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	<title>Jorink.nl &#187; Switch</title>
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	<link>http://www.jorink.nl</link>
	<description>Just for documentation</description>
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		<title>Install and setup Minicom</title>
		<link>http://www.jorink.nl/2010/04/install-and-setup-minicom/</link>
		<comments>http://www.jorink.nl/2010/04/install-and-setup-minicom/#comments</comments>
		<pubDate>Tue, 13 Apr 2010 06:59:33 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[Linux]]></category>
		<category><![CDATA[Switches]]></category>
		<category><![CDATA[CLI]]></category>
		<category><![CDATA[Switch]]></category>
		<category><![CDATA[Utils]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=280</guid>
		<description><![CDATA[Minicom is the hyperterminal for Linux. Minicom is by default not installed. Install Minicom with the following command sudo apt-get install minicom Find your serial port dmesg &#124; grep tty $ dmesg &#124; grep tty [    0.001251] console [tty0] enabled [   72.953237] usb 6-1: pl2303 converter now attached to ttyUSB0 I use a USB serial [...]]]></description>
			<content:encoded><![CDATA[<p>Minicom is the hyperterminal for Linux.</p>
<p>Minicom is by default not installed.</p>
<ol>
<li>Install Minicom with the following command<br />
<blockquote><p>sudo apt-get install minicom</p></blockquote>
</li>
<li>Find your serial port<br />
<blockquote><p>dmesg | grep tty</p></blockquote>
<p><code>$ dmesg | grep tty<br />
[    0.001251] console [tty0] enabled<br />
[   72.953237] usb 6-1: pl2303 converter now attached to ttyUSB0</code></p>
<p>I use a USB serial port, my laptop doesn&#8217;t have a build in serial port.<br />
So the name of the serial port is <strong>ttyUSB0</strong>.</li>
<li>Configure Minicom<br />
<blockquote><p>sudo minicom -s</p></blockquote>
<ul>
<li>Select &#8220;Serial Port setup&#8221;</li>
<li>Enter A to change the selected serial port, in my case change to /dev/ttyUSB0</li>
<li>Enter E to change the line speed to 9600 8N1</li>
<li>Select &#8220;Save setup as dfl&#8221;</li>
</ul>
</li>
<li>Exit Minicom</li>
<li>Start Minicom with<br />
<blockquote><p>sudo minicom</p></blockquote>
</li>
</ol>
<p>And you are  good to go.<!-- PHP 5.x --></p>
]]></content:encoded>
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		<item>
		<title>Reset a Foundry ServerIron XL password</title>
		<link>http://www.jorink.nl/2010/03/reset-a-foundry-serveriron-xl-password/</link>
		<comments>http://www.jorink.nl/2010/03/reset-a-foundry-serveriron-xl-password/#comments</comments>
		<pubDate>Thu, 25 Mar 2010 15:05:56 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[Switches]]></category>
		<category><![CDATA[CLI]]></category>
		<category><![CDATA[Switch]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=250</guid>
		<description><![CDATA[Previously I posted a blog about completely resetting a Foundry ServerIron XL But what if you only want to reset the password? This is how it works.. Connect with a serial cable to the Foundry ServerIron XL. 1) Unplug the Switch 2) Plug the switch back in, and be immediately ready to: 3) Hit b [...]]]></description>
			<content:encoded><![CDATA[<p>Previously I posted a blog about completely resetting a Foundry ServerIron XL<br />
But what if you only want to reset the password?<br />
This is how it works..</p>
<p>Connect with a serial cable to the Foundry ServerIron XL.</p>
<p>1) Unplug the Switch<br />
2) Plug the switch back in, and be immediately ready to:<br />
3) Hit b within 2 seconds, to enter into the boot monitor<br />
4) Type:</p>
<blockquote><p>no password<br />
boot system flash primary</p></blockquote>
<p>5) Foundry will boot up, now</p>
<blockquote><p>FastIron> enable<br />
No password has been assigned yet&#8230;<br />
FastIron#</p></blockquote>
<p>6)Set a new password</p>
<blockquote><p>Conf t<br />
FastIron (config)# enable super-user NewPassword<br />
FastIron (config)# write memory</p></blockquote>
<p><!-- PHP 5.x --></p>
]]></content:encoded>
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		<item>
		<title>iSCSI and VMWare Tips</title>
