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ROUTING

·  Term routing is used for taking a packet from one device and sending it through the network to another device on a different network.

·  Router  don’t really care about hosts they only care about networks and the best path to each network.

ROUTING PROTOCLOS IN COMPUTER NETWORKS

There are three classes of routing protocols

· Distance vector protocol :the distance vector protocols find the best path to remote network by judging distance. Exp. RIP

· Link state protocol:  also called shortest path first protocols the router each create three separate tables. One keeps track of directly attached neighours, one determins the topology of the entire internetwork. Exp. OSPF

·Hybrid protocol: hybrid protocol used aspect of both distance-vector and link state protocol

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RIP:ROUTINGINFORMATION PROTOCOL

·  Distance vector protocol
· Work on bellwan port theory
·  Rip use udp port 520 port
·  Open standard protocols
·  Broadcast to all at 255.255.255.0
·  Matric hope count 15 router
· AD value 120
· Timer a. 30 sec update b. 180 sec is invalid or hold down time c. 240 sec flush out time.

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EIGRP:ENHANCEDINTERIOR GATWAY PROTOCOL

·   This is hybrid protocol (rip+ospf)
·   AD value 90
·   Follow dual (difuse update algo)
·   Fast conversion
·   Timer a. 5 sec for hello packets b. 15 sec flush out time
·   Multicast  at 224.0.0.10
·   It has five packets hello, update, query,  reply, ack
·  250 support
·  It is use RTP  reliable transfer protocol
·  Make three table a. neigbour b. topology c. routing
·  Dynamic protocol

OSPF:OPENSHORTEST PATH FIRST PROTOCOL

·  Dynamic protocol

·  Dijkistra algo follow

·  Link state protocols

·  Timer a. 10sec hello timing b. 40 sec flush time

·  Unlimited router can communicate

·   Ad value 110

·   Metric cost

·   In this area created

·   Area 0 back bone area

·  All area must be connect  to area 0

·   Support authentication

·   Multicast at 224.0.0.5

·  Make three table a. neighbor table b. topology table c. routing table

GROUTING CONFIGURATION MODES

·USER MODE OR CONSOLE MODE= ROUTER>

 PRIVILEGE MODE=ROUTER#

· GLOBALCONFIGURATION          MODE=ROUTER(CONFIG)#

·   SPECIFICATION MODE=ROUTER(CONFIG-IF)#

CONFIGUREIP ADDRESS TO LAN PORT

·         ROUTER>ENABLE

·         ROUTER#COFIGURATION TERMINAL

·         ROUTER(CONFIG)#INERFACE FASTETHERNET 0/0

·         ROUTER(CONFIG-IF)#IP ADDRESS ***.***.***.***          ***.***.***.***

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