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

[Aaron Gould]

Are you talking about like this ?


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

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