Deploying OSPF
Configuration Roadmap
Figure 1-20 OSPF neighbor relationship diagram 
Configuration Roadmap
Use OSPF as an IGP to ensure that network-wide devices can be reached through routes and set up MPLS LDP and MPLS TE over OSPF routes. The configuration roadmap is as follows:
Add all devices to area 0 and advertise the directly connected network segment and the address of loopback interface 1.
Configure all interfaces that do not run OSPF as OSPF silent interfaces to disable the interfaces from sending or receiving OSPF packets. The configuration makes the OSPF network more adaptive and saves network resources.
Considering the impact of 31-bit subnet masks, configure the OSPF network type to point-to-point on the main interoperation interface.
Configure synchronization between OSPF and LDP to prevent traffic loss caused by switchovers of the primary and backup LSPs.
Deploying OSPF
Context
Configuring OSPF ensures that user-end provider edges (UPEs) and superstratum provider edges (SPEs) can be reached through public network routes.
Procedure
Configure SPEs.
The following uses the configuration of Core_SPE1 on the core ring as an example. The configurations of Core_SPE2 and Core_SPE3 are similar to the configuration of Core_SPE1, and are not mentioned here.
router id 172.16.0.5 //Configure a router ID. # interface Eth-Trunk4 ospf network-type p2p //Set the OSPF network type to P2P on the interfaces using IP addresses with 31-bit subnet masks. # interface Eth-Trunk5 ospf network-type p2p # interface Eth-Trunk17 ospf network-type p2p # interface XGigabitEthernet6/0/4 ospf network-type p2p # ospf 1 silent-interface all //Prohibit all interfaces from receiving and sending OSPF packets. undo silent-interface Eth-Trunk4 //Allow interfaces to receive and send OSPF packets. undo silent-interface Eth-Trunk5 undo silent-interface Eth-Trunk17 undo silent-interface XGigabitEthernet6/0/4 spf-schedule-interval millisecond 10 //Set the route calculation interval to 10 ms to speed up route convergence. lsa-originate-interval 0 //Set the LSA update interval to 0. lsa-arrival-interval 0 //Set the interval for receiving LSAs to 0 so that topology or route changes can be immediately detected to speed up route convergence. graceful-restart period 600 //Enable OSPF GR. flooding-control //Enable flooding-control to stabilize neighbor relationships. area 0.0.0.0 authentication-mode md5 1 cipher %^%#NInJJ<oF9VXb:BS~~9+JT'suROXkVHNG@8+*3FyB%^%# //Set the authentication mode and password for the OSPF area. network 172.16.0.5 0.0.0.0 network 172.17.4.2 0.0.0.0 network 172.17.4.8 0.0.0.0 network 172.17.4.10 0.0.0.0 network 172.17.10.2 0.0.0.0 #
Configure UPEs.
The following uses the configuration of Site1_UPE1 as an example. The configurations of Site1_UPE2, Site2_UPE3, Site2_UPE4, Site3_UPE5, and Site3_UPE6 are similar to the configuration of Site1_UPE1, and are not mentioned here.
router id 172.16.2.51 # interface Eth-Trunk7 ospf network-type p2p # interface Eth-Trunk17 ospf network-type p2p # ospf 1 silent-interface all undo silent-interface Eth-Trunk7 undo silent-interface Eth-Trunk17 graceful-restart period 600 bandwidth-reference 100000 //Set the bandwidth reference value used by the system to calculate the interface cost based on a formula. flooding-control area 0.0.0.0 authentication-mode md5 1 cipher %^%#nU!dUe#c'J!;/%*WtZxQ<gP:'zx_E2OQnML]q;s#%^% # network 172.16.2.51 0.0.0.0 network 172.17.4.11 0.0.0.0 network 172.17.4.14 0.0.0.0 #
Checking the Configuration
Run the display ospf peer command to check OSPF neighbor information. Using Core_SPE1 as an example, if the value of State is Full, OSPF neighbor relationships have set up successfully.
[Core_SPE1]display ospf peer OSPF Process 1 with Router ID 172.16.0.5 Neighbors Area 0.0.0.0 interface 172.17.4.8(Eth-Trunk4)'s neighbors Router ID: 172.16.0.3 Address: 172.17.4.9 GR State: Normal State: Full Mode:Nbr is Slave Priority: 1 DR: None BDR: None MTU: 0 Dead timer due in 40 sec Retrans timer interval: 4 Neighbor is up for 00:53:42 Authentication Sequence: [ 0 ] Neighbors Area 0.0.0.0 interface 172.17.4.2(Eth-Trunk5)'s neighbors Router ID: 172.16.0.4 Address: 172.17.4.3 GR State: Normal State: Full Mode:Nbr is Master Priority: 1 DR: None BDR: None MTU: 0 Dead timer due in 37 sec Retrans timer interval: 4 Neighbor is up for 00:53:22 Authentication Sequence: [ 0 ] Neighbors Area 0.0.0.0 interface 172.17.4.10(Eth-Trunk17)'s neighbors Router ID: 172.16.2.51 Address: 172.17.4.11 GR State: Normal State: Full Mode:Nbr is Slave Priority: 1 DR: None BDR: None MTU: 0 Dead timer due in 31 sec Retrans timer interval: 4 Neighbor is up for 00:53:34 Authentication Sequence: [ 0 ] Neighbors Area 0.0.0.0 interface 172.17.10.2(XGigabitEthernet6/0/4)'s neighbors Router ID: 172.16.2.86 Address: 172.17.10.3 GR State: Normal State: Full Mode:Nbr is Master Priority: 1 DR: None BDR: None MTU: 0 Dead timer due in 32 sec Retrans timer interval: 5 Neighbor is up for 00:53:42 Authentication Sequence: [ 0 ]
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S6700, S7700, and S9700 Series Switches Typical Configuration Examples
