1ad) or a backbone
bridge (802.1ah) network?
?– Does the bridged network provide the foundation for other services, e.g., IP, L3VPN,
MPLS, Frame Relay? Does it work in parallel with those services on a separate
physical infrastructure, does it work in parallel on the same infrastructure in a
???ships in the night??? fashion, or does it float on top of those services that it bridges
switching MAC addresses over virtual Ethernet links?
?– What sort of redundancy and reliability features are required for this configuration?
(Does the provider want redundant forwarding engines in every box, multiple
boxes without redundancy within the box, or both?)
And of course, most importantly:
?– What sort of deal can the provider strike with the vendor, based on quantity and/or
other considerations?
Some representative numbers are shown in Table 13.1 for three classes of provider
bridges. These numbers are for high-end equipment with redundancy and routing capabilities.
In Table 13.1, ???LH??? refers to long-haul (fiber) ports and ???SH??? to short-haul
(copper) ports.
A typical provider bridge supporting nine 1 Gbit/sec long-haul links, with essentially
all of the features described in this chapter for a provider bridge network, can be obtained
for approximately $71,000.
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