NSSA区域多台ABR时做75类LSA转换的情况及此类LSA的路由选择.docx
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NSSA区域多台ABR时做75类LSA转换的情况及此类LSA的路由选择.docx
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NSSA区域多台ABR时做75类LSA转换的情况及此类LSA的路由选择
NSSA区域多台ABR时做7-5类LSA转换的情况
及此类LSA的路由选择
拓扑
R1和R2均为area0和nssaarea1间的ABR,R3和R4均为nssaarea1的ASBR;R3和R4上都配置了四条主机静态路由指向R5,并在ospf里重分发。
实验一
R1与R3之间不做连接,R1学到了E1类型路由,说明R2作为ABR,进行了7/5类LSA转换
R1#shipospfneighbor
OSPFprocess1:
NeighborIDPriStateDeadTimeAddressInterface
3.1.1.11Full/DR00:
00:
381.1.1.2fastethernet0
R1#shiproute
Codes:
C-connected,S-static,R-RIP,O-OSPF,OE-OSPFExternal,M-Management
D-Redirect,E-IRMP,EX-IRMPexternal,o-SNSP,B-BGP,i-ISIS
Gatewayoflastresortisnotset
C1.1.1.0/24isdirectlyconnected,00:
00:
50,fastethernet0
O3.1.1.0/24[110/2]via1.1.1.2,00:
00:
04,fastethernet0
O4.1.1.0/24[110/3]via1.1.1.2,00:
00:
04,fastethernet0
C127.0.0.0/8isdirectlyconnected,01:
05:
03,lo0
OE10.1.1.1/32[150/23]via1.1.1.2,00:
00:
03,fastethernet0
OE11.1.1.1/32[150/23]via1.1.1.2,00:
00:
03,fastethernet0
OE12.1.1.1/32[150/23]via1.1.1.2,00:
00:
03,fastethernet0
OE13.1.1.1/32[150/23]via1.1.1.2,00:
00:
03,fastethernet0
R1#shipospfroute
OSPFprocess1:
Codes:
C-connected,D-Discard,O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
O*1.1.1.0/24[1]isdirectlyconnected,fastethernet0,Area0
IA*3.1.1.0/24[2]via1.1.1.2,fastethernet0,Area0
IA*4.1.1.0/24[3]via1.1.1.2,fastethernet0,Area0
E1*10.1.1.1/32[23]via1.1.1.2,fastethernet0
E1*11.1.1.1/32[23]via1.1.1.2,fastethernet0
E1*12.1.1.1/32[23]via1.1.1.2,fastethernet0
E1*13.1.1.1/32[23]via1.1.1.2,fastethernet0
R1#shipospfdatabase
OSPFRouterwithID(1.1.1.1)(ProcessID1)
RouterLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSumLinkcount
1.1.1.11.1.1.115920x800000080xef2b1
3.1.1.13.1.1.1390x8000000a0xd63a1
NetLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSum
1.1.1.23.1.1.1390x800000070x8d91
SummaryLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSumRoute
3.1.1.03.1.1.116650x800000060x1b113.1.1.0/24
4.1.1.03.1.1.16730x800000050x1a114.1.1.0/24
ASBR-SummaryLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSum
4.1.1.13.1.1.113180x800000050x0227
4.1.1.23.1.1.111000x800000060xeb3c
ASExternalLinkStates
LinkIDADVRouterAgeSeq#CkSumRoute
10.1.1.13.1.1.13440x800000070xb945E110.1.1.1/32[0x0]
11.1.1.13.1.1.13440x800000080xaa52E111.1.1.1/32[0x0]
12.1.1.13.1.1.13440x800000070x9f5dE112.1.1.1/32[0x0]
13.1.1.13.1.1.12800x800000080x9e5bE113.1.1.1/32[0x0]
R1#shipospfdatabaseexternal
OSPFRouterwithID(1.1.1.1)(ProcessID1)
ASExternalLinkStates
LSage:
332
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
10.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000007
Checksum:
0xb945
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.1
ExternalRouteTag:
0
LSage:
332
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
11.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000008
Checksum:
0xaa52
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.1
ExternalRouteTag:
0
LSage:
332
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
12.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000007
Checksum:
0x9f5d
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.1
ExternalRouteTag:
0
LSage:
268
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
13.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000008
Checksum:
0x9e5b
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
R1#shipospfda
R1#shipospfdatabase
OSPFRouterwithID(1.1.1.1)(ProcessID1)
RouterLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSumLinkcount
1.1.1.11.1.1.115920x800000080xef2b1
3.1.1.13.1.1.1390x8000000a0xd63a1
NetLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSum
1.1.1.23.1.1.1390x800000070x8d91
SummaryLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSumRoute
3.1.1.03.1.1.116650x800000060x1b113.1.1.0/24
4.1.1.03.1.1.16730x800000050x1a114.1.1.0/24
ASBR-SummaryLinkStates(Area0)
LinkIDADVRouterAgeSeq#CkSum
4.1.1.13.1.1.113180x800000050x0227
4.1.1.23.1.1.111000x800000060xeb3c
