Router Collocation

Collocation is the act of placing one party's equipment on another party's premises. An example of collocation is putting the customer's router at the provider's site or hosting center, as illustrated in Figure 2-12. The customer motivations for such a collocation scheme would be to have the ISP pro...

Managing Forwarding Policy

Because you are ensuring the validity of routes accepted from customers, it is logical that you expect traffic sourced from IP addresses that fall within the range of the offered routes. Packets sourced outside this range are likely to be the result of misconfiguration within the customer's network,...

The Difficulties of Secure Networking

Considering that we as a community have been working at this problem for many, many years, understanding some of the reasons why we still don't have completely secure networks is useful. Security is not as simple as flipping the "secure" switch on a device, and it might never be. There are many reas...

Forming an OSPF Adjacency

Although two OSPF routers can form an adjacency (that is, become neighbors) through the exchange of Hello packets, the following parameters in the Hello packets must match:

Using Multipoint Subinterfaces

You can connect several virtual circuits to a single subinterface as follows: Central#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Central(config)#interface Serial0.1 multipoint Central(config-subif)#description Frame Relay to branches Central(config-s...

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