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Forum Replies

  1. Hello Jigar.

    I tried to replicate what you describe here on a Cisco 3560 production switch. I have device with a MAC address and I have statically assigned the MAC address to Gi0/4. I plug the device into interface Gi0/5 but the device has no connectivity. Looking at the MAC address table, I see that the switch has not learned the statically bound MAC address (to interface Gi0/4) on interface Gi0/5. Here is a sample of my output after implementing the static MAC allocation and changing the connection to port Gi 0/5 (the Xs and Ys were added by me for confid

    ... Continue reading in our forum

  2. Hello Wisam.

    I don’t know of a way to do it in one command, but you can do the following:

    Step 1: To determine the MAC address of the device connected to Fa0/10, use the following command:

    Switch#show mac address-table | include fa0/10

    This will give you a list of MAC addresses associated with that port. If you only have one device on this port, only one MAC address will show up.

    Step 2: To determine the IP address associated with the MAC address you found, use the following command:

    Switch#show arp | include XXXX.YYYY.ZZZZ

    where XXXX.YYYY.ZZZZ is the MAC add

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  3. @Ananth On a LAN, we use Ethernet and each device has a built in MAC address. You don’t have to configure the MAC address yourself. Let’s say you have two computers connected to a switch. These computers will have a MAC address, it comes with their network cards.

    These computers however don’t communicate directly with Ethernet, they use IP instead. You’ll have to configure an IP address on each computer and it has to be in the same subnet. When ComputerA wants to send something to ComputerB, it will create an IP packet with its own IP address as the source and

    ... Continue reading in our forum

  4. Hello Azm

    The MAC address you see in the output of the show interface command is the MAC address of the switch’s physical port. Conversely the MAC addresses that populate the MAC Address Table are those of the devices connected to the switch. Cisco switches are designed to have a se

    ... Continue reading in our forum

  5. thank you, Laz. It makes sense.

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