Network technologies and trends:

Cisco IOS


November 19, 2011  6:22 AM

What is Cisco Embedded Event Manager?



Posted by: Yasir Irfan
Cisco Device, Cisco IOS, data collection, EEM, Event Detectors, event management, in IOS 12.4(22)T, IOS-XE, IOS-XR, NX-OS, Policies, proactive actions, Programming languages, scripting, thresholding, What is Cisco Embedded Event Manager?

Cisco Embedded Event Manager better known as EEM is a powerful feature included in Cisco IOS such as IOS-XR, IOS-XE and NX-OS. The Cisco EEM in simple terms is a technology developed by Cisco systems which allows you to run a script or a set of command upon an event. The Cisco EEM allows the...

July 31, 2011  9:54 AM

Key differences between a Nexus 7010 and 7018 Switches – Series 4



Posted by: Yasir Irfan
1.2 Tb/s system bandwidth, 480 mpps system switching, 7018, 80 Gb/s and 60 mpps per slot, BTUs, Cisco IOS, Cisco Systems, cold aisle/hot aisle data center, Data Center, differences between a Nexus 7010 and 7018 Switches, Fabric Card, fault tolerant, hot-swappable power supplies, key features of NX-OS, Linux, Linux based operating system, N7K-AC-6.0KW, N7k-AC-7.5KW, N7K-C7010-FAB-1, N7K-C7010-FAN, N7k-C7018-FAB-1, N7K-C7018-FAN, N7K-DC-6.0KW, Nexus 7000 Series Switches, Nexus 7010, Nexus 7010 cooling, Nexus 7010 fan module, Nexus 7010 Switch Fabric module, Nexus 7018 cooling, Nexus 7018 fan module, Nexus 7018 Switch airflow, Nexus 7018 Switch dissipates, Nexus 7018 Switch fabric module, Nexus Switches, NX-OS, Panduit, Panduit Net-Access 7018 Cabinets, physical difference about Nexus 7010 and 7018 Switches, power supplies, SAN-OS, side to side airflow, special rack, sup1, Supervisor Engines, three load sharing

One more difference I came across among Nexus 7010 and Nexus 7018 Switch is the power supplies, the Nexus 7010 Switch can hold up to three load sharing, fault tolerant , hot-swappable power supplies.  Whereas the Nexus 7018 switch can hold up to four load sharing, fault tolerant, hot-swappable...


July 31, 2011  8:09 AM

Key differences between a Nexus 7010 and 7018 Switches – Series 3



Posted by: Yasir Irfan
1.2 Tb/s system bandwidth, 480 mpps system switching, 7018, 80 Gb/s and 60 mpps per slot, BTUs, Cisco IOS, Cisco Systems, cold aisle/hot aisle data center, Data Center, differences between a Nexus 7010 and 7018 Switches, Fabric Card, key features of NX-OS, Linux, Linux based operating system, N7K-C7010-FAB-1, N7K-C7010-FAN, N7k-C7018-FAB-1, N7K-C7018-FAN, Nexus 7000 Series Switches, Nexus 7010, Nexus 7010 cooling, Nexus 7010 fan module, Nexus 7010 Switch Fabric module, Nexus 7018 cooling, Nexus 7018 fan module, Nexus 7018 Switch airflow, Nexus 7018 Switch dissipates, Nexus 7018 Switch fabric module, Nexus Switches, NX-OS, Panduit, Panduit Net-Access 7018 Cabinets, physical difference about Nexus 7010 and 7018 Switches, SAN-OS, side to side airflow, special rack, sup1, Supervisor Engines

The other difference I have noticed between a Nexus 7010 and Nexus 7018 Switches is the way the cooling works. The Nexus 7010 and Nexus 7018 Switches are cooled using the fan trays which are found at the back of Nexus 7000 Series chassis. The Nexus 7018 Switch applies side to side airflow , the...


July 31, 2011  5:27 AM

Key differences between a Nexus 7010 and 7018 Switches – Series 2



Posted by: Yasir Irfan
1.2 Tb/s system bandwidth, 480 mpps system switching, 7018, 80 Gb/s and 60 mpps per slot, Cisco IOS, Cisco Systems, Data Center, differences between a Nexus 7010 and 7018 Switches, Fabric Card, key features of NX-OS, Linux, Linux based operating system, N7K-C7010-FAB-1, N7k-C7018-FAB-1, Nexus 7000 Series Switches, Nexus 7010, Nexus 7010 Switch Fabric module, Nexus 7018 Switch fabric module, Nexus Switches, NX-OS, Panduit Net-Access 7018 Cabinets, physical difference about Nexus 7010 and 7018 Switches, SAN-OS, sup1, Supervisor Engines

In my previous post I mentioned about the physical difference about Nexus 7010 and 7018 Switches, apart from physical differences there are some other...


