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EIGRP
| Question | Answer |
|---|---|
| Multicast 224.0.0.9 | RIP |
| Multicast 224.0.0.5 | OSPF |
| Multicast 224.0.0.10 | EIGRP |
| EIGRP Benefits | Rapid Convergence, Multi-protocol support (IP, IPX, Appletalk), Supports Variable-Length Subnet Masking (VLSM) and Classless Inter-Domain Routing (CIDR) |
| EIGRP Draw back | Cisco proprietary |
| Hello Packets | Used to keep, establish, and maintain neighbor relationships (224.0.0.10) |
| Reliable Transport Protocol (RTP) | Used to handle the transport of messages between EIGRP enabled routers |
| EIGRP acts like a ____ protocol | Link State - when network topology changes occur, updates containing onlyt the change are sent, rather than the full routing table |
| Autonomuos systems | identify routers that belong to the same logical group. Routers outside the AS will not exchange routes, nor become neighbors |
| To establish a route in EIGRP | Recieve Hello packet from neighbor who has matching AS and metric weights (un-equal metrics = no neighbor relationship) |
| Metric weight | the level of importance EIGRP gives to the bandwidth, delay, load, and reliability metrics |
| Default EIGRP metrics used | bandwidth and delay |
| Once the neighbor relationship is established, it is the ___ that keeps it alive | hello packet |
| Successor | primary route |
| Feasible successor | backup route |
| EIGRP keeps 3 tables | Route , topology, neighbor |
| route table contains | best routes |
| topology table contains | successors(best routes) and feasible successors |
| Neighbor table contains | neighbors and information about them |
| EIGRP Feasible Successor Question | "Is the neighboring router's metric for this route lower than my metric?" If yes, and no loop present, route is a feasible successor. If not, a loop may be present and can not be FS |
| Diffusing Update Algorithm (DUAL) | issues queries to neighbors for a loop-free route to the destination. routers will keep sending queries to their neighbors until a route is found or no valid route is found |
| In an illustration, if speeds are vastly different | probably a question about hop count versus metrics |
| EIGRP and OSPF both use _____ masks | wildcard (not subnet)- EIGRP - optional, OSPF - manditory |
| Disable ___ by default | auto summarization command: no auto summary |
| Wildcard masks are simply | reverse subnet masks 0.0.0.255 the 0's are the care bits and 1's are the "I don't care bits" |
| Subnet Masks 255.0.0.0 | the 1's are the care bits and the 0's are the I don't care bits |
| D in a routing table | D=EIGRP route |
| Administrative Distance (AD) [90/xxxxxx] | Default, Connected route, Internal |
| Administrative Distance (AD) [170/xxxxxx] | External |
| EIGRP Equal-cost load balancing | Metric for 2 routes is the same, will balance traffic over both routes |
| Variance Command | a multiplier eg. 2 - successor metric 145 x 2 = 290, any route with metric less than 290 will be used in un-equal load balancing |
| Variance affects the ___ table | not just one route |
| Variance does not take affect until ____ | Clear routing table - command: clear ip route * |
| By default, EIGRP and RIP2 performs _____ | autosummarization - the act of summarizing network routes when those routes are sent across a network boundry. Turn this off. |
| Put no autosummarization on the routers doing the _____ | summarization |
| Adding no auto summary to an existing EIGRP will cause it to lose ____ | its adjacencies |
| If running EIGRP and not seeing the subnets or routes you expect... | look for the auto summary command in the configuration |
Created by:
smarks@prime-network