MY CCIE JOURNEY

#SET TAG IE VOL 4.10#

SET TAG:

-> To set a tag value of the destination routing protocol ,
use the set tag command in route-map config mode


USAGE GUIDELINES:

-> Use the route-map global config mode , and the match and
set route-map config commands , to define the conditions
for redistributing routes from one routing protocol into
another .

-> Each route-map command has a list of match and set commands
associated with it . The match commands specify the match
value - the conditions under which redistribution is
allowed for the current route-map command

-> The set commands specify the set actions - the particular
redistribution actions to perform if the criteria enforced
by the match commands are met .

-> The set route-map config commands specify the redistribution
set actions to be performed when all the match criteria
of a route map are met . When all match criteria are met,
all set actions are performed

#IP DEFAULT-NETWORK IE VOL 1 1/3/2009 1:27 PM #

ip default-network:

-> To select a network as a candidate route for
computing the gateway of last resort , use the
"ip default-network" command in global config mode

USAGE GUIDELINES:

-> The cisco ios software uses both ad and metirc info to
determine the default route. multiple ip default-network
commands can be given.

-> All candidate default routes , both static (flagged by
ip default network command ) and dynamic , appear in the
routing table preceeded by asterisk

-> If the ip routing table indicates that the specified network
number is subnetted and a non zero subnet number is specified
,then the system will automatically config a static summ route

-> The static summary route is configured instead of a default
network . The effect of the static summary route is to
cause traffic destined for subnets that are not explicitly
listed in IP routing table to be routed using the
specified subnet

#DISTRIBUTE LIST 1/3/2009 1:34 PM#


distribute-list in:

-> To filter networks recieved in updates , use the "distribute-lists in"
commnad in appropriate config mode .


USAGE GUIDELINES:

-> This command must specify either an access list or a map-tag name of a route-map
The route-map is supported for OSPF and EIGRP

-> ospf routes cannot be filetered from entering the ospf db . if you use this
command for ospf, it only filters routes from the routing table , it does not
prevent link-state packets from being propogated




distribute-list out :

-> To suppress networks from being advertised in updates, use the "distribute-list out"
command in the appropriate configuration mode .

-> When networks are redistributed , a routing process name can be specified as an
optional trailing argument to the distribute-list command

-> Specifying this option causes the access list to be applied to only those
routes derived from the specified routing process

-> After the process-specific access list is applied, any access-list specified
by a distribute-list commnad without a process name argument will be applied

-> Addresses not specified in the distribute-list command will not be advertised
commnad will not be advertised in outgoing routing updates .

#DISTANCE EIGRP IE VOL 4.10 VOL 1 #

DISTANCE EIGRP

-> To allow the use of two administrative distances
internal and external that could be a better route
to the node , use the "distance eigrp" command in
router config mode

INTERNAL DISTANCE :

-> Administrative distance for EIGRP internal routes .
internal routes are those that are learned from
another entity with the same as .


-> The distance can be a value from 1 to 255 . the
default ad for EIGRP INTERNAL ROUTES is 90


EXTERNAL DISTANCE :

-> Administrative distance for EIGRP external routes.
external routes are those for which the best path
is learned from a neighbor external to the as .

-> The distance can be a value from 1 to 255. The
default ad for EIGRP external routes is 170

USAGE GUIDELINES :

-> An administrative distance is a rating of the trustworthiness
of a routing information source, such as an induvidual
router or a group of routers .

-> Numerically , an ad is an interger from 0 to 255 . In
general , the higher the value , the lower the trust
rating . An ad of 255 means the routing info source cannot
be trusted at all should be ignored


-> use the "distance eigrp" command if another protocol is
known to be able to provide a better route to a node than
was actually learned via external EIGRP . or if some
internal routes should really be preffered by EIGRP

configuration with and without leak map :

the topology is not represented but the idea is to advertise our route along with the default summary address

here are the routing table and topology table entries of my topology

note 155.0.5.0/24 is the network of interest

After the leak map application

r4#sir
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is 155.0.0.5 to network 0.0.0.0

155.0.0.0/24 is subnetted, 4 subnets
C 155.0.0.0 is directly connected, Serial0/0
D 155.0.5.0 [90/10639872] via 155.0.0.5, 00:07:49, Serial0/0--------------------------------->
C 155.0.4.0 is directly connected, Loopback0
C 155.0.45.0 is directly connected, Serial0/1
D* 0.0.0.0/0 [90/10639872] via 155.0.0.5, 00:26:00, Serial0/0
r4#show ip eigrp topo
IP-EIGRP Topology Table for AS(100)/ID(155.0.4.4)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status

