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Cisco IOS

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February 28, 2018  3:26 AM

Cisco announces new version of CCIE SP Written and Lab Contents with version 4.1

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Access, CCIE, Cisco, Cisco IOS, Exam, Hardware, IOS, IPv4, IPv6, MPLS, QoS, router, Routing, service provider, Software, VPN

Recently Cisco updated the blueprint for the Cisco CCIE Service Provider Written & Lab exams, the new CCIE SP version 4.1 is only about 10% different than its preceding version 4.0. The exam format still remains the same, the CCIE SP written exam number also remains the same (400-201) and the...

January 27, 2016  6:00 AM

How to configure OSPF Totally Stubby Area in Cisco Routers- Series 2?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, Cisco IOS, Cisco Routers, IP Routing, Loopback, OSPF, OSPF protocol, Routing, Routing Table

In my previous post we studied the topology and saw how Type 3, Type 4 and Type  LSA routes are installed in non 0 Area. Now lets configure Area 5...


January 25, 2016  4:45 AM

What is OSPF Totally Stubby Area?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco IOS, Default route, IOS commands, OSPF, router

OSPF Totally Stubby Area basically filters out an information of a OSPF database purely based on the LSA types. An ABR  in a Totally Stubby Area  prevents LSA type 3, Type4 and Type 5  to be flooded in to a Totally Stub Area.  It replaces all these types of LSA with a default route. Basically...


January 24, 2016  5:33 AM

How to configure Stub Area in OSPF – Series 2?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, Cisco IOS, Dynamic Routing, IP routing protocols, Loopback, OSPF, OSPF protocol, Routing

In my previous post we studied the topology and saw how Type 5 LSA routes are installed in non 0 Area. Now lets configure Area 5 as a stub area. Its very easy to...


January 21, 2016  5:08 AM

What is an error “Number of interfaces…not consistent” in ASA Firewall?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, Cisco ASA, Cisco Firewall, Cisco IOS, IOS, Standby

If you are planning to do a hitless upgrade of a failover pair of ASA 5500 X Series firewall from 8.4(6) trail to 9.2(4) trail, you need to be little cautious. As you cannot do a direct upgrade, you need to rely on a interim release. Most people tend to try 9.1(2) as an interim upgrade, when you...


May 30, 2015  8:05 AM

How to Configure uRPF in Strict Mode?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco IOS, Cisco security, IP address, router, Topology

In this post lets configure uRPF in Strict mode, I have created the below topology using Cisco VIRL, a great tool to test many things. 0 Comments     RSS Feed     Email a friend


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