当前位置:网站首页>[hcie TAC] question 3
[hcie TAC] question 3
2022-07-07 03:49:00 【Heterogenesis】
subject :AR32 loopback 0 cannot access ISIS All routes of the zone .
One 、 Fault root cause judgment
AR32 loopback 0 cannot access ISIS The root cause of all routes in the region is ,AR28 In connection AR32 Of g 2/0/0 The interface is targeted at OSPF Of 5 class LSA Filter .
Two 、 Fault analysis :
2.1、 stay AR32 On the implementation ping -a 10.5.1.32 x.x.x.x ( among x.x.x.x yes ISIS All routes of the zone ), It is found that there are inaccessible ISIS Failure of all routes in the area . Need to view AR32 Whether there is ISIS Relevant routing information of regional equipment .
2.2、 stay AR32 On the implementation display ip routing-table command , see AR32 Routing table information for , The output is as follows :
<AR32>display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 14 Routes : 14
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.5.1.27/32 OSPF 10 2 D 10.5.239.28 GigabitEthernet0/0/0
10.5.1.28/32 OSPF 10 1 D 10.5.239.28 GigabitEthernet0/0/0
10.5.1.29/32 OSPF 10 2 D 10.5.239.28 GigabitEthernet0/0/0
10.5.1.32/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.5.1.33/32 OSPF 10 3 D 10.5.239.28 GigabitEthernet0/0/0
10.5.40.0/24 OSPF 10 3 D 10.5.239.28 GigabitEthernet0/0/0
10.5.128.0/24 OSPF 10 2 D 10.5.239.28 GigabitEthernet0/0/0
From the output results AR32 There is nothing in the routing table of ISIS Related routing entries of the region , But there is AR28 loopback0 Routing information for , explain AR28 And AR32 Of OSPF The neighborhood relationship is established normally . because OSPF The agreement is through LSA To transmit routing information , So I need to check AR32 Of LSDB Does the database have ISIS Regional 5 class LSA.
2.3、 stay AR32 On the implementation display ospf lsdb command , see AR32 Of LSDB Does the database have ISIS Regional 5 class LSA, The output is as follows :
<AR32>dis ospf lsdb
OSPF Process 1 with Router ID 10.5.1.32
Link State Database
Area: 0.0.0.1
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.5.1.32 10.5.1.32 205 48 80000006 1
Router 10.5.1.28 10.5.1.28 214 36 80000004 1
Network 10.5.239.32 10.5.1.32 205 32 80000002 0
Sum-Net 10.5.128.0 10.5.1.28 252 28 80000001 1
Sum-Net 10.5.1.29 10.5.1.28 212 28 80000001 1
Sum-Net 10.5.1.28 10.5.1.28 252 28 80000001 0
Sum-Net 10.5.1.27 10.5.1.28 212 28 80000001 1
Sum-Net 10.5.40.0 10.5.1.28 212 28 80000001 2
Sum-Asbr 10.5.1.29 10.5.1.28 212 28 80000001 1
Sum-Asbr 10.5.1.27 10.5.1.28 212 28 80000001 1
From the output results ,AR32 Of LSDB There is no ISIS Regional 5 class LSA, The preliminary judgment may be AR28 Upper not ISIS The process is introduced into OSPF In progress , because OSPF Agreed 5 class LSA It is flooding to the whole OSPF In domain , also AR32 And AR27、AR29 Of OSPF Neighborhood relations are established normally , So you can view AR27 and AR29 Of LSDB Whether there is ISIS Regional 5 class LSA To judge AR28 Whether it will ISIS The process is introduced into OSPF In progress .
