Core networks

[BobGreer65666]

Hi there,

Thanks for reading.  I'm just double checking cause I can't be wrong on this:

I can check my core switch for SVIs & routes to determine ALL routable networks in my small organization.

Thanks again!

Bob

[Reza Sharifi · Accepted solution]

Hi Bob,

Yes, you can. "sh ip route" on the core switch should show you all the routes you are receiving. It should also show you the SVIs IP as connected networks. "sh run" will also show you the configured SVIs and their IPs.

HTH

[balaji.bandi]

Sure it May be or May not be, Depends on the design, if this is Collapsed Core and Access Layers are Pure Layer 2, so most of the Layer 3 SVI will be on Core.

you can check :

show ip interface brief - if will show you all the layer3 VLAN configured interface on the core

[Joseph W. Doherty]

Maybe not.  This is a "it depends" answer.

For example, if you have a static route to 0.0.0.0 or even 192.168.1.0/24, what's downstream as a network or networks for either?  I.e. what if downstream there's 192.168.1.0/25 but not 192.168.1.128/25?  How do you know?  Do you care?

Or if use a routing protocol, is 192.168.1.0/24 a summary?

Other L3 switches can host SVIs.  They, and routers (and some hosts), can host networks not defined by SVIs.

[BobGreer65666]

Thanks to everybody who responded!