CCNP : Notes...
8.
RIP
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RIP (and IGRP) always summarizes routing information by major
network numbers. This is called classful routing.
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IP
RIP based networks send the complete routing table during update.
The default update interval is 30 seconds.
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RIP version 2 is a classless routing protocol, where as RIP version
1 (RIP 1) is a classful routing protocol. The disadvantage of
classfull routing is that some address space may be wasted. In
classless routing, routing protocols exchange the subnet mask
information during periodic routing updates. This allows variable
subnet masks to be used in the network, allowing better use of
address space. For example, a WAN link may need only two IP
addresses. If you use classless routing protocol with, say 6 bits
for subnetting (62-2 subnets), only 2 subnet addresses are utilized
and the remaining become wasted. On the other hand, if you use
classless routing protocol, Variable Length Subnet Mask (VLSM) can
be used within the network, giving only 2 valid addresses for the
WAN link, thus saving valuable address space. (If you are using IP
addresses, address space involves IP addresses).
9.
Metric limit for link-state protocols is 65,533.
10. Convergence is the term used to describe the state at which all
the internetworking devices, running specific routing
protocol, are having the same information about the internetwork in
their routing tables. The time it takes to arrive at common view of
the internetwork is called Convergence Time.
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