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We explain the notion of software-defined networking (SDN), whose southbound interface may be implemented by the OpenFlow protocol. We describe the operation of OpenFlow and summarize the features of specification versions 1.0–1.4. We give an overview of existing SDN-based applications grouped by topic areas. Finally, we point out architectural design(More)
In this paper we propose the concept of an end-to-end (e2e) Self-Protecting Multi-Path (SPM) as a protection switching mechanism that may be implemented, e.g., in Multiprotocol Label Switching (MPLS) networks. In case of local outages, resilient networks redirect the traffic from a failed link over an e2e backup path to its destination. In this case,(More)
In this work we optimize administrative link costs of IP networks in such a way that the maximum utilization of all links is as low as possible for a set of considered failure scenarios (e.g., all single link failures). To that aim, we present the new "hill hopping" heuristic with three different variants and compare their computation times and the quality(More)
— The Locator/Identifier Separation Protocol (LISP) is a new routing architecture for the Internet that separates local and global routing. It offers more flexibility to edge networks and has the potential to reduce the growths of the BGP routing tables. Recently, a concept for mobility in LISP (LISP Mobile Node, LISP-MN) was presented. We analyze LISP-MN(More)
SUMMARY In this work we compare the efficiency of various routing and resilience mechanisms. Their path layout determines the utilization of links in the network under normal operation and in failure scenarios. For the comparison, the performance measure is the maximum utilization ρ S of all links for a set of protected failures S. A routing mechanism is(More)
—GLI-Split is a new addressing and routing architecture for the Internet. It splits the functionality of current IP addresses into a global locator, a local locator, and an identifier, and encodes them in IPv6 addresses. It implements the loca-tor/identifier split and makes routing in the core of the Internet more scalable. GLI-Split can be incrementally(More)
—The locator/identifier split is a design principle for new routing architectures that make Internet routing more scalable. To find the location of a host, it requires a mapping system that returns appropriate locators in response to map-requests for specific identifiers. In this paper, we propose FIRMS, a " Future Internet Routing Mapping System ". It is(More)
Precongestion notification (PCN) is a packet-marking technique for IP networks to notify egress nodes of a so-called PCN domain whether the traffic rate on some links exceeds certain configurable bounds. This feedback is used by decision points for admission control (AC) to block new flows when the traffic load is already high. PCN-based AC is simpler than(More)
—Admission control is a well known technique to explicitly admit or block new flows for a domain to keep its traffic load at a moderate level and to guarantee quality of service (QoS) for admitted flows. Flow termination is a new flow control function that terminates some admitted flows when the network capacity does not suffice, e.g., in case of unexpected(More)