Improving FIBs: Fast IP Route-Lookup
With the staggering growth of the Internet and consequent demands on core Internet routers, the field of fast IP route-lookup has been the subject of intense interest. Although route churn in the Internet is relatively high, packet forwarding, rather than route-computation, is proving to be the critical area requiring optimization. This signifies that lookup time is optimized at the expense of routing table update time. Route-lookup is the process of finding the best ..
Converting Ethernet and Token Ring MAC Addresses
The Perl script in Example 15-1 converts Ethernet addresses to the way they will appear when connected through a bridge to a Token Ring. It also performs the reverse translation of Token Ring addresses to Ethernet, which is identical. Example 15-1. eth-tok-mac.pl #!/usr/local/bin/perl # # eth-tok-mac.pl -- a script to convert Ethernet to Token Ring MAC # addresse..
The AAA Accounting feature allows you to capture keystrokes and log them on the TACACS+ server: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z.Router1(config)#aaa new-model Router1(config)#aaa accounting commands 1 default stop-only group tacacs+Router1(config)#aaa accounting commands 15 default stop-only group tacacs+Router1(config)#endRouter1# The ability to capture every keystroke entered into a router is a powerful security a..
Monitoring Frame Relay Traffic Shaping Information
This section uses a hub-and-spoke Frame Relay network to illustrate the Cisco IOS show commands, which are useful for monitoring Frame Relay Traffic Shaping information on a Cisco router. The hub-and-spoke Frame Relay network is depicted in Figure 5-4. Figure 5-4. Network Topology for Configuration Examples In this setup, a hub-and-spoke Frame Relay network with a central hub site is connected to three remote branch office sites. The central hub site is connected to ..
As an example of trunk configuration, consider two switches, Switch D and Switch A, which are distribution-layer and access-layer switches, respectively. The two switches are connected by a link between their Gigabit Ethernet 2/1 interfaces. This link should be configured to be a trunk carrying only VLAN numbers 100 through 105, although more VLANs exist and are used. The trunk link should use 802.1Q encapsulation, with VLAN 100 as the native VLAN. First, configure Switch-D t..
