Резервирование L2

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LAG

LAcP

MLAG

UDLD

BFD

Fate Sharing

The underlying assumption is simple: if the routing protocol manages to exchange information between adjacent nodes, there won’t be any problems with the user traffic. Furthermore, if the routing protocol updates in a distance vector protocol made it from egress router to ingress router, the traffic should experience no problems when being sent in the reverse direction. http://blog.ipspace.net/2014/08/fate-sharing-in-ip-networks.html