LIST IGPS

The more detal is in the accessory.

LIST  IGPS

1、RIP(routing information protocol)
   max hop count=16
   management distance=120
   exchange routing info=30seconds

RIP V1
   not support veriable length subnet mask
2、RIP V2
   can support veriable length subnet mask

3、IGRP(Interior Gateway Routing Protocol)
   Band Width、Load、Delay、Reliability、MTU(can handwith the max data)
   Cisco protocol
   management distance=100
   hop count=100
   exchange routing info=90seconds(every)
   three routing tables:neighbor table、topology table、routing table
4、EIGRP(Enhanced Interior Gateway routing Protocol)
   4.1 Load balancing across equal�Cand unequal�Ccost pathways:
   4.2 Metrics Calculations
   Metric=[K1*BW+((K2*BW)/(256-LOAD))+K3*delay]
     By default:K1=1,K2=0,K3=1,K4=0,K5=0
   4.3 also has three routing tables the same as the EIGRP
   4.4 Link-state Database    SPF Algorithm     Routing table

5、OSPF(Open Shortest Path First)
   5.1 OSPF requires a hierachical network structure
   5.2 The same hierachical network has the same tables
   5.3 Has a Backbone Area
   5.4 Why we must devide different areas in OSPF protocol?
     first,if one router info update in EIGRP,all the router tables update
     second,in OSPF ,every area has the same routing table info.So one change,only the area change.
   5.5 LAN Links
      DR(Designated Router) the hign ip address
      BDR(Backup Designated Router)
      if DR down,BDR will be DR.
   5.6 OSPF packet types:
      Hello――create neighbours
      Database Description――send summary
      Link―state Request――if neighbour down,send a Request
      Link―state update――send update
      Link―state ACK――ACK
  5.7 OSPF protocol number is 89
  5.8 The two Multicast address :
      from non―designated router to desiganted router:224.0.0.6
      from desiganted to non is :224.0.0.5