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admin — Fri, 20 Sep 2013 08:39:25 +0000

Cisco CCNP / BSCI Exam Tutorial: Using Distribute Lists

To be successful on the BSCI exam and in earning your CCNP,pearl white slimming capsule review philippines, you’ve got to master route redistribution. This isn’t as easy as it sounds, because configuring route redistribution is only half the battle. Whether it’s on an exam or in a real-world production network, you’ve got to identify possible points of trouble before you configure route redistribution – and you need to be able to control redistribution as well. You may have an OSPF domain with 100 routes, but only need to redistribute 10 of them into a neighboring RIPv2 domain. You’ve got to know how to do that, and one method is the use of a distribute-list.

A distribute-list is an access-list that is used to determine what routes can and cannot be redistributed. Distribute-lists let you specify what routes will be filtered from the process. You can use standard or extended ACLs, and you can filter routes that are ing into a routing process or being injected into another process.

In the following example, R1 is redistributing RIP routes into OSPF, but only wants to advertise network 150.1.1.0 /24 to other OSPF routers. An ACL will be written to match that particular network,pearl white slimming capsule review philippines, and then the distribute-list will be written under the routing process. I’m going to show you the IOS Help output for the distribute-list mand, and please note that routing updates can be controlled at the interface level or protocol level.

R1(config)#access-list 24 permit 150.1.1.0 0.0.0.255

R1(config)#router ospf 1

R1(config-router)#redistribute rip subnets

R1(config-router)#distribute-list 24 ,pearl white slimming capsule review philippines?

in Filter ining routing updates

out Filter outgoing routing updates

R1(config-router)#distribute-list 11 out ?

Async Async interface

BRI ISDN Basic Rate Interface

BVI Bridge-Group Virtual Interface

CTunnel CTunnel interface

Dialer Dialer interface

Ethernet IEEE 802.3

Lex Lex interface

Loopback Loopback interface

Multilink Multilink-group interface

Null Null interface

Serial Serial

Tunnel Tunnel interface

Vif PGM Multicast Host interface

Virtual-Template Virtual Template interface

Virtual-TokenRing Virtual TokenRing

bgp Border Gateway Protocol (BGP)

connected Connected

egp Exterior Gateway Protocol (EGP)

eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)

igrp Interior Gateway Routing Protocol (IGRP)

ospf Open Shortest Path First (OSPF)

rip Routing Information Protocol (RIP)

static Static routes

R1(config-router)#distribute-list 11 out rip

Using distribute-lists does guard against routing loops,pearl white slimming capsule review philippines, but they have other purposes. You may have a network segment that should be kept secret from the rest of your pany; a distribute-list can filter that segment’s network number from the redistribution process. In this way,pearl white slimming capsule review philippines, distribute-lists serve as a basic form of network security. (Very basic. I wouldn’t sell that firewall on ebay if I were you.)

Keeping such networks out of routing updates and routing tables throughout the network has the side effect of reducing routing update overhead as well.

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