4
New-generation Protocols
Protocols are currently undergoing numerous mutations, owing to
the advent of the Cloud and of SDN architectures. The legacy
protocols based on routing of IP packets and MPLS (MultiProtocol
Label Switching) are still in place for the connection of users or data
transport, offered by the major operator networks. However, an
entirely new generation of networks is emerging and fighting to earn a
place in the new arsenal of operators and Cloud providers. Firstly,
there are the networks within datacenters, which must provide a very
fast link between the servers, of which there are thousands, or even
tens or hundreds of thousands. The protocol cited most at present is
TRILL (Transparent Interconnection of Lots of Links). TRILL is a
level-2 Ethernet network with extensions to facilitate routing in a
level-2 Ethernet environment. Very broadly speaking, we can qualify
TRILL as an Ethernet network encapsulated within an Ethernet
network, enabling us to have a hierarchy of addresses and to carry out
routing. We shall come back to this later on.
Then, there are inter-datacenter networks, which also carry
enormous quantities of data, going from one sub-network to another
sub-network. There are a certain number of possibilities that are
mentioned in the literature and are found in reality with Cloud
management providers. In general, they are extensions of VLAN
(Virtual LAN) techniques to maintain consistent VLAN numbers,
even when the datacenters are not in the same sub-networks. In
addition, the number of VLANs is limited by numbering zone, which
Software Networks: Virtualization, SDN, 5G and Security, First Edition. Guy Pujolle.
© ISTE Ltd 2015. Published by ISTE Ltd and John Wiley & Sons, Inc.
www.it-ebooks.info
New-generation Protocols
Protocols are currently undergoing numerous mutations, owing to
the advent of the Cloud and of SDN architectures. The legacy
protocols based on routing of IP packets and MPLS (MultiProtocol
Label Switching) are still in place for the connection of users or data
transport, offered by the major operator networks. However, an
entirely new generation of networks is emerging and fighting to earn a
place in the new arsenal of operators and Cloud providers. Firstly,
there are the networks within datacenters, which must provide a very
fast link between the servers, of which there are thousands, or even
tens or hundreds of thousands. The protocol cited most at present is
TRILL (Transparent Interconnection of Lots of Links). TRILL is a
level-2 Ethernet network with extensions to facilitate routing in a
level-2 Ethernet environment. Very broadly speaking, we can qualify
TRILL as an Ethernet network encapsulated within an Ethernet
network, enabling us to have a hierarchy of addresses and to carry out
routing. We shall come back to this later on.
Then, there are inter-datacenter networks, which also carry
enormous quantities of data, going from one sub-network to another
sub-network. There are a certain number of possibilities that are
mentioned in the literature and are found in reality with Cloud
management providers. In general, they are extensions of VLAN
(Virtual LAN) techniques to maintain consistent VLAN numbers,
even when the datacenters are not in the same sub-networks. In
addition, the number of VLANs is limited by numbering zone, which
Software Networks: Virtualization, SDN, 5G and Security, First Edition. Guy Pujolle.
© ISTE Ltd 2015. Published by ISTE Ltd and John Wiley & Sons, Inc.
www.it-ebooks.info