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#Edgerouter show mac address table for mac
#Edgerouter show mac address table software
#Edgerouter show mac address table mac

If you don’t have Cisco, you may use LLDP (standard), but not all devices support it and most don’t have it enabled. Important Note: CDP works only between Cisco devices and may be turned off.

#Edgerouter show mac address table mac

If you see just one MAC address then you are safe to go, otherwise you may want to check the device physically.

#Edgerouter show mac address table for mac

Instead of checking it for MAC address, you check based on the port. Now, we can connect to this device and repeat the process from checking the MAC address table.Īnother thing you can do to ensure there is just this device connected on a port is checking the MAC address table for that port. Here, we are looking at the management address, which is 10.30.0.11.

#Edgerouter show mac address table software

Interface: GigabitEthernet1/0/1, Port ID (outgoing port) GigabitEthernet0/1Ĭisco IOS Software, 3750 Software (C3750-K9-M), Version 12.4, RELEASE SOFTWARE (es9)Ĭopyright (c) 1986-2009 by Cisco Systems, Inc.Ĭompiled 06-Mar-09 15:38 by prod_rel_team Platform: Cisco 3750, Capabilities: Router Switch IGMP Otherwise, it will look like this: Dallas-CORE# show cdp neighbor detail gi0/1 If we have no neighbor, show cdp neighbor detail will show no output. CDP is a Cisco-proprietary protocol that allows you to discover other Cisco devices in the network, if they are directly connected. We need to be sure of that, and we can do that by checking CDP. However, we are still not sure if the device is directly cabled in that port or not. Now we know where the traffic from this device is coming from.

Here, we are looking at the port, which is Gi0/1. Find the way yourself by using ? if needed. Some may want the address keyword, some others may not. Some devices may want mac-address-table, others mac address-table. The syntax may be different from model to model. Dallas-CORE# show mac address-table address 0007.ECB2.7A02 The output will be something like the one below. We can do that by checking the MAC address table with show mac address-table address, or 0007.ECB2.7A02 in our case. The next step is to identify where the MAC address is coming from. Here, we found the MAC address 0007.ECB2.7A02. Furthermore, not all devices will have the same output, but they will all give you IP and MAC address at least. It is just the interface the MAC address comes from. Don’t be fooled by the interface, this is not necessarily the interface where the device is connected. Here, we are looking at the MAC address, the one with the notation. Dallas-CORE# show ip arp | include 10.43.11.91

Imagine our target IP is 10.43.11.91, we can do the following. We need to inspect the device and get the MAC address from it.Īfter pinging, you can check the ARP table with show ip arp | include. If it does not ping, there is nothing we can do. Instead, we ensure it is there by pinging it: we wake him up. If the device was silent, the switch may have removed its MAC address from the ARP table. This is important because the device might have been silent for a while. Now that we are on the correct device, we need to ping our target IP address. If you connect to any other device, it might not have this detail in the ARP table, and you won’t go any further. Furthermore, it is a device in that network you (as a network administrator) have access to.īeing in the same network means being able to see MAC addresses, and knowing MAC addresses allows you to locate the devices. This device is the one all devices in the network sends traffic to when the want to communicate with the outside world. It is mandatory to connect to the default gateway. It is important we get the first step straight, otherwise we won’t go far. Finding a device, the details Connect to the default gateway Otherwise, it might be behind a switch which is not manageable, or on a virtualized host like VMware ESXi.Īnd this is it! Still confused? Don’t worry, we will cover all these steps in detail just below. Use show mac address-table interface and check how many MAC addresses you see.

If you see no output from the previous step, probably the device is right there on this port.

In this case, connect to that switch and repeat from Step #3. If this command outputs something, it will also tell you the management address of the switch connected. Here, use the port we found in the previous step.

Check if you have some switches connected to that port with show cdp neighbor detail.

Use show mac address-table address, where the is the one we found in the previous step.

Here, you will see the MAC address of such device, then:

Use show ip arp | include, where is the IP of your target device.

Connect to the device that acts as default router for the target network and ping your target IP.

Steps to find a device in a network using the MAC address table and the ARP table.