mpls解决BGP路由黑洞.doc

MPLS 解决BGP路由黑洞问题R1R1enR1#conf tR1(config)#no ip domain-lookupR1(config)#line console 0R1(config-line)#logg sR1(config-line)#no exec-tR1(config-line)#exitR1(config)#interface s1/0R1(config-if)#ip addR1(config-if)#ip address 12.1.1.1 255.255.255.0R1(config-if)#no shR1(config-if)#no shutdown R1(config-if)#interface s1/1R1(config-if)#ip add 13.1.1.1 255.255.255.0R1(config-if)#no shR1(config-if)#no shutdown R1(config-if)#interface lo 0R1(config-if)#ip add 1.1.1.1 255.255.255.0R1(config-if)#exitR1(config)#router eigrp 90R1(config-router)#no auto-summary R1(config-router)#network 0.0.0.0*Mar 1 00:21:40.919: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 90: Neighbor 12.1.1.2 (Serial1/0) is up: new adjacencyR1(config-router)#*Mar 1 00:22:19.859: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 90: Neighbor 13.1.1.3 (Serial1/1) is up: new adjacencyR1(config-router)#do show ip route 1.0.0.0/24 is subnetted, 1 subnetsC 1.1.1.0 is directly connected, Loopback0 2.0.0.0/24 is subnetted, 1 subnetsD 2.2.2.0 90/2297856 via 12.1.1.2, 00:00:56, Serial1/0 3.0.0.0/24 is subnetted, 1 subnetsD 3.3.3.0 90/2297856 via 13.1.1.3, 00:00:14, Serial1/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.1.1.0 is directly connected, Serial1/0 13.0.0.0/24 is subnetted, 1 subnetsC 13.1.1.0 is directly connected, Serial1/1R1(config-router)#exitR1(config)#interface s1/0R1(config-if)#mpls ip*Mar 1 01:13:49.207: %LDP-5-NBRCHG: LDP Neighbor 2.2.2.2:0 (1) is UPR1(config-if)#interface s1/1R1(config-if)#mpls ipR1(config-if)#*Mar 1 01:14:10.571: %LDP-5-NBRCHG: LDP Neighbor 3.3.3.3:0 (2) is UPR2R2enR1#conf tR2(config)#no ip domain-lookupR2(config)#line console 0R2(config-line)#logg sR2(config-line)#no exec-tR2(config-line)#exitR2(config)#interface s1/0R2(config-if)#ip addR2(config-if)#ip address 12.1.1.2 255.255.255.0R2(config-if)#no shR2(config-if)#no shutdown R2(config-if)#interface s1/1R2(config-if)# ip add 24.1.1.2 255.255.255.0R2(config-if)#no shR2(config-if)#no shutdown R2(config-if)#interface lo 0R2(config-if)#ip add 2.2.2.2 255.255.255.0R2(config-if)#exitR2(config)#router eigrp 90R2(config-router)#no auto-summary R2(config-router)#network 12.1.1.0 0.0.0.255R2(config-router)#network 2.2.2.0 0.0.0.255R2(config-router)exitR2(config)#router bgp 123R2(config-router)#no auto-summary R2(config-router)#no synchronization R2(config-router)#bgp router-id 2.2.2.2R2(config-router)#neighbor 24.1.1.4 remote-as 4R2(config-router)#neighbor 3.3.3.3 remote-as 123R2(config-router)#neighbor 3.3.3.3 update-source lo 0R2(config-router)#*Mar 1 00:27:58.535: %BGP-5-ADJCHANGE: neighbor 3.3.3.3 Up R2(config-router)#*Mar 1 00:29:08.071: %BGP-5-ADJCHANGE: neighbor 24.1.1.4 Up R2(config-router)#endR2#shw *Mar 1 00:33:29.527: %SYS-5-CONFIG_I: Configured from console by consoleR2#show ip bgp summary Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd3.3.3.3 4 123 9 9 3 0 0 00:05:45 124.1.1.4 4 4 9 9 3 0 0 00:04:35 1R2#show