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	<title>Fly Zone &#187; switch</title>
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	<description>Do not, for one repulse, give up the purpose that you resolved to effect.</description>
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		<title>STP防护机制介绍</title>
		<link>http://flyxj.cn/archives/stp-protective-mechanism-intro</link>
		<comments>http://flyxj.cn/archives/stp-protective-mechanism-intro#comments</comments>
		<pubDate>Wed, 09 Mar 2011 16:59:18 +0000</pubDate>
		<dc:creator>flyxj</dc:creator>
				<category><![CDATA[Network]]></category>
		<category><![CDATA[bpdu]]></category>
		<category><![CDATA[cisco]]></category>
		<category><![CDATA[Filter]]></category>
		<category><![CDATA[guard]]></category>
		<category><![CDATA[loop]]></category>
		<category><![CDATA[portfast]]></category>
		<category><![CDATA[stp]]></category>
		<category><![CDATA[switch]]></category>

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		<description><![CDATA[BPDU Guard：如果接口启用STP PortFast特性，那么当该接口接收到任何BPDU的时候，BPDU Guard能够使其进入“err-disable”状态，需要配置errdisable recovery后才可自动恢复。 SW(config)#[no] spanning-tree portfast bpduguard default //所有配置了PortFast的端口启用BPDU Guard or SW(config-if)#spanning-tree portfast SW(config-if)#spanning-tree bpduguard enable &#124; disable %SPANTREE-2-RX_PORTFAST: Received BPDU on PortFast enabled port. Disabling FastEthernet0/2. %PM-4-ERR_DISABLE: bpduguard error detected on Fa0/2, putting Fa0/2 in err-disable state SW(config)#errdisable recovery cause bpduguard SW(config)#errdisable recovery interval 30 //30秒后恢复 %PM-4-ERR_RECOVER: Attempting to recover from bpduguard err-disable [...]]]></description>
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		<title>Storm Control 测试</title>
		<link>http://flyxj.cn/archives/storm-control-example</link>
		<comments>http://flyxj.cn/archives/storm-control-example#comments</comments>
		<pubDate>Fri, 04 Jun 2010 15:46:21 +0000</pubDate>
		<dc:creator>flyxj</dc:creator>
				<category><![CDATA[Network]]></category>
		<category><![CDATA[arp]]></category>
		<category><![CDATA[attacker]]></category>
		<category><![CDATA[catalyst]]></category>
		<category><![CDATA[cisco]]></category>
		<category><![CDATA[switch]]></category>

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		<description><![CDATA[storm-control 可以用来控制网络中报文发送数量，防止数据风暴产生，在思科 Catalyst 3560 上测试了一下，利用 WinARPAttacker 产生 ARP 广播，其速率超过接口设定的门限值。利用这一点，可以在思科交换机上实现对一些网络攻击起到防范作用。 配置、现象如下： SW3560(config-if)#storm-control ? action Action to take for storm-control broadcast Broadcast address storm control multicast Multicast address storm control unicast Unicast address storm control SW3560#show running-config int f0/10 Building configuration… Current configuration : 153 bytes ! interface FastEthernet0/10 switchport mode access storm-control broadcast level pps 10 [...]]]></description>
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