		<link>http://www.jorink.nl/2010/03/iscsi-and-vmware-tips/</link>
		<comments>http://www.jorink.nl/2010/03/iscsi-and-vmware-tips/#comments</comments>
		<pubDate>Tue, 02 Mar 2010 13:11:24 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[Equallogic]]></category>
		<category><![CDATA[VMWare]]></category>
		<category><![CDATA[Switch]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=142</guid>
		<description><![CDATA[I found a great article named A “Multivendor Post” to help our mutual iSCSI customers using VMware You really should read it if your using a SAN in combination with ESX 3.5 http://virtualgeek.typepad.com/virtual_geek/2009/01/a-multivendor-post-to-help-our-mutual-iscsi-customers-using-vmware.html]]></description>
			<content:encoded><![CDATA[<p>I found a great article named</p>
<h3>A “Multivendor Post” to help our mutual iSCSI  customers using VMware</h3>
<p>You really should read it if your using a SAN in combination with ESX 3.5</p>
<p><a href="http://virtualgeek.typepad.com/virtual_geek/2009/01/a-multivendor-post-to-help-our-mutual-iscsi-customers-using-vmware.html" target="_blank">http://virtualgeek.typepad.com/virtual_geek/2009/01/a-multivendor-post-to-help-our-mutual-iscsi-customers-using-vmware.html</a><!-- PHP 5.x --></p>
]]></content:encoded>
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		<title>Massive TCP Retransmits with ESX 3.5 U5, HP ProCurve 3500yl and Equallogic SAN &#8211; UPDATED</title>
		<link>http://www.jorink.nl/2010/02/massive-tcp-retransmits-with-esx-3-5-u5-hp-procurve-3500yl-and-equallogic-san/</link>
		<comments>http://www.jorink.nl/2010/02/massive-tcp-retransmits-with-esx-3-5-u5-hp-procurve-3500yl-and-equallogic-san/#comments</comments>
		<pubDate>Thu, 25 Feb 2010 11:01:57 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[VMWare]]></category>
		<category><![CDATA[Switch]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=98</guid>
		<description><![CDATA[I&#8217;m using serveral ESX 3.5 U5  connected to 2 HP ProCurve 3500yl. When I monitor my Equallogic SAN with SAN Headquarters 2.0 there are a lot of TCP Retransmits. Sometimes more than 3%. After some troubleshooting I discovered the TCP Retransmits are caused by the ESX Nic Teaming connected to the HP ProCurve switches. Every [...]]]></description>
			<content:encoded><![CDATA[<p>I&#8217;m using serveral ESX 3.5 U5  connected to 2 HP ProCurve 3500yl.<br />
When I monitor my Equallogic SAN with SAN Headquarters 2.0 there are a lot of TCP Retransmits. Sometimes more than 3%. After some troubleshooting I discovered the TCP Retransmits are caused by the ESX Nic Teaming connected to the HP ProCurve switches.</p>
<p><a href="http://www.jorink.nl/wp-content/uploads/2010/02/TCP-Retransmits.jpeg" rel="lightbox[98]" title="TCP Retransmits"><img class="aligncenter size-medium wp-image-103" title="TCP Retransmits" src="http://www.jorink.nl/wp-content/uploads/2010/02/TCP-Retransmits-300x72.jpg" alt="" width="300" height="72" /></a>Every ESX server has 2 NICs connected to the iSCSI for VMFS and iSCSI Initiators from the VM&#8217;s. Both NICs are connected to a different switch for redundancy. So for example ESX NIC 1 is connected to port 1 from switch X and ESX NIC 2 is connected to port 1 from switch Y. Port 1 from both switches are configured as a trunk  ( Trunk1 ) not using LACP. Between the 2 switches there is a different trunk configured for the data that needs to be directed to another switch.<br />
﻿<span id="more-98"></span><a href="http://www.jorink.nl/wp-content/uploads/2010/02/ESX-connected.jpeg" rel="lightbox[98]" title="ESX connected"><img class="size-medium wp-image-100 aligncenter" title="ESX connected" src="http://www.jorink.nl/wp-content/uploads/2010/02/ESX-connected-300x134.jpg" alt="" width="300" height="134" /></a></p>
<p>I configured my ESX Nic Teaming like this.</p>
<p style="text-align: left;"><a href="http://www.jorink.nl/wp-content/uploads/2010/02/ESX-NIC-Teaming-settings.jpeg" rel="lightbox[98]" title="ESX NIC Teaming settings"><img class="size-medium wp-image-102 aligncenter" title="ESX NIC Teaming settings" src="http://www.jorink.nl/wp-content/uploads/2010/02/ESX-NIC-Teaming-settings-272x300.jpg" alt="" width="272" height="300" /></a>As you can see 1 NIC is disconnected. This is done for testing. When only 1 NIC is connected the TCP Retransmits disappears.</p>
