Advanced Routing Suite-Configuring BGP and OSPF

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Advanced Routing SuiteConfiguring BGP and OSPF Interoperability

June 4, 2009


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Copyright 2009 Check Point Software Technologies, Ltd. All rights reserved 2

In This Document

IntroductionTo preserve existing technologies and enable the addition of new ones into constantly changing

computer networks, multiple dynamic routing protocols should be able to work side by side. This

document covers how configure, activate and monitor BGP and OSPF to share routing information

on the same network.

Basic Terminology

Route Redistribution

A configuration option local to a router that enables different routing protocols to exchange

routing information.

ASBR and External Routes

An Autonomous System Boundary Routerimports routing information learned from other routing

protocols into the OSPF routing domain. New routes learned through this mechanism are

known as External Routes.

OSPF External Routes

OSPF distinguishes between internal and external routes. In OSPF, external routes are further

distinguished as either Type-1 or Type-2. The difference between them refers to the way in

which the route metric accumulates over the network.

Type-1 external route means that the metric is the sum of the internal OSPF cost and the

external redistributed cost.

Type-2 (the default external type) external route means that the metric is equal only to the

redistributed cost.

Introduction page 2

A Simple Routing Topology page 4

Configuring Multiple Dynamic Routing Protocols page 4

References page 7

Documentation Feedback page 7


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Introduction

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Basic Commands

router ospf

Enters the local router OSPF sub-menu, enables configuration and modification of OSPF

settings on the local peer. Multiple instances of OSPF may run on the same router.

network area Defines which interfaces run and listen to OSPF. Directly connected networks that match the

address and wildcard-bits will be assigned with the area id. Due to the OSPF broadcast

auto-detection mechanism, all routers on the same subnet running OSPF with the same area

identifier are automatically considered OSPF neighbors.

router-id

Statically defines the ID the router will use on the OSPF network.

show ip ospf

Displays OSPF routing information of a specific OSPF instance.

show ip ospf neighbor

Displays OSPF neighbors information.

show ip route ospf

Displays routes from local routing table that were learned through the OSPF protocol.

router bgp

Enters the local router BGP sub-menu and enables BGP on the local peer. The specified

autonomous system determines the local routers BGP AS. A router can only be associated with

a single AS.

neighbor remote-as

Activates BGP with this neighbor, configures the IPv4 address of the host machine and the

remote-AS number for this host.

network mask

Defines which network will be advertised through BGP updates to neighbors. The command

does not activate the protocol on the interface.

show ip bgp neighbors

Displays BGP neighbor information.

show ip bgp summary

Displays BGP summary information.

show ip route bgp

Displays routes from the local routing table that were learned through the BGP protocol.

Redistribute

A command which defines which protocols will be injected into a specific dynamic routing

protocol.


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A Simple Routing Topology

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A Simple Routing TopologyConsider the routing topology shown in Figure 1:

Figure 1 Basic Topology for Multiple Dynamic Routing Protocols

In Figure 1, routers:

A and C run OSPF

A and B run BGP

The OSPF routers (A and C) work in area 0 (backbone area) and act as neighbors.The BGP routers

(A and B) maintain a neighborhood relation (meaning they are BGP neighbors).

Configuring Multiple Dynamic Routing ProtocolsAdvanced Routing is only supported on SecurePlatform Pro. Before configuring dynamic routing

protocols verify that the Advanced Routing Suite is enabled. If the suite is not enabled, enable it

using the cpconfig option Enable Advanced Routing. To enter the Advanced Routing Suite CLI,enter router on the SecurePlaform command line.


