[c-nsp] 6500 VSS for campus L3 core?

omar parihuana omar.parihuana at gmail.com
Thu Feb 14 11:09:20 EST 2013


I configured a VSS as L3 for Core Campus. In fact I had some issues
regarding VSL links, for this reason we decided to improve the
switch-to-switch communication using Quad-Supervisor. But in Cisco Docs
suggest VSS on aggregation or services switches.


On Wed, Feb 13, 2013 at 11:55 AM, Andy Ellsworth <andy at dar.net> wrote:

> For those of you running 6500 VSS and using the traditional 3-layer campus
> model (core/distro/access) with a layer 3 core...do you use VSS in your
> core?
> We are using VSS in the core and distro layers today, but the more
> $WEIRD_THINGS software bugs we encounter that affect the whole VSS pair on
> our distros, the less inclined I am to keep VSS in the core.
> My thinking is that at the distro layer, you at least get some significant
> benefits for your layer 2 downlinks to your access switches (MEC, no STP,
> no FHRPs). But in the core, where all of your connectivity is
> point-to-point L3 links to distros, we can get all of those same benefits
> with EC + ECMP OSPF (and we don't have anything hitting the core that would
> need FHRPs).
> The conclusion I've come to is that VSS at the distro layer has significant
> benefits with some downsides, while VSS for a L3 core has very few benefits
> but increased risk of software/human error failures.
> Has anyone else gone through this thought exercise?
> -Andy
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Omar E.P.T
Certified Networking Professionals make better Connections!

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