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10 ISIS Details You Must Know!
By Chris Bryant
Expert Author
Article Date: 2006-05-11
Earning your CCNP certification and passing the BSCI exam depends on knowing the details of many Cisco technologies, ISIS chief among them.
To help you prepare for exam success, here´s a list of ISIS terminology and basic concepts that will help you pass this tough exam. Enjoy!
ISIS Terms:
Domain: section of the network under common administrative control
Area: logical segment of the network composed of contiguous routers and their data links
Intermediate System: A router.
End System: A host device.
The four levels of ISIS routing:
Level 0: ES-IS routing in the same subnet.
Level 1: IS-IS routing in the same area.
Level 2: IS-IS routing in the same domain.
Level 3: Inter-domain routing performed by InterDomain Routing Protocol (IDRP).
ISIS Adjacency Possibilities:
L1: Can form adjacency with any L1 in the same area and any L1/L2 in the same area.
L2: Can form adjacency with any L2 in any area, and with an L1/L2 in any area.
L1/L2: Can form adjacency with any L1 in the same area, L1/L2 in any area, and L2 in any area.
A router interface's SNPA (Subnetwork Point Of Attachment) is its highest DLCI number if it's on a Frame network, and its MAC address if the interface is on an Ethernet segment.
ISIS Hello Types:
ESH: ES Hello - Sent by End Systems to discover a router.
ISH: IS Hello - Send by Intermediate Systems to announce their presence. End Systems listen for these.
IIH: IS-to-IS Hello - Send by one IS to be heard by another IS. These hellos makes IS-IS adjacencies possible.
Best of luck on your CCNP exams!
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About the Author:
Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of FREE CCNA and CCNP tutorials and daily exam questions, as well as The Ultimate CCNA and CCNP Study Packages.
For a FREE copy of his latest e-books, "How To Pass The CCNA" or "How To Pass The CCNP", and for free daily exam question, visit the website and download your copies!
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