how to show mac address table on cisco switch

This command makes STP skip a few initial steps (unnecessary steps, in this circumstance) on the selected port.' (taken from ). With this feature, the STP for this port assumes that the port is not part of a loop and immediately moves to the forwarding state and does not go through the blocking, listening, or learning states. adminN3550-F(switch:myswitch)> show mac-address-table Address Input. Cisco added the PortFast or fast-start feature. The switch and mux of the Cisco Nexus 3550-F Fusion (formerly ExaLINK Fusion). There is no reason to make the workstation wait 30 seconds while the switch checks for loops if the workstation cannot cause a loop. These connections are considered leaf nodes. If you connect a workstation or a server with a single NIC card or an IP phone to a switch port, the connection cannot create a physical loop. This entire STP initialization process takes about 30 seconds. If the port is not part of a loop, the port proceeds to the learning state, in which the port learns which MAC addresses live off this port. The blocking mode means that the port does not send or receive user data in order to eliminate loops. If the port is part of a loop, the port can be chosen to go into blocking mode. The switch especially wants to know whether this port is part of a physical loop. During the listening state, the switch tries to determine where the port fits in the spanning tree topology. By default, the port spends approximately 15 seconds listening and 15 seconds learning. 'Spanning Tree Protocol dictates that the port starts out blocking, and then immediately moves through the listening and learning phases. Command Default No default behavior or values. arp ipaddress Syntax Description ipaddress (Optional) Shows the ARP table or the mapping for a specific IP address. There is a guideline to do so, please read CISCO Guideline carefully before doing this.This is caused by the Cisco switch having Spanning Tree Protocol turned on, and the Spanning Tree check takes too long, causing the connection to time out. To display the contents of the Address Resolution Protocol (ARP) table, use the arp command in boot loader mode.

The switch sees the MAC address of PC-D in the incoming frame on port 4.

In Figure 7-17, PC-D is replying to PC-A. We also can stop leaning mac addresses from a particular interface or vlan. When the MAC address table of the switch contains the destination MAC address, the switch is able to filter the frame and forward out a single port. If you want to check mac address for a particular port number, then you can use “ show mac address-table interface Total Mac Addresses for this criterion: 1 Cisco-SW#show mac address-table address 0050.7966.6800 If you know the specific mac address, then you can use below command to check mac address entry for that address using “ show mac address-table address “. First of all checking the mac address table by using “ show mac address-table“. To manage mac address table, we need to know a couple of commands in Cisco Catalyst switches.

How to show mac address table on cisco switch