ip route Gateway of last resort is not set 1.0.0.0/24 is subnetted, 1 subnetsD 1.1.1.0 90/2297856 via 12.1.1.1, 00:23:59, Serial1/0 2.0.0.0/24 is subnetted, 1 subnetsC 2.2.2.0 is directly connected, Loopback0 3.0.0.0/24 is subnetted, 1 subnetsD 3.3.3.0 90/2809856 via 12.1.1.1, 00:23:10, Serial1/0 4.0.0.0/24 is subnetted, 1 subnetsB 4.4.4.0 20/0 via 24.1.1.4, 00:16:37 5.0.0.0/24 is subnetted, 1 subnetsB 5.5.5.0 200/0 via 3.3.3.3, 00:12:09 24.0.0.0/24 is subnetted, 1 subnetsC 24.1.1.0 is directly connected, Serial1/1 12.0.0.0/24 is subnetted, 1 subnetsC 12.1.1.0 is directly connected, Serial1/0 13.0.0.0/24 is subnetted, 1 subnetsD 13.1.1.0 90/2681856 via 12.1.1.1, 00:24:29, Serial1/0R2#show ip bgp BGP table version is 3, local router ID is 2.2.2.2Status codes: s suppressed, d damped, h history, * valid, best, i - internal, r RIB-failure, S StaleOrigin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path* 4.4.4.0/24 24.1.1.4 0 0 4 i*i5.5.5.0/24 3.3.3.3 0 100 0 5 iR2#conf tEnter configuration commands, one per line. End with CNTL/Z. R2(config)#router bgp 123R2(config-router)#neighbor 3.3.3.3 next-hop-self R2(config-router)#exitR2(config)#interface s1/0R2(config-if)#mpls ipR3R3enR3#conf tEnter configuration commands, one per line. End with CNTL/Z.R3(config)#no ip domain-lookupR3(config)#line console 0R3(config-line)#logg sR3(config-line)#no exec-tR3(config-line)#exitR3(config)#interface s1/1R3(config-if)#ip add 13.1.1.3 255.255.255.0R3(config-if)#no shR3(config-if)#no shutdown R3(config-if)#interface s1/0R3(config-if)#ip add 35.1.1.3 255.255.255.0R3(config-if)#no shR3(config-if)#no shutdown R3(config-if)#interface lo 0R3(config-if)#ip add 3.3.3.3 255.255.255.0R3(config-if)#exitR3(config)#router eigrp 90R3(config-router)#no auto-summary R3(config-router)#network 13.1.1.0 0.0.0.255 *Mar 1 00:22:28.539: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 90: Neighbor 13.1.1.1 (Serial1/1) is up: new adjacencyR3(config-router)#network 3.3.3.0 0.0.0.255R3(config-router)#exitR3(config)#router bgp 123R3(config-router)#no auto-summary R3(config-router)#no synchronization R3(config-router)#bgp router-id 3.3.3.3R3(config-router)#neighbor 35.1.1.5 remote-as 5R3(config-router)#neighbor 2.2.2.2 remote-as 123 R3(config-router)#neighbor 2.2.2.2 UPdate-source LO 0*Mar 1 00:27:58.267: %BGP-5-ADJCHANGE: neighbor 2.2.2.2 Up R3(config-router)#neighbor 2.2.2.2 next-hop-self *Mar 1 00:33:39.699: %BGP-5-ADJCHANGE: neighbor 35.1.1.5 Up R3(config-router)#endR3#show ip*Mar 1 00:45:27.479: %SYS-5-CONFIG_I: Configured from console by consoleR3#show ip route 1.0.0.0/24 is subnetted, 1 subnetsD 1.1.1.0 90/2297856 via 13.1.1.1, 00:23:06, Serial1/1 35.0.0.0/24 is subnetted, 1 subnetsC 35.1.1.0 is directly connected, Serial1/0 2.0.0.0/24 is subnetted, 1 subnetsD 2.2.2.0 90/2809856 via 13.1.1.1, 00:23:06, Serial1/1 3.0.0.0/24 is subnetted, 1 subnetsC 3.3.3.0 is directly connected, Loopback0 5.0.0.0/24 is subnetted, 1 