Cisco Systems 1400 series, 1600R manual Verifying Sham-Link Creation, Command Purpose

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OSPF Sham-Link Support for MPLS VPN

Configuration Tasks

To create a sham-link, use the following commands starting in EXEC mode:

 

Command

Purpose

Step 1

 

 

Router1# configure terminal

Enters global configuration mode on the first PE router.

Step 2

 

 

Router1(config)# interface loopback

Creates a loopback interface to be used as an endpoint of the

 

interface-number

sham-link on PE-1 and enters interface configuration mode.

Step 3

 

 

Router1(config-if)# ip vrf forwarding

Associates the loopback interface with a VRF. Removes the IP

 

vrf-name

address.

Step 4

 

 

Router1(config-if)# ip address ip-address

Reconfigures the IP address of the loopback interface on PE-1.

 

mask

 

Step 5

 

 

Router1(config-if)# end

Returns to global configuration mode.

Step 6

 

 

Router1(config)# end

Returns to EXEC mode.

Step 7

 

 

Router2# configure terminal

Enters global configuration mode on the second PE router.

Step 8

 

 

Router2(config)# interface loopback

Creates a loopback interface to be used as the endpoint of the

 

interface-number

sham-link on PE-2 and enters interface configuration mode.

Step 9

 

 

Router2(config-if)# ip vrf forwarding

Associates the second loopback interface with a VRF. Removes

 

vrf-name

the IP address.

Step 10

 

 

Router2(config-if)# ip address ip-address

Reconfigures the IP address of the loopback interface on PE-2.

 

mask

 

Step 11

 

 

Router2(config-if)# end

Returns to global configuration mode.

Step 12

 

 

Router1(config)# end

Returns to EXEC mode.

Step 13

 

 

Router1(config)# router ospf process-id

Configures the specified OSPF process with the VRF associated

 

vrf vrf-name

with the sham-link interface on PE-1 and enters interface

 

 

configuration mode.

Step 14

 

 

Router1(config-if)# area area-id

Configures the sham-link on the PE-1 interface within a specified

 

sham-linksource-address

OSPF area and with the loopback interfaces specified by the IP

 

destination-address cost number

addresses as endpoints. cost number configures the OSPF cost for

 

 

 

 

sending an IP packet on the PE-1 sham-link interface.

Step 15

 

 

Router2(config)# router ospf process-id

Configures the specified OSPF process with the VRF associated

 

vrf vrf-name

with the sham-link interface on PE-2 and enters interface

 

 

configuration mode.

Step 16

 

 

Router2(config-if)# area area-id

Configures the sham-link on the PE-2 interface within a specified

 

sham-linksource-address

OSPF area and with the loopback interfaces specified by the IP

 

destination-address cost number

addresses as endpoints. cost number configures the OSPF cost for

 

 

 

 

sending an IP packet on the PE-2 sham-link interface.

 

 

 

Verifying Sham-Link Creation

To verify that the sham-link was successfully created and is operational, use the show ip ospf

sham-linkscommand in EXEC mode: Router1# show ip ospf sham-links

Sham Link OSPF_SL0 to address 10.2.1.2 is up

Area 1 source address 10.2.1.1

Run as demand circuit

DoNotAge LSA allowed. Cost of using 40 State POINT_TO_POINT,

Cisco IOS Release 12.2(8)T

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Contents Feature History ReleaseModification Feature OverviewUsing Ospf in PE-CE Router Connections Using a Sham-Link to Correct Ospf Backdoor Routing From 0.0.0.0 PE-1#show ip bgp vpnv4 allPE-1#show ip route vrf ospf Sham-Link Configuration Example Vpnv4 all tag begin Sham-Link ExampleClient Site Connection Across the Mpls VPN Backbone Flexible Routing in an Mpls VPN ConfigurationBenefits Related Documents Related Features and TechnologiesSupported Platforms RestrictionsDetermining Platform Support Through Cisco Feature Navigator Creating a Sham-Link Configuration TasksSupported Standards, MIBs, and RFCs PrerequisitesVerifying Sham-Link Creation Command PurposeShow ip ospf sham-links Configuration ExamplesCommand Reference Monitoring and Maintaining a Sham-LinkArea sham-link cost Command Modes Command History120 ExamplesRouter1# show ip ospf sham-links DefaultsShow ip ospf sham-links Usage GuidelinesGlossary
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1600R, 1600, 1400 series specifications

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