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тАО04-21-2004 08:30 AM
тАО04-21-2004 08:30 AM
Hi,
I'm investigating a leaky 4000M that's running the 9.16 firmware. When I plant a tcpdump on a switch port in promiscuous mode, I pick up (Ethernet) frames (and hence IP packets) that are meant for other switch ports.
I looked at the the MAC address table and hand counted about 300 entries in the CAM table. What's the proper way to look at the CAM table for a 4000M? Particularly % of CAM table in use/free.
I've also been told that the CAM table size of the 4000M is 16k. Is that 16k documented anywhere?
Thanks!
I'm investigating a leaky 4000M that's running the 9.16 firmware. When I plant a tcpdump on a switch port in promiscuous mode, I pick up (Ethernet) frames (and hence IP packets) that are meant for other switch ports.
I looked at the the MAC address table and hand counted about 300 entries in the CAM table. What's the proper way to look at the CAM table for a 4000M? Particularly % of CAM table in use/free.
I've also been told that the CAM table size of the 4000M is 16k. Is that 16k documented anywhere?
Thanks!
If a problem can be fixed, there's nothing to worry. If a problem can't be fixed, worrying ain't gonna help. Bottom line: don't worry.
Solved! Go to Solution.
3 REPLIES 3
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тАО04-21-2004 09:58 AM
тАО04-21-2004 09:58 AM
Solution
Hello Hwee Liang -
The data sheet says that the address table size is 10,000. See: http://www.hp.com/rnd/products/switches/switch4000/specs.htm .
Someone had earlier posted that the size of this table is 16k. It may be the case that the size of the underlying CAM is 16k, but I can assure you that the hashing mechanism used to access the address table makes the 10k number more relevant in a real-world LAN environment. For this reason, HP has never documented the 16k number and never will.
Ralph
The data sheet says that the address table size is 10,000. See: http://www.hp.com/rnd/products/switches/switch4000/specs.htm .
Someone had earlier posted that the size of this table is 16k. It may be the case that the size of the underlying CAM is 16k, but I can assure you that the hashing mechanism used to access the address table makes the 10k number more relevant in a real-world LAN environment. For this reason, HP has never documented the 16k number and never will.
Ralph
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тАО04-21-2004 10:17 AM
тАО04-21-2004 10:17 AM
Re: Leaky 4000M running 9.16
Thanks Ralph. Do you or does anyone here know if the Patricia Tree is being used?
If a problem can be fixed, there's nothing to worry. If a problem can't be fixed, worrying ain't gonna help. Bottom line: don't worry.
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тАО04-21-2004 11:13 AM
тАО04-21-2004 11:13 AM
Re: Leaky 4000M running 9.16
Hwee Liang -
I am sorry but I don't know whether the Patricia Tree is being used.
Ralph
I am sorry but I don't know whether the Patricia Tree is being used.
Ralph
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