<div dir="ltr">1. Sounds like you're running per-VLAN spanning tree. That won't scale.<div>Investigate MST instead.</div><div><br></div><div>2. Friends don't let friends run large L2 networks to start with. its a large shared-fate fault domain and doesn't really scale that well.</div>
<div><br></div><div>3. Cisco doesn't put catalyst 3750s in data centre designs and for good reason. It may be the 'best' of the C3K family but as you've found its restricted to 1K VLANs. There isn't a SDM Template that increases this.</div>
<div><br></div><div>4. Dare I suggest it but investigate alternatives to this. There's no reason in 2013 to have blocked links, pretty much every vendor has a MLAG-like thing, even Cisco, just not on C3K.</div><div><br>
</div><div>Other people here are suggesting q-in-q. I'd suggest against that. Reality is you have a switch with an anemic MAC table size and all you're doing is making troubleshooting harder doing that. Hitting VLAN limits implies you're doing "VLAN per customer", in its default SDM template its a 6K MAC table, with "router per customer" and 1 VM per customer you're at 2 MAC addresses/VLAN so likely you're already well on the way to exhausting the MAC table since its not a perfectly utilized resource.</div>
<div><br></div><div><br></div><div>cheers,</div><div><br></div><div>lincoln.</div><div><br></div></div><div class="gmail_extra"><br clear="all"><div><span><font color="#888888"><br><span><font color="#888888">Lincoln Dale | Principal Engineer, Arista Networks Inc. | <a href="mailto:ltd@aristanetworks.com" target="_blank">ltd@aristanetworks.com</a><br>
au did: </font></span></font></span><span><font color="#888888"><span><font color="#888888"><a value="+14085475782">+61 3 9999 7442</a></font></span></font></span><span><font color="#888888"><span><font color="#888888"> | m: </font></span></font></span><span><font color="#888888"><span><font color="#888888"><a value="+61417457965">+61 417 457 <span>965</span></a></font></span></font></span><span><font color="#888888"><span><font color="#888888"> | us did: <a value="+14085475782">+1 408 547 5782</a> <a value="+61417457965"><span></span></a>
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<br><br><div class="gmail_quote">On Mon, Dec 16, 2013 at 2:20 PM, James Mcintosh <span dir="ltr"><<a href="mailto:james.mcintosh@rocketmail.com" target="_blank">james.mcintosh@rocketmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:times new roman,new york,times,serif"><div>Hi Noggers,</div><div><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
What are people doing about hitting switch VLAN limits? We terminate a lot of Ethernet services from several carriers. Our Cisco switch gear is great but limited to 128 spanning tree VLAN sessions and 1,000 VLANs.</div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
<br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">We've long since passed the <span style="font-size:12pt">128 per-VLAN spanning tree
limit. We're now getting closing in on 1,000 VLANs.</span></div><div style="font-style:normal;font-size:12pt;background-color:transparent;font-family:'times new roman','new york',times,serif"><span style="font-size:12pt"><br>
</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif"><span style="font-size:12pt">I'm sure there are service providers on list who are much larger than we are and have solved this problem.</span></div>
<div style="font-style:normal;font-size:12pt;background-color:transparent;font-family:'times new roman','new york',times,serif"><span style="font-size:12pt"><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
<span style="font-size:12pt">Would love to hear thoughts on the best approach.</span></div><div style="font-style:normal;font-size:12pt;background-color:transparent;font-family:'times new roman','new york',times,serif">
<span style="font-size:12pt"><br></span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif"><span style="font-size:12pt">Just to give a bit more detail - we aggregate all our upstream carrier circuits on the Cisco switch then trunk the customer VLANs to the appropriate router for termination.</span></div>
<span class="HOEnZb"><font color="#888888"><div style="font-style:normal;font-size:12pt;background-color:transparent;font-family:'times new roman','new york',times,serif"><br></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:'times new roman','new york',times,serif">
-James</div></font></span></div></div><br>_______________________________________________<br>
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