Cisco CCIP MPLS Study Guide phần 10 pps

Service Provider Network Configuration with OSPF 411interface Serial0 description *** Link to Atlanta POP *** ip address 192.168.3.5 255.255.255.252 no fair-queue !interface Serial1 n

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Service Provider Network Configuration with OSPF 411

interface Serial0 description *** Link to Atlanta POP ***

ip address 192.168.3.5 255.255.255.252

no fair-queue

!interface Serial1

no ip address shutdown

!router bgp 65001

no synchronization bgp log-neighbor-changes redistribute connected neighbor 192.168.3.6 remote-as 65000

ip netmask-format decimalline aux 0

line vty 0 4 privilege level 15 password cisco logging synchronous login

ip netmask-format decimal

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412 Appendix B Service Provider Tag Switching with OSPF and IS-IS

Atlanta POP Router Configuration

On the Atlanta POP router, standard OPSF is configured as the IGP I-BGP

is set up between the Atlanta and Raleigh POP routers An E-BGP session is set up between the Atlanta POP router and Peer 1 Tag switching is enabled only on the internal service provider link

Atlanta#show running-config

Building configuration

Current configuration : 1572 bytes

!version 12.1service timestamps debug uptimeservice timestamps log uptime

no service password-encryption

!hostname Atlanta

!enable password cisco

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interface Loopback0

ip address 204.134.83.1 255.255.255.255

!interface Serial0/0 description *** Link to Core Router ***

ip address 204.134.83.5 255.255.255.252 tag-switching ip

no fair-queue clockrate 64000

!interface Serial0/1 description *** Link to Peer1 ***

ip address 192.168.3.6 255.255.255.252 clockrate 64000

!interface Serial0/2

no ip address shutdown clockrate 64000

!interface Ethernet1/0

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interface Ethernet1/3

!router ospf 1 log-adjacency-changes network 204.134.83.1 0.0.0.0 area 0 network 204.134.83.5 0.0.0.0 area 0

!router bgp 65000

no synchronization bgp log-neighbor-changes neighbor 192.168.3.5 remote-as 65001 neighbor 204.134.83.3 remote-as 65000 neighbor 204.134.83.3 update-source Loopback0 neighbor 204.134.83.3 next-hop-self

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Core Router Configuration

On the Core router, standard OPSF is configured as the IGP Tag switching

is enabled on the two service provider links

Core#show running-config

!hostname Core

ip address 204.134.83.2 255.255.255.255

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interface Serial0/0 description *** Connection to Raleigh POP ***

no fair-queue

!interface Serial0/1 description *** Connection to Atlanta POP ***

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router ospf 1 log-adjacency-changes network 204.134.83.2 0.0.0.0 area 0 network 204.134.83.6 0.0.0.0 area 0 network 204.134.83.9 0.0.0.0 area 0

!end

Raleigh POP Router Configuration

On the Raleigh POP router, standard OPSF is configured as the IGP I-BGP

is set up between the Raleigh and Atlanta POP routers An E-BGP session is set up between the Raleigh POP and Peer2 Tag switching is enabled only on the internal service provider link

Raleigh#show running-config

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!hostname Raleigh

ip address 204.134.83.3 255.255.255.255

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interface Serial0/1 description *** Link to Peer2 ***

clockrate 64000

!router ospf 1 log-adjacency-changes network 204.134.83.3 0.0.0.0 area 0 network 204.134.83.10 0.0.0.0 area 0

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router bgp 65000

!end

Peer 2 Router Configuration

On the Peer 2 router, MPLS is not enabled; only standard BGP is enabled

Peer2#show running-config

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!hostname Peer2

ip address 192.168.2.1 255.255.255.255

!interface Ethernet0

!interface Serial0 description *** Link to Raleigh POP ***

ip address 192.168.3.10 255.255.255.252

no fair-queue

!interface Serial1

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router bgp 65002

!end

Routing Tables

This section shows you the routing tables of each network device in the example network Notice that the Core router has no knowledge of the peer router subnets and the peer routers have no knowledge of the core service provider networks The Atlanta and Raleigh POP routers have full knowl-edge of all the subnets in the network

