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OSPF subnets maximum thre...

OSPF subnets maximum threshold excceded

Created: Oct 8, 2019 00:23:30Latest reply: Oct 11, 2019 19:03:58 480 4 0 0 0
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i have scenario where i have core-switch ( 12708-E ) connect to one router , between these two devices we configured ospf ( 1 ) , and we advertise all subnests i have on both core switch and routers , now the issue is that on the core switch i have more than 165 subnets and when i configured them , up to 150 subnets will be advertised and remaining won't be advertised to the router and it shows on the terminal monitor scereen that (( interfaces enabled with ospf has reaced the maximum threshold ) kindly i need urgent help for this , because the customer wants only to use ospf and i have no any other option .

Note :-

in this case we cant do summarization because my core-sw doesnt act as neither ABR nor ASBR , its only advertise subnet to its neighbour on the same area and process-ID . we use 12708-E as core switch .


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Popeye_Wang
Admin Created Oct 9, 2019 01:31:37

In fact, it is not the subnets but the ospf interface specification has reached the upper limit.  If a network segment advertised by the network command contains an interface IP address, the interface is counted. You can run the display ospf cumulative command to check the number of ospf up interfaces.

Please try to delete some subnets that are advertised by using the network command and import these subnets into OSPF through import+policy mode.
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chenhui
chenhui Admin Created Oct 8, 2019 00:47:49

@user_3539913 hello,
is it possible to aggregate the routes manually, then advertise the manually aggregated routes to the OSPF neighbor?
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Ali_medani
Ali_medani Created Oct 8, 2019 22:00:36

hello dear ,
actually i already tried to do so , but when i aggregate the routes manually its still showing the same message on the terminal , and i guess this due to that all these subnets are direct interface on the core switch so when you enable manual aggregation it will include all the direct route learned on the device so we come to the same issue .
i really appreciate your concern and hope to find any other possible way to do so .
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Popeye_Wang
Popeye_Wang Admin Created Oct 9, 2019 01:31:37

In fact, it is not the subnets but the ospf interface specification has reached the upper limit.  If a network segment advertised by the network command contains an interface IP address, the interface is counted. You can run the display ospf cumulative command to check the number of ospf up interfaces.

Please try to delete some subnets that are advertised by using the network command and import these subnets into OSPF through import+policy mode.
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  • x
  • convention：
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Ali_medani
Ali_medani Created Oct 11, 2019 19:03:58

Posted by Popeye_Wang at 2019-10-09 01:31 In fact, it is not the subnets but the ospf interface specification has reached the upper limit.   ...
yes , as you mentioned its the ospf interface specification has reached to the maximum upper limit .
thnx so much , appreciate your help .
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