getting duplicate packets when pinging any network wih Meraki switches

[RbradComms]

we have started to introduce Meraki Switches in our networks.

when I ping a remote subnet( from a Cisco Nexus switch) that has Meraki I get duplicate packets, even I ping the Cisco router on that subnet

other subnets at the same site are ok

Any ideas?

Is there some sort of proxy replying?

( router no Meraki)

rmd-sw01# ping 10.24.2.1
PING 10.24.2.1 (10.24.2.1): 56 data bytes
64 bytes from 10.24.2.1: icmp_seq=0 ttl=252 time=1.885 ms
64 bytes from 10.24.2.1: icmp_seq=1 ttl=252 time=1.477 ms
64 bytes from 10.24.2.1: icmp_seq=2 ttl=252 time=1.46 ms
64 bytes from 10.24.2.1: icmp_seq=3 ttl=252 time=1.445 ms
64 bytes from 10.24.2.1: icmp_seq=4 ttl=252 time=1.409 ms

--- 10.24.2.1 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 1.409/1.535/1.885 ms

Router with Meraki Management subnet

rmd-sw01# ping 10.24.24.1
PING 10.24.24.1 (10.24.24.1): 56 data bytes
64 bytes from 10.24.24.1: icmp_seq=0 ttl=252 time=1.796 ms
64 bytes from 10.24.24.1: icmp_seq=0 ttl=250 time=2.074 ms (DUP!)
64 bytes from 10.24.24.1: icmp_seq=1 ttl=252 time=1.576 ms
64 bytes from 10.24.24.1: icmp_seq=1 ttl=250 time=1.802 ms (DUP!)
64 bytes from 10.24.24.1: icmp_seq=2 ttl=252 time=1.582 ms
64 bytes from 10.24.24.1: icmp_seq=2 ttl=250 time=1.793 ms (DUP!)
64 bytes from 10.24.24.1: icmp_seq=3 ttl=252 time=1.446 ms
64 bytes from 10.24.24.1: icmp_seq=3 ttl=250 time=1.643 ms (DUP!)
64 bytes from 10.24.24.1: icmp_seq=4 ttl=252 time=1.652 ms
64 bytes from 10.24.24.1: icmp_seq=4 ttl=250 time=1.735 ms (DUP!)

--- 10.24.24.1 ping statistics ---
5 packets transmitted, 5 packets received, +5 duplicates, 0.00% packet loss
round-trip min/avg/max = 1.446/1.709/2.074 ms
rmd-sw01#

[PhilipDAth]

Are the Meraki switches doing routing, or what is doing routing at the remote sites?

Do you go through the Meraki switch to ping the router?

[RbradComms]

Hi Philip,

No, we Have ISR4000s doing the routing for the 7 Vlans however we do have one routed IP for our voice Vlan to allow IGMP snooping. All the Meraki APs and switches have a dedicated management Vlan Also see the same problem with the Meraki Camera Vlan. Don't get the problem on any of the other non Meraki  Vlans.

the other thing, I only see the problem when pinging from the Nexus switches in the DC.

[RbradComms · Accepted solution]

Hi Philip,

Ignore my last reply.

The problem is the PBR I have setup on the Nexus switches