15. Hello packets:
-
The types of
router protocols that use
"Hello" packets are EIGRP,
IS-IS, and OSPF.
16. Cisco IOS commands:
1.
Show IP protocol: This
command will show information on
RIP timers including routing
update timer (30sec default),
hold-down timer (default
180sec). It also displays the
number of seconds due for next
update (this is fraction of
update timer). This command also
gives the network number for
which IP RIP is enabled,
Gateway, and the default metric.
2.
Show IP route: This
command will display the IP
routing table entries. In
addition, it displays the
Gateway of last resort (if one
is assigned). It also displays
the codes used for various types
of routes. Some of the important
codes are:
C: directly connected;
S: Statically connected
I : IGRP
R : RIP
3.
show IP interface: This
command shows you
interface-wise information such
as IP address assigned to each
interface, whether the interface
is up, MTU etc.
4.
Debug IP RIP: Debug IP
RIP will turn the RIP debugging
ON. This will display a
continuous list of routing
updates as they are sent and
received. This leads to lot of
overhead, which is the reason
that you use "undebug ip rip" to
turn-off debugging as soon as
you finish with debugging.
5.
The command "no router
rip" is used for removing all
rip entries from the router.
6.
The command
i.
clear ip bgp *
clears all the entries from the
BGP routing table and reset BGP
sessions. This command is used
after every configuration change
to ensure that the change is
activated and that peer routers
are informed.
ii.
Another command,
clear ip bgp <address>
ex: clear ip bgp 172.31.0.0
removes the specified network
from the BGP table.
