the FDB in two ways:

¥ The Switch can learn entries. The Switch updates its FDB with the source MAC

address from a packet, the VLAN, and the port identiÞer on which the source packet

is received.

¥ You can enter and update entries using a MIB browser, an SNMP Network Manager,

or the command-line interface, as described in the next section.

CONFIGURING FDB ENTRIES

To conÞgure entries in the FDB, use the commands listed in Table 6-1.

Table 6-1: FDB Conﬁguration Commands

Command Description

create fdbentry <macaddress> vlan

<name> <portlist> {qosprofile <qosname>}

Creates a permanent FDB entry. Specify the

following:

■ macaddress — Device MAC address, using

colon separated bytes.

■ name — VLAN associated with MAC address.

■ portlist — Port numbers associated with

MAC address.

■ qosname — QoS profile associated with MAC

address.

If more than one port number is associated with a

permanent MAC entry, packets are multicast to the

multiple destinations.

SUMMIT.BK Page 2 Thursday, September 25, 1997 12:33 PM