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Packet Voice Processor Commands Manual
10.6 Link
Aggregation
Group Commands
Link Aggregation Groups (LAGs) are logical groupings of Gigbit Ethernet ports. Link
aggregation, defined in IEEE standard 802.3ad, is a method where multiple physical
links are combined into a single logical link. This provides the following important
features: increased link capacity and redundancy.
Link aggregation provides both data flow distribution (transmit) from the Packet Voice
Processor and data flow collection (receive) to the Packet Voice Processor. Transmit
and receive data flows occur across the LAG ports within each provisioned LAG.
With an upper bound of 4 links in a LAG, link aggregation with Gigabit Ethernet can
provide a single logical link capable of achieving an aggregate theoretical 4 Gbit/s in
each direction with full duplex operation. Link aggregation does not modify the 802.3
frame structure. Link aggregation is also completely transparent to all upper-layer
protocols. The Packet Voice Processor supports up to four static LAGs.
10.6.1 Static LAG
The Packet Voice Processor supports a Static LACP mode for the LAG configuration.
The Static LACP Mode does not require the Packet Voice Processor to negotiate with
other partner devices (connected to the Packet Voice Processor) to determine the
LAG port state. An example of a Packet Voice Processor using Static LACP Mode is
where the partner devices to the Packet Voice Processor were running Cisco
Etherchannel or PAgP. These partner devices are configured in a non-negotiable
mode for them to interoperate with the Packet Voice Processor.
10.6.2 Card Redundancy
Link Aggregation Groups (LAGs) also provide Interface Processing card redundancy
within a Packet Voice Processor system. For example, after creating 4 separate LAG
groups on the 2 Interface Processing cards in Packet Voice Processor shelf slots 4
and 6 (see
), if one of the Interface Processing card fails
(i.e., the card in slot 4), the other card will still be active. This active card will continue
to transmit and receive IP packets.
Содержание Packet Voice Processor
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