<p>Port 1 trough 4 on both HP ProCurve switches are used to link the 2 switches together. Here is the relevant config lines from the switch.</p>
<address>interface 1 </address>
<address> name &#8220;Switch Trunk&#8221; </address>
<address> flow-control </address>
<address> no power-over-ethernet </address>
<address>exit </address>
<address>interface 2 </address>
<address> name &#8220;Switch Trunk&#8221; </address>
<address> flow-control </address>
<address> no power-over-ethernet </address>
<address>exit </address>
<address>interface 3 </address>
<address> name &#8220;Switch Trunk&#8221; </address>
<address> flow-control </address>
<address> no power-over-ethernet </address>
<address>exit </address>
<address>interface 4 </address>
<address> name &#8220;Switch Trunk&#8221; </address>
<address> flow-control </address>
<address> no power-over-ethernet </address>
<address>exit </address>
<address>trunk 1-4 Trk1 Trunk </address>
<address>vlan 1<br />
name &#8220;DEFAULT_VLAN&#8221;<br />
no untagged 5-36,38,40,42,44,46,48,Trk1-Trk7<br />
no ip address<br />
exit<br />
vlan 19<br />
name &#8220;iSCSI&#8221;<br />
untagged 5-36,38,40,42,44,46,48,Trk1-Trk7<br />
exit<br />
jumbo ip-mtu 8982<br />
jumbo max-frame-size 9000<br />
spanning-tree Trk1 priority 4<br />
primary-vlan 19 </address>
<p>Here is the config for the port used by the ESX server.</p>
<address>interface 47 </address>
<address> name &#8220;VM-OZ-01&#8243; </address>
<address> flow-control </address>
<address> no power-over-ethernet </address>
<address>exit </address>
<address>trunk 47 Trk2 Trunk </address>
<address>spanning-tree Trk2 priority 4 </address>
<p>Anyone some bright ideas how to resolve this problem?<br />
When browsing the internet for config problems between HP ProCurve switches and ESX 3.5 I found the following websites. After reading this I came to the conclusion my config is the same as recommended here.</p>
<p><a href="http://blog.scottlowe.org/2008/09/05/vmware-esx-nic-teaming-and-vlan-trunking-with-hp-procurve/" target="_blank">http://blog.scottlowe.org/2008/09/05/vmware-esx-nic-teaming-and-vlan-trunking-with-hp-procurve/</a><br />
<a href="http://blog.scottlowe.org/2008/07/16/understanding-nic-utilization-in-vmware-esx/" target="_blank"> http://blog.scottlowe.org/2008/07/16/understanding-nic-utilization-in-vmware-esx/</a><br />
<a href="http://universitytechnology.blogspot.com/2008/09/vmware-esx-vm-network-aggregation.html" target="_blank"> http://universitytechnology.blogspot.com/2008/09/vmware-esx-vm-network-aggregation.html</a><br />
<a href="http://blog.scottlowe.org/2008/09/05/setting-vmware-esx-vswitch-load-balancing-policy-via-cli/" target="_blank"> http://blog.scottlowe.org/2008/09/05/setting-vmware-esx-vswitch-load-balancing-policy-via-cli/</a></p>
<p>UPDATE -</p>
<p>As it turns out HP does not support teaming over 2 switches ( yet ).<br />
This means the ports in Trunk 1 of switch x does not share the MAC adresses with the ports in Trunk 1 of switch y.</p>
<p>So there are 2 solutions left.</p>
<ol>
<li>Connect both NICs from the ESX server on 1 HP switch.In VMWare configure the VSwitch with both NICs as active.  Setup a trunk on this switch with 2 ports.<br />
Load balancing works, but no redundancy.</li>
<li>Connect 1 NIC to switch x and 1 NIC to switch y. In VMWare configure the VSwitch with 1 NIC as active and 1 NIC as standby. Setup a trunk in not necessary.<br />
No Load balancing, but you will have redundancy.</li>
</ol>
<p>I settled for now with solution 2.<br />
Monitoring the NICs from my ESX servers with Cacti to monitor the load from the NICs.</p>
<p>Still searching for a solution with both load balancing as redundancy.<!-- PHP 5.x --></p>
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		<item>
		<title>Reset a foundry ServerIron XL to factory defaults</title>
		<link>http://www.jorink.nl/2010/02/reset-a-foundry-serveriron-xl-to-factory-defaults/</link>
		<comments>http://www.jorink.nl/2010/02/reset-a-foundry-serveriron-xl-to-factory-defaults/#comments</comments>
