%IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/1: the fragment table has reached its maximum threshold 16

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Dec 24th, 2012
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Hi,


I am getting the following error on my routers:

%IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/1: the fragment table has reached its maximum threshold 16


I guess this may be affecting OSPF as I constantly see the following error:

Dec 24 09:38:50.685: %IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/1: the fragment table has reached its maximum threshold 16

Dec 24 09:39:10.097: %OSPF-5-ADJCHG: Process 10, Nbr X.X.X.X on Tunnel19 from FULL to DOWN, Neighbor Down: Dead timer expired

Dec 24 09:39:37.057: %OSPF-5-ADJCHG: Process 10, Nbr X.X.X.X on Tunnel19 from LOADING to FULL, Loading Done


I changed the setting on the GigabitEthernet0/1 as:


interface GigabitEthernet0/1

ip virtual-reassembly max-fragments 64


It has not made any difference and still getting

%IP_VFR-4-FRAG_TABLE_OVERFLOW: GigabitEthernet0/1: the fragment table has reached its maximum threshold 16


I am not sure why is it still saying that maximum threshold is 16. Appears that rotuer is not picking up the new configuration, haven't rebooted the router. Any help and suggestion will be much appreciated.


Thanks in advance.


regards,

RS

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SOcchiogrosso Mon, 12/24/2012 - 05:03
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The source of problem is the fragmentation. I would try and address that, setting the proper MTU and TCP adjust mss first.

OSPF neighbors need to agree on the MTU for the link, unless use ip OSPF mtu-ignore on the interface.




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synbureau Mon, 12/24/2012 - 06:39
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Thanks for responding SOcchiogrosso
I do have MTU and MSS setup on interfaces and as for this scenario, I have "ip ospf mtu-ignore" statement on the interface.

SOcchiogrosso Mon, 12/24/2012 - 06:44
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What IOS version are you running?


Is OSPF constanty bouncing or something random?


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synbureau Mon, 12/24/2012 - 06:52
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It is bouncing constantly every few minutes.

IOS: universalk9-mz.SPA.150-1.M7.bin

paolo bevilacqua Mon, 12/24/2012 - 06:45
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Configure for any NAT interface:


no ip virtual-reassembly.

synbureau Thu, 12/27/2012 - 00:43
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the interface has got "ip nat inside" command on it

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