subnetsB 5.5.5.0 20/0 via 35.1.1.5, 00:11:55 12.0.0.0/24 is subnetted, 1 subnetsD 12.1.1.0 90/2681856 via 13.1.1.1, 00:23:06, Serial1/1 13.0.0.0/24 is subnetted, 1 subnetsC 13.1.1.0 is directly connected, Serial1/1R3#show ip bgp BGP table version is 2, local router ID is 3.3.3.3 Network Next Hop Metric LocPrf Weight Path* i4.4.4.0/24 24.1.1.4 0 100 0 4 i（R2在IBGP中未更改下一跳，所以次优）* 5.5.5.0/24 35.1.1.5 0 0 5 iR3#show ip bgp Network Next Hop Metric LocPrf Weight Path*i4.4.4.0/24 2.2.2.2 0 100 0 4 i（更改后，最优）* 5.5.5.0/24 35.1.1.5 0 0 5 iR3#show ip route 1.0.0.0/24 is subnetted, 1 subnetsD 1.1.1.0 90/2297856 via 13.1.1.1, 00:46:09, Serial1/1 35.0.0.0/24 is subnetted, 1 subnetsC 35.1.1.0 is directly connected, Serial1/0 2.0.0.0/24 is subnetted, 1 subnetsD 2.2.2.0 90/2809856 via 13.1.1.1, 00:46:09, Serial1/1 3.0.0.0/24 is subnetted, 1 subnetsC 3.3.3.0 is directly connected, Loopback0 4.0.0.0/24 is subnetted, 1 subnetsB 4.4.4.0 200/0 via 2.2.2.2, 00:09:09 5.0.0.0/24 is subnetted, 1 subnetsB 5.5.5.0 20/0 via 35.1.1.5, 00:34:58 12.0.0.0/24 is subnetted, 1 subnetsD 12.1.1.0 90/2681856 via 13.1.1.1, 00:46:10, Serial1/1 13.0.0.0/24 is subnetted, 1 subnetsC 13.1.1.0 is directly connected, Serial1/1R3#conf tR3(config)#interface s1/1R3(config-if)#mpls ipR4R4enR4#conf tEnter configuration commands, one per line. End with CNTL/Z.R4(config)#no ip domain-lookupR4(config)#line console 0R4(config-line)#logg sR4(config-line)#no exec-tR4(config-line)#exitR4(config)#interface s1/1R4(config-if)#ip addR4(config-if)#ip address 24.1.1.4 255.255.255.0R4(config-if)#no shR4(config-if)#no shutdown R4(config-if)#interface lo 0R4(config-if)#ip add 4.4.4.4 255.255.255.0R4(config-if)#exitR4(config)#*Mar 1 00:20:12.531: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to upR4(config)#*Mar 1 00:20:13.339: %LINK-3-UPDOWN: Interface Serial1/1, changed state to upR4(config)#*Mar 1 00:20:14.343: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1/1, changed state to upR4(config)#router bgp 4R4(config-router)#no auto-summary R4(config-router)#no synchronization R4(config-router)#bgp router-id 4.4.4.4R4(config-router)#neighbor 24.1.1.2 remotR4(config-router)#neighbor 24.1.1.2 remote-as 123*Mar 1 00:29:07.415: %BGP-5-ADJCHANGE: neighbor 24.1.1.2 Up R4(config-router)#network 4.4.4.0 mask 255.255.255.0R4(config-router)#exitR5R5enR5#conf tEnter configuration commands, one per line. End with CNTL/Z.R5(config)#no ip domain-lookupR5(config)#line console 0R5(config-line)#logg sR5(config-line)#no exec-tR5(config-line)#exitR5(config)#interface s1/0R5(config-if)#ip add 35.1.1.5 255.255.255.0R5(config-if)#no shR5(config-if)#no shutdown R5(config-if)#interface lo 0R5(config-if)#ip add 5.5.5.5 255.255.255.0R5(config-if)#exit*Mar 1 00:20:19.819: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback0, changed state to upR5(config-if)#exit*Mar 1 00:20:20.627: %LINK-3-UPDOWN: Interface Serial1/0, changed state to upR5(config-if)#exit*Mar 1 00:20:21