Cisco Aironet 1400 Series Specification Sheet - Page 11
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OSPF Sham-Link Support for MPLS VPN
To create a sham-link, use the following commands starting in EXEC mode:
Command
Step 1
Router1# configure terminal
Step 2
Router1(config)# interface loopback
interface-number
Step 3
Router1(config-if)# ip vrf forwarding
vrf-name
Step 4
Router1(config-if)# ip address ip-address
mask
Step 5
Router1(config-if)# end
Step 6
Router1(config)# end
Step 7
Router2# configure terminal
Step 8
Router2(config)# interface loopback
interface-number
Step 9
Router2(config-if)# ip vrf forwarding
vrf-name
Step 10
Router2(config-if)# ip address ip-address
mask
Step 11
Router2(config-if)# end
Step 12
Router1(config)# end
Step 13
Router1(config)# router ospf process-id
vrf vrf-name
Step 14
Router1(config-if)# area area-id
sham-link source-address
destination-address cost number
Step 15
Router2(config)# router ospf process-id
vrf vrf-name
Step 16
Router2(config-if)# area area-id
sham-link source-address
destination-address cost number
Verifying Sham-Link Creation
To verify that the sham-link was successfully created and is operational, use the show ip ospf
sham-links command 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,
Purpose
Enters global configuration mode on the first PE router.
Creates a loopback interface to be used as an endpoint of the
sham-link on PE-1 and enters interface configuration mode.
Associates the loopback interface with a VRF. Removes the IP
address.
Reconfigures the IP address of the loopback interface on PE-1.
Returns to global configuration mode.
Returns to EXEC mode.
Enters global configuration mode on the second PE router.
Creates a loopback interface to be used as the endpoint of the
sham-link on PE-2 and enters interface configuration mode.
Associates the second loopback interface with a VRF. Removes
the IP address.
Reconfigures the IP address of the loopback interface on PE-2.
Returns to global configuration mode.
Returns to EXEC mode.
Configures the specified OSPF process with the VRF associated
with the sham-link interface on PE-1 and enters interface
configuration mode.
Configures the sham-link on the PE-1 interface within a specified
OSPF area and with the loopback interfaces specified by the IP
addresses as endpoints. cost number configures the OSPF cost for
sending an IP packet on the PE-1 sham-link interface.
Configures the specified OSPF process with the VRF associated
with the sham-link interface on PE-2 and enters interface
configuration mode.
Configures the sham-link on the PE-2 interface within a specified
OSPF area and with the loopback interfaces specified by the IP
addresses as endpoints. cost number configures the OSPF cost for
sending an IP packet on the PE-2 sham-link interface.
Configuration Tasks
Cisco IOS Release 12.2(8)T
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