1 OSPF实验1.1 实验一：单区域OSPF1.1.1 实验目的1.了解OSPF的工作原理2.掌握单区域OSPF的配置3.掌握修改网络类型、链路cost、重发布外部路由。
1.1.2 实验拓扑图1.1.3 实验设备两台三层交换机，两台路由器本文档中使用了RSR20-04两台，版本10.3(3)，S3750-24两台，版本10.2（4）。
1.1.4 实验场景及要求两台三层3750-24交换机，作为下连用户的网关。
路由器R4连接外网172.17.0.0——172.17.7.0/24。
1.所有路由设备启用ospf，进程号为100，除连接外网的接口外，所有接口都在区域10内。
2.修改点对点连接的以太网链路类型3.修改172.16.0.0/24和172.16.1.0/24的开销。
4.在R4上配置静态路由，目标网络172.17.0.0—172.17.7.0/24，通过重发布引入外部路由1.1.5 实验步骤及主要配置1.按照规划，完成基本配置，配置接口IP☺测试PC到网关的连通性和路由器之间链路的连通性2.启用OSPF进程100，并指定router-id3.把设备互联接口和要通告的用户网关放入OSPF进程，并和区域10绑定☺在SW1查看邻居表，路由表，并使用ping命令测试PC的连通性在R1上能看到哪几个邻居，状态是：4.把连接用户的接口配置为被动接口5.如果设备互联链路是以太网链路，修改网络类型为Point-to-Point6.在SW1上的SVI接口下修改开销，其中172.16.0.0/24的开销为100，172.16.1.0/24的开销是500.☺修改前后使用show ip ospf interface查看接口的ospf信息，关注接口的网络类型和cost、等信息7.在R4配置静态路由，通过重发布把这8条静态路由引入ospf进程100的网络中，重发布时指定metric值为1008.对引入的路由进行路由汇总9.在R4上向OSPF进程100引入缺省路由，metric指定为200☺在SW1上查看路由表，有多少条OSPF学习到的路由?路由类型是什么？其中外部路由的cost为多少？为什么？1.1.6 实验作业1.在OSPF中只有通过哪种协议包形成邻居，才能交换路由？影响邻居关系形成的因素有哪些？2.点对点互联的以太网链路缺省网络类型是什么?有DR的选举吗?在SW1和R1之间谁是DR?SW2和R2之间呢？如何控制DR的选举？在本实验中为什么要修改网络类型为P-P?3.重发布时如果不指定metric，缺省metric是多少？外部路由的缺省类型是什么？类型1和类型2的区别是什么？4.修改cost的目的是什么？假设在SW2上也有172.16.0.0 172.16.1.0的路由，但csot分别是500和100，会出现什么现象？1.1.7 实验中遇到问题及解决方法1.1.8 实验心得1.2 实验二：多区域OSPF1.2.1 实验目的1.了解多区域的原理掌2.握多区域的配置、路由汇总。
案例精解：BGP路由黑洞2008-10-19 15:05:37标签：路由反射器路由黑洞同步BGP联邦什么是路由黑洞？简单的说，它会默默的将数据包丢弃，使所有数据包有去无回，下面来看一个案例：如图所示：R1和R2建立EBGP邻居关系R2和R5建立IBGP邻居关系R5和R7建立EBGP邻居关系R2、R3、R5之间运行RIPv2首先看配置：hostname r1interface Loopback0ip address 1.1.1.1 255.255.255.0interface Serial1/0ip address 192.168.12.1 255.255.255.0serial restart-delay 0router bgp 100no synchronizationbgp router-id 1.1.1.1bgp log-neighbor-changesnetwork 1.1.1.0 mask 255.255.255.0network 192.168.12.0neighbor 2.2.2.2 remote-as 200neighbor 2.2.2.2 ebgp-multihop 255neighbor 2.2.2.2 update-source Loopback0 no auto-summary!ip route 2.2.2.0 255.255.255.0 192.168.12.2hostname r2interface Loopback0ip address 2.2.2.2 255.255.255.0!interface Serial1/0ip address 192.168.23.2 255.255.255.0serial restart-delay 0!interface Serial1/1ip address 192.168.12.2 255.255.255.0serial restart-delay 0!interface Serial1/2ip address 192.168.24.2 255.255.255.0serial restart-delay 0!router ripversion 2network 2.0.0.0network 192.168.23.0no auto-summary!router bgp 200no synchronizationbgp log-neighbor-changesnetwork 192.168.12.0network 192.168.23.0neighbor 1.1.1.1 remote-as 100neighbor 1.1.1.1 ebgp-multihop 255neighbor 1.1.1.1 update-source Loopback0 neighbor 5.5.5.5 remote-as 200neighbor 5.5.5.5 update-source Loopback0 neighbor 5.5.5.5 next-hop-selfno auto-summary!ip route 1.1.1.0 255.255.255.0 192.168.12.1hostname r3interface Loopback0ip address 3.3.3.3 255.255.255.0!interface Serial1/0ip address 192.168.35.3 255.255.255.0serial restart-delay 0!interface Serial1/1ip address 192.168.23.3 255.255.255.0 serial