bgp

• Russ's course on OE
• as - set of equipment under one organization's control
• as 1 - 65 535 - 16 bit space
• 64 512 - 65 534 - private as s
• dotted notation are more compact - 65 536 = 1.0; a.b, a x 65 536 + b
• nlri = network layer reachibility information ~ route
• as path is not the traffic path, it just ensures loop freens
• bgp connects networks/as s, not routers; that's why there's no loop prevention in ibgp
• customer/transit routes vs infra(structure) routes
• confed(eration) - deprecated cause too complex and doesn't scale
• rr = route reflector
• hierarchical rr
• cluster list in ibgp ~ as path in ebgp
• rs = route server - reflects routes to clients; place of policy management
• ix[p] = internet exchange [point]
• mrai = minimum route advertisement interval - typically 30 sec
• igp almost always converges faster (rarely equal) than bgp
• bgp best path selection is more of a heuristic than algorithm cause different results depending on the when the routes are pushed into the process
• tcp 179
• fast fallover - if the interface fails, it assumes the bgp session also fails
• afi = address family identifier, safi = subsequent afi
• dampening should not be used in the dfz; it slows convergence
• attribute transitivity - is it transfered over ebgp
• cold potato routing - keep the traffic inside the network as long as possible to have more control or to have the traffic delivered directly to the customer
• hot potato routing - closest exit point
• local policy overrides global
• as path poisoning - prepending else's as
• vfr = valley free routing - not routing transit traffic over edge as
• rpf = reverse path forwarding (strict/loose)
• bgp was initially designed for high trust environment