June 2003
Intermediate to advanced
504 pages
12h 29m
English
Content preview from MPLS and VPN Architectures, Volume IIBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Connectionless VPNs
Contrary to connection-oriented VPNs, connectionless VPNs propagate individual datagrams that the CE devices send across the P-network. This approach, although highly scalable as proven by today's Internet, does impose a number of limitations on the customers:
The customers can use only the Layer 3 protocol that the service provider supports. This was a serious drawback a few years ago, but it is quickly becoming a moot issue because most networking devices now support IPv4.
The customers must use addresses coordinated with the service provider. In a connectionless network, every P device must be able to forward every individual datagram to its final destination; therefore, each datagram must have a unique destination address, ...
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