restart-delay 0router ripversion 2network 3.0.0.0network 192.168.23.0network 192.168.35.0no auto-summaryhostname r5interface Loopback0ip address 5.5.5.5 255.255.255.0!interface FastEthernet0/0no ip addressshutdownduplex half!interface Serial1/0ip address 192.168.57.5 255.255.255.0 serial restart-delay 0!interface Serial1/1ip address 192.168.35.5 255.255.255.0 serial restart-delay 0!interface Serial1/2ip address 192.168.45.5 255.255.255.0 serial restart-delay 0!interface Serial1/3no ip addressshutdownserial restart-delay 0!router ripversion 2network 5.0.0.0network 192.168.35.0no auto-summary!router bgp 200no synchronizationbgp log-neighbor-changesbgp confederation identifier 200neighbor 3.3.3.3 remote-as 200neighbor 7.7.7.7 remote-as 300neighbor 7.7.7.7 ebgp-multihop 255neighbor 7.7.7.7 update-source Loopback0 no auto-summary!ip route 7.7.7.0 255.255.255.0 192.168.57.7interface Serial1/1ip address 192.168.57.7 255.255.255.0serial restart-delay 0!interface Serial1/2no ip addressshutdownserial restart-delay 0!interface Serial1/3no ip addressshutdownserial restart-delay 0!router bgp 300no synchronizationbgp log-neighbor-changesneighbor 5.5.5.5 remote-as 200neighbor 5.5.5.5 ebgp-multihop 255no auto-summary!ip route 5.5.5.0 255.255.255.0 192.168.57.5现在查看R1的路由表r7#sh ip routeB 1.1.1.0 [20/0] via 5.5.5.5, 00:02:54 //为节约篇幅未完整显示可见R7学到了R1的路由，从表面上看这个实验很完美，达了目的，然而这时问题出现了，作个测试，在R7上PING R1r7#ping 1.1.1.1Type escape sequence to abort.Sending 5, 0-byte ICMP Echos to 7.7.7.7, timeout:.....这究竟是怎么回事呢？原来，我们在R5上关闭了同步，这时它会将一条并没有优化的路由传送给R7，当R7要发向R1发包时，它看到R5是它的下一跳，于是将包发给R5，然后R5又查看它的路由表，发现到R1的下一跳是R2，并继续查找，发现在通过R3可以达到R2，于是它将数据送给R3，这时问题出现了，因为R3没有运行BGP，它不知道R1怎么走，于是它将数据包丢弃，从而造成路由黑洞。
一、实验步骤配置各台设备的ip地址测试直连的连通性配置OSPF 路由协议配置BGP路由协议宣告BGP网络合理修改BGP路由的属性来改变路由的选择测试网络的连通性二、配置命令及其实验结果配置物理接口IP地址和loopback地址，并测试直连的连通性--------------略Loopback 0 ：10.1.1.1/32 RT1Loopback 0 ：10.2.2.2/32 RT2Loopback 0 ：10.3.3.3/32 RT3Loopback 0 ：10.4.4.4/32 RT4配置OSPF协议wcg-RT2:ospf 1 router-id 10.2.2.2area 0.0.0.0network 192.168.23.1 0.0.0.0network 10.2.2.2 0.0.0.0wcg-RT3：ospf 1 router-id 10.3.3.3area 0.0.0.0network 192.168.23.2 0.0.0.0 network 10.3.3.3 0.0.0.0 network 192.168.34.2 0.0.0.0wcg-RT4:ospf 1 router-id 10.4.4.4area 0.0.0.0network 192.168.34.1 0.0.0.0 network 10.4.4.4 0.0.0.0在wcg-RT4上查看IP路由表配置BGP路由协议wcg-RT1:bgp 65001router-id 10.1.1.1undo synchronizationpeer 192.168.12.2 as-number 65002 peer 192.168.14.2 as-number 65002wcg-RT2:bgp 65002router-id 10.2.2.2undo synchronizationpeer 192.168.12.1 as-number 65001 peer 10.3.3.3 as-number 65002peer 10.3.3.3 connect-interface LoopBack0wcg-RT3:bgp 65002router-id 10.3.3.3undo synchronizationpeer 10.4.4.4 as-number 65002peer 10.2.2.2 as-number 65002peer 10.4.4.4 connect-interface LoopBack0 peer 10.2.2.2 connect-interface LoopBack0wcg-RT4:bgp 65002undo synchronizationpeer 