		<pubDate>Tue, 23 Feb 2010 13:56:47 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[Switches]]></category>
		<category><![CDATA[CLI]]></category>
		<category><![CDATA[Switch]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=65</guid>
		<description><![CDATA[I needed to reset a Foundry Server Iron XL back to factory defaults, and surprisingly couldn’t find the instructions via my buddy google. Foundry is really stingy with with support documents, and knowledge portal acccess, and unless you have a valid support contract, you can’t find ANYTHING. Luckily I do, so I figured I’d share [...]]]></description>
			<content:encoded><![CDATA[<p>I needed to reset a Foundry Server Iron XL back to factory defaults,  and surprisingly couldn’t find the instructions via my buddy google.  Foundry is really stingy with with support documents, and knowledge  portal acccess, and unless you have a valid support contract, you can’t  find ANYTHING. Luckily I do, so I figured I’d share this knowledge for  the sake of future googlers.</p>
<p>First, remove the password:</p>
<p>1) Unplug the Switch</p>
<p>2) Plug the switch back in, and be immediately ready to:</p>
<p>3) Hit b, to enter into the boot monitor</p>
<p>4) Type:</p>
<blockquote><p><code>no password</code></p>
<p>boot system flash primary</p></blockquote>
<p>5) Foundry will boot up, and you can ‘enable’ without being prompted  for a password</p>
<p>To reset your ServerIronXL to factory defaults:</p>
<p>6) After enabling, type:</p>
<blockquote>
<pre>erase start</pre>
</blockquote>
<p>NOTE: This is permanent! There is no going back! Make sure this is  what you want to do! You are resetting to factory defaults (nothing!)</p>
<p>7) Reboot, and enjoy your clean slate</p>
<p>As always, if you find this helpful, please let me know!<!-- PHP 5.x --></p>
]]></content:encoded>
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		<item>
		<title>Clear statistics HP Procurve switch without reboot</title>
		<link>http://www.jorink.nl/2010/02/clear-statistics-hp-procurve-switch-without-reboot/</link>
		<comments>http://www.jorink.nl/2010/02/clear-statistics-hp-procurve-switch-without-reboot/#comments</comments>
		<pubDate>Tue, 23 Feb 2010 12:57:52 +0000</pubDate>
		<dc:creator>Arjan Jorink</dc:creator>
				<category><![CDATA[Switches]]></category>
		<category><![CDATA[CLI]]></category>
		<category><![CDATA[Switch]]></category>

		<guid isPermaLink="false">http://www.jorink.nl/?p=27</guid>
		<description><![CDATA[It is useful to be able to clear all counters and statistics without rebooting the switch when troubleshooting network issues. The clear statistics global command clears all counters and statistics for all interfaces except SNMP. You can also clear the counters and statistics for an individual port using the clear statistics &#60;port-list&#62; command. clear statistics [...]]]></description>
			<content:encoded><![CDATA[<p>It is useful to be able to clear all counters and statistics without rebooting the switch when troubleshooting network issues. The clear statistics global command clears all counters and statistics for all interfaces except SNMP.</p>
<p>You can also clear the counters and statistics for an individual port using the clear statistics &lt;port-list&gt; command.</p>
<blockquote><p>clear statistics &lt;&lt;port-list&gt; | global &gt;</p></blockquote>
<p>When executed with the &lt;port-list&gt; option, clears the counters and statistics for an individual port.When executed with the global option, clears all counters and statistics for all interfaces except SNMP. The show interfaces [&lt;port-list&gt;] command displays the totals accumulated since the last boot or the last clear statistics command was executed. The menu and web pages also display these totals.</p>
<p>SNMP displays the counter and statistics totals accumulated since the last reboot; it is not affected by the clear statistics global command or the clear statistics &lt;port-list&gt; command. An SNMP trap is sent whenever the statistics are cleared.<br />
<strong><br />
Note<br />
The clearing of statistics cannot be uncleared.</strong><!-- PHP 5.x --></p>
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