ASExternalLinkStates
LinkIDADVRouterAgeSeq#CkSumRoute
10.1.1.13.1.1.13440x800000070xb945E110.1.1.1/32[0x0]
11.1.1.13.1.1.13440x800000080xaa52E111.1.1.1/32[0x0]
12.1.1.13.1.1.13440x800000070x9f5dE112.1.1.1/32[0x0]
13.1.1.13.1.1.12800x800000080x9e5bE113.1.1.1/32[0x0]
R1#shipospfdatabaseex
R1#shipospfdatabaseexternal
OSPFRouterwithID(1.1.1.1)(ProcessID1)
ASExternalLinkStates
LSage:
385
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
10.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000007
Checksum:
0xb945
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.1
ExternalRouteTag:
0
LSage:
385
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
11.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000008
Checksum:
0xaa52
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.1
ExternalRouteTag:
0
LSage:
10
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
12.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000008
Checksum:
0xab4f
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
LSage:
321
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
13.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000008
Checksum:
0x9e5b
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
注意,R1上的5类LSA,通过FA地址(有时是R3的4.1.1.1,有时是R4的4.1.1.2)可以知道,R2在选择R3还是R4的7类LSA做7/5转换时有一定的随机性,我猜测可能跟age有关。
源自同一台设备的LSAage不同,是因为配置的顺序有先有后,一般情况下,配置完成后,端口up/down或者重启设备,都会使源自同一台设备的LSA的age时间趋于相同,这样,R2选择进行7/5转换的LSA基本就趋于同一台设备的LSA了。
后面的实验里就没再出现选择不同设备的LSA了。
在R2全转换R4的LSA的情况下,将R4的g3口做showdown,路由的学习会怎样的?
R1#shipospfdatabaseexternal
OSPFRouterwithID(1.1.1.1)(ProcessID1)
ASExternalLinkStates
LSage:
615
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
10.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000002
Checksum:
0xd131
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
LSage:
615
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
11.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000002
Checksum:
0xc43d
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
LSage:
615
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
12.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000002
Checksum:
0xb749
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
LSage:
615
Options:
0x22(-|-|DC|-|-|-|E|-)
LSType:
AS-external-LSA
LinkStateID:
13.1.1.1(ExternalNetworkNumber)
AdvertisingRouter:
3.1.1.1
LSSeqNumber:
80000002
Checksum:
0xaa55
Length:
36
NetworkMask:
/32
MetricType:
1
TOS:
0
Metric:
20
ForwardAddress:
4.1.1.2
ExternalRouteTag:
0
R2#shownsmroute
Codes:
K-kernel,C-connected,S-static,R-RIP,B-BGP
O-OSPF,IA-OSPFinterarea
N1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2
E1-OSPFexternaltype1,E2-OSPFexternaltype2
i-IS-IS,L1-IS-ISlevel-1,L2-IS-ISlevel-2,ia-IS-ISinterarea
E-IRMP,EI-IRMPinternal,EX-IRMPexternal
>-selectedroute,*-FIBroute,p-staleinfo,r-recursive,
f-NON-FIBroute,a-NON-ACTIVEroute,c-circlerecursive,b-blackholeroute
NI-interfaceindexnexthop,NA-interfacenamenexthop,NP-ipv4nexthop
NPI-ipv4interfaceindexnexthop,NPA-ipv4interfacenamenexthop,NM-MPLSnexthop
Of1.1.1.0/24client-id2proc-id1nexthop-num1/1
via[110/1]NI1.1.1.2interface2fastethernet0(0)0x9a350a8
Uptime:
00:
14:
03ribaddr:
0x9a22e40
C>1.1.1.0/24client-id0proc-id0nexthop-num1/1
*via[0/100]NI0.0.0.0interface2fastethernet0(0)0x9a35dc8
Uptime:
00:
14:
08ribaddr:
0x9a22b40
Of3.1.1.0/24client-id2proc-id1nexthop-num1/1
via[110/1]NI3.1.1.1interface3fastethernet1(0)0xa91bca8
Uptime:
23:
22:
35ribaddr:
0x9a01120
C>3.1.1.0/24client-id0proc-id0nexthop-num1/1
*via[0/100]NI0.0.0.0interface3fastethernet1(0)0x9a35b48
Uptime:
23:
22:
41ribaddr:
0x9a22f40
O>4.1.1.0/24client-id2proc-id1nexthop-num1/1
*via[110/2]NPI3.1.1.2interface3fastethernet1(0)
routesource4.1.1.20x9a35328
Uptime:
02:
20:
31ribaddr:
0x9a22ac0
ON1>10.1.1.1/32client-id2proc-id1nexthop-num1/1
*via[150/22]NPI3.1.1.2interface3fastethernet1(0)
routesource4.1.1.20x9a35148
Uptime:
02:
20:
30ribaddr:
0x9a22cc0
ON1>11.1.1.1/32client-id2proc-id1ne
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