LSA Types 1 and 2

Each router creates and floods a type 1 LSA for itself. These LSAs describe the router, its interfaces (in that area), and a list of neighboring routers (in that area) on each interface. The LSA itself is identified by a link-state ID (LSID) equal to that router

OSPF Media Types

OSPF runs on several media types. On some media, such as multiaccess and point-to-point media, the OSPF default network type is used. Therefore, there is no need to configure any network type on those media. This section goes into detail on each medium type in OSPF and what network type to use f...

Telephone System

How is the telephone system similar to the postal and highway systems? The answer to this question can be found by reviewing the properties of the first two systems we examined to see if similarities with the phone system exist. The first property the postal and highway systems have in common is a r...


This pair of router configurations shows how to define a tunnel connecting two serial ports supporting Bisync (BSC or Binary Synchronous Communications) devices: BSTUN-A#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. BSTUN-A(config)#interface Loopback0 BS...


EIGRP uses a concept of a representing each router with a router ID (RID). The EIGRP RID is a 32-bit number, represented in dotted decimal. Each router determines its RID when the EIGRP process starts, using the same general rules as does OSPF for determining the OSPF RID, as follows: Step 1. Us...

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