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Chapter 8

Layer 2

RUGGEDCOM ROX II

CLI User Guide

286 Purging the Dynamic MAC Address List

• Configure the address on the device as a static MAC address. For more information, refer to Section8.3.4.2,

“Adding a Static MAC Address”.

Section8.3.2

Purging the Dynamic MAC Address List

To purge the dynamic MAC address list of all entries, type:

switch mac-tables purge-mac-table

Once the table is purged, the following message appears:

purge-mac-table-string Success

Section8.3.3

Configuring MAC Address Learning Options

The MAC address learning options control how and when MAC addresses are removed automatically from the

MAC address table. Individual addresses are removed when the aging timer is exceeded. Addresses can also be

removed when a link failure or topology change occurs.

To configure the MAC address learning options, do the following:

1. Make sure the CLI is in Configuration mode.

2. Navigate to switch» mac-tables and configure the following parameter(s) as required:

Parameter Description

mac-aging-time { mac-aging-time } Synopsis:  A 32-bit signed integer between 15 and 800

Default:  300

The time a learned MAC address is held before being aged out.

mac-age-on-loss Synopsis:  { true, false }

Default:  true

When link failure (and potentially a topology change) occurs, the switch may have some

MAC addresses previously learned on the failed port. As long as those addresses are not

aged-out, the switch will still be forwarding traffic to that port, thus preventing that

traffic from reaching its destination via the new network topology. This parameter allows

the aging-out of all MAC addresses learned on a failed port immediately upon link failure

detection.

3. Type commit and press Enter to save the changes, or type revert and press Enter to abort.

Section8.3.4

Managing Static MAC Addresses

Static MAC addresses must be configured when destination devices are only able to receive frames, not transmit

them. They may also need to be configured if port security (if supported) must be enforced.

Siemens RUGGEDCOM ROX II User Manual

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