Description:
在沒有 folooding 或者 droppig 框架的情況下，Switch 能夠學習新 MAC address 的Max rate.
(學的多快)
Topology:
This test uses the one-to-many mapping but only one port is used for transmission at a time; received address packets should appear on the specified receive ports.
在測試 address rate 時，需在每個 frame size 間做一次reboot.
回覆刪除這樣才能達到 8192.
當Ixia 的 TX port 傳送時，本身的source mac 會佔一個位置，所以Table size 只能設定為 8191.
回覆刪除Hi Thomas,
回覆刪除Please refer to the attached log file for the Address Cache test for determining the address table size on a switch.
I ran this test on 4 ports LM100TX into a NetGear GS516T switch. As you can see I set the initial table size to 10,000 under "Table Size" in Run Setup.
The script determined that there were 4,095 entries in the filter table.
I then went to IxExplorer and set 3 ports in default configuration. I set port 1 packet stream to Stop After This Stream with packets per burst of 5,000. I set the MAC DA in the stream to Continuous Increment. I set port 2 packet stream to the same, except MAC DA to fixed and MAC SA to Continuous Increment. I set the rate of both streams to 10% to make sure the switch
did not drop any frames.
I removed the cables and reinstalled them to clear the switch table. I did a Start Transmit on port 2 and made sure that 5,000 frames were received on both port 1 and port 3 (flooding). Then I cleared all stats on all ports, and did a Start Transmit on port 1. I saw that port 2 received 5,000, and port 3 received 905. This means that there are (5,000 - 905) = 4,095 address entries in the switch filter table, just like the script results displayed.
My advice for your customer would be to try the test again like I did above, and try 10,000 for the table size. Then, whatever result the script provides can be verified from IxExplorer as described above.
I seem to remember that layer 2 switches reserve one table entry internally for the switch management MAC address.
Best Regards,
- Gene