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Peer 1 Routing Table

On the Peer 1 router, internal service provider routes do not show up in the routing table:

Peer1#show ip route

Output Omitted

Gateway of last resort is not set

192.168.1.0 255.255.255.255 is subnetted, 1 subnets

C 192.168.1.1 is directly connected, Loopback0 192.168.2.0 255.255.255.255 is subnetted, 1 subnets

B 192.168.2.1 [20/0] via 192.168.3.6, 00:08:15 192.168.3.0 255.255.255.252 is subnetted, 2 subnets

B 192.168.3.8 [20/0] via 192.168.3.6, 00:08:15

C 192.168.3.4 is directly connected, Serial0

Atlanta Routing Table

On the Atlanta POP router, all routes (both peer and service provider) are displayed in the routing table:

Atlanta#show ip route

Output Omitted

204.134.83.0 255.255.255.0 is variably subnetted, 5 subnets, 2 masks

O 204.134.83.8 255.255.255.252 [110/1562] via 204.134.83.6, 00:10:08, Serial0/0

C 204.134.83.1 255.255.255.255 is directly connected, Loopback0

O 204.134.83.3 255.255.255.255 [110/1563] via 204.134.83.6, 00:10:08, Serial0/0Simpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com

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O 204.134.83.2 255.255.255.255 [110/782] via 204.134.83.6, 00:10:08, Serial0/0

C 204.134.83.4 255.255.255.252 is directly connected, Serial0/0

192.168.1.0 255.255.255.255 is subnetted, 1 subnets

B 192.168.3.8 [200/0] via 204.134.83.3, 00:09:24

C 192.168.3.4 is directly connected, Serial0/1

Core Routing Table

On the Core router, only internal service provider routes show up in the routing table:

Core#show ip route

Output Omitted

204.134.83.0 255.255.255.0 is variably subnetted, 5 subnets, 2 masks

O 204.134.83.1 255.255.255.255 [110/782] via 204.134.83.5, 00:10:51, Serial0/1

O 204.134.83.3 255.255.255.255 [110/782] via 204.134.83.10, 00:10:51, Serial0/0

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Raleigh Routing Table

On the Raleigh POP router, both service provider and peer routers are displayed in the routing table:

Raleigh#show ip route

Output Omitted

204.134.83.0 255.255.255.0 is variably subnetted,

5 subnets, 2 masks

O 204.134.83.1 255.255.255.255 [110/1563] via 204.134.83.9, 00:11:17, Serial0/3

O 204.134.83.2 255.255.255.255 [110/782] via 204.134.83.9, 00:11:17, Serial0/3

O 204.134.83.4 255.255.255.252 [110/1562] via 204.134.83.9, 00:11:17, Serial0/3 192.168.1.0 255.255.255.255 is subnetted, 1 subnets

C 192.168.3.8 is directly connected, Serial0/1

B 192.168.3.4 [200/0] via 204.134.83.1, 00:10:34

Peer 2 Routing Table

On the Peer 2 router, no service provider routes are displayed in the routing table:

Peer2#show ip route

Output Omitted

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Gateway of last resort is not set 192.168.1.0 255.255.255.255 is subnetted, 1 subnets

C 192.168.2.1 is directly connected, Loopback0 192.168.3.0 255.255.255.252 is subnetted, 2 subnets

C 192.168.3.8 is directly connected, Serial0

B 192.168.3.4 [20/0] via 192.168.3.9, 00:11:45

Tags

In this section, the mapping of tags to IP prefixes shows that a complete LSP exists between the loopback addresses on the Atlanta and Raleigh POP routers With an end-to-end LSP, the Core router only needs to examine the label, and therefore does not require full knowledge of the peer subnets

