All posts in: Cisco Switch

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Recover Cisco Switch Ports from err-disabled State

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How to view and recover Cisco Switch ports from err-disabled state

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Find out bandwidth used on Cisco Switch

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#show interface summary command provides bandwidth utilization of each Cisco switch interface, VLAN and port channels. You can either measure bits per sec using RXBS/TXBS fields or packets per sec using RXPS/TXPS fields. Additionally you also get to know counts of pkts dropped in the interface.   ..

POE, POE+ vs UPOE: What’s the difference?

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You need to calculate the power requirements for all the powered devices that you plan to connect to switch. Also be careful while laying longer network cable, as some power is lost over the length of cable.

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Display debugging on ssh session or console

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To display Cisco debug output on the current SSH or Telnet session, switch# terminal monitor To turn off Cisco debug output switch# terminal no monitor   To display Cisco debug output on the Console switch# logging console To turn off Cisco debug output switch# no logging console

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Why VLAN line protocol is down?

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On Cisco switches, after creating a new VLAN, we have noticed that VLAN interface is up however protocol doesn’t come up. MTSTJCORESW#sh int vlan 10 Vlan10 is up, line protocol is down Hardware is Ethernet SVI, address is 00fe.a5c8.c9ce (bia 00fe.a5c8.c9ce) Internet address is 10.10.10.1/24 MTU 1500 ..

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How to block specific MAC address in Cisco Switch

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(config)# mac address-table static 0349.1245.95ca vlan 192 drop just repeat with as many VLANs that you wanted to deny access for the specific MAC address

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EtherChannel Configuration

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About EtherChannel: You can configure maximum 8 ports in single port-channel. All ports in the port-channel should be of same type (Fast Ethernet or Gigabit Ethernet), same speed, same duplex settings. In addition, incase of trunk port-channel, same VLANs and native VLAN should be permitted. It is advisable ..

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Configure DHCP Server on a Cisco switch or router

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Configure Layer3 address on a switch interface that correlates with DHCP address scope. (config) # interface vlan 5 (config-vlan)# ip address 192.168.5.1 255.255.255.0 (config-vlan)# no shut (config)#ip dhcp pool users (config-dhcp)#network 192.168.5.0 255.255.255.0 (config-dhcp)#default-router 192.168.5.1 ..

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Know about Cisco Switch and Router

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Difference between enable secret password and enable password? enable secret password encrypts the password automatically using MD5 hash algorithm. enable password doesn’t encrypt the password thus stores in clear text. But using service password-encryption command at global config mode encyrpts ..

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Configure SSH in Cisco Switch

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Step 1: Setup hostname, domain-name and Management IP address (config)# hostname corp-sw-01 (config)# ip domain-name itadminguide.com (config)# interface vlan 101 (config-if)# ip address 172.20.101.1 255.255.255.0   Step 2: Generate RSA key (config)# crypto key generate RSA The name for the keys ..

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