P 0.0.0.0/0, 1 successors, FD is 10639872
via 155.0.0.5 (10639872/128256), Serial0/0
via 155.0.45.5 (40640000/128256), Serial0/1
P 155.0.0.0/24, 1 successors, FD is 10511872
via Connected, Serial0/0
P 155.0.5.0/24, 1 successors, FD is 10639872--------------------------->
via 155.0.0.5 (10639872/128256), Serial0/0
via 155.0.45.5 (40640000/128256), Serial0/1
P 155.0.4.0/24, 1 successors, FD is 128256
via Connected, Loopback0
P 155.0.45.0/24, 1 successors, FD is 40512000
via Connected, Serial0/1
r4#

#IP SUMMARY-ADDRESS EIGRP FRI JAN 2 2K9 #

TO CONFIGURE A SUMMARY AGGREGATE ADDRESS FOR A SPECIFIED
INTERFACE, USE THE "ip summary-address eigrp" command
in interface configuration mode .


"ip summary-address eigrp as-number ip-addr [admin][leakmap]"



USAGE GUIDELINES

The "ip summary-address eigrp" command is used to configure
interface level eigrp summaraisation.

EIGRP summary routes are given an administrative distance
value of 5. The administrative distance metric is used
to advertise a summary without installing it in the
routing table

By default, EIGRP summaries subnet routes to the network
level.The "no auto" command can be entered to configure
subnet level summaraisation

EIGRP SUPPORT FOR LEAKING ROUTES :

Configuring the leak-map keyword allows to advertise a
component route that would otherwise be suppressed by the
manual summary.

Any component subset of the summary can be leaked . A route
map and access list must be defined to source the leaked
route

The following is the default behaviour if an incomplete
cnfg is entered .

A) If the leak-map keyword is configured to reference a
non existant routemap, the configuration key word has no
effect. The summary address is advertised but all
component routes are suppressed

If the leak-map keyword is configured but the access-list
does not exist or the route map does not reference the
access list , the summary address and component routes
are sent .

going on to single technologies for the preciseness and also referring doc cd and making some kinda of notes . netmasterss igp is helping on the way .. any ways doing some of the ethreal videos and laura chappels tcp/ip video as to have some base level packet understanding .. it will take time though but worth spending .. i was advised to have some real good grip on tcp/ip packet understanding by my very good frnd talentpk ... anyways i had done a scenario on ie eigrp stub ..




#IE EIGRP STUB JAN 1 2K9#

EIGRP STUB:

To configure a router as a stub using EIGRP , use the
"eigrp stub" command in router config mode

"eigrp stub [recieve-only connected static summary redist]"

recieve only - sets the router as a recieve-only neigh

connected - advertises connected routes

static - advertise static route

summary - advertises summary routes

redistributed - advertises redistributed routes from other
and autonomous systems

USAGE GUIDELINES:

Use the "eigrp stub" command to configure as a stub where
the router directs all IP traffic to a distribution router

The "eigrp stub" command can be modified with serveral options
and these options can be used in any combination except
receive-only keyword

The receive-only keyword will restrict the router from sharing
any of its routes with any router in that EIGRP as, as the
receive-only keyword will not permit any other option to
be specified because it prevents any type of route from
being sent

The four other optional keywords (connected , static ,
summary, and redistributed) can be used in any combination
but cannot be used with the receive-only keyword)

The connected keyword permits the EIGRP stub routing feature
to send connected routes.if the connected routes are not
covered by a network command statement , it may be
necessary to redistribute connected routes with
redistribute connected command under EIGRP process . This
option is enabled by default

The "static" keyword permits the EIGRP stub routing feature
to send traffic to send static routes.without the configuration
of this option, EIGRP will not send any static routes,
including internal static routes that normally would be
automatically redistributed . it will still be necessary
to redistribute static routes with redistribute static command

The summary keyword permits the EIGRP stub routing feature
to send summary routes . summary routes can be created
manually with summary address command or automatically at a
major network border router with no auto command enabled

The redistributed keyword permits the EIGRP stub routing
feature to send other routing protocols and autonomous
systems .

Multiaccess interfaces , frame-relay are supported by the
EIGRP stub routing feature only when all routers on that,
interface, except the hub, are configured as stub routers.