Drop: 9614 encapsulation failed

[kar.somnath]

Hi,

We are getting packet drop in our network passing through WAN Router. Please find the below command output from WAN router.

sh interfaces gi0/1

Input queue: 0/75/16058/0 (size/max/drops/flushes); Total output drops: 0

sh ip traffic

Drop:  9614 encapsulation failed, 0 unresolved, 0 no adjacency

Can you please let me know how to resolve this issue. Please let me know if you need any other details.

Thanks,

som

[Calin C.]

This encapsulation failed drops, increase constantly and fast or you just have them over a longer period of time?

Usually this "encapsulation failed" indicates that the router had no ARP request entry and therefore did not send a datagram.

If they increase in a rapid manner, check your routing configuration and forwarding table. Your device may receive a lot of packets that it doesn't know how to handle due to inconsistent routing / forwarding table.

HTH,

Calin

[kar.somnath]

Hi Calin,

I have checked that encapsulation failed drops is not increase constantly.

Thx,

som

[kar.somnath]

but input queue drop increasing rapidly

Before-

Input queue: 0/75/16058/0 (size/max/drops/flushes); Total output drops: 0

Now-

Input queue: 0/75/16098/0 (size/max/drops/flushes); Total output drops: 0

[lgijssel]

This may be just because you have qos or policing on this interface.

In that case, it is normal behaviour.

regards,

Leo

[lgijssel]

You can look this up in the command reference:

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rdip.html#wp1020634

Look at table 23:

encapsulation failed

Usually indicates that the router had no ARP request entry and therefore did not send a datagram.

regards,

Leo