BGP组网实验IBGP全连接与路由反射器.docx
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BGP组网实验IBGP全连接与路由反射器.docx
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BGP组网实验IBGP全连接与路由反射器
组网一:
BGP路由黑洞问题
拓扑图:
Ip地址配置:
R1:
interfaceLoopback0
ipaddress10.0.0.1255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.1.6255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
!
interfaceSerial0/1
ipaddress10.0.15.1255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
R2:
interfaceLoopback0
ipaddress10.0.0.2255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.1.10255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
!
interfaceSerial0/1
ipaddress10.0.26.1255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
r3:
interfaceLoopback0
ipaddress10.0.0.3255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.1.5255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
interfaceFastEthernet1/0
ipaddress10.0.1.1255.255.255.252
ipospfnetworkpoint-to-point//**配置成点对点类型
ipospfcost100//**ospfcost值配为100
duplexauto
speedauto
!
interfaceEthernet3/0
ipaddress10.3.3.1255.255.255.0
half-duplex
R4:
interfaceFastEthernet1/0
ipaddress10.0.1.2255.255.255.252
ipospfnetworkpoint-to-point//**接口类型点对点
ipospfcost100//**cost为100
duplexauto
speedauto
!
interfaceEthernet3/0
ipaddress10.3.4.1255.255.255.0
half-duplex
interfaceLoopback0
ipaddress10.0.0.4255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.1.9255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
R5:
interfaceLoopback0
ipaddress10.5.0.1255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.15.2255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
interfaceEthernet3/0
ipaddress10.5.5.1255.255.255.0
half-duplex
R6:
interfaceEthernet3/0
ipaddress10.6.6.1255.255.255.0
half-duplex
interfaceLoopback0
ipaddress10.6.0.1255.255.255.255
!
interfaceSerial0/0
ipaddress10.0.26.2255.255.255.252
serialrestart-delay0
nodce-terminal-timing-enable
IGP配置:
R1
routerospf1
router-id1.1.1.1
log-adjacency-changes
network10.0.0.10.0.0.0area0
network10.0.1.40.0.0.3area0
network10.0.15.00.0.0.3area0
R2
routerospf1
router-id2.2.2.2
log-adjacency-changes
network10.0.0.20.0.0.0area0
network10.0.1.80.0.0.3area0
network10.0.26.00.0.0.3area0
R3:
routerospf1
router-id3.3.3.3
log-adjacency-changes
network10.0.0.30.0.0.0area0
network10.0.1.00.0.0.3area0
network10.0.1.40.0.0.3area0
network10.3.3.00.0.0.255area0
R4:
routerospf1
router-id4.4.4.4
log-adjacency-changes
network10.0.0.40.0.0.0area0
network10.0.1.00.0.0.3area0
network10.0.1.80.0.0.3area0
network10.3.4.00.0.0.255area0
BGP配置:
R1:
routerbgp65000
nosynchronization
bgplog-neighbor-changes
network10.0.0.0mask255.255.0.0
network10.3.0.0mask255.255.0.0
neighbor10.0.0.2remote-as65000
neighbor10.0.0.2update-sourceLoopback0
neighbor10.0.0.2next-hop-self
neighbor10.0.15.2remote-as65001
noauto-summary
R2:
routerbgp65000
nosynchronization
bgplog-neighbor-changes
network10.0.0.0mask255.255.0.0
network10.3.0.0mask255.255.0.0
neighbor10.0.0.1remote-as65000
neighbor10.0.0.1update-sourceLoopback0
neighbor10.0.0.1next-hop-self
neighbor10.0.26.2remote-as65002
noauto-summary
R5:
routerbgp65001
nosynchronization
bgplog-neighbor-changes
network10.5.0.0mask255.255.0.0
neighbor10.0.15.1remote-as65000
noauto-summary
R6:
routerbgp65002
nosynchronization
bgplog-neighbor-changes
network10.6.0.0mask255.255.0.0
neighbor10.0.26.1remote-as65000
noauto-summary
以10.5.5.1为源traceroute10.6.6.1,查看数据包经过的路径,同时在r3上debugippacket:
r5#traceroute10.6.6.1source10.5.5.1
Typeescapesequencetoabort.