192.168.14.1 as-number 65001peer 10.3.3.3 as-number 65002peer 10.3.3.3 connect-interface LoopBack0 在wcg-RT1和wcg-RT4上查看BGP邻居表宣告BGP路由网络wcg-RT1：bgp 65001network 100.1.1.1 255.255.255.255wcg-RT3：bgp 65002network 200.1.1.1 255.255.255.255network 200.2.2.2 255.255.255.255network 200.3.3.3 255.255.255.255在wcg-RT1和wcg-RT4上查看BGP路由表在上面的截图我们看见了100.1.1.1的路由是无效的路由，原因是吓一跳不可达，所有需要在wcg-RT2和wcg-RT4上指定吓一跳为自己wcg-RT2：bgp 65002peer 10.3.3.3 next-hop-localwcg-RT4：bgp 65002peer 10.3.3.3 next-hop-local在wcg-RT3上查看BGP路由表修改BGP属性使得100网络和200网络相互访问均通过下一跳R4 方案一：wcg-RT1：bgp 65001peer 192.168.14.2 preferred-value 10wcg-RT3：bgp 65002peer 10.4.4.4 preferred-value 10在wcg-RT1和wcg-RT3上查看BGP路由表还原方案一实验之前的实验效果方案二：wcg-RT2：bgp 65002default med 10default local-preference 90在wcg-RT1和wcg-RT3上查看BGP路由表还原方案二实验之前的实验效果方案三：wcg-RT1：route-policy 123 permit node 10apply origin incompletequitbgp 65001peer 192.168.12.2 route-policy 123 exportwcg-RT3：route-policy 123 permit node 10apply origin incompletequitbgp 65002peer 10.2.2.2 route-policy 123 export在wcg-RT1和wcg-RT13上查看BGP路由表。
路由器反射器（RR）配置一、路由器基本配置R1>enableR1#conf tR1(config)#int lo 0R1(config-if)#ip add 1.1.1.1 255.255.255.0R1(config-if)#exitR1(config-if)#ip add 12.12.12.1 255.255.255.0 R1(config-if)#clock rate 128000R1(config-if)#no shutdownR1(config-if)#endR1#R2>enableR2#conf tR2(config)#int lo 0R2(config-if)#ip add 2.2.2.2 255.255.255.0R2(config-if)#exitR2(config)#int s0/0R2(config-if)#ip add 12.12.12.2 255.255.255.0 R2(config-if)#no shutdownR2(config-if)#exitR2(config)#int s0/1R2(config-if)#ip add 23.23.23.2 255.255.255.0 R2(config-if)#clock rate 128000R2(config-if)#no shutdownR2(config-if)#endR2#R3>enableR3#conf tR3(config)#int lo 0R3(config-if)#ip add 3.3.3.3 255.255.255.0R3(config-if)#exitR3(config)#int s0/0R3(config-if)#ip add 23.23.23.3 255.255.255.0 R3(config-if)#no shutdownR3(config-if)#exitR3(config)#int s0/1R3(config-if)#ip add 34.34.34.3 255.255.255.0 R3(config-if)#clock rate 128000R3(config-if)#no shutdownR3(config-if)#endR3#R4>enableR4#conf tR4(config)#int lo 0R4(config-if)#ip add 4.4.4.4 255.255.255.0R4(config-if)#exitR4(config-if)#ip add 34.34.34.4 255.255.255.0R4(config-if)#no shutdownR4(config-if)#exitR4(config)#exitR4#二、对路由器进行配置R1#conf tR1(config)#router eigrp 1R1(config-router)#net 1.1.1.0R1(config-router)#net 12.12.12.0R1(config-router)#no auto-summaryR1(config-router)#exitR1(config)#router bgp 100R1(config-router)#no synchronizationR1(config-router)#no auto-summaryR1(config-router)#bgp router-id 1.1.1.1R1(config-router)#neighbor 2.2.2.2 remote-as 100R1(config-router)#neighbor 2.2.2.2 update-source lo 0R1(config-router)#net 1.1.1.0 mask 255.255.255.0R1(config-router)#endR1#R2#conf tR2(config)#router eigrp 1R2(config-router)#net 12.12.12.0R2(config-router)#net 23.23.23.0R2(config-router)#net 2.2.2.0R2(config-router)#no