CISCO MAC ADDRESS IS 00 00 00 MAC

CISCO MAC ADDRESS IS 00 00 00 MAC

We have talked about mac addresses used in multicast world and the 32 same ip addresses that is used with the same mac addresses. CustomerSwitch(config)mac-address-table static interface fastethernet 0/18 vlan 1. The MAC address is used in the example statement only. Use the address that was recorded for H1 in Step 7. In this lesson, we have learned an important lesson of multicast technology. Set up a static MAC address on the Fast Ethernet interface 0/18. For another Multicast MAC, there are another 32 ip addresses certainly. This is tru for all these 32 ip addresses. These Multicast IP Addresses that can be used with this created MAC Address are given below:įor example like 224.255.0.1 multicast ip address, 230.127.0.1, 232.255.0.1, 238.255.0.1 ip addresses will also use the same MAC that we have produced. Here, with the 5th, 6th, 7th, 8th and 9th bits, 32 different Multicast IP Addresses can be written. A switch, which is a data link layer device, uses MAC addresses to forward. So, 2^5, you can create 32 different IP address with this changable area.įor our example, the Multicast IP addresses that share the same Multicast MAC Address are showed below. A Media Access Control (MAC) address is a unique 48-bits data link layer address represented in hexadecimal format that is assigned to every device that connects to a network. What is the problem The one MAC (00.4) have more IP addres. And the remainning 5 bits in the middle can be any value. Range or Prefix Application Notes 01:00:0C:00:00:00: Inter Switch Link (ISL) 01:00:0C:CC:CC:CC: CDP (Cisco Discovery Protocol), VTP (VLAN Trunking Protocol. On switch C6506 in 'sh ip dhcp binding' table are the long MAC addres. The last 23 bits are used for Multicast MAC Address. However, the switch forwards traffic that is sourced. The syslog message indicates that the switch refuses to learn the invalid address. This MAC address is an invalid source MAC. It is 25 bits.Ĥ) Lastly, we will combine the fixed 25 bits with the last 23 bits of the multicast ip to create our Multicat MAC Address :Ġ0000001:00000000:01011110:0 1111111.00000000.00000001 = 01:00:5e:7F:00:01įor Multicast IP Address, the first 4 bits are fixed, these first four bits are 1110. The switch generates the Filtering Ethernet MAC address of value zero syslog message when the switch receives packets with a source MAC address of 00-00-00-00-00-00. Source MAC AddressSelect Any if all source addresses are acceptable or User defined to enter a source address or range of source addresses.

3) We will take the fixed part of the Multicast MACs like below and we will write it in binary format. In this example since 1111 1111 FF, the mask would be written: as 00:00:00:00:00:FF. is an American multinational technology conglomerate headquartered in San Jose, California, in the center of Silicon Valley.

Cisco mac address is 00 00 00