Tracingtherouteto10.6.6.1
110.0.15.1[AS65000]36msec60msec56msec//**数据包首先经过了r1
2***
3***
r3#debugippacket
*Mar101:
48:
46.291:
IP:
s=10.0.1.5(local),d=10.5.5.1,len56,unroutable
r3#
*Mar101:
48:
48.299:
IP:
s=10.0.1.6(Serial0/0),d=224.0.0.5,len80,rcvd0
r3#
*Mar101:
48:
49.303:
IP:
s=10.0.1.5(local),d=10.5.5.1,len56,unroutable
//**到r3后查看路由表后发现目标不可达
*Mar101:
48:
49.763:
IP:
s=10.0.1.2(FastEthernet1/0),d=224.0.0.5,len80,rcvd0
broad/multicast
*Mar101:
48:
52.303:
IP:
s=10.0.1.5(local),d=10.5.5.1,len56,unroutable
*Mar101:
48:
55.311:
IP:
s=10.5.5.1(Serial0/0),d=10.6.6.1,len28,unroutable
*Mar101:
48:
55.315:
IP:
s=10.0.1.5(local),d=10.5.5.1,len56,unroutable
*Mar101:
48:
58.291:
IP:
s=10.0.1.6(Serial0/0),d=224.0.0.5,len80,rcvd0
*Mar101:
48:
58.387:
IP:
s=10.5.5.1(Serial0/0),d=10.6.6.1,len28,unroutable
*Mar101:
48:
58.391:
IP:
s=10.0.1.5(local),d=10.5.5.1,len56,unroutable
黑洞分析:
R5的路由表:
r5#showiproute
10.0.0.0/8isvariablysubnetted,7subnets,4masks
C10.0.15.0/30isdirectlyconnected,Serial0/0
B10.3.0.0/16[20/0]via10.0.15.1,00:
32:
08
C10.5.5.0/24isdirectlyconnected,Ethernet3/0
B10.0.0.0/16[20/0]via10.0.15.1,00:
32:
08
B10.6.0.0/16[20/0]via10.0.15.1,00:
30:
55
//**R5上有去往10.6.0.0的路由下一跳为R1
C10.5.0.1/32isdirectlyconnected,Loopback0
S10.5.0.0/16isdirectlyconnected,Null0
查看R1路由表:
rt1#showiproute
10.0.0.0/8isvariablysubnetted,15subnets,4masks
O10.0.1.8/30[110/228]via10.0.1.5,00:
37:
53,Serial0/0
C10.0.15.0/30isdirectlyconnected,Serial0/1
O10.0.0.2/32[110/229]via10.0.1.5,00:
37:
53,Serial0/0
S10.3.0.0/16isdirectlyconnected,Null0
O10.0.0.3/32[110/65]via10.0.1.5,00:
37:
53,Serial0/0
O10.3.3.0/24[110/74]via10.0.1.5,00:
37:
53,Serial0/0
S10.0.0.0/16isdirectlyconnected,Null0
O10.0.1.0/30[110/164]via10.0.1.5,00:
37:
53,Serial0/0
C10.0.0.1/32isdirectlyconnected,Loopback0
B10.6.0.0/16[200/0]via10.0.0.2,00:
32:
59
//**通过递归查找发现去往10.6.0.0的路由直连下一跳为R3的10.0.1.5
O10.3.4.0/24[110/174]via10.0.1.5,00:
37:
53,Serial0/0
O10.0.0.4/32[110/165]via10.0.1.5,00:
37:
53,Serial0/0
B10.5.0.0/16[20/0]via10.0.15.2,00:
34:
13
C10.0.1.4/30isdirectlyconnected,Serial0/0
O10.0.26.0/30[110/292]via10.0.1.5,00:
37:
54,Serial0/0
查看R3的路由表:
r3#showiproute
10.0.0.0/8isvariablysubnetted,11subnets,3masks
O10.0.1.8/30[110/164]via10.0.1.2,00:
40:
32,FastEthernet1/0
O10.0.15.0/30[110/128]via10.0.1.6,00:
40:
32,Serial0/0
O10.0.0.2/32[110/165]via10.0.1.2,00:
40:
32,FastEthernet1/0
C10.0.0.3/32isdirectlyconnected,Loopback0
C10.3.3.0/24isdirectlyconnected,Ethernet3/0
C10.0.1.0/30isdirectlyconnected,FastEthernet1/0
O10.0.0.1/32[110/65]via10.0.1.6,00:
40:
32,Serial0/0
O10.3.4.0/24[110/110]via10.0.1.2,00:
40:
32,FastEthernet1/0
O10.0.0.4/32[110/101]via10.0.1.2,00:
40:
32,FastEthernet1/0
C10.0.1.4/30isdirectlyconnected,Serial0/0
O10.0.26.0/30[110/228]via10.0.1.2,00:
40:
32,FastEthernet1/0
//**在R3上只有IGP路由,不可能学习到10.6..0.0的路由数据包在此丢弃.
