10-22-2013 10:46 PM - edited 03-07-2019 04:10 PM
Hi,
I have a switch 4500 as a Core and dhcp server. In this I have a dhcp pool for the vlan 111.
I have an other switch, 3560. In this I have one port assigned to the vlan 111. When I connect a computer to this port, the computer get a ip, but I can ping the gateway. I look for the computer's mac address with "sh mac address-table" command and I find the mac with the port, but if I look for the same mac in the "core" with the "sh ip dhcp bind" command, I realize that the mac is diferent:
siwtch access:
access(config-if)#do sh mac add | include Gi0/1
111 2c41.380f.60cf DYNAMIC Gi0/1
switch core:
core0#sh ip dhcp bi
192.168.111.124 012c.4138.0f60.cf Oct 24 2013 12:14 AM Automatic
the problem is only with two computers in all the ports of this switch, but if I connect the same computer in other switch in the same LAN it works without problems.
Do you have any idea??
I think the dhcp pool is properly configured because with others computers in other port with the same vlan works perfect!!!
10-23-2013 01:33 AM
Hi try this command to cleAr DHCP bindings:
Clear ip dhcp bind A.B.C.D
And then check it again with
Show ip dhcp bind
Regards
Sent from Cisco Technical Support iPhone App
10-23-2013 08:25 AM
Hi,
I have already tried with this command, but is the same. The mac address and the ip are the same.
Thanks
Sent from Cisco Technical Support iPhone App
10-23-2013 08:33 AM
What is the exact interface configuration?
10-23-2013 08:39 AM
Switchport mode access
Switchport access vlan 111
Switchport voice vlan 140
Before this conf, I had a portsecurity with max 2 and I realized that the port was in err-disable.
But now that the port only has the vlan voice and the vlan access configuration, the port isnt in err-disable but it doesnt work.
Thanks
Sent from Cisco Technical Support iPhone App
10-23-2013 09:20 AM
Hi Carlos,
are you, by any chance, running any multicast?
Because this seems like multicast mac-address (If im correct, it starts with 01) doubt it is a valid host's mac address.
core0#sh ip dhcp bi
192.168.111.124 012c.4138.0f60.cf
Best regards,
Jan
10-23-2013 09:46 AM
Hi,
Yes I have a IPICS connected to the 4500.
But this mac address is a computer. Is it normal that appears lile this?
And why it cant ping to its gateway?
Sent from Cisco Technical Support iPhone App
10-23-2013 10:06 AM
Hi Carlos,
I am sorry, but the MAC addresses are the same and that is not multicast address, my mistake.
The first two numbers are media type (ethernet, in your case)
http://www.freesoft.org/CIE/RFC/1700/24.htm
2c41380f60cf access sw
012c41380f60cf core sw
access(config-if)#do sh mac add | include Gi0/1
111 2c41.380f.60cf DYNAMIC Gi0/1
switch core:
core0#sh ip dhcp bi
192.168.111.124 012c.4138.0f60.cf Oct 24 2
So the problem is somewhere else, the mapping is correct.
Best regards,
Jan
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: