Configuring Destination Port Permit Lists (Optional)
To prevent accidental configuration of ports as destinations, you can create a permit list of the ports that are valid for use as destinations. With a destination port permit list configured, you can only configure the ports in the permit list as destinations. To configure a destination port permit list, perform this task: This example shows how to configure a destination port permit list that includes Gigabit Ethernet ports 5/1 through 5/4 and 6/1: Router# configure t..
OSPF provides two levels of hierarchy throughout an area. An area is a 32-bit number that can be defined either in an IP address format of "Area 0.0.0.0" or as a decimal number format, such as "Area 0." Area 0 is a backbone area, which is required if more than one area is configured. All areas must be connected to Area 0; otherwise, virtual links are needed, as shown in Figure 8-18. Figure 8-18. Using a Virtual Link Where an Area Is Not Attached to the Backbone Example 8-..
Network Fault Tolerance and MPLS OAM Mechanisms
Operation, administration, maintenance, and provisioning (OAM&P) encompass a broad set of management functional areas, including fault management, configuration management, accounting management, and security management.[20] A fault (or defect) is an interruption of the capability of a network connection caused by a network element such as link and node failures. Discussion of functions in this section is restricted to fault management and performance management: • ..
When an OSPF network grows beyond a single area, you need to be aware of the role played by each OSPF router in a topology. Specifically, four OSPF router types exist: ■ Internal router: All the networks directly connected to an internal router belong to the same OSPF area. Therefore, an internal router has a single link-state database. ■ Area border router (ABR): An ABR connects to more than one OSPF area and therefore maintains multiple link-state databases (one for e..
Once again, this problem is similar to the RIP, OSPF. First we have to enable the routing protocol on the CE routers, which we do by configuring a new AS number on the CE routers. These devices are part of a different AS than the MPLS cloud, so they must have different AS numbers: Router-CE-A1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router-CE-A1(config)#router bgp 65535 Router-CE-A1(config-router)#neighbor 192.168.1.1 remote-a..
