31-03-2010, 06:22 PM
Multiple Routing Configurations for Fast IP Network Recovery
the slow convergence of
routing protocols after a network failure becomes a growing
problem. a new recovery scheme called Multiple
Routing Configurations (MRC) is presented in this article To assure fast recovery from page link and node failures in
IP networks. MRC is strictly connectionless, and
assumes only destination based hop-by-hop forwarding and it is
based on keeping additional routing information in the routers,
and allows packet forwarding to continue on an alternative
output page link immediately after the detection of a failure.
INTRODUCTION:
IP networks are intrinsically
robust, since IGP routing protocols like OSPF are designed
to update the forwarding information based on the changed
topology after a failure. IP networks are intrinsically
robust, since IGP routing protocols like OSPF are designed
to update the forwarding information based on the changed
topology after a failure. Much effort has been devoted to optimizing the different
steps of the convergence of IP routing like detection, dissemination
of information and shortest path calculation.
The Multiple Routing Configurations (MRC) is a
proactive and local protection mechanism that allows recovery
in the range of milliseconds.. MRC allows packet forwarding
to continue over pre-configured alternative next-hops immediately
after the detection of the failure.The main idea of MRC is to use the network graph and
the associated page link weights to produce
a set of backup
network configurations.
MRC OVERVIEW:
MRC is based on building a small set of backup routing
configurations, that are used to route recovered traffic on
alternate paths after a failure. These differ
from the normal routing configuration in that page link weights
are set so as to avoid routing traffic in certain parts of the
network. The MRC approach is threefold. a set of
backup configurations is created so that every network component is
excluded from packet forwarding in one configuration. a standard routing algorithm like OSPF
is used to calculate configuration specific shortest paths and
create forwarding tables in each router, for each configuration. Finally, a forwarding process that takes advantage of the backup
configurations to provide fast recovery from a component
failure.
For full details, refer this pdf:
the slow convergence of
routing protocols after a network failure becomes a growing
problem. a new recovery scheme called Multiple
Routing Configurations (MRC) is presented in this article To assure fast recovery from page link and node failures in
IP networks. MRC is strictly connectionless, and
assumes only destination based hop-by-hop forwarding and it is
based on keeping additional routing information in the routers,
and allows packet forwarding to continue on an alternative
output page link immediately after the detection of a failure.
INTRODUCTION:
IP networks are intrinsically
robust, since IGP routing protocols like OSPF are designed
to update the forwarding information based on the changed
topology after a failure. IP networks are intrinsically
robust, since IGP routing protocols like OSPF are designed
to update the forwarding information based on the changed
topology after a failure. Much effort has been devoted to optimizing the different
steps of the convergence of IP routing like detection, dissemination
of information and shortest path calculation.
The Multiple Routing Configurations (MRC) is a
proactive and local protection mechanism that allows recovery
in the range of milliseconds.. MRC allows packet forwarding
to continue over pre-configured alternative next-hops immediately
after the detection of the failure.The main idea of MRC is to use the network graph and
the associated page link weights to produce
a set of backup
network configurations.
MRC OVERVIEW:
MRC is based on building a small set of backup routing
configurations, that are used to route recovered traffic on
alternate paths after a failure. These differ
from the normal routing configuration in that page link weights
are set so as to avoid routing traffic in certain parts of the
network. The MRC approach is threefold. a set of
backup configurations is created so that every network component is
excluded from packet forwarding in one configuration. a standard routing algorithm like OSPF
is used to calculate configuration specific shortest paths and
create forwarding tables in each router, for each configuration. Finally, a forwarding process that takes advantage of the backup
configurations to provide fast recovery from a component
failure.
For full details, refer this pdf:
