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Core networks

BobGreer65666
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

Reza Sharifi
Hall of Fame
Hall of Fame

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

View solution in original post

4 Replies 4

Reza Sharifi
Hall of Fame
Hall of Fame

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
Hall of Fame
Hall of Fame

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

 

BB

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Joseph W. Doherty
Hall of Fame
Hall of Fame

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
Level 1
Level 1

Thanks to everybody who responded!