Posts tagged Cisco
Basic Frame Relay Configuration
Aug 9th
This article shows how to configure basic frame relay without using inverse ARP.
We’ll be using the above topology for the configuration. The IP addresses of the routers are 192.168.1.X, where X is the router number. Read more →
Ping Multiple Addresses Using TCL Script Part 2
Jun 17th
Part 1 of this tutorial showed how to ping multiple IP addresses using TCL script. This tutorial will further refine the script which was in Part 1. Instead of foreach loop, we will be using for loop to make the script shorter.
TCL Script
Here is the sample script
for { set i 1 } { $i < = 10 } { incr i } {
ping 192.168.1.$i re 2
}
Ping Multiple Addresses Using TCL Script Part 1
Jun 13th
There might be situation where you might need to ping multiple IP addresses to check the full connectivity between devices.
This tutorial shows you exactly how to do that using TCL script.
I’ll be explaining how it works in details so you don’t need to have any programming or scripting experience.
Read more →
Enable Telnet Access on Cisco Router
May 16th
This short tutorial shows how to enable telnet access on the router.
Configuration
Use the following commands to enable telnet access to the router.
First check how many virtual terminal router supports.
(Depending on the router model, the output might be different)
Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#line vty 0 ? <1-4> Last Line number
Cisco ūmi Home Telepresence on Your TV Set
Oct 7th
Cisco announced Umi, a video conferencing appliance for typical consumers.
Umi consists of camera mounted to the top of the screen which can capture Full HD 1080p video at 30 frames per second. The camera is connected to a device which act as a internet gateway for the TV.
Umi which is scheduled to be available by November and is expected to cost around $599 with $24.99 monthly service charge for unlimited video calling.
Read more →
Configuring Port Aggregation with EtherChannel
Oct 5th
What is EtherChannel?
EtherChannel is a link aggregation technology used primarily on Cisco switches. It can bundle two to eight physical port of the same Ethernet media type and speed. All bundled ports must have similar configuration.
EtherChannel can be used to increase bandwidth, provide redundancy and load balance traffic
EtherChannel Negotiation Protocols
Cisco supports two EtherChannel negotiation protocols. They are used to provide automatic EtherChannel configuration and negotiation between switches.
- Port Aggregation Protocol (PAgP) – Cisco proprietary negotiation protocol
- Link Aggregation Control Protocol (LACP) – standard based alternative to PagP defined in IEEE 802.3ad
Configuring VLAN Access Control Lists (VACL)
Sep 27th
What is VLAN Access Control Lists (VACL) used for?
VLAN Access Control Lists (VACL) can be used to filter traffic within the same vlan
Scenario
Suppose a host is connected to VLAN 2 and we are required to drop all telnet traffic within VLAN 2.
Read more →
Configuring DHCP Snooping
Sep 9th
What is DHCP Snooping
DHCP snooping is a security feature inteneded to prevent rogue DHCP server from sending malicious DHCP replies.
When DHCP snooping is enabled, the switch intercept all the DHCP requests, and discards DHCP replies coming from “untrusted” ports. The offending switch ports are automatically shut down and put in errdisable state. Read more →
Cisco IOS Tips: Reload Command Explained
Aug 31st
I guess the reload command is self explanatory. It reboots the router.
Reload command can take two different kind of timer
- Execute at specific time or date (e.g at 11:00)
- Execute after certain number of minutes (e.g after 30mins)
Note : The router clock must be set before the reload command can work properly.
Read more →
Cisco IOS Tips: Display Interface The Smart Way
Aug 29th
Use the following command to dsplay brief summary of interfaces
Router#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.1.2 YES manual up up
FastEthernet0/1 192.168.10.2 YES manual up up
FastEthernet1/0 unassigned YES unset up down
FastEthernet1/1 unassigned YES unset up down
FastEthernet1/2 unassigned YES unset up down
FastEthernet1/3 unassigned YES unset up down
...