组网二:
BGP同步
对同步的分析理解:
1.两种状态
非同步状态下,会将从IBGP学到的路由通告给他的EBGP邻居。
同步状态下,只将达到同步的路由通告给它的EBGP邻居,即如果一条从IBGP学到的路由,也能从IGP学到,那么这条路由将通告给它的EGP邻居
2.怎样达到同步
将从EBGP学到的路由重发布至IGP中
3.将BGP路由重发布进IGP的危害
BGP路由一般比较复杂,往往会超过IGP所能承受的极限,导致崩溃。
4.什么情况下可以关同步
本AsneiyunxingMPLS,且本AS不是transmitAS,本as内的所有提供转发服务的路由器都能从BGP学到其他AS的路由
rt1#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*i10.0.0.0/1610.0.0.201000i
*>0.0.0.0032768i
*i10.3.0.0/1610.0.0.201000i
*>0.0.0.0032768i
*>10.5.0.0/1610.0.15.20065001i
*>i10.6.0.0/1610.0.0.20100065002i
//**标记下与开同步后进行对比
r2#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*>10.0.0.0/160.0.0.0032768i
*i10.0.0.101000i
*>10.3.0.0/160.0.0.0032768i
*i10.0.0.101000i
*>i10.5.0.0/1610.0.0.10100065001i
*>10.6.0.0/1610.0.26.20065002i
//**标记好进行对比
r5#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*>10.0.0.0/1610.0.15.10065000i
*>10.3.0.0/1610.0.15.10065000i
*>10.5.0.0/160.0.0.0032768i
r6#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*>10.0.0.0/1610.0.26.10065000i
*>10.3.0.0/1610.0.26.10065000i
*>10.6.0.0/160.0.0.0032768i
在实验组网一的配置下,是关闭同步的,所以
开同步:
rt1(config)#routerbgp65000
rt1(config-router)#synchronization
r2(config)#routerbgp65000
r2(config-router)#syn
查看开启同步后bgp表的变化:
rt1#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*i10.0.0.0/1610.0.0.201000i
*>0.0.0.0032768i
*i10.3.0.0/1610.0.0.201000i
*>0.0.0.0032768i
*>10.5.0.0/1610.0.15.20065001i
*i10.6.0.0/1610.0.0.20100065002i
//**因为10.6.0.0网段是r2通bgp从r6学到的,再通过ibgp告诉r1,但r1不能从igp学到这条路由,所以这条路由不能进路由表
rt1#showiproute
10.0.0.0/8isvariablysubnetted,14subnets,4masks
O10.0.1.8/30[110/228]via10.0.1.5,01:
20:
07,Serial0/0
C10.0.15.0/30isdirectlyconnected,Serial0/1
O10.0.0.2/32[110/229]via10.0.1.5,01:
20:
07,Serial0/0
S10.3.0.0/16isdirectlyconnected,Null0
O10.0.0.3/32[110/65]via10.0.1.5,01:
20:
07,Serial0/0
O10.3.3.0/24[110/74]via10.0.1.5,01:
20:
07,Serial0/0
S10.0.0.0/16isdirectlyconnected,Null0
O10.0.1.0/30[110/164]via10.0.1.5,01:
20:
07,Serial0/0
C10.0.0.1/32isdirectlyconnected,Loopback0
O10.3.4.0/24[110/174]via10.0.1.5,01:
20:
07,Serial0/0
O10.0.0.4/32[110/165]via10.0.1.5,01:
20:
07,Serial0/0
B10.5.0.0/16[20/0]via10.0.15.2,00:
19:
18
C10.0.1.4/30isdirectlyconnected,Serial0/0
O10.0.26.0/30[110/292]via10.0.1.5,01:
20:
08,Serial0/0
//**路由表中没有了去往10.6.0.0的路由
r2#showipbgp
NetworkNextHopMetricLocPrfWeightPath
*>10.0.0.0/160.0.0.0032768i
*i10.0.0.101000i
*>10.3.0.0/160.0.0.0032768i
*i10.0.0.101000i
*i10.5.0.0/1610.0.0.10100065001i
//**同样r2上也没有了关于10.5.0.0的路由
*>10.6.0.0/1610.0.26.20065002i
解决方法是做重发布:
将bgp路由重发布进igp
rt1(config)#routerospf1
rt1(config-router)#redistributebgp65000subnetsmetric4000
r2(config)#routerospf1
r2(config-router)#redistributebgp65000su
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- BGP 组网 实验 IBGP 连接 路由 反射