09-13-2018 01:58 PM - edited 03-05-2019 10:55 AM
Hi Please see the below. Why one mac address is associated with three vlans: 2, 3 and 4? Thanks
m# sh ip arp | i 10.1.1.13
10.1.1.13 0.2309 0011.0022.0033 Vlan2
m# sh mac address-table | i 0011.0022.0033
2 0011.0022.0033 dynamic ~~~ F F vPC Peer-Link
3 0011.0022.0033 dynamic ~~~ F F vPC Peer-Link
4 0011.0022.0033 dynamic ~~~ F F vPC Peer-Link
09-13-2018 02:03 PM - edited 09-13-2018 02:05 PM
you have 2 7K in VPC ? post full configuration to look.
Did any of the box reloaded, what is the NEXUS OS running ?
09-13-2018 02:05 PM
Hello,
That mac address could be used by a device with multiple IPs on tagged NIC. For example a router or a firewall with subinterfaces could fall into this category. You could track down the mac addresses and see if all of them end up at the same trunk port. Another reason could be a bridge between the vlans. But you really should track them down and see which device is using them.
HTH,
ADP
09-14-2018 11:59 AM
I think you are right. When tracking them down, i can find these three vlan are connected to the same physical port which is connected to a firewall. so this mac would be from the NIC of the firewall port
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide