... shows the structure of the IS-IS common header, which starts every IS-IS
message. The 8-bit PDU type field indicates the type of message that is carried inside the
IS-IS message. On the right of the ... 107
1921.6820.4003.02-00
System-ID
Pseudonod
e-
ID
Fragment-
ID
F
IGURE 4.24. The LSP-ID uniquely identifies an IS-IS router announcement – the first 6 bytes
represent...
... a good start for the self-education of both the
novice and the seasoned network engineer in the IS-IS routing protocol. The consistent
approach is to explain the theory and then show how things ... an IP header. The packet then leaves the End System and is either sent directly
to the receiving end system (if it is on the same network) or passed to the default
router....