Default, Primary, and Backup, Plus Full and Partial Routing
In multihoming to different providers, accepting full routes from either or both providers isnot really necessary unless the customer plans to be a provider itself and pass along full routesto its customers (act as a transit AS). Figure 7-16 illustrates a relevant environment. Figure 7-16. Multihoming to Two Providers with Full and Partial Routing The customer can accept full routing from one or both providers, depending on whether thecustomer requires effective load b..
Before transmitting frames, a station must first gain access to the medium, which is a radio channel that stations share. The 802.11 standard defines two forms of medium access: ■ Distributed coordination function (DCF) ■ Point coordination function (PCF) DCF is mandatory and based on the carrier sense multiple access with collision avoidance (CSMA/CA) protocol. With DCF, 802.11 stations contend for access and attempt to send frames when there is no other station transm..
Deploying EIGRP on a Two-Layer Hierarchical Network
Now that you have had an opportunity to consider many of the techniques that are available to improve EIGRP stability and scalability in a three-layer hierarchical network design, you can explore another common design choice. Many companies that have smaller networks either geographically or topologically, or networks that have stricter latency requirements, use a two-layer network design instead of the traditional three-layer design. This section discusses how to use some of..
To enable the assignment of static IP addresses from a text file, first you must create a static DHCP mapping file on your TFTP server: Freebsd% cat /tftpboot/dhcp.static *time* Aug 17 2006 03:52 PM *version* 2 !IP address Type Hardware address Lease expiration 10.1.1.16 /24 id &nbs..
You can insert a single entry into an existing ACL by specifying a sequence number, as follows: Router2#configure terminal Enter configuration commands, one per line. End with CNTL/Z.Router2(config)#ip access-list extended OREILLY Router2(config-ext-nacl)#12 permit tcp any host 172.25.100.100 eq 20Router2(config-ext-nacl)#endRouter2# The following commands show how t..
