Mac Purge - Alcatel-Lucent 7750 SR OS Service Manual

OAM and SAA
then responded to by populating the MAC address in the forwarding plane, like a conventional
learn although the MAC will be an OAM-type MAC in the FIB to distinguish it from customer
MAC addresses.
This packet is then taken by the control plane and flooded out the flooding domain (squelching
appropriately, the sender and other paths that would be squelched in a typical flood).
This controlled population of the FIB is very important to manage the expected results of an OAM
test.
The same functions are available by sending the OAM packet as a UDP/IP OAM packet. It is then
forwarded to each hop and the management plane has to do the flooding.
Options for MAC Populate are to force the MAC in the table to type OAM (in case it already
existed as dynamic or static or an OAM induced learning with some other binding), to prevent
new dynamic learning to over-write the existing OAM MAC entry, to allow customer packets with
this MAC to either ingress or egress the network, while still using the OAM MAC entry.
Finally, an option to flood the MAC Populate request causes each upstream node to learn the
MAC (i.e., populate the local FIB with an OAM MAC entry), and to flood the request along the
data plane using the flooding domain.
An age can be provided to age a particular OAM MAC after a different interval than other MACs
in a FIB.

MAC Purge

MAC Purge is used to clear the FIBs of any learned information for a particular MAC address.
This allows one to do a controlled OAM test without learning induced by customer packets. In
addition to clearing the FIB of a particular MAC address, the purge can also indicate to the control
plane not to allow further learning from customer packets. This allows the FIB to be clean, and be
populated only via a MAC Populate.
MAC Purge follows the same flooding mechanism as the MAC Populate.
A UDP/IP version of this command is also available that does not follow the forwarding notion of
the flooding domain, but the control plane notion of it.
7750 SR OS Services Guide Page 1373