Routers display the %NHRP-3-PAKREPLY: Receive Resolution Reply packet with error - insufficient resources error message

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Core issue

A Cisco router that runs Next Hop Resolution Protocol (NHRP) over Multipoint GRE (mGRE) tunnels may report this error upon receiving an NHRP Receive Resolution Reply packet:

In the process switching path, NHRP also attempts to look-up a cache entry for the real destination prefix, instead of the next-hop IP address for that prefix in its global routing table. When NHRP performs such a look-up for a host prefix (/32), it fails to find a match, even if a less specific network cache entry does exist. This event results in the %NHRP-3-PAKREPLY message being displayed to the console.

Resolution

This issue is discussed in Cisco bug IDs CSCdt23105 and CSCeb24211

As a workaround perform these commands in the router.

buffers middle permanent 60
buffers middle max-free 300
buffers middle min-free 30

For more information ,refer to Network Management Commands and Buffer Tuning for all Cisco Routers

Also as a workaround in this scenario you can use Cisco Express Forwarding (CEF). For more information, refer to the ip cef command.

Problem Type

Troubleshoot software feature

Product Family

Firewall - IOS firewall

Routers

Frequency

Continuously

Error

%NHRP-3-PAKREPLY: Receive Resolution Reply packet with error - insufficient resources

Cisco IOS Software Version

12.1

VPN Protocols

IPSec

Bug ID

Bug ID not listed