2.4、 stay AR27 and AR29 On the implementation display ospf lsdb command , see OSPF Of LSDB Whether there is... In the data ISIS Regional 5 class LSA, The output is as follows :
<AR27>display ospf lsdb
OSPF Process 1 with Router ID 10.5.1.27
Link State Database
Area: 0.0.0.0
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.5.1.27 10.5.1.27 1183 48 80000013 1
Router 10.5.1.29 10.5.1.29 1184 36 80000011 1
Router 10.5.1.28 10.5.1.28 1183 48 80000014 1
Network 10.5.128.30 10.5.1.29 1184 36 8000000C 0
Sum-Net 10.5.1.33 10.5.1.29 1432 28 80000002 1
Sum-Net 10.5.1.32 10.5.1.28 1159 28 80000001 1
Sum-Net 10.5.1.29 10.5.1.29 1438 28 80000002 0
Sum-Net 10.5.239.0 10.5.1.28 1185 28 80000003 1
Sum-Net 10.5.40.0 10.5.1.29 1438 28 80000002 1
AS External Database
Type LinkState ID AdvRouter Age Len Sequence Metric
External 10.5.1.31 10.5.1.28 1185 36 80000004 1
External 10.5.1.30 10.5.1.28 1185 36 80000004 1
External 10.5.1.34 10.5.1.28 1185 36 80000004 1
External 10.5.14.0 10.5.1.28 1185 36 80000004 1
External 10.5.34.0 10.5.1.28 1185 36 80000004 1
External 10.5.130.0 10.5.1.28 1185 36 80000004 1
External 10.5.129.0 10.5.1.28 1185 36 80000004 1
-------------------------------------------------------------------------------
<AR29>display ospf lsdb
OSPF Process 1 with Router ID 10.5.1.29
Link State Database
Area: 0.0.0.0
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.5.1.27 10.5.1.27 1249 48 80000013 1
Router 10.5.1.29 10.5.1.29 1248 36 80000011 1
Router 10.5.1.28 10.5.1.28 1248 48 80000014 1
Network 10.5.128.30 10.5.1.29 1248 36 8000000C 0
Sum-Net 10.5.1.33 10.5.1.29 1496 28 80000002 1
Sum-Net 10.5.1.32 10.5.1.28 1224 28 80000001 1
Sum-Net 10.5.1.29 10.5.1.29 1502 28 80000002 0
Sum-Net 10.5.239.0 10.5.1.28 1250 28 80000003 1
Sum-Net 10.5.40.0 10.5.1.29 1502 28 80000002 1
Area: 0.0.0.2
Type LinkState ID AdvRouter Age Len Sequence Metric
Router 10.5.1.33 10.5.1.33 1486 48 80000007 1
Router 10.5.1.29 10.5.1.29 1497 48 80000006 1
Network 10.5.40.34 10.5.1.33 1486 32 80000003 0
Sum-Net 10.5.128.0 10.5.1.29 1502 28 80000002 1
Sum-Net 10.5.1.32 10.5.1.29 1223 28 80000001 2
Sum-Net 10.5.1.28 10.5.1.29 1246 28 80000001 1
Sum-Net 10.5.1.27 10.5.1.29 137 28 80000003 1
Sum-Net 10.5.239.0 10.5.1.29 1246 28 80000001 2
NSSA 0.0.0.0 10.5.1.29 1464 36 80000002 1
AS External Database
Type LinkState ID AdvRouter Age Len Sequence Metric
External 10.5.1.31 10.5.1.28 1250 36 80000004 1
External 10.5.1.30 10.5.1.28 1250 36 80000004 1
External 10.5.1.34 10.5.1.28 1250 36 80000004 1
External 10.5.14.0 10.5.1.28 1250 36 80000004 1
External 10.5.34.0 10.5.1.28 1250 36 80000004 1
External 10.5.130.0 10.5.1.28 1250 36 80000004 1
External 10.5.129.0 10.5.1.28 1250 36 80000004 1
From the output results ,AR27 And AR29 Of LSDB There is... In the database ISIS Regional 5 class LSA, explain AR28 Admiral ISIS The process is introduced into OSPF In progress , because AR28 Upper not OSPF The process is introduced into ISIS This fault phenomenon will also be caused in the process , So I need to check ISIS Whether there is OSPF Routing information of the area .
