A Local Approach to Fast Failure Recovery of LISP Ingress Tunnel Routers

Mon, 04/23/2012 - 22:23 by Damien Saucez


LISP (Locator/ID Separation Protocol) has been proposed as a future Internet
architecture in order to solve the scalability issues the current architecture
is facing. LISP tunnels packets between border routers, which are the
locators of the non-globally routable identifiers associated to end-hosts. In
this context, the encapsulating routers, which are called Ingress Tunnel
Routers (ITR) and learn dynamically identifier-to-locators mappings needed for
the encapsulation, can cause severe and long lasting traffic disruption upon
failure. In this paper, thanks to real traffic traces, we first explore the
impact of ITR failures on ongoing traffic. Our measurements confirm that the
failure of an ITR can have severe impact on traffic. We then propose and
evaluate an ITR synchronization mechanism to locally protect ITRs, achieving
disruptionless traffic redirection. We finally explore how to minimize the
number of ITRs to synchronize in large networks.

Damien Saucez, Juhoon Kim, Luigi Iannone, Olivier Bonaventure and Clarence Filsfils
IFIP Networking 2012, 2012.
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