Ieee 802.3Ah Efm-Oam; Network Deployment Use Case - Brocade Communications Systems FastIron Administration Manual

IEEE 802.3ah EFM-OAM

Syntax: traceroute host-ip-addr [ maxttl value ] [ minttl value ] [ numeric ] [ timeout value ] [
source-ip ip-addr ]
Possible and default values are as follows.
minttl value - Minimum TTL (hops) value: Possible values are 1 through 255. Default value is 1
second.
maxttl value - Maximum TTL (hops) value: Possible values are 1 through 255. Default value is 30
seconds.
timeout value - Possible values are 1 through 120. Default value is 2 seconds.
numeric - Changes the display to list the devices by their IP addresses instead of their names.
source-ip ip-addr - Specifies an IP address to be used as the origin for the traceroute.

IEEE 802.3ah EFM-OAM

The IEEE 802.3ah Ethernet in the First Mile (EFM) standard specifies the protocols and Ethernet
interfaces for using Ethernet over access links as a first-mile technology.
Using the Ethernet in the First Mile solution, you will gain broadcast Internet access, in addition to
services, such as Layer 2 transparent LAN services, voice services over Ethernet Access networks,
and video and multicast applications, reinforced by security and Quality of Service control in order to
build a scalable network.
The in-band management specified by IEEE 802.3ah EFM standard defines the operations,
administration and maintenance (OAM) mechanism needed for the advanced monitoring and
maintenance of Ethernet links in the first mile. The OAM capabilities facilitate network operation and
troubleshooting. Basic 802.3 frames convey OAM data between two ends of the physical link. EFM-
OAM is optional and can be disabled on each physical port.
When OAM is present, two connected OAM sub-layers exchange protocol data units (OAMPDUs).
OAMPDUs are standard-size frames that can be sent at a maximum rate of 10 frames per second.
This limitation is necessary for reducing the impact on the usable bandwidth. It is possible to send
each frame several times in order to increase the probability of reception. A combination of the
destination MAC address, the Ethernet type/length field and subtype allow distinguishing OAMPDU
frames from other frames.
OAM functionality is designed to provide reliable service assurance mechanisms for both provider and
customer networks.

Network deployment use case

The data-link layer OAM is targeted at last-mile applications, and service providers can use it for
demarcation point OAM services.
Ethernet last-mile applications require robust infrastructure that is both passive and active. 802.3ah
OAM aims to solve validation and testing problems in such an infrastructure.
Using the Ethernet demarcation, service providers can additionally manage the remote device without
utilizing an IP layer. This can be done by using link-layer SNMP counters, request and reply, loopback
testing, and other techniques.
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