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Debug ARP ERROR

I have a intermittence problem with my ASA 5540. When testing connectivity to the servers directly connected me respond randomly.

I have reviewed the ARP tables, finding no problems. I did a debug ARP and I throw the following errors
:

 

arp-req: request for X.X.X.X still  pending
list full, bp 0x700d32a0 freed
arp-req: generating request for X.X.X.X at interface OnDemand-OOB
arp-req: request for X.X.X.X still  pending
list full, bp 0x700d32a0 freed
arp-req: generating request for X.X.X.X at interface OnDemand-OOB
arp-req: request for X.X.X.X still  pending
list full, bp 0x700d32a0 freed

[...]

arp-req: ERROR: list allocation failed, block  0x0 freed
arp-send: arp request built from X.X.X.X c47d.4f84.e9a0 for X.X.X.X at 1089694930
arp-refresh: Trying to refresh ARP for INT_185 X.X.X.X
arp-req: generating request for X.X.X.X at interface OnDemand_Mgmt2
arp-req: ERROR: list allocation failed, block  0x0 freed
arp-send: arp request built from X.X.X.X c47d.4f84.e9a1 for X.X.X.X at 1089694930
arp-refresh: Trying to refresh ARP for OnDemand_Mgmt2 X.X.X.X
arp-req: generating request for X.X.X.X at interface OnDemand_Mgmt2
arp-req: ERROR: list allocation failed, block  0x0 freed
arp-send: arp request built from X.X.X.X c47d.4f84.e9a1 for X.X.X.X at 1089694930
arp-refresh: Trying to refresh ARP for OnDemand_Mgmt2 X.X.X.X
arp-req: generating request for X.X.X.X at interface Ondemand_Mgmt_3

 

The resources of the Firewall:

FW(config)# sh mem
Free memory:      1652785928 bytes (77%)
Used memory:       494697720 bytes (23%)
-------------     ----------------
Total memory:     2147483648 bytes (100%)

 

FW(config)# sh cpu
CPU utilization for 5 seconds = 36%; 1 minute: 36%; 5 minutes: 37%

 

FW(config)# sh conn count
157918 in use, 249613 most used

 

FW(config)# sh xlate count
5465 in use, 56400 most used

 

I have looked for information about this error and have not found anything.

Please your help.

 

Regards,

 

Emilio

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