Removing a Path or Router from the Topology Table
The process of removing a path or router from the topology table is far more complex and gets to the crux of EIGRP. 1. If a network connected to Router A is disconnected, Router A updates its topology and routing table and sends an update to its neighbors. 2. When a neighbor receives the update, it updates the neighbor table and the topology table. 3. The neighbor searches for an alternative route to the remote network. It examines the topology tabl..
802.11 Physical Layer Standards
A wireless LAN enables mobile, portable, and stationary devices to easily communicate with each other within an enterprise facility and throughout a campus environment. For example, retail stores have been using wireless LANs since the early 1990s to enable wireless bar code scanning when performing price marking and inventory applications. Despite the relatively high cost for wireless LAN components at that time, the retail stores were still able to achieve significant retur..
In recursive lookup, the next hop for IBGP routes is not directly connected. This problem must be resolved, as shown in the following output of show ip route for an IBGP-learned route: Routing entry for 200.200.200.0/24 Known via "bgp 2", distance 200, metric 0 Tag 1, type internal Last update from 171.68.181.1 00:45:07 ago Routing Descriptor Blocks: * 171.68.181.1, from 150.150.3.11, 00:45:07 ago Route metric is 0, traf..
Because VRRP and GLBP perform a similar function to HSRP, you can use a similar troubleshooting philosophy. Much like HSRP’s show standby brief command, similar information can be gleaned for VRRP operation with the show vrrp brief command and for GLBP operation with the show glbp brief command. Although HSRP, VRRP, and GLBP have commonalities, it is important for you as a troubleshooter to understand the differences. Table 5-4 compares several characteristics of these fir..
Configuring the LMI Type on a Frame Relay Interface
Cisco supports three different Local Management Interface (LMI) types for Frame Relay: Cisco, ANSI Annex D, and Q933-A Annex A. Beginning with Cisco IOS Software Release 11.2, the LMI autosense feature allows a Frame Relay interface to autodetect the LMI type supported by the directly connected Frame Relay switch. Based on the LMI status messages it receives from the Frame Relay switch, the router automatically configures its Frame Relay interface with the supported LMI type ..
