Please let us know whether you want to deny the traffic or permit it. Are both subnets on the same router or exists in different ones.If on different then router 2851 hosts which subnet and on what port.
The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces on the switch is 1500 bytes. You can increase the MTU size for all interfaces that operate at 10 or 100 Mbps with the system mtu global configurati...