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38 Cards in this Set
- Front
- Back
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EIGRP
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Enhanced Interior Gateway Routing Protocol
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What is Rapid Convergence?
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- Using link state analysis
- Better control of routing loop development |
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Goals of EIGRP
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1. Rapid Convergence
2. Efficiency in use of available bandwidth 3. Supports for VLSM 4. Support for CIDR and Hierarchical Addressing 5. Multiple Network Layer Support |
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What does multiple network layer support do?
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- Independence from routed protocls (can use IPv6, IPX, Appletalk, IP)
- Creates a separate database |
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What kind of routing protocol is rip?
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Distance Vector
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What is the hop count limit of RIP?
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15
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What is the hopr count limit of EIGRP?
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224
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What kind of routing protocol is EIGRP?
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link state
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How does Rip update the routing table?
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Uses periodic updates of the whole routing table
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How does EIGRP update the routing table?
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When changes occur and it only updates the changes, not the whole table
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When is the whole table sent in EIGRP?
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When a whole table is added.
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What command gets you into EIGRP mode?
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router eigrp 10
NOTE: 10 is the AS# |
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DUAl
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Diffusing Update Algorithm
- offers loop free routing - multiple variable metric: bandwidth + delay is default |
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EIGRP Technical Features
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- Neighbor discovery and recovery
- Reliable transport protocol (connection Oriented) - DUAL finite-state machine Diffusing Update Algorith |
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What happens when EIGRP forms neighbor adjacencies?
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- Dynamically lean of new routs that join their network
- Identify routers that become either unreachable or inoperable - Rediscover routers that had previously been unreachable |
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What command indicates an EIGRP route?
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show ip route
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What command shows network layer address per interface?
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show protocols
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What command shows routing protocols in use on which network?
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show ip protocol
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What command shows updates on the console for troubleshooting?
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debug ip eigrp
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In show ip route what is the D?
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D = Dual
Symbolizing the EIGRp algoritm |
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How does EIGRP Work?
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1. Discovers Neighbors
2. Build Topology 3. Build Routing Table |
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What is the EIGRP Metric Calculation
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[K1*bandwidth
+ (K2*bandwidth)/(256-load) + K3 * delay] + [K5 / (reliability + K4)] ________________________ =Metric NOTE: K1 and K3 are equal to 1 by default. Therefore bandwidth and delay are the only two variables used unless you manually change the K values |
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How do routers running EIFRP discover other EIGRP routers?
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- Hello packets are sent from all interfaces to 224.0.0.10
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What is the IP address hello packets are sent from in EIGRP?
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224.0.0.10
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When hello packets are sent the sending and receiving router are _________________?
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On the same Autonomous System
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How are adjacencies created?
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Adjacencies are created when two directly connected EIGRP neighbors find out that they:
1. Are both using EIGRP 2. Are both in the same Autonomous System |
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Once the Router Establishes adjacency in EIGRP what does it build?
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It builds a neighbor table
NOTE: This is one of the three main databases used by EIGRP |
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In order to form adjacency what must happen
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They must be on the same AS
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How can two EIGRP systems be connected?
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Using an exterior protocol like eBGP orby using static routes.
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What is in a topology table?
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The combined information about all available networks and all the different paths that can be used is called the topology table
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What must a router build before it can build a routing table in EIGRP?
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It must receive a topology table form its EIGRP neighbor(s)
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What is the P?
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Passive
It means the route is currently stable an reachable |
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What is FD?
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Feasible distance
Feasible distance is the best metric along the Path |
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What happens with the topology table?
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- A topology table exists for each configured network protocol such as TCP/IP
- The Dual Mathematical Algorithm is applied to the topology table |
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Is the topology the same on all routers?
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Yes
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What is a successor route?
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This is the best possible route to a specific network?
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What is reported distance?
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The metric it used to determine the cost of the rout is also sent.
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What is feasible successor
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Routers use redundant pathways to build a list of backup routes called feasible successor routes in case the successor route becomes unavailiable
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