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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>The first thought that comes to mind is that there is a MAC address table hash issue.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>This vendor does a good job of explaining it: <a href="https://www.calix.com/content/dam/calix/mycalix-misc/lib/iae/exa/m/eanepg/index.htm?toc10152651.htm?101585.htm">https://www.calix.com/content/dam/calix/mycalix-misc/lib/iae/exa/m/eanepg/index.htm?toc10152651.htm?101585.htm</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Frank <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> foundry-nsp <foundry-nsp-bounces@puck.nether.net> <b>On Behalf Of </b>Tudor Capatina<br><b>Sent:</b> Thursday, September 14, 2023 8:04 AM<br><b>To:</b> foundry-nsp@puck.nether.net<br><b>Subject:</b> [f-nsp] ICX 6610 not learning mac addresses any more<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Hey there<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>got a weird issue on the above mentioned switches and wondering if anyone has seen something similar. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>A server with mac-add MAC1 is connected to an ICX 6610 SW1. The server is generating traffic. SW1 has a mac-add table of around 10k:<o:p></o:p></span></p></div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Total active entries from all ports = 10368<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>And it does not learn MAC1. However SW1 is connected to another ICX SW2 with a smaller mac-address table (5k) which learns MAC1 from the link to SW1.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>The problem is that SW1 will treat all traffic to MAC1 as unknown unicast and flood it on all it's ports. The issue is not with a specific mac-address but with several.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Mac learning timers are default all over the place. Mac learning is not disabled anywhere. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>I was suspecting some cam profile but cannot see such an option on these devices. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>In theory there should be space to allow learning of more mac-addresses:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>show default values<br>sys log buffers:50 mac age time:300 sec telnet sessions:5 <br><br>System Parameters Default Maximum Current <br>- - - - <br>mac 32768 32768 32768 <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Any ideas are welcome <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Thanks<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'>Tudor<o:p></o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div></div><p class=MsoNormal><br><br>Links contained in this email have been replaced. If you click on a link in the email above, the link will be analyzed for known threats. If a known threat is found, you will not be able to proceed to the destination. If suspicious content is detected, you will see a warning.<o:p></o:p></p></div></body></html>