A gigabit path may only have access to a 100 Mbps path to
use as an alternate. This may not be acceptable for mission-critical data.
?– Performance monitoring Ethernet does not offer sophisticated performance
monitoring, making a geographically diverse Ethernet MAN difficult to manage in
failure scenarios. The lack of good fault isolation mechanisms (such as SONET LOS
alarms) makes it difficult to pinpoint failures in the network. This may be acceptable
in the case of a LAN located in a controlled environment, but fault isolation
becomes critical if the network is leased and extends across a metropolitan area.
Circuit bonding can be used to overcome some of these limitations. By using circuit bonding
to transport Ethernet (either over SONET or copper facilities), the well-established,
carrier-class standards of protection equivalent to those offered by SONET are available.
While other solutions exist to carry Ethernet over SONET, only circuit bonding offers full
transparency and efficient transport.
Circuit bonding supports line-side M:N protection. This allows the clients to share
the bandwidth of multiple parallel line-side connections and also use some of these
lines as active, load-sharing ???standby??? facilities.
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