<div dir="ltr"><div>The bridge ID is the bridge priority in hex (default 0xFFFF) followed by the chassis MAC. This is part of the STP specification. The lowest bridge ID is chosen as the root bridge (so the lower the priority value the more likely a device is to become the spanning tree root, and when the priority is equal the lower chassis MAC wins).<br><br></div><div>"VLAN ID" is the VLAN ID for this STP instance (or, often 4094 for the common STP instance in single spanning tree; look for "L2 VLAN ... are members of single spanning tree" in the output).<br><br></div><div>"Root ID" is the bridge ID of the global STP root device<br><br>"Bridge Address" is the chassis MAC of the device you are connected to (not the Bridge ID)<br><br></div><div>"Designated Bridge" is the bridge ID of the local root<br><br></div><div>"Designated Root" is the bridge ID of the global root for this instance<br></div><div><br></div><div><br></div><div>Note that to see rstp info, you need to do 'show 802-1w' which has similar output to 'show span', but drops the redundant "Designated Root" column and adds a "Role" column (which I find a lot easier to understand). STP and RSTP are completely separate on these devices.<br></div><div><br>You might try looking at the output of 'show span detail' and 'show span 802-1w detail' to see if that clears anything up for you.<br><br></div><div>Also, the priority is entered in decimal in the config (so you will probably see a line like: 'spanning tree ... priority 25077' for your device with 61f5 in its bridge id).<br><br></div><div>-- <br></div>Eldon Koyle<br><div><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 16, 2016 at 2:58 PM, Nick Cutting <span dir="ltr"><<a href="mailto:ncutting@edgetg.com" target="_blank">ncutting@edgetg.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Hi I am trying to document the spanning tree domain on a brocade environment that has both TurboIron-X24’s and FCX-48G’s<u></u><u></u></p>
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<p class="MsoNormal">I’m traditionally a cisco guy so need some help in figuring out the show output of show span.<u></u><u></u></p>
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<p class="MsoNormal">Right now we have a mix of rapid spanning tree and classic, I need help in understand which is the mac address of the root bridge, the root ports and the terminology used in the output.<u></u><u></u></p>
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<p class="MsoNormal">For example – is the root ID a mac address and the vlan ID added in Hex? What is the designated bridge ? is this is the downstream switches bridge ID?<u></u><u></u></p>
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<p class="MsoNormal">I can’t seem to match the bridge ID and the Root ID to mac address tables on the switch – is anyone able to shed light on these relationships and describe what each of the terms means below?<u></u><u></u></p>
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<p class="MsoNormal">I’m guessing the first 4 digits of the DES root and DES Bridge are the priorities in HEX<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">STP instance owned by VLAN 501<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Global STP (IEEE 802.1D) Parameters:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">VLAN Root Root Root Prio Max He- Ho- Fwd Last Chg Bridge
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> ID ID Cost Port rity Age llo ld dly Chang cnt Address
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Hex sec sec sec sec sec
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> 501 <span style="color:red">
61f5000d662f3f40</span> 6 1 ffff 20 2 1 15 133406 770 748ef86b37cd<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Port STP Parameters:<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Port Prio Path State Fwd Design
<span style="color:red">Designated </span> <span style="color:red">Designated</span>
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<p class="MsoNormal"><span style="font-family:"Courier New"">Num rity Cost Trans Cost
<span style="color:red">Root</span> <span style="color:red">Bridge</span>
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> Hex
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">1 80 2 FORWARDING 3 4 61f5000d662f3f40 ffff0024387826c0
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">2 80 2 BLOCKING 5 6 61f5000d662f3f40 ffff002438780e80
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">5 80 2 FORWARDING 1 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">6 80 2 FORWARDING 4 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">11 80 2 BLOCKING 7 6 61f5000d662f3f40 8000748ef8f81bc0
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">12 80 2 BLOCKING 5 6 61f5000d662f3f40 8000748ef8f80e40
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">13 80 2 FORWARDING 2 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">14 80 2 FORWARDING 2 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">15 80 2 FORWARDING 2 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">16 80 2 FORWARDING 2 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">17 80 2 FORWARDING 3 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">18 80 0 DISABLED 0 0 0000000000000000 0000000000000000
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">19 80 2 FORWARDING 7 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">20 80 2 FORWARDING 9 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">21 80 2 FORWARDING 3 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">22 80 2 FORWARDING 3 6 61f5000d662f3f40 ffff748ef86b37cd
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">23 80 2 BLOCKING 10 4 61f5000d662f3f40 ffff0024387826c0
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">24 80 2 BLOCKING 10 4 61f5000d662f3f40 ffff0024387826c0<u></u><u></u></span></p>
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<p class="MsoNormal" style="text-align:center" align="center"><b><span style="font-size:10pt">Nick Cutting</span></b><span style="font-size:10pt"> | Network Engineer | Architecture & Standards Team| Office: <a href="tel:203-742-7856" value="+12037427856" target="_blank">203-742-7856</a> | Fax: <a href="tel:203-742-7890" value="+12037427890" target="_blank">203-742-7890</a><u></u><u></u></span></p>
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<p class="MsoNormal" style="text-align:center" align="center"><span style="color:black"><img src="cid:image001.png@01D1AF91.1C6F4CF0" alt="cid:image001.png@01D045E3.7FDE6B40" height="49" width="135"></span><u></u><u></u></p>
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