2.5、 stay AR32 and AR34 On the implementation display routing-table command , See if it exists OSPF Area routing , The output is as follows
<AR31>display ip routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: Public
Destinations : 23 Routes : 23
Destination/Mask Proto Pre Cost Flags NextHop Interface
10.5.1.27/32 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.1.28/32 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.1.29/32 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.1.30/32 ISIS-L1 15 20 D 10.5.14.34 GigabitEthernet0/0/1
10.5.1.31/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.5.1.32/32 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.1.33/32 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.1.34/32 ISIS-L1 15 10 D 10.5.14.34 GigabitEthernet0/0/1
10.5.14.0/24 Direct 0 0 D 10.5.14.31 GigabitEthernet0/0/1
10.5.14.31/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/1
10.5.14.255/32 Direct0 0 D 127.0.0.1 GigabitEthernet0/0/1
10.5.34.0/24 ISIS-L1 15 20 D 10.5.14.34 GigabitEthernet0/0/1
10.5.40.0/24 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
10.5.128.0/24 ISIS-L2 15 74 D 10.5.130.28 GigabitEthernet0/0/2
<AR34>display ip routing-table
Route Flags: R - relay, D - download to fib
-----------------------------------------------------------------------------
Routing Tables: Public
Destinations : 16 Routes : 17
Destination/Mask Proto Pre Cost Flags NextHop Interface
0.0.0.0/0 ISIS-L1 15 10 D 10.5.14.31 GigabitEthernet0/0/1
ISIS-L1 15 10 D 10.5.34.30 GigabitEthernet0/0/0
10.5.1.30/32 ISIS-L1 15 10 D 10.5.34.30 GigabitEthernet0/0/0
10.5.1.31/32 ISIS-L1 15 10 D 10.5.14.31 GigabitEthernet0/0/1
10.5.1.34/32 Direct 0 0 D 127.0.0.1 LoopBack0
10.5.14.0/24 Direct 0 0 D 10.5.14.34 GigabitEthernet0/0/1
10.5.14.34/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/1
10.5.14.255/32 Direct0 0 D 127.0.0.1 GigabitEthernet0/0/1
10.5.34.0/24 Direct 0 0 D 10.5.34.34 GigabitEthernet0/0/0
10.5.34.34/32 Direct 0 0 D 127.0.0.1 GigabitEthernet0/0/0
10.5.34.255/32 Direct0 0 D 127.0.0.1 GigabitEthernet0/0/0
10.5.129.0/24 ISIS-L1 15 20 D 10.5.34.30 GigabitEthernet0/0/0
10.5.130.0/24 ISIS-L1 15 20 D 10.5.14.31 GigabitEthernet0/0/1
From the output results ,AR31 In the routing table of OSPF All routes of the zone ,AR34 There are two default routes on , The next jump points to AR30 and AR31, explain AR28 Admiral OSPF The process is introduced into ISIS In progress , Need to check AR31、AR32、AR34 Whether there is a filtering strategy that causes failure on .
2.6、 stay AR31、AR32、AR34 On the implementation display ip ip-prefix,display acl all,display traffic-filter applied-record
、display traffic-policy applied-record 、display route-policy command , No filtering strategy that can lead to modification failure has been found .
in summary :AR27 and AR29 Of LSDB There exists in the database ISIS Regional 5 class LSA,ISIS Regional AR31 In the routing table of OSPF Routing information of the area , explain AR28 I did OSPF and ISIS Two way introduction of , Check AR31、AR32、AR34 There is no filtering strategy that can cause failure . So the judgment is AR28 In connection AR32 Of g2/0/0 The interface is targeted at OSPF Of 5 class LSA Filter .
3、 ... and 、 Trouble shooting
3.1、 stay AR28 Delete... On g 2/0/0 Filter commands on the interface , The specific operation is as follows :
system-view # Enter the system view
int g2/0/0 # Enter the interface view
undo ospf filter-lsa-out # Delete the filter command
After the execution of the above order AR32 Execute the following command on , To check whether the fault has been solved :
display ospf lsdb # see ospf Of LSDB Whether there is ISI Regional 5 class LSA
display ip routing-table # Check whether there is ISIS Area routing
ping -a 10.5.1.32 x.x.x.x {x.x.x.x yes ISIS All routes of the zone } # Test and ISIS Routing connectivity of the region .
3.2、 Other high probability errors —— stay AR28 There is a target on ISIS Filtering strategy of regional traffic , Execute the following command to solve the problem :
display traffic-filter applied-record # Check whether there is traffic filtering
display traffic-policy applied-record # Check whether there is a traffic policy
system-view # Enter the system view
int { Configure the interface of traffic filtering strategy } # Enter the interface view
undo traffic-filter inbound/outbound # Delete traffic filtering
undo traffic-policy inbound/outbound # Delete traffic policy
After the execution of the above order AR32 Execute the following command on , To check whether the fault has been solved :
display ospf lsdb # see ospf Of LSDB Whether there is ISI Regional 5 class LSA
display ip routing-table # Check whether there is ISIS Area routing
ping -a 10.5.1.32 x.x.x.x {x.x.x.x yes ISIS All routes of the zone } # Test and ISIS Routing connectivity of the region .
If after executing the above command , The problem is still unresolved , Please send a front-line engineer to the site to remove obstacles , Or provide complete equipment configuration information , And call Huawei 400 Hotline , Ask Huawei experts for assistance .
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