July 30, 2011  6:31 AM

Key differences between a Nexus 7010 and 7018 Switches – Series 1



Posted by: Yasir Irfan
7018, Cisco IOS, Cisco Systems, Data Center, differences between a Nexus 7010 and 7018 Switches, key features of NX-OS, Linux, Linux based operating system, Nexus 7000 Series Switches, Nexus 7010, Nexus Switches, NX-OS, Panduit Net-Access 7018 Cabinets, SAN-OS

We all know the introduction of Nexus 7000 Series brought the revolution to Data Centers; Nexus 7000 Series Switches are quite different from the traditional Cisco Catalyst 6500 Series Switches.  Nexus 7000 Switches comes in two...


May 28, 2011  5:12 AM

Cisco Catalyst 6500 Series Switches supports next-generation medianet, Cisco EnergyWise, TrustSec, and Borderless Mobility.



Posted by: Yasir Irfan
12.2(33)SXI4, A-VPLS, Advanced Virtual Private LAN Services, Borderless Mobility, Cisco Catalyst 6500 Series Switches, Cisco Catalyst Switches, Cisco EnergyWise, Cisco IOS, Cisco IOS Software Release 12.2(33)SXI4, Cisco News, Cisco Tips, Data Center Interconnect, medianet, MSR, Multicast Service Reflection, Network technologies & trends, SAF, Service Advertisement Framework, TrustSec, VSS Quad-Sup

The newly released Cisco IOS Software Release 12.2(33) SXI4 brings groundbreaking Borderless Networks innovations to Cisco Catalyst 6500 Series Switches. With more than 50...


April 30, 2011  6:45 AM

Resequence the access-list!



Posted by: Yasir Irfan
ACL, Cisco Access list, Cisco IOS, Cisco IOS device, Cisco Router, Cisco Switches, Cisco tip, extended ip access-list, ip access-list resequence, Network technologies & trends, Network Technologies and tips., Resequence the access-list

When it comes to modifying Access lists in Cisco IOS devices most of us remove the ACL's from the Cisco Router and then edit the entries in a note, and then paste back the modified ACL to the respective router via CLI. There is a way to reduce the overhead involved in modifying ACL by using the...


March 27, 2011  5:46 AM

What is IP SLA?



Posted by: Yasir Irfan
CCNP, CCNP 642-813 Exam, CCNP Switch Official Certification Guide, Cisco CCNP- Switch Exam, Cisco IOS, Cisco IOS devices, Cisco IOS IP Service Level Agreement, Cisco Routers, Cisco Switches, Cisco Systems, David Hucaby, DNS, http.ftp, IBM SNA Native Echo, ICMP Echo Path, ICMP Ping, icmp-echo, IOS version 11.2, Network technologies & trends, patch-echo, path-jitter, Performance Routing, Response Time Responder (RTR), Service Assurance Agent (SAA), Switching, tcp-connect, udp-echo, udp-jitter, · What is IP SLA?

 When you are preparing for Cisco CCNP- Switch Exam, IP SLA is one of the key topics included at quite later stage even surprised David Hucaby the author of the title "CCNP Switch Official Certification Guide"  Even he included the supplementary material for the "CCNP Switch Official...


January 5, 2011  6:05 AM

What happened to “write memory” IOS command in Cisco Nexus 7000 Series Switch?



Posted by: Yasir Irfan
Cisco Command, Cisco IOS, Cisco IOS command, Cisco IOS Commands, Cisco Nexus 7000 Series switch, Cisco Switch tips, configuring Cisco Nexus 7000 Switch, copy running-configuration startup-configuration, difference between IOS and NX-OS, IOS, IOS command, Network technologies & trends, Nexus configuration, What happened to “write memory” IOS command in Cisco Nexus 7000 Series Switch?, wri mem, write memory

When configuring Cisco Catalyst Switches, I quite often use "write memory" command to save my configuration rather than using "copy running-configuration startup-configuration" Cisco IOS command. Other day I was saving my running configuration to the startup configuration in a Cisco Nexus 7000...


July 27, 2010  8:31 AM

Using TCL scripts to test connectivity of hosts in a Cisco device



Posted by: Yasir Irfan
Cisco Catalyst 6506 E, Cisco IOS, Cisco IOS 12.3(2) T, Cisco Press, Cisco Routers, Cisco Scripts, Cisco Switches, foreach VAR {, How to enable tcl in a Cisco Router or a Cisco Switch, Linux, Network Monitoring, Network Technologies and Trends, Network Tools, networking activities, programming language, scripting language, TCL, TCL Script for Cisco IOS, tclq, tclsh, Tool Command Language, UNIX, Using TCL scripts, Windows

In my


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