auto-summaryR2(config-router)#exiR2(config)#router bgp 100R2(config-router)#no synchronizationR2(config-router)#no auto-summaryR2(config-router)#bgp router-id 2.2.2.2R2(config-router)#neighbor 1.1.1.1 remote-as 100R2(config-router)#neighbor 1.1.1.1 update-source lo 0R2(config-router)#neighbor 1.1.1.1 route-reflector-client //配置RR客户端R2(config-router)#neighbor 3.3.3.3 remote-as 100R2(config-router)#neighbor 3.3.3.3 update-source lo 0R2(config-router)#neighbor 3.3.3.3 route-reflector-clientR2(config-router)#endR2#R3#conf tR3(config)#router eigrp 1R3(config-router)#net 3.3.3.0R3(config-router)#net 23.23.23.0R3(config-router)#no auto-summaryR3(config-router)#exitR3(config)#router bgp 100R3(config-router)#no synchronizationR3(config-router)#no auto-summaryR3(config-router)#bgp router-id 3.3.3.3R3(config-router)#neighbor 2.2.2.2 remote-as 100R3(config-router)#neighbor 2.2.2.2 update-source lo 0R3(config-router)#neighbor 2.2.2.2 next-hop-selfR3(config-router)#neighbor 34.34.34.4 remote-as 200R3(config-router)#endR3#R4#conf tR4(config)#router bgp 200R4(config-router)#no synchronizationR4(config-router)#no auto-summaryR4(config-router)#bgp router-id 4.4.4.4R4(config-router)#neighbor 34.34.34.3 remote-as 100R4(config-router)#net 4.4.4.0 mask 255.255.255.0R4(config-router)#endR4#三、查看路由表R1#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static routeGateway of last resort is not set1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback02.0.0.0/24 is subnetted, 1 subnetsD 2.2.2.0 [90/2297856] via 12.12.12.2, 00:22:09, Serial0/03.0.0.0/24 is subnetted, 1 subnetsD 3.3.3.0 [90/2809856] via 12.12.12.2, 00:15:34, Serial0/04.0.0.0/24 is subnetted, 1 subnetsB 4.4.4.0 [200/0] via 3.3.3.3, 00:00:0423.0.0.0/24 is subnetted, 1 subnetsD 23.23.23.0 [90/2681856] via 12.12.12.2, 00:22:09, Serial0/012.0.0.0/24 is subnetted, 1 subnetsC 12.12.12.0 is directly connected, Serial0/0R1#R2#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static routeGateway of last resort is not set1.0.0.0/24 is subnetted, 1 subnetsD 1.1.1.0 [90/2297856] via 12.12.12.1, 00:14:16, Serial0/02.0.0.0/24 is subnetted, 1 subnetsC 2.2.2.0 is directly connected, Loopback03.0.0.0/24 is subnetted, 1 subnetsD 3.3.3.0 [90/2297856] via 23.23.23.3, 00:07:40, Serial0/14.0.0.0/24 is subnetted, 1 subnetsB 4.4.4.0 [200/0] via 3.3.3.3, 00:02:2523.0.0.0/24 is subnetted, 1 subnetsC 23.23.23.0 is directly connected, Serial0/112.0.0.0/24 is subnetted, 1 subnetsC 12.12.12.0 is directly connected, Serial0/0R2#R3#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static routeGateway of last resort is not set34.0.0.0/24 is subnetted, 1 subnetsC 34.34.34.0 is directly connected, Serial0/11.0.0.0/24 is subnetted, 1 subnetsD 1.1.1.0 [90/2809856] via 23.23.23.2, 00:07:48, Serial0/02.0.0.0/24 is subnetted, 1 