qr code c# tutorial IPX, and AppleTalkThe DUAL algorithm is used to build a loop-free routing topology in Objective-C

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IPX, and AppleTalkThe DUAL algorithm is used to build a loop-free routing topology
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Unlike most distance vector routing protocols, EIGRP learns a partial topology of the network beyond its directly connected neighbor Like OSPF, EIGRP uses hello packets to discover and maintain neighbor relationships (stored in a neighbor table) and to share routing information (stored in the topology and routing tables) EIGRP uses the multicast address of 2240010 for the destination in its hello packets EIGRP generates hello packets every 5 seconds on LAN, point-to-point, and multipoint connections of at least T1/E1 speeds Otherwise, hellos are generated every 60 seconds The dead interval period is three times the hello interval
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EIGRP supports multicast and incremental updates Hello packets are generated every 5 seconds on LAN
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interfaces as multicasts (2240010) Hellos are used to maintain the EIGRP neighbor and the EIGRP topology tables in RAM
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For EIGRP routers to become neighbors, the following information must match in their hello packets:
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The autonomous system (AS) number The K-values (these enable/disable the different metric components used in
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the DUAL algorithm) Unlike OSPF, the hello and hold-down timers on the two routers do not need to match in order for the routers to become neighbors When two routers determine whether they will become neighbors, they go through the following process: 1 The first router generates a hello with its configuration information 2 If the configuration information matches (AS number and K-values), the second router responds with an Update message with its local topology information 3 The first router responds with an ACK message, acknowledging the receipt of the second s Update 4 The first router then sends its topology to the second router via an Update message 5 The second router responds with an ACK At this point, the two routers have converged This process differs from that of OSPF, where routing information is disseminated via a designated router With EIGRP, any router can share routing information with any other router As you can see from the preceding steps, EIGRP, like OSPF, is connection-oriented: certain EIGRP messages sent by a router will cause it to expect an acknowledgment (ACK) from the destination(s) Here are the message types for which an EIGRP router expects an ACK back:
Update Query Reply
Contains a routing update Asks a neighboring router to validate routing information Responds to a query message
If an EIGRP router doesn t receive an ACK from these three packet types, the router will try a total of 16 times to resend the information After this, the
21: EIGRP Routing
EIGRP has ve message types: hello, update, query, reply, and acknowledgment
router declares the neighbor dead When a router sends a hello packet, however, no corresponding ACK is expected in return
Choosing Routes
EIGRP can use the following metric components when choosing a route: bandwidth, delay, reliability, load, and MTU By default, however, only bandwidth and delay are activated (the MTU size, however, is exchanged between the peers, even though it s not used, by default) Bandwidth and delay are the K1 and K3 values Because bandwidth is used in EIGRP s metric computation, it is important that you match up this value correctly with the correct speed of your serial interfaces Cisco assumes that a serial interface is connected to a T1 connection, so if this is incorrect, use the bandwidth command to correct it (discussed in 16) Remember to put the bandwidth value in Kbps Table 21-1 explains important terms used by EIGRP
TABLE 21-1
Important EIGRP Terms
Term
Neighbor table
Definition
Contains a list of the EIGRP neighbors and is similar to the adjacencies that are built in OSPF between the designated router/backup DR and the other routers on a segment Each routed protocol (IP, IPX, and AppleTalk) for EIGRP has its own neighbor table Similar to OSPF s database, contains a list of all destinations and paths the EIGRP router learned it is basically a compilation of the neighboring routers routing tables A separate topology table exists for each routed protocol The best path to reach a destination within the topology table The best backup path to reach a destination within the topology table multiple successors can be feasible for a particular destination This is all of the successor routes from the topology table There is a separate routing table for each routed protocol The distance (metric) that a neighboring router is advertising for a specific route The distance (metric) that your router has computed to reach a specific route: the advertised distance from the neighboring router plus the local router s interface metric
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