Configuring Destination Trunk VLAN Filtering (Optional)
In addition to filtering VLANs on a trunk, you can also apply the allowed VLAN list to access ports. Destination trunk VLAN filtering is applied at the destination. Destination trunk VLAN filtering does not reduce the amount of traffic being sent from the SPAN sources to the SPAN destinations. When a destination is a trunk, you can use the list of VLANs allowed on the trunk to filter the traffic transmitted from the destination. (CSCeb01318) Destination trunk VLAN filtering r..
Using a Default Set of Authentication Methods
AAA authentication configuration includes commands by which a set of authentication methods is defined. A single authentication method is exactly what it sounds like—a way to authenticate a user. For example, one method is to ask a RADIUS server to authenticate a login user; another is to let a router look at a set of locally defined username commands. A set of configuration methods represents an ordered list of authentication methods, each of which is tried in order until ..
Multiplexing is a fundamental element of network design. Indeed, you could argue that a network is typically one huge multiplexing system. More specifically, however, multiplexing is a tool that provides economies of scale—multiple users share one large resource rather than a number of individual resources. NOTE Multiplexing is the aggregation of multiple independent traffic flows into one large traffic flow. A useful analogy is the freeway system, which mul..
WAN Edge Classification and Provisioning Models
One of the most common questions raised when planning a QoS deployment over the WAN is "How many classes of traffic should be provisioned for?" The following considerations should be kept in mind when arriving at an appropriate traffic class model for a given enterprise. Slow/Medium Link-Speed QoS Class Models Slow-speed ( 768 kbps) links have very little bandwidth to carve up, to begin with. When the serialization implications of sending Interactive-Video into the LL..
Requirements for PPP over Frame Relay
The Request for Comments (RFC) document number 1661 (known as RFC 1661) outlines PPP as an industry standard protocol that supports router-to-router or host-to-network connections between point-to-point links. As a successor to the Serial Line Internet Protocol (SLIP), PPP was designed to work with several different network layer protocols, such as IP, IPX, and SNA. Unlike PPP, the legacy SLIP only supports IP. PPP has added security features, such as Challenge Handshake Aut..
