Tag: OSPF

OSPF Cheat Sheet – Part1

OSPF Cheat Sheet - Part1

      OSPF (Open Shortest Path First) Cheat Sheet – Best of CCNA, CCNP, CCIE, Huawei HCNA/E, Juniper JNCIA/P, Nokia NRS1/2,…. Download all Cheatsheets: https://aurumme.com/atech/atech-summary-cheatsheets-ccna/ All Online Quiz: https://aurumme.com/atech/free-online-quiz-interview-questions-atech/ Join our Facebook Group & Page to stay updated with content: https://www.facebook.com/ATechIT1/, https://www.facebook.com/groups/ATechIT/ Stay updated with our YouTube Channel for relevant video: https://www.youtube.com/atechit/  

OSPF Multi-vendor Configuration Cheat Sheet

OSPF Multi-vendor Configuration Cheat Sheet

      OSPF Multi-vendor Configuration Cheat Sheet – Best of CCNA, CCNP, CCIE, Huawei HCNA/E, Juniper JNCIA/P, Nokia NRS1/2,…. Download all Cheatsheets: https://aurumme.com/atech/atech-summary-cheatsheets-ccna/ All Online Quiz: https://aurumme.com/atech/free-online-quiz-interview-questions-atech/ Join our Facebook Group & Page to stay updated with content: https://www.facebook.com/ATechIT1/, https://www.facebook.com/groups/ATechIT/ Stay updated with our YouTube Channel for relevant video: https://www.youtube.com/atechit/  

OSPF Virtual Links

Virtual Link is a non-Physical connectivity or link. As we know OPSF must be connected with Backbone Area0 but sometime it becomes difficult due to some reasons. So there we required Virtual Links for logical connection to Backbone. Also known as logical link which uses in least cost path connectivity between routers or ABR or backbone/Non-backbone. A virtual link does not have ABR physical Connectivity to Backbone till to configure virtual link between non-backbone area and Backbone. In between two routers, a virtual link can be configured, that have an interface to a single common Transit/Non-backbone area but it can’t Read More …

OSPF Authentication

What is Authentication: Authentication is the mechanism of recognizing the identity of a user. Associating an incoming request with a set of identifying credentials is called Authentication.    The credentials provided are compared to those in the database of the authorized user’s information register on a local operating system or somewhere remote. If the user is on white-list then he/she is allowed the access, otherwise the access is rejected simply.     Types of OSPF Authentication OSPF supports two types of authentication i.e. Plain Text authentication and Message Digest 5 (MD5) authentication. As a message/packet required authentication for both destinations.   Read More …

OSPF Type5 Message / LSAck Packet (Link State Acknowledgment)

Finally, Acknowledgements are needed once the LSR/LSU (request/reply) process is complete. Type5 OSPF Packets are used for this purpose which are called LSAck (Link State Acknowledgment). Consider the simple below topology with two Routers: After LSU’s, LSAck’s are sent as a confirmation message. It is obvious from the below detail, spend some time with it to understand it fully: