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Distributed SS7 stack from Aricent provides a highly
fault tolerant and scalable implementation of the SS7 protocol.
Aricent DSS7 stack enables OEMs to meet stringent reliability
and performance requirements demanded by Network Operators.
The SS7 stack instances can be run on distributed nodes in
load sharing mode for handling heavy traffic. A new node can
be added at run time to scale up the system without bringing
down the rest of the nodes resulting in highly scaleable system.
The load is distributed across all the instances and in case
one of the stack instance goes down, the system automatically
redistributes the load across the remaining instances. When
the failed instance recovers, it also becomes a part of the
distributed system. Information amongst various instances
is exchanged to ensure a consistent and updated database.
Various features of the distributed SS7 stack are:
- Fault Resilient: In the event of failure of one
instance, the other instances continue working, i.e., the
impact of failure of an instance is minimal from the point
of view of the stack users and the peer nodes on the network.
However existing contexts with that instance will be lost.
- Load balancing: The load from the user part and
external world is distributed among multiple instances of
stack evenly. If an instance fails or a new instance comes
up, the load is redistributed and this redistribution is
preformed without interrupting the ongoing operations.
- Unified View: The stack provides a unified view
to the network and user part. The network nodes are transparent
to the distribution at the distributed node and view the
distributed nodes as a single node only.
- Minimum cross Traffic: The cross traffic is avoided
between different instances of the stack as far as possible.
- Highly Scalable: Provides capability of addition
and deletion of stack instances dynamically at run time.
To know more about Aricent SS7 Stack, browse through the SS7
FAQ.
The distribution in the Aricent SS7 stack is achieved with the
help of three entities –
- Downstream Message Router (DMR) library
- Upstream Message Router (UMR) library and
- Health Manager
The design is kept to have a minimum impact in the core functionality
of individual layers.
Every stack layer is associated with two distribution libraries,
known as Upstream Message Router (UMR) and a Downstream Message
Router (DMR).
The DMR library functionality invoked by distributed stack
instance user, is used to distribute traffic to the various
lower stack instances.
The Upstream Message Router is used to distribute the messages
coming from the network to various stack instances
The algorithm used in DMR and UMR libraries for distribution
is configurable.
Health Manager takes care of monitoring the status of various
stack instances and coordinating proper functioning of distributed
stack. This Health Manager also keeps track of any new instances
added in the system as well as instance failure and reports
status change to all other stack instances.
Distributed SS7 Stack
In the figure above for the Nth Layer, UMR Library linked
with Nth layer is the Message router library that will route
the message to appropriate instance of n+1 layer. Similarly
DMR Library linked with Nth layer will send the message to
the appropriate N-1th instance.
Last updated : March 17, 2006
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