Interaction With Other Features; System; Lldp; Lacp - OmniSwitch os6900 Network Configuration Manual

Configuring Dynamic Automatic Fabric

Interaction with Other Features

This section contains important information about how other OmniSwitch features interact with the auto-
fabric feature. Refer to the specific chapter for each feature to get more detailed information about how to
configure and use the feature.

System

•
When the Auto-Fabric feature is enabled there may be periodic changes to the switch configuration.
This will cause the Running Configuration to display as "NOT SYNCHRONIZED" even after manu-
ally synchronizing CMMs.

LLDP

•
LLDP has been enhanced to detect peer device ports connected on boot up using a proprietary TLV
and LLDP PDU exchanges. LLDP discovery will help to detect a set of ports connected to a neighbor
device so that a link aggregation can be formed on the detected set of ports if LACP negotiation
succeeds.
•
If a port is brought up after auto-fabric has run and auto fabric is enabled on that port, LLDP exchanges
are used to determine if the port is connected to the same device so that the already connected port and
and subsequent new ports can form an aggregation.

LACP

•
Neighbor is already configured with LACP - Linkagg will detect LACP PDUs on the ports and map
them to different neighbor devices based on admin key, system-id and priority received in the PDUs.
This allows an auto fabric enabled port to join an already formed aggregate or a new aggregate id.
•
Neighbor device is also booting up with this device (Max aggregate size not exceeded) - If there
are fewer ports than the maximum possible size of an aggregate then all ports are chosen and an aggre-
gate is formed.
•
Neighbor device is also booting up with this device (Max aggregate size exceeded) - Connecting
more ports than is supported for a link aggregate is not supported. The number of physical connections
should not be greater than the maximum number of link aggregate ports supported for the OmniSwitch.
•
Device is already up and new port comes up - In this case the device might already have a port/
aggregate which is connected to same neighbor device, then the port joins the aggregate which is
already formed or both ports will form a new aggregate.
•
If a LACP frame is received on a non-aggregate port with auto-fabric enabled, auto-fabric discovery
window is started provided no SPB-M adjacencies are formed and there are no MVRP registrations.
•
LACP auto discovery will work between a configured switch and an auto-discovery enabled switch by
the auto discovery switch analyzing the LACP PDUs received from the configured switch. An auto
discovery switch in this scenario will place all of the ports from the same switch with the same remote
admin key into the same link agg.
•
An auto discovery switch will be able to learn and configure LACP link-aggs from any 802.3AD
compliant and already configured bridge.
•
LACP link-aggs will be able to be configured between any two auto discovery switches by exchanging
custom LLDP PDUs with TLVs specific to AOS. This exchange will be necessary to determine an
OmniSwitch AOS Release 7 Network Configuration Guide June 2013
Interaction with Other Features
page 14-11