FastEther Channel

FastEther Channel (FEC) is a Cisco method that bundles 100 Mbps FAST ETHERNET ports into a logical link. Because any redundant paths between two switches mean some ports will be in a blocking state and bandwidth will be reduced, Cisco developed FEC to maximize bandwidth use. Figure 2-4 displays a sw...

LAN Topology

Like an OSPF designated router (DR), an IS-IS DIS exists to simulate a point-to-point topology across a multipoint environment. Because of this, a DIS is sometimes called a pseudonode. Despite their similarities, the IS-IS DIS is subtly different from OSPF.  The DIS exists separately at Lev...

Multicast Addresses for GLOP Addressing

IANA has reserved the range 233.0.0.0 through 233.255.255.255 (RFC 2770), called GLOP addressing, on an experimental basis. It can be used by anyone who owns a registered autonomous system number (ASN) to create 256 global multicast addresses that can be owned and used by the entity. IANA reserves a...

Configuring a DHCP Relay

If a DHCP server is centrally located in the network, you can configure the multilayer switch to relay DHCP messages between clients and the server, even if they are located on different VLANs or subnets. First, configure a Layer 3 interface that joins the same VLAN as the client machines. This i...

Access List Configuration Tasks

Whether you are creating a standard or extended access list, you need to complete the following two tasks: Step 1  Create an access list in global configuration mode by specifying an access list number and access conditions. Define a standard IP access list using a source address and wildca...

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