[c-nsp] Basic IP to Port finding question on Cisco 3850

[Lee]

On 7/26/17, Aaron Gould <aaron1 at gvtc.com> wrote:
> Are you talking about like this ?

does "show ip arp 10.101.15.21" work?
Lee

>
>
> 3750#sh ip arp vlan 4000
> Protocol  Address          Age (min)  Hardware Addr   Type   Interface
> Internet  10.101.15.1           171   4055.3970.f265  ARPA   Vlan4000
> Internet  10.101.15.7           171   0cd5.02c0.cd4c  ARPA   Vlan4000
> Internet  10.101.15.16            -   0013.8039.eac1  ARPA   Vlan4000
> Internet  10.101.15.21          185   001c.5779.d841  ARPA   Vlan4000
>
> 3750#sh mac address-table dynamic | in 4055.3970.f265
> 4000    4055.3970.f265    DYNAMIC     Gi1/0/26
>
> -Aaron
>
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Scott Granados
> Sent: Wednesday, July 26, 2017 11:16 AM
> To: cisco-nsp <cisco-nsp at puck.nether.net>
> Subject: [c-nsp] Basic IP to Port finding question on Cisco 3850
>
> I think this is a basic question but Googling has not helped me much so I’m
> hopeful someone can shed the clue light on me a bit.
>
> I’m trying to find the specific port an IP address is attached to on a 3850
> in L3 mode with SVI interfaces.  SO for example if I do a show arp a.b.c.d
> I’ll get the MAC and the SVI attached.  If I do a show VLAN ID X I see the
> port members but there are many, let’s say 10 or more per VLAN.  Is there an
> easy way to detect which port either the IP is received on or the MAC
> address that is displayed in the show arp?  Everything I’m doing seems to
> show the SVI that’s in play but not the specific gig port that the device is
> attached to and mapped to the VLAN as a member.  This seems like the sort of
> thing that would be easy to figure out but I’m stumped.  Any pointers would
> be most appreciated.
>
> Thanks and sorry for such a rudimentary question.
>
> Scott