subnetsD 2.2.2.0 [90/2297856] via 23.23.23.2, 00:07:48, Serial0/03.0.0.0/24 is subnetted, 1 subnetsC 3.3.3.0 is directly connected, Loopback04.0.0.0/24 is subnetted, 1 subnetsB 4.4.4.0 [20/0] via 34.34.34.4, 00:03:2623.0.0.0/24 is subnetted, 1 subnetsC 23.23.23.0 is directly connected, Serial0/012.0.0.0/24 is subnetted, 1 subnetsD 12.12.12.0 [90/2681856] via 23.23.23.2, 00:07:49, Serial0/0R3#R4#sh ip routeCodes: C - connected, S - static, R - RIP, M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2E1 - OSPF external type 1, E2 - OSPF external type 2i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2ia - IS-IS inter area, * - candidate default, U - per-user static routeo - ODR, P - periodic downloaded static routeGateway of last resort is not set34.0.0.0/24 is subnetted, 1 subnetsC 34.34.34.0 is directly connected, Serial0/01.0.0.0/24 is subnetted, 1 subnetsB 1.1.1.0 [20/0] via 34.34.34.3, 00:00:504.0.0.0/24 is subnetted, 1 subnetsC 4.4.4.0 is directly connected, Loopback0R4#四、测试R2#sh ip bgp neiR2#sh ip bgp neighbors 1.1.1.1BGP neighbor is 1.1.1.1, remote AS 100, internal linkBGP version 4, remote router ID 1.1.1.1BGP state = Established, up for 00:04:40Last read 00:00:39, hold time is 180, keepalive interval is 60 seconds Neighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and receivedMessage statistics:InQ depth is 0OutQ depth is 0Sent RcvdOpens: 2 2Notifications: 0 0Updates: 2 2Keepalives: 29 29Route Refresh: 0 0Total: 33 33Default minimum time between advertisement runs is 5 secondsFor address family: IPv4 UnicastBGP table version 9, neighbor version 9/0Output queue sizes : 0 self, 0 replicatedIndex 2, Offset 0, Mask 0x4Route-Reflector Client2 update-group memberSent RcvdPrefix activity: ---- ----Prefixes Current: 1 1 (Consumes 48 bytes) Prefixes Total: 2 1Implicit Withdraw: 1 0Explicit Withdraw: 0 0Used as bestpath: n/a 1Used as multipath: n/a 0Outbound InboundLocal Policy Denied Prefixes: -------- -------Total: 0 0Number of NLRIs in the update sent: max 1, min 0Connections established 2; dropped 1Last reset 00:05:19, due to RR client config changeConnection state is ESTAB, I/O status: 1, unread input bytes: 0 Connection is ECN DisabledLocal host: 2.2.2.2, Local port: 11002Foreign host: 1.1.1.1, Foreign port: 179Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)Event Timers (current time is 0x2272C0):Timer Starts Wakeups NextRetrans 8 0 0x0TimeWait 0 0 0x0AckHold 6 0 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0iss: 220836448 snduna: 220836769 sndnxt: 220836769 sndwnd: 16064irs: 2855413144 rcvnxt: 2855413378 rcvwnd: 16151 delrcvwnd: 233SRTT: 197 ms, RTTO: 984 ms, RTV: 787 ms, KRTT: 0 msminRTT: 28 ms, maxRTT: 300 ms, ACK hold: 200 msFlags: active open, nagleIP Precedence value : 6Datagrams (max data segment is 536 