syslog notification

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May 15th, 2008
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can any one answer that what this msg indicates? i found this error message on my 6509 switch through syslog.


7201: 1w2d: %MCAST-SP-6-L2_HASH_BUCKET_COLLISION: Failure installing (G,C)->index: (0100.5e5c.c31f,1)->0x806 Protocol :0 Error:3


Thanks - Raheel


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mattcalderon Thu, 05/15/2008 - 07:30
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Not sure what IOS you are running, but check out this bug: CSCsg64306.


Under certain conditions multicast mac entries do not get installed and

throws up an "HASH BUCKET" collision error message with "Page full" as

the reason.

S. Hasan Thu, 05/15/2008 - 08:06
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Version 12.2(18)SXF7 RELEASE SOFTWARE (fc1)


raheel

mattcalderon Thu, 05/15/2008 - 08:09
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Fixed in 12.2(18)SXF8. Did you look at that bug?

S. Hasan Thu, 05/15/2008 - 08:17
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is this a IOS bug??? or it is sumthing like mac-address attack ?


raheel

mattcalderon Thu, 05/15/2008 - 08:25
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I posted a bug that matched the error you saw in the syslog.


%MCAST-SP-6-L2_HASH_BUCKET_COLLISION

Symptom:


Under certain conditions multicast mac entries do not get installed and

throws up an "HASH BUCKET" collision error message with "Page full" as

the reason.


Conditions:


When the page (16 entries) corresponding to the hash of the MAC entry

to be installed is full, the entry is rejected.


Workaround:


No workarounds.


Further Problem Description:


If the page (16 entries) in the L2 CAM table corresponding to the hash

of the MAC entry which is to be installed is full, the entry is rejected. It

does not replace the any of the existing dynamic entries.


The page could be full because of source MACs learnt by the hardware.

Such a condition could occur when the number of source MACs learnt

is very high like in metro ethernet.


Default behaviour of hardware is not to replace dynamic entries under

pagefull condition.

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