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  • #69803
    Wallis Dudhnath

    As we are now in the era of MSDC — Massive Scaleable Data Centers – have you looked at and deployed the following: TRILL (next generation Spanning Tables), LISP and VXLAN (overlay for L2 to a L3 Network). Keen to understand whether you had any issues with VM2VM2VM communication traversin L3 segments.

    VBR/ Wallis Dudhnath

    Wallis Dudhnath

    As inter Data Center communication is now a focus, especially with
    VM2VM2VM (Virtual Machine) communication between intra / inter LAN segments there is now
    a strong requirements for Layer 2 interconnections, e.g. tunneling L2 with L3 connection.

    Stretching Layer 2 domains between sites whilst achievable using Spanning-Tree has
    many disadvantages. Any broadcast flooding or spanning-tree flaps within
    one Data Center will propagate across to the other data centre. Transparent Interconnection
    of Lots of Links (TRILL), an IETF standard, is one approach that brings about an improvement with the traditional Spanning Tree Tables approach. This increases the flexibility as “redundant links” can be used in an intelligent way. Look at TRILL as a next generation Spanning Tree Tables.

    VXLAN – Virtual Extensible LAN – is a method of encapsulating L2 Ethernet frame within UDP with 50bytes of overhead. These encapsulated frames are “tunnelled” between the VEM’s (Virtual Ethernet Modules) attached to the VM(s).
    This allows VMs to communicate as if they belong to the same subnet.

    Traditionally an IP address is used to describe a devices
    Identity (ID) but also it’s location. If you move a device to a
    different site then you must change it’s IP in order to match it’s new location.
    LISP – Location ID/Separation protocol – attempts to separate the location
    and ID so that a device can change location whilst keeping the same identity.

    The above (TRILL, VXLAN and LISP) will help organisations to create MSDCs by supporting
    L2/L3 tunneling, movement of devices in a flexible way and supporting seamless VM2VM communication.

    VBR/ Wallis Dudhnath

Viewing 2 posts - 1 through 2 (of 2 total)
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