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Configuring Multiple Dynamic Routing Protocols

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To enable the configuration shown in Figure 1:

1. Router A is configured to run OSPF process 1. Activate the OSPF process on the interface that

is directly connected to network 172.16.1.0/24:

Router A is running a BGP instance (AS 65165) and defines Router B as BGP neighbor

through network 10.0.1.0/24:

2. Configure Router A to advertise the 10.0.1.0/24 network through the BGP protocol:

Router B is also running a BGP instance (AS 65165) and defines Router A as BGP neighbor

through network 10.0.1.0/24:

3. Configure Router B to advertise networks 10.0.1.0/24 and 192.168.1.0/24 through the BGP

protocol:

4. Configure Router C to activate the OSPF process 1 on the interface that is directly connected

to networks 172.16.1.0/24 and 192.168.2.0/24:

Router A runs two types of dynamic routing protocols (OSPF and BGP).

5. Distribute routes learned from OSPF to BGP:

localhost.localdomain#configure terminal

localhost.localdomain(config)#router ospf 1

localhost.localdomain(config-router-ospf)#network 172.16.1.0

0.0.0.255 area 0.0.0.0localhost.localdomain(config-router-ospf)#end


localhost.localdomain(config)#router bgp 65165

localhost.localdomain(config-router-bgp)#neighbor 10.0.1.20remote-as 65165

localhost.localdomain(config-router-bgp)#end

localhost.localdomain#configure terminallocalhost.localdomain(config)#router bgp 65165

localhost.localdomain(config-router-bgp)#network 10.0.1.0 mask255.255.255.0




localhost.localdomain(config-router-bgp)#neighbor 10.0.1.10remote-as 65165









localhost.localdomain(config-router-ospf)#network 192.168.2.00.0.0.255 area 0.0.0.0

localhost.localdomain(config-router-ospf)#network 172.16.1.00.0.0.255 area 0.0.0.0

localhost.localdomain(config-router-ospf)#end


localhost.localdomain(config)#router bgp 65165localhost.localdomain(config-router-ospf)#redistribute ospf



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Configuring Multiple Dynamic Routing Protocols

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6. Do the same for BGP so that routes learned from BGP will be distributed to OSPF:

7. Use the show command to verify the existence of OSPF information on Router C:



localhost.localdomain(config-router-ospf)#redistribute bgp


localhost.localdomain#show ip ospf 1

Routing Process "ospf 1" with ID 172.16.1.20

Supports opaque LSA

It is an autonomous system boundary router and is not an areaborder router

Hold time between two SPFs is 5

Minimum LSA interval 5. Minimum LSA arrival 1

Number of external LSA 2.

Checksum sum 1802683

Number of opaque AS LSA 0,

Checksum sum 0

Number of areas in this router is 1.

1 normal

0 stub

0 nssa

Area 0.0.0.0

Number of interface in this area is 2

It is a normal area

Number of LSA 4

Checksum sum 1802683

Number of opaque LSA 0

Checksum sum 0

Area ranges are

localhost.localdomain#show ip route ospf

Codes: C - connected, S - static, R - RIP, B - BGP, O - OSPF

D - DVMRP, 3 - OSPF3, I - IS-IS, K - Kernel

A - Aggregate

O 192.168.1.0/24 [10/150] via 192.168.7.2, 07:22:49, eth1

O 192.168.2.0/24 [10/150] via 192.168.7.2, 11:23:08, eth2


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References

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ReferencesFor more configuration information see:

Check Point SecurePlatformPro and Advanced Routing Suite CLI Guide

Advanced Routing Suite - Configuring BGP

Advanced Routing Suite - Configuring OSPF

Advanced Routing Suite - Dynamic Routing in a ClusterXL Environment

Advanced Routing Suite - Configuring PIM

Available at:

http://support.checkpoint.com

Documentation FeedbackCheck Point is engaged in a continuous effort to improve its documentation. Please help us by

sending your comments to:

[email protected]
http://support.checkpoint.com/mailto:[email protected]?subject=Check%20Point%20User%20Guide%20feedbackmailto:[email protected]?subject=Check%20Point%20User%20Guide%20feedbackhttp://support.checkpoint.com/

Advanced Routing Suite-Configuring BGP and OSPF

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