Category Archives: Cisco

Configuring Cisco Virtual Switch System (VSS) on Cisco Catalyst 4500X Switches.

Posted on August 12, 2017 by jbernec

As part of a network infrastructure upgrade at a client site, I’ll be implementing Cisco VSS (Virtual Switching System). This technology will go a long way to meet some of the stated objectives of this infrastructure upgrade which include : … Continue reading →

Posted in Cisco, Virtual Switch System, VSS | Tagged , , , , , , , , , , , , , | 1 Comment

Configuring Date and Time on a Cisco 3750G Layer 3 Switch.

Posted on March 2, 2015 by jbernec

The lower end of Cisco switches e.g the C3750 Layer 3, do not have a built-in system clock mechanism. As a result, the time needs to be set either manually or by an external ntp time source. The configuration below … Continue reading →

Posted in Cisco, Cisco 3750G, Cisco IOS, Cisco Switch, Clock, IOS, NTP, Router, Switch, Telnet, Time | Tagged , , , , , , | Leave a comment

Configuring Windows Server 2012 R2 NIC Teaming with EtherChannel on Cisco 3750G Switch.

Posted on August 11, 2014 by jbernec

Windows Server 2012 R2 built in NIC Teaming code enables link aggregation of multiple network adapters with same speeds for outbound traffic from the host. To take advantage of inbound traffic aggregation, the switch ports will have to be configured … Continue reading →

Posted in Cisco, Hyper-v 2012 R2, Network, Network Load Balancing, NIC Teaming, Powershell 4.0, Windows Server 2012 R2 | 1 Comment

Configuring NAT (Network Address Translation) on a Cisco 1921 Router.

Posted on March 11, 2014 by jbernec

These are the steps I would follow to configure NAT (Network Address Translation) on a Cisco 1921 Router. The tool of choice is Putty configured to log the commands. You could use the Cisco IOS context Help to assist with … Continue reading →

Posted in Access-Lists, Cisco, NAT, Network Address Translation, Router | Tagged , , , , | Leave a comment

Configuring InterVLAN Routing on a Layer 3 Switch and providing DHCP to multiple subnets Part 2

Posted on October 16, 2013 by jbernec

In part 2 of this topic, I will show how to configure the Switch Virtual Interfaces and IP Helper addresses on the Cisco 3750G EMI: L3Switch(config)#interface vlan 20 L3Switch(config-if)# ip address 10.0.2.1 255.255.255.0 (Configure IP Address on the vlan 20 … Continue reading →

Posted in Cisco, DHCP, IOS, Router, svi, Switch, Switch Virtual Interface, vlan | Tagged , , | 13 Comments

Configuring InterVLAN Routing on a Layer 3 Switch and providing DHCP to multiple subnets Part 1

Posted on September 26, 2013 by jbernec

In this series, I would like to post my practical experience in setting up multiple VLANs/subnets and using a Layer 3 switch to route traffic across them. The post will also include my configuration steps enabling the use of a … Continue reading →

Posted in Cisco, DHCP, Helper Address, IP, Router, svi, Switch, Switch Virtual Interface, vlan | Tagged , , , , | 3 Comments

How to Configure ssh on a Cisco Switch.

Posted on September 9, 2013 by jbernec

Telnet is a widely used protocol for accessing and administering Cisco devices. But this protocol is not exactly secure and transmits data over a network in plain text. Ssh is a secure protocol and it’s best practice to secure your … Continue reading →

Posted in Cisco, Router, ssh, Switch, Telnet | Leave a comment

Configuring Policy Based Routing on a Cisco 3750G EMI

Posted on September 8, 2013 by jbernec

So we recently restructured the Company network from a flat network to multiple Vlans. The need has arisen to route traffic for specific vlans through a different ISP for business reasons. This means routing traffic to a path different from … Continue reading →

Posted in ASA, Cisco, Firewall, IOS, Router, Switch | Leave a comment