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4900M: CPU receive Q "L3 Glean, 6"

Hi,

on a Cisco 4900M running IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-ENTSERVICESK9-M), Version 15.0(2)SG1, RELEASE SOFTWARE (fc4)

I'm getting a lot of packets on CPU Q "L3 Glean, 6".

What is that queue and what could be the root cause?

Thanks.

Wolfgang

--

Packets Received by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg

---------------------- --------------- --------- --------- --------- ----------

Host Learning                     1563         0         0         0          0

L2 Control                     1138188         3         0         0          0

Ttl Expired                          2         0         0         0          0

L3 Glean, 6                    4889394      4067      4381      3367        779

L2 router to CPU, 7            3810017        11         2         1          0

L3 Glean, 7                         18         0         0         0          0

L3 Receive, 7                       13         0         0         0          0

Packets Dropped by Packet Queue

Queue                  Total           5 sec avg 1 min avg 5 min avg 1 hour avg

---------------------- --------------- --------- --------- --------- ----------

Host Learning                      164         0         0         0          0

L3 Glean, 6                    1366203       984      1159       894        218

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4900M: CPU receive Q "L3 Glean, 6"

Usually those are caused by packets going to an IP address that requires arp resolution.  

(if it has an incomplete or no entry in the arp table, and packets are going to this ip address they will be punted to the CPU)

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