IP Address Space Depletion

The growing demand for IP addresses has put a severe strain on the classful model. Most companies requesting Class B addresses have estimated that a Class B address would best accommodate their requirements because of the balance between the number of networks and the number of hosts. A Class A ...

Better Protection of Enable and Username Passwords

The password required by the enable command can be defined by either the enable password pw command or the enable secret pw command. If both are configured, the enable exec command only accepts the password defined in the enable secret command. The password in the enable password command follows the...

Access-Edge Trust Models

A primary function of access-edge policies is to establish and enforce trust boundaries. A trust boundary is the point within the network where markings (such as CoS or DSCP) begin to be accepted. Previously set markings are overridden (as required) at the trust boundary. The design objective rel...

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 Router-ID

EIGRP uses a concept of a representing each router with a router ID (RID). The EIGRP RID is a 32-bit number, represented in dotted decimal. Each router determines its RID when the EIGRP process starts, using the same general rules as does OSPF for determining the OSPF RID, as follows: Step 1. Us...

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