Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Руководство по настройке

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page 241 shows the interconnection between OAM and LAG bundles. You can use
the results of OAM link monitoring to configure the LAG sublayer accordingly to
improve failover and recovery times.
Figure 33: Interrelationship Between 802.3ah OAM and 802.3ad LAG
g016522
.3ad LAG
MAC data
MAC data OAM Service Interface
OAM Client
802.3ah OAM
MAC Control
MAC
PHY
802.3ah OAM
MAC Control
MAC
PHY
802.3ah OAM
MAC Control
MAC
PHY
MAC Client
Link events can be generated locally using the health monitoring of an Ethernet link.
These link events can be supplied to the link aggregation multiplexing logic, in addition
to the logic generated by the LAC protocol. For example, if the configured
symbol-period threshold is exceeded, you can configure the link aggregator to remove
the member link from the bundle and rebalance the bundle. Where a LAG member
link is designated as a redundant member, you can use the link monitor functionality
to trigger the failover and the reversal of the link.
Certain line module and IOA combinations support physical level redundancy. The
redundancy feature enables a primary Gigabit Ethernet link to fail over to the
secondary link without signaling higher-layer protocols and by maintaining the same
MAC address on the link. The preservation of the same MAC address on the link also
retains bindings to the MAC address (for example, ARP entries). When the OAM
entity signals that a health monitoring threshold is exceeded, the event can trigger
the failover to the secondary link.
JUNOSe Software implements the Marker Responder segment of the Marker protocol.
If the OAM entity signals a link event, such as the exceeding of a high threshold
value, using the health monitoring system, then Marker Response PDUs are not sent
in such circumstances.
Related Topics
■
OAM Feature Overview on page 234
■
OAM Elements Overview on page 231
■
Configuring 802.3ah OAM Link-Fault Management on page 242
■
Guidelines for Configuring 802.3ah OAM Link-Fault Management on page 242
Interrelationship of OAM Link-Fault Management with Ethernet Subsystems
■ 241
Chapter 7: Configuring IEEE 802.3ah OAM Link-Fault Management