Atlanta POP Forwarding Table

In the following output from the Atlanta POP router, you can see that a full LSP exists between the Atlanta and Raleigh POP routers:

Atlanta#show tag-switching forwarding-table

Local Outgoing Prefix Bytes tag Outgoing Next Hoptag tag or VC or Tunnel Id switched interface

26 Pop tag 204.134.83.2 255.255.255.255 0 Se0/0 point2point

27 26 204.134.83.3 255.255.255.255 0 Se0/0 point2point

Core Forwarding Table

On the Core router, labeled packets between the Atlanta and Raleigh POP routers will be label-switched, as indicated in the forwarding table:

Core#show tag-switching forwarding-table

Local Outgoing Prefix Bytes tag Outgoing Next Hop

tag tag or VC or Tunnel Id switched interface

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Service Provider Network Configuration with IS-IS 427

Raleigh POP Forwarding Table

In the following output from the Raleigh POP router’s forwarding table, you can see that a full LSP exists between the Raleigh and Atlanta POP routers:

Raleigh#show tag-switching forwarding-table

Local Outgoing Prefix Bytes tag Outgoing Next Hoptag tag or VC or Tunnel Id switched interface

28 27 204.134.83.1 255.255.255.255 0 Se0/3 point2point

Service Provider Network Configuration

with IS-IS

In this section, a sample network is configured with BGP between the

PE and CE routers IS-IS is configured as the service provider IGP Figure B.3 illustrates this network

F I G U R E B 3 A service provider network to be configured with IS-IS

Figure B.4 illustrates the routing protocol utilization in the service provider network illustrated in Figure B.3

F I G U R E B 4 Network protocol utilization

Peer 2

Serial 0 Serial 0/1 Serial 0/0 Serial 0/1 Serial 0/0 Serial 0/3 Serial 0/1 Serial 0

Peer 2 BGP

AS 65002

Peer 1 BGP

AS 65001

I-BGP

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Table B.3 lists the IP addresses and interfaces of the CE devices in Figure B.3

Table B.4 lists the IP addresses and interfaces of the service provider devices in Figure B.3

Router Configuration

This section shows the configuration of all the network devices in the example network The peer routers run BGP, the Atlanta and Raleigh POP routers run OSPF and BGP, and the Core router runs only OSPF

Peer 1 Router Configuration

On the Peer 1 router, MPLS is not enabled; only standard BGP is enabled

T A B L E B 4 Service Provider Addressing

Device Loopback 0 Serial 0/0 Serial 0/1 Serial 0/3

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version 12.1service timestamps debug uptimeservice timestamps log uptime

!hostname Peer1

ip address 192.168.1.1 255.255.255.255

!interface Ethernet0

!interface Serial0 description *** Link to Atlanta POP ***

ip address 192.168.3.5 255.255.255.252

no fair-queue

!interface Serial1

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router bgp 65001

!end

Atlanta POP Router Configuration

On the Atlanta POP router, standard IS-IS is configured as the IGP I-BGP is set up between the Atlanta and Raleigh POP routers An E-BGP session is set

up between the Atlanta POP router and Peer 1 Tag switching is enabled only

on the internal service provider link

Atlanta#show running-config

Current configuration : 1556 bytesSimpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com

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version 12.1service timestamps debug uptimeservice timestamps log uptime

!hostname Atlanta

ip address 204.134.83.1 255.255.255.255

ip router isis

ip address 204.134.83.5 255.255.255.252

ip router isis tag-switching ip

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interface Serial0/1 description *** Link to Peer1 ***

!router isis net 49.0001.1111.1111.1111.00 is-type level-1

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router bgp 65000

!end

Core Router Configuration

On the Core router, standard IS-IS is configured as the IGP Tag switching

is enabled on the two service provider links

Core#show running-config

Current configuration : 1317 bytesSimpo PDF Merge and Split Unregistered Version - http://www.simpopdf.com

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