Cisco - Introduction to xDSL Technology 203

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If there were a T1 between two sites, and it was imperative that the link see very little downtime, DDR might be enabled on a BRI ISDN port. If the T1 were to fail, the BRI would establish connectivity over at least one of its data channels (B-channel), and could be configured to enable the second channel if traffic needs were to reach a defined threshold. DDR spoofs routing tables to provide the image of full-time connectivity using Dialer interfaces and filters out interesting packets for establishing, maintaining, and releasing switched connections.

2 - IEEE LAN protocol that specifies an implementation of the LLC sublayer of the data link layer. 2 handles errors, framing, flow control, and the network layer (Layer 3) service interface. 5 LANs. 3 - IEEE LAN protocol that specifies an implementation of the physical layer and the MAC sublayer of the data link layer. 3 uses CSMA/CD access at a variety of speeds over a variety of physical media. 3 standard specify implementations for Fast Ethernet. This is the specification that describes Ethernet.

STP is software based: if the CPU is over-utilized, it is possible that it can lack the resources necessary to send out BPDUs. Also, software bugs are possible. • When the age field of a BPDU goes beyond max age, it is discarded - this occurs if the diameter of the STP network is too large, making the root switch too far from some distant switches. • To limit the risk implied by the use of the STP, it is recommended that you reduce (as much as possible) the number of blocked ports - prune VLAN not needed off your trunks and use the PortFast command on those user ports that will never have switches or bridges installed.

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