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 RSM

In the case of the router-on-a-stick design, traffic flows to the router within the source VLAN where it is routed into the destination VLAN. This created an out and back flow to the router. Technically, the Catalyst 5000 RSM uses a very similar flow, but with one important difference: the stick be...

Using MSDP to Discover External Sources

The typical way to configure Multicast Source Discovery Protocol (MSDP) involves first selecting one of your MBGP routers as the RP for your internal network. Then you set up an MSDP peer relationship with the RP in another Autonomous System, which is usually an MBGP peer router in the next domain....

EIGRP Authentication Configuration Checklist

The EIGRP authentication configuration process requires several commands, which are summarized as follows: Step 1.    Create an (authentication) key chain: Create the chain and give it a name with the key chain name global command (also puts the user into key chain config mode). T...

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