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STATE REDUCTION IN THE INTERCONNECTION OF BGP EVPN HOST ROUTED DOMAINS INTER DOMAIN ROUTE DISTRIBUTION SCALING WITH OPTIMAL FORWARDING PATHS AND MECHANISM FOR HANDLING MAC MOBILITY IN NETWORKS WITH DEFAULT GATEWAYS

IP.com Disclosure Number: IPCOM000244032D
Publication Date: 2015-Nov-05

Publishing Venue

The IP.com Prior Art Database

Related People

Victor Moreno: AUTHOR [+9]

Abstract

Three separate but related methods are presented that address a problem of mobility state changes in data center networks A first method is provided for the elimination of any remote state created by the transmission of mobility state changes between host routing domains This method maintains the state and changes within a domain to a minimum by only allowing relevant remote move events to be temporarily signaled into the domain during re convergence moves and reverting to default routing in the steady state In a second method an automated protocol based mechanism is provided to achieve the dual purposes of control forwarding plane scale with aggregation and event driven routing action route leaking to achieve optimal forwarding paths in the presence of VM mobility A third method provides for handling Media Access Control MAC mobility in EVPN in the case of route summarization by momentarily leaking host routes to trigger control plane convergence This enables network scalability by allowing MAC mobility to be handled even in the case of route summarization

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  STATE REDUCTION IN THE INTERCONNECTION OF BGP-EVPN HOST ROUTED DOMAINS, INTER-DOMAIN ROUTE DISTRIBUTION SCALING WITH OPTIMAL FORWARDING PATHS, AND MECHANISM FOR HANDLING MAC MOBILITY IN NETWORKS WITH DEFAULT GATEWAYS

AUTHORS:

 Victor Moreno Isidoros Kouvelas Samir Thoria Dhananjaya Rao

    Y f Siu Sachin Karisiddappa Samer Salam

Ali Sajassi Keyur Patel

CISCO SYSTEMS, INC.

ABSTRACT

    Three separate but related methods are presented that address a problem of mobility state changes in data center networks. A first method is provided for the elimination of any remote state created by the transmission of mobility state changes between host routing domains. This method maintains the state and changes within a domain to a minimum by only allowing relevant remote move events to be temporarily signaled into the domain during re-convergence/moves and reverting to default routing in the steady state. In a second method, an automated protocol based mechanism is provided to achieve the dual purposes of control/forwarding plane scale with aggregation, and event-driven routing action (route leaking) to achieve optimal forwarding paths in the presence of VM mobility. A third method provides for handling Media Access Control (MAC) mobility in EVPN in the case of route summarization by momentarily leaking host routes to trigger control-plane convergence. This enables network scalability by allowing MAC mobility to be handled even in the case of route summarization.

Copyright 2015 Cisco Systems, Inc.

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DETAILED DESCRIPTION

    1. State Reduction in the Interconnection of BGP-EVPN Host Routed Domains Data Center fabrics supporting mobility handle non-summarizable host level information in their control planes. To this effect the control planes include mobility semantics that allow for the effective signaling of move events to trigger any necessary route withdrawals or state clean-up. Current implementations of these mobility mechanisms exist in Multi-Protocol-Border Gateway Protocol (MP-BGP) both in the Internet Protocol Virtual Private Network (IPVPN) and Ethernet Virtual Private Network (EVPN) address families.

    As multiple fabrics are interconnected, extending the control plane across fabrics is necessary in order to support the necessary signaling for host moves to complete. Extending the host based control plane across fabrics causes an explosion in the amount of state that every top of rack switch must maintain.

    Every top of rack switch would have to hold state for every host in the local fabric as well as every host connected to a remote fabric. This makes it very difficult to properly plan the capacity of a data center fabric and limits the ability to scale out data center capacity by adding new sites.

    According to a first aspect, a method is provided for the concealment of remote state while still allowing the necessary mobility signaling to be exchanged between sites.

    A method is provided to relay mobility state changes across disjoint...