高級路由管理ppt課件(編輯修改稿)
2025-02-06 03:56 本頁面
【文章內(nèi)容簡介】 RIP OSPF Area 0 RIP Avoiding Loops R2 R3 R2 R1 Redistribution Example 2 cont router ospf 109 work area 0 work area 0 redistribute rip subs metrictype 1 metric 20 distributelist 11 out rip accesslist 11 permit ? Minimizes routing table entries ? Localizes impact of a topology change OSPF Route Summarization Area 0 Backbone ABRs Area 1 Summarization x O O O O O O O Routing Table for B Routing Table for C IA ? Interarea (IA) summary link carries mask ? One entry can represent several subs Route Summarization (cont.) Area 1 Area 0 ABR Summarization B A C Summary Route Mask = 240 Address = 12 Existing Sub Mask = 252 Address = 12 1111 11 00 0000 11 00 1111 0000 0000 1100 Valid 3rd Sub Invalid Sub Zero ? Some addresses may need reallocating Route Summarization Issue Router (configrouter) area areaid range address mask Route Summarization Commands ? Consolidates IA routes on an ABR Router (configrouter) summaryaddress address mask ? Consolidates external routes on an ASBR Route Summarization Example R2 R2 router ospf 100 work area 2 work area 0 area 0 range area 2 range R1 router ospf 100 work area 1 work area 0 area 0 range area 1 range Area 2 Area 1 Interface Addresses ( mask) Interface Addresses ( mask) R1 R2 Area 0 Default route to routers outside the area ? Add a default route to the OSPF router connected to the outside work. This route can be redistributed to each router in the Area through normal OSPF updates ? Router(config)ip route [interface | nexthop address] ? The following configuration statement will propagate this route to all the routers in a normal OSPF area: – Router(configrouter) defaultinformation originate – All routers in the OSPF area will learn a default route provided that the interface of the border router to the default gateway is active. OSPF route authencation ? Enable area authencation on all routers in that area – Router(configrouter) area area_id authencation – Router(configrouter) ip ospf authencationkey password ? MD5 cyrptographic authencation – Router(configrouter) area area_id authencation messagedigest – Router(configrouter) ip ospf messagedigestkey key_value md5 password OSPF virtual links ? It’s the last option, and the better choice is to avoid virtual link – Router(configrouter) area transit_area_id virtuallink router_id_of_remote – Router show ip ospf virtuallinks 確認 OSPF 配置及運行狀態(tài) ? Verifies interfaces are in correct areas Router show ip ospf interface e0 Ether0 is up, line protocol is up Inter Address , Area Process ID 10, Router ID , Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State BDR, Priority 1 Designated Router (ID) , Interface address Backup Designated router (ID) , Interface address Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 0:00:02 Neighbor Count is 3, Adjacent neighbor count is 3 Adjacent with neighbor (Designated Router) Loopback0 is up, line protocol is up Inter Address , Area 1 Process ID 10, Router ID , Network Type LOOPBACK, Cost: 1 Loopback interface is treated as a stub Host show ip ospf interface Command Show IP ospf interface In this example, we use loopback interface instead of Ether interface ? Displays general information about the OSPF routing process Router show ip ospf Routing Process ospf 1 with ID Supports only single TOS (TOS0) routes SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Number of areas in this router is 1 Area 23 Number of int
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