Link-State Packets

Link-state packets are divided into two types: level 1 and level 2. Level 2 packets contain information about all the reachable prefixes within the IS-IS domain. The topology for level 1 packets is known for the local area only, so these packets are included in the level 1 LSP. Individual LSPs are i...

Configuring Dual-Rate Policing

Dual-rate CB Policing requires the same MQC commands, but with slightly different syntax on the police command, as shown here: police {cir cir} [bc conform-burst] {pir pir} [be peak-burst][conform-action action [exceed-action action [violate-action action]]] Note that the syntax of this command r...

Comparison of the OSPF Restart Mechanisms

The two approaches share many similarities, including the following: ?    Both have the goals of retaining adjacencies with neighbors and continuing to forward across the restart. ?    Both require protocol extensions. ?    Both require support from ne...

PortFast: Access-Layer Nodes

An end-user workstation is usually connected to a switch port in the access layer. If the workstation is powered off and then turned on, the switch will sense that the port link status has gone down and back up. The port will not be in a usable state until STP cycles from the Blocking state to th...

Controlling Neighborships Using EIGRP Authentication

EIGRP authentication causes routers to authenticate every EIGRP message. To do so, the routers should use the same preshared key (PSK), generating an MD5 digest for each EIGRP message based on that shared PSK. If a router configured for EIGRP authentication receives an EIGRP message, and the mess...

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