Designated Routers on WANs and OSPF Network Types

Using a DR makes good sense on a LAN because it improves LSA flooding efficiency. Likewise, not using a DR on a point-to-point WAN link also makes sense, because with only two routers on the subnet, there is no inefficiency upon which to improve. However, on nonbroadcast multiaccess (NBMA) networks,...

VMPS and Dynamic VLANs: Advanced Administration

Normally, when you configure a VLAN, you must perform three steps: 1.    Ensure that the Catalyst belongs to a VTP domain 2.    Create a VLAN 3.    Assign ports to the VLAN The first two steps globally affect Catalysts. When you create a VLAN, VTP...

Using Spanning Tree in Real-World Networks

Look at Figure 6-20 for a more complex topology, and see how all this STP detail adds up in the real world. Figure 6-20. A Complex Network with All Links Shown     Figure 6-20 illustrates a network of seven switches connected in a highly redundant (that is, looped...

Configuring CBWFQ for Frame Relay

This section discusses the configuration tasks for enabling CBWFQ on Frame Relay PVCs. CBWFQ is configured via the MQC configuration interface; MQC was explained at the beginning of this chapter. Table 18-1 lists the configuration options available for setting up the traffic classes. Table 18-2 disp...

Using eBGP Multihop

Cisco provides a useful option called eBGP Multihop, which allows you to establish eBGP peer relationships between routers that aren't directly connected to one another: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ip route 172.20...

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