09-17-2013 08:52 AM - edited 03-07-2019 03:31 PM
Hi Everyone,
Seems i am tracing server connection on switch i do the ping from directly connected switch where server is connected.
sh ip arp 192.168.20.10
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.98.10 3 0019.b9d1.d4a5 ARPA Vlan27
I can see the mac address of the server is 0019.b9d1.d4a5.
When i do
#sh mac address-table address 0019.b9d1.d4a5
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
27 0019.b9d1.d4a5 DYNAMIC Gi1/1
47 0019.b9d1.d4a5 DYNAMIC Gi1/0/25
i traced the server is directly connected to the switch port Gi1/1.
Need to confirm that sh ip arp shows how switch see how server is connected layer 3 wise and sh mac add table addess shows how switch is learning server mac as layer 2 wise right?
Regards
MAhesh
09-17-2013 12:12 PM
Hi Mahesh,
"show ip arp " will provide you the IP address mapping to MAC addresses whereas "show mac address-table" gives you from which switch port the MAC address is learning from & whether it is static or dynamically learn MAC address.
In your case why same MAC address learn via two different switch ports on two different vlan ?
HTH
Rasika
09-17-2013 01:31 PM
Hi Rasika,
Seems then both commands are provinding the layer 2 info.
i am trying to find why switch is learning mac from two different ports
Regards
Mahesh
09-17-2013 01:35 PM
Looks like your sever having multiple connections. I would physically inspect the server end & ensure how many cables connect back to network. In that way ensure which physical port it should learn in normal condition.
Then if you suspect other port is wrong (eg G1/0/25) see what is connected to G1/0/25 physically. trace it back to see where it end up with.
HTH
Rasika
09-17-2013 01:41 PM
Hi Rasika,
Seems server vlan is bridged to Transparent Firewall vlan.
So second vlan is of transparent fw.
As transparent fw is layer to only
Regards
Mahesh
09-17-2013 01:45 PM
Are you having an issue with this ? I would think if you see a MAC address learning from two different switchport switch will get confused where to forward the traffic (MAC address instability)
09-17-2013 02:34 PM
No issues i was trying to trace the path from server to its gateway in order to find how many firewalls are in between as
i need to open ACL.
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