I am trying to understand how far can 3750 support SVI. According to the default SDM, it can only support 8 routed interfaces. I am trying to identify what does it mean by that. That does refer to routed port only or both routed port and SVI? Also, what if I create more than 8 SVIs? Will that be an issue? Thanks.
3750#sh sdm prefer
The current template is "desktop default" template.
You can configured more than 8 SVI and physical routed interface. But the switch performance is optimized on 8 routed interfaces, such as TCAM resource. If you configure more, the switch might have performance issue.
So what they are saying here is routed interfaces both includes routed ports and SVI? Like for example I can do 4 routed ports and 4 SVI. Then adding another SVI might cause performance issue.
I also saw this note from Cisco's website which says.
"If the switch attempts to boot up with a configuration that has more VLANs and routed ports than hardware can support, the VLANs are created, but the routed ports are shut down, and the switch sends a message that this was due to insufficient hardware resources. "
To answer your specific question, yes we optimise the performance to 8
routed (SVIs and Phy) interfaces "combined"
There were some internal testing done with this platform and although I
cannot publish the details I can confirm that actually you will not see any problem and the switch will function correctly under a greater number of SVIs (128), but with the routing "template". Anyhow, if you plan to use this 3750 for routing, L3 ports, SVIs and some routes in the table you may want to switch to the routing sdm template
Well, that's hard to answer, I guess it all depends on what you need the 3750 to take care of (in terms of routing) but I have certainly seen these switches performing well with a couple more L3 interfaces.
So it seems that you won't need the routing template unless doing PBR or handling a huge routing table like BGP.
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