bytes):Rcvd: 12 (out of order: 0), with data: 6, total data bytes: 233Sent: 10 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 8, total data bytes: 320R2#R2#sh ip bgp neighbors 3.3.3.3BGP neighbor is 3.3.3.3, remote AS 100, internal linkBGP version 4, remote router ID 3.3.3.3BGP state = Established, up for 00:05:58Last read 00:00:57, hold time is 180, keepalive interval is 60 secondsNeighbor capabilities:Route refresh: advertised and received(old & new)Address family IPv4 Unicast: advertised and receivedMessage statistics:InQ depth is 0OutQ depth is 0Sent RcvdOpens: 2 2Notifications: 0 0Updates: 2 2Keepalives: 20 20Route Refresh: 0 0Total: 24 24Default minimum time between advertisement runs is 5 secondsFor address family: IPv4 UnicastBGP table version 9, neighbor version 9/0Output queue sizes : 0 self, 0 replicatedIndex 2, Offset 0, Mask 0x4Route-Reflector Client2 update-group memberSent RcvdPrefix activity: ---- ----Prefixes Current: 2 1 (Consumes 48 bytes)Prefixes Total: 2 1Implicit Withdraw: 0 0Explicit Withdraw: 0 0Used as bestpath: n/a 1Used as multipath: n/a 0Outbound InboundLocal Policy Denied Prefixes: -------- -------Total: 0 0Number of NLRIs in the update sent: max 0, min 0Connections established 2; dropped 1Last reset 00:06:33, due to RR client config changeConnection state is ESTAB, I/O status: 1, unread input bytes: 0Connection is ECN DisabledLocal host: 2.2.2.2, Local port: 11001Foreign host: 3.3.3.3, Foreign port: 179Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)Event Timers (current time is 0x23680C):Timer Starts Wakeups NextRetrans 11 0 0x0TimeWait 0 0 0x0AckHold 8 3 0x0SendWnd 0 0 0x0KeepAlive 0 0 0x0GiveUp 0 0 0x0PmtuAger 0 0 0x0DeadWait 0 0 0x0iss: 1760578556 snduna: 1760578915 sndnxt: 1760578915 sndwnd: 16026irs: 1218313682 rcvnxt: 1218313958 rcvwnd: 16109 delrcvwnd: 275SRTT: 231 ms, RTTO: 769 ms, RTV: 538 ms, KRTT: 0 msminRTT: 24 ms, maxRTT: 300 ms, ACK hold: 200 msFlags: active open, nagleIP Precedence value : 6Datagrams (max data segment is 536 bytes):Rcvd: 17 (out of order: 0), with data: 8, total data bytes: 275Sent: 16 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 11, total data bytes: 358R2#五、查看BGPR2#sh ip bgp 4.4.4.0BGP routing table entry for 4.4.4.0/24, version 7Paths: (1 available, best #1, table Default-IP-Routing-Table)Advertised to update-groups:2200, (Received from a RR-client)3.3.3.3 (metric 2297856) from 3.3.3.3 (3.3.3.3)Origin IGP, metric 0, localpref 100, valid, internal, bestR2#R1#sh ip bgp 4.4.4.0BGP routing table entry for 4.4.4.0/24, version 3Paths: (1 available, best #1, table Default-IP-Routing-Table)Not advertised to any peer2003.3.3.3 (metric 2809856) from 2.2.2.2 (2.2.2.2)Origin IGP, metric 0, localpref 100, valid, internal, bestOriginator: 3.3.3.3, Cluster list: 2.2.2.2R1#。
