Version 6.6 191 October 2014
Installation & Operation Manual 26. Connecting the Media Gateway to the IP Network
26.2.6 Media Link Aggregation
The Mediant 8000 uses 1 Gb Ethernet copper ports for connection to IP networks.
When five or more TP-6310 or TP-8410 Media Gateway boards are installed in the
chassis, the volume of the generated Media traffic may exceed the capacity of a single
1 Gb Ethernet port. Under such circumstances, link aggregation is supported.
Link aggregation allows up to three physical ports to be aggregated together to form a
Link Aggregation Group. This aggregation can then function as if it were a single link,
which means that constituent links that would otherwise be blocked as redundant by
the Spanning Tree can continue providing increased link capacity. Link Aggregation
implementation fully conforms to the IEEE 802.3ad specification.
26.2.6.1 Benefits
By taking multiple LAN connections and treating them as a single, aggregated link, the
following benefits may be achieved:
Increased link capacity:The total capacity of the aggregated links is the sum of
the capacities of the individual links composing the aggregate.
Higher link availability: A properly designed link aggregation scheme will
prevent the failure of any single component link from disrupting communication
between the interconnected devices. For the Mediant 8000, this additional link
availability supplements the regular failover between the redundant links
connected to both ES boards.
26.2.6.2 Distribution Rules
The Mediant 8000 supports six different rules for distributing the traffic across the
aggregated links. All rules are based on analysis of the specific three bits of the IP
packets generated by the Mediant 8000 and must be configured according to the
specific details of the IP network to which the Mediant 8000 is connected.
For example, when the Source IP distribution rule is configured and two aggregation
links are available, packets originating from IP addresses 10.7.1.9 (last three bits 001)
and 10.7.1.19 (last three bits 011) will be sent via the first aggregated link, while
packets originating from IP addresses 10.7.1.2 (last three bits 010) and 10.7.1.24 (last
three bits 000) will be sent via the second aggregated link.
The distribution algorithm for three aggregated links uses proprietary hash-based
algorithms to determine links to be used. The algorithm is not configurable by the user;
however, ensures that for evenly distributed IP addresses, traffic will be evenly
distributed across aggregated links.
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