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..
Layer 2 queuing tools are required to resolve the prioritization issues generated by multiple logical interfaces (such as Frame Relay DLCIs and ATM PVCs) as they contend for the scheduling of a single physical parent interface. These include the following: • Frame Relay Dual-FIFO • PVC Interface Priority Queuing (PIPQ) Frame Relay Dual-FIFO On the low-end router non-distributed platforms (Cisco 7200 and lower), Frame Relay employs a ..
Changing Privilege Level of IOS Commands
Cisco routers support sixteen privilege levels, ranging from zero to fifteen. By default, Cisco assigns commands to only three of these privilege levels: zero, user, and enable. There are five commands with privilege level zero: disable, enable, exit, help, and logout. The user level (privilege level 1) has a wide variety of commands available that cannot alter the router's configuration. Enable mode (privilege level 15), by contrast, allows complete access to all router comm..
Automatically Generating IPv6 Addresses for an Interface
There are two methods for generating IPv6 addresses automatically. The first uses the autoconfig command: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ipv6 unicast-routing Router1(config)#interface FastEthernet0/0 Router1(config-if)#ipv6 address autoconfig Router1(config-if)#end Router1# The second method uses the EUI-64 method to automatically generate only the host part of the IPv6 address, combined with a ..
Increasing the RIP Input Queue
To increase the size of the shared RIP queue, use the input-queue configuration command: Router2#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#router rip Router2(config-router)#input-queue 200 Router2(config-router)#end Router2# This command allows you to control how much incoming RIP update information the router can hold before it has can process the information and integrate it into its routing table. Sometimes a ro..
