IS-IS NBMA Solutions in Switched WAN Networks
Integrated IS-IS recognizes three different types of WAN connections: point-to-point leased lines, dialup links, and switched WANs.
Point-to-Point WANs
This first category of WAN connection is usually a leased line solution between two ISs that exist on both sides of a HDLC or PPP circuit. In other words, IS-IS considers this an NBMA network with just two attached devices. A solitary IIH PDU is used to designate a Level 1, Level 2, or L1L2 adjacency on a point-to-point link. After adjacency is defined, the peers transmit CSNP (complete) packets detailing the contents of their link-state databases. PSNPs are then used to request missing LSPs and for acknowledgement as displayed earlier in Figure 6.4 ...
Get BSCI Exam Cram™ 2 (Exam 642-801) now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
