六EIGRPOSPF.pptVIP

EIGRP Metrics Calculations When the K constants are set to default settings (recommended): Metric = [K1 x BW + ((K2 x BW) / (256 – load)) + K3 x delay] By default: K1 = 1, K2 = 0, K3 = 1, K4 = 0, K5 = 0 By default, EIGRP metric = BW [lowest link] + delay [sum of links]. BW = the lowest link-bandwidth along the path When K5 is changed to a value of 1 (not recommended): Metric = [K1 x BW + ((K2 x BW) / (256 – load)) + K3 x delay] * [K5 / (reliability + K4)]: K1 = 1, K2 = 0, K3 = 1, K4 = 0, K5 = 1 EIGRP Hello Timers Hellos sent once every 5 seconds on the following links: Broadcast media: Ethernet, Token Ring, Fiber Distributed Data Interface (FDDI) Point-to-point serial links: Point-to-point Protocol (PPP), High-Level Data Link Control (HDLC) Point-to-point subinterface: Frame Relay, ATM Multipoint circuits with bandwidth greater than T1: Switched Multimegabit Data Service (SMDS), Frame Relay, ATM, ISDN PRI Hellos sent once every 60 seconds on the following links: Multipoint circuits with bandwidth less than or equal to T1: ISDN BRI, Frame Relay, SMDS, ATM, and X.25 Hold time by default is three times the hello time EIGRP DUAL The DUAL finite state machine decision process is a follows: Tracks all routes advertised by neighbors Selects loop-free path using a successor and remembers any feasible successors If the successor is lost, uses a feasible successor If there is no feasible successor, queries neighbors and recomputes a new successor EIGRP Load Balancing Routes with a metric equal to the minimum metric are installed in the routing table (equal-cost load balancing). There can be up to six entries in the routing table for the same destination: The number of entries is configurable. The default is four. Set the routing table to one entry to disable load balancing. EIGRP Unequal-Cost Load Balancing EIGRP offers unequal-cost load balancing. Variance allows the router to include routes with a metric smaller than the multiplier times the minimum metric rou