CTC Union FRM220-100AS-1, Руководство пользователя

Страница: 47 / 83

47
CHAPTER 3
PROVISIONING VIA TEXT MENU
3.6.7 MAC Learning Function
This feature allows turning off the MAC learning function of the store & forward switch for special
applications or for testing. From the main menu page, select the
<L> Local Status and
Configuration . Select the <D> Device Status and Configuration menu item. Then select <1> MAC
Learning Function .
3.7 OAM Configuration
Ethernet in the First Mile ( EFM ) is the nickname of IEEE Std 802.3ah-2004, an amendment to the
Ethernet standard, specifying "Media Access Control Parameters, Physical Layers, and
Management Parameters for Subscriber Access Networks". The EFM standard was approved by
the IEEE Standards Board in June 2004, and officially published on September 7, 2004. In 2005 it
was included into the base IEEE 802.3 standard.
The "Last Mile" is the name traditionally given to the part of a public communication network that
links the last provider-owned node (the central office, the street cabinet or pole) with the
customer premises equipment (CPE). The "First Mile" is the exact same thing, viewed from the
customer's perspective.
IEEE 802.3ah
OAM (Operations, Administration, Maintenance) specification covers the OAM
frames used across a physical IEEE 802.3 medium between a Provider and a Customer, or perhaps
between two Provider ports or two Customer ports. In
100AS-1 product, OAM refers to the frames
sent between units on a fiber link. OAM is NOT forwarded over links.
Ethernet
OAM is complementary, not competitive, with SNMP (Simple Network Management
Protocol) management in that it provides some basic management functions at layer two, rather
than using layer three and above as required by SNMP over an IP infrastructure. Ethernet OAM
provides single-hop functionality in that it works only between two directly connected Ethernet
stations. SNMP can be used to manage the Ethernet OAM interactions of one Ethernet station
with another.
3.7.1 OAM PDU frame size
OAM PDU frames must be within the legal Ethernet frame size range of 64 to 1518 bytes. OAM
frames MUST be untagged. The maximum transmit rate of OAM PDU frames is 10 per second. In
an OAM pair, only the 'Active' unit needs to set the frame size. The 'Passive' OAM unit will
negotiate and follow the 'Active' unit during
OAM Discovery . The default and recommended OAM
PDU size is 1500 bytes. The active and passive units must have the same OAM frame size.
Set MAC Learning Function.
<0> Disable <1> Enable
<ESC>:Previous Menu.