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| 作者：不明 来源：www.pccode.net 整理 发布时间：2007-1-24 15:24:00 发布人：wongrs | |
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infinity/exceeding TTL: max.16 loops, Split Horizon: stops info return, Route Poisoning: uses net unreachable entry (metric for down link = infinity), and triggered updates. Hold Downs : stops regular updates from reinstating down link, waits & watches status, work with route poisoning, and use triggered updates. Link State- OSPF- uses LSP (hello pkts), topology Dbase, SPF algorithm, metric-65533, routing table. needs more power, memory, b/w, fast conv @ 2-12 hrs(uses DR designated Router), LSP time stamps, Balanced Hybrid-IS-IS, EIGRP: combines and uses best of both above. Link state triggers. Classfull routing: summarizing routing info by major network nos.(RIP, IGRP), Classless and Prefix routing : allows contiguous blocks of hosts, subnets or nets to be represented by a single route. Cost= Path Cost: based on hope, bw, etc. to determine the best route. Lower the cost value better the path. Routing metric: method by which routing algorithm decides one route is better than other. Stored in routing table. Includes bw, comm cost, delay, hop count, load, MTU, path cost, and reliability. RIP: dynamic, dist vect, classful routing proto, no support prefix routing. Provides IP dest add, metric-hop count (16), IP add of next router in the way, marker & flags (recent route change), timer, Hold downs, Split horizon, Poison rev, slow conv, loops. Timers: update-30sec, invalid-180sec, flush-240sec., hold-180sec, Admn Dist.: 120, RIP pkt format: command1,ver no1, zero2, add family ID2, zero2, add4, zero4, zero4, metric4. Enab RIP: cancel all stat/def routes, config t, Enab RIP(# router rip),Enab net (# net work x.x.0.0), R# wr mem Testing RIP: # sh ip route rip, # ping [add]. Passive RIP: stops router from advt to internet. Commands: config t, # router rip, # network 172.16.0.0, # passive serial 1 ( serial 1 connects the local net to the internet), Neighbor RIP: WAN link (frame relay) doesn’t broadcast RIP update by default. use neighbor command to solve this. config t, # router rip, # network 172.16.0.0, # neighbor 172.18.3.10. RIP Broadcast : sending update to 255.255.255.255 via e0 Monitoring RIP: R # sh ip route rip-sh only RIP routes, # sh ip protocol-sh RIP timers, net ID, routing info sources, # sh ip interface: shows interface config and statistics, R# debug ip rip: turns on RIP debugging-shows RIP updates live, # undebug ip rip: stops d
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