We are getting this below error message at a 7200 router with ios “7200-jk9o3s-mz.124-25b.bin
Error Messgae: Apr 9 09:51:02: %IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/0.129: the fragment table has reached its maximum threshold 16
We have identified the issue is because of the datagrams being reassembled at any one time has reached it maximum limit. And the recommended solution is to set the maximum number of the datagrams by entering # ip virtual-reassembly max-reassemblies <number>
Because of some administrative issue we could not go with this solution . And It would be great if you clarify me the below points.
1) If we are leaving the same issue as such (logs ) , what will be its impact in the device ? 2) Recently we are getting the high cpu utilization in this router very much frequently. So please let me know the whether the above error will cause for the high cpu utilization .
Yes it's usually related as reassembly is only done in software (no hw support).
This feature is useful if CBAC is configured so it can inspect fragmented packets by reassembly them first and for NAT so it can have access to the payload (NAT ALG)
If none of those are configured, you can disable Virtual Fragmentation Reassembly on the interface. The other solution is to find out why you are receiving fragmented packets (MTU issue somewhere) and try to fix it.
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