Normally, routers do not forward broadcast. There are a few times when an exception to this rule would be useful. IP assignment, for instance, would be easier if you did not have to deploy a DHCP server on every segment. If routers passed broadcasts then a central server could take care of remote locations. Cisco IOS allows routers to forward broadcasts through the ip helper-address command. When configured, a router will forward broadcasts to select UDP ports to pred..
The original motivation for developing EIGRP was simply to make IGRP classless. But early in the development the engineers working on the project recalled some academic proposals for a new kind of convergence algorithm and decided to use that algorithm in their extension of IGRP. The result was a protocol that, while retaining some concepts introduced with IGRP such as multiple metrics, protocol domains, and unequal-cost load balancing, is distinctly different from IGRP. EIG..
An MPLS-based network consists of routers and switches interconnected via transport facilities such as fiber links (see Figure 1-1). Customers connect to the backbone (core) network through multiservice edge (MSE) routers. The backbone comprises the core routers that provide high-speed transport and connectivity between the MSE routers. An MSE router contains different types of line cards and physical interfaces to provide Layer 2 and Layer 3 services, including ATM, FR, Ethe..
InterVLAN routing first requires that routing be enabled for the Layer 3 protocol. In the case of IP, you would enable IP routing. In addition, you must configure static routes or a dynamic routing protocol. These topics are covered fully in the CCNP ROUTE course. By default, every switch port on most Catalyst switch platforms is a Layer 2 interface, whereas every switch port on a Catalyst 6500 is a Layer 3 interface. If an interface needs to operate in a different mode, you ..
Configuring a PAgP EtherChannel
To configure switch ports for PAgP negotiation (the default), use the following commands: Switch(config)# interface type mod/num Switch(config-if)# channel-protocol pagp Switch(config-if)# channel-group number mode {on | {{auto | desirable} [non-silent]}} On all Cisco IOS–based Catalyst models, you can select between PAgP and LACP as a channel-negotiation protocol. Some older models, however, offer only PAgP, so the channel-protocol command is not available. Each inte..
