Reference Guide

Switch commands 3 Configuration commands
150 NN47928-107
switch arl
Address Resolution Logic (ARL) maps MAC addresses to specific LAN ports.
This enables switching packets between ports based on the destination
MAC address in the packet. ARL provides these features:
z Dynamic Entries
A MAC address learning process automatically builds the ARL table as a
forwarding database. The entries it creates are dynamic entries, that is,
entries that are flushed regularly from the table.
z Static Entries
You can add entries to the ARL table. The entries created are static
entries; static entries are not aged out of the table. Static entries remain
in the table until the table is flushed.
z Prioritizing Traffic by MAC Address
By defining static ARL entries, you can prioritize traffic by the
destination MAC address in the packet. Each static entry can be
assigned to a priority queue. Packets that match the entry are assigned
to the specified priority queue. Four priority queues are available:
LOWESTQ, LOWQ, HIGHQ, and HIGHESTQ.
Received packets that match a static ARL entry use the priority setting
of that entry. This setting overrides all other layer 2 QoS settings for the
port (including port, ToS and 802.1p). This feature cannot be disabled.
Syntax config switch arl state {dynamic|static] mac <mac address> age
<seconds> priority [lowestq|lowq|highq|highestq] ports
<number>
Parameters state dynamic|static
Enter the type of ARL. The default is dynamic.
mac mac address Enter the MAC address in format
xx.xx.xx.xx.xx.xx.
age seconds Enter the aging interval that determines when
dynamic entries are flushed from the table. The
valid range is 16-4080 seconds. The value is
rounded to the next multiple of 16. The default
aging interval is 304 seconds.
priority lowestq|lowq|highq|highestq
Enter the priority queue.
ports number Enter the LAN port(s) associated with this MAC
address (0(MII) to 4).
Example The following example adds a static ARL entry to the forwarding database.
It maps a MAC address to port 3 and assigns its traffic to the highest
priority queue.
> config switch arl state static mac 00:80:2E:11:11:11
priority highestq ports 3