All posts in: Cisco Switch

Configure Cisco NTP

Configure NTP on Cisco


This article explains you in detail about NTP configuration on Cisco devices. There are two ways to configure. First I explain about simple NTP configuration without authentication. Second, I explain about NTP configuration with MD5 authentication that is more secure than first one.

Cisco Switch is not prompting for enable password


If you experience something like your Cisco Switch or Router is not prompting for enable password and directly logs into privilege mode then you have configured “privilege level 15” for the user account. 

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Recover Cisco Switch Ports from err-disabled State


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

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Find out bandwidth used on Cisco Switch


#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?


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


To display Cisco debug output on the current SSH or Telnet session switch# logging on        // enabled by default switch# logging monitor     //command to enable logging on VTY lines switch# terminal monitor    //unless you issue this command, you cannot see logs on your SSH or Telnet sessions. ..

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Why VLAN line protocol is down?


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 MTU 1500 ..

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How to block specific MAC address in Cisco Switch


(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


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


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

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