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Eigrp Cheatsheet - EIGRP in 15 min - Rishabh Dangwal - www.theprohack.com

Eigrp Cheatsheet - EIGRP in 15 min - Rishabh Dangwal - www.theprohack.com



A quick guide to Cisco's EIGRP .

A quick guide to Cisco's EIGRP .



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    Eigrp Cheatsheet - EIGRP in 15 min - Rishabh Dangwal - www.theprohack.com Eigrp Cheatsheet - EIGRP in 15 min - Rishabh Dangwal - www.theprohack.com Document Transcript

    • - EIGRP - 15 min theory cheat sheet -RISHABH DANGWAL-  Name: Enhanced Interior Gateway Routing Protocol Standard: Cisco Proprietary  Supported Protocols: IP, IPX, Appletalk Transport Protocol: IP  Routing Protocol Type: Hybrid Algorithm: DUAL  Internal AD: 90 External AD: 170  Route Summarization: Yes (auto by default) RTP: Reliable Transport Protocol  EIGRP Load Balancing : default 4, Max 6 Hop Count: default 100, max 255  Neighbour Discovery: Auto (multicast/unicast) Multicast IP:  Hello Timers: 5 seconds (high speed links) ,60 seconds (wan links 1.5mb and lower)  Dead Timers: 15 seconds (high speed links) ,180 seconds (wan links 1.5mb and lower)Terms  Feasible Distance (FD): Metric based on local route to destination metric  Reported Distance (RD): Metric based on the neighbours metric to the destination metric  Successor : Lowest FD to the destination  Feasible Successor (FS): Backup to destination if feasibility condition is met  Feasibility Condition: If a non-successor route’s RD is less than the FD, the route is a FSRoute States  Passive State: Route is reachable Active State: Unreachable, no FS exitsEIGRP Protocol Messages  HELLO,UPDATE (sent reliably via RTP),QUERY (sent reliably via RTP),REPLY (sent reliably via RTP), ACK (acknowledgement)METRICS  K Metrics: (K1)Bandwidth, (K2)Load, (K3)Delay, (K4)Reliability & (K5)MTU  Default Metric: Metric = 256 * ((10^7 / lowest bandwidth in path) + Cumulative Delay)  Full K weights: Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + K3*Delay)*(K5/(Reliability + K4)))Stuck in ActiveDuring active state, when an EIGRP speaking router doesn’t gets an EIGRP reply to a query within 3min, the route will become stuck in active (SIA), neighbour relationship is reset and learningprocess will start again. In IOS version 12.2 or higher, after 90 seconds a second SIA message issent as SIA Query which helps to prevent the route from going SIA in case the neighbour relationshipis still up but a response was not received. To avoid it (generally), either use Passive Interfaces,Stubs or Summarise properly.EIGRP Stub Options  Connected: Advertise connected routes for interfaces matched with the network command  Summary: Advertise auto-summarized or manually configured summary routes  Redistributed: Advertise routes learned from configured redistribution  Receive-only: No routes are advertised  Static: Advertise static routes but must be used with the “redistribute static” command Please send feedback at admin@theprohack.com www.theprohack.com