Another beginner tip that can be useful!
When you work on the Cisco Router or Catalyst Switch console, it would be annoying to have the console or terminal (telnet/ssh) logs to pop in between your commands. This can be even more irritating when it is busy switch or a router spitting messages continuously.
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Posted on Apr 20, 2008 under Cisco |
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catalyst Cisco DTP switch trunk
In Cisco Catalyst switches, each switchport can be set to different VLAN Membership modes using the "switchport mode" command. This sets the port unconditionally.
The different modes include
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VoIP Hopper is a Unix/Linux based free opensource security tool that rapidly runs a VLAN Hop into the Voice VLAN on specific Ethernet switches. VoIP Hopper mimicks the behavior of an IP Phone, in both Cisco and Avaya IP Phone environments to hope into the Voice VLAN. VoIP Hopper is both a VLAN Hop test tool and a tool to test VoIP infrastructure security.
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The Day Light savings time kicked in today in the UK today and it is this part of the year (and when the GMT kicks back in) we do a sanity check on all the Network Devices, Appliances and Servers for time.
It is important to set the time appropriately on the devices as an incorrect time on the devices can cause authentication issues and ofcourse incorrect time stampls on the logs.
You can enable the Day Light Savings time in Cisco IOS. This just takes a couple of commands from the Global Configuration mode.
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While no security is fool proof, it is important that we do as much as we can to ensure maximum protection on our netowrk devices like Routers and Switches. Cisco IOS has enhanced Login restriction features which can control login attempts to it. This includes time delay between failed login attempts, block period after a set of failed login attempts and audit logs of successful and failed login attempts.
These login restrictions provides more control and make it that more harder for unauthorised accesses and prevent against Dictionary based DoS attacks.
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One of the basic configurations when setting up a Cisco Router or a Cisco Switch is setting the passwords. This includes, setting the passwords for the Console, Telnet/SSH and the Enable (Enable Secret)
The following procedure will help starters set up passwords in Cisco Routers and Switches running Cisco IOS.
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Trunk Ports are switchports on Cisco switches that interconnect switches. The trunk port carries traffic for all the VLans across the switches it interconnects. switchport can be enabled and configured as trunks without much trouble.
The following procedure helps setting a switchport into a Trunk port with 802.1q encapsulation.
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