Adding iBGP Routes to the IP Routing Table
Cisco IOS has the same two requirements for adding iBGP routes to the IP routing table as it does for eBGP routes: ■ The route must be the best BGP route. ■ The route must be the best route (according to the AD) in comparison with other routing sources. Additionally, for iBGP-learned routes, IOS considers the concept of BGP synchronization. With BGP synchronization (often called sync) disabled using the no synchronization command, BGP uses the same logic for iBGP route..
Wireless Domain Services (WDS) is a set of Cisco IOS Software features that enhances and simplifies wireless LAN client mobility, security, deployment, and management. WDS offers the following primary services for SWAN: ■ Fast Secure Roaming (FSR)—For time-sensitive applications, enables a wireless client to securely roam between access points in the same subnet or between subnets, enhances channel scanning, and provides fast IEEE 802.1X rekeying. Access point handoff ti..
Troubleshooting PIM Sparse Mode
PIM sparse mode operates differently than dense mode and is more complex. The trouble-shooting steps are similar to the dense mode case. Figure 13-5 shows the troubleshooting flowchart for the PIM sparse mode problem. Figure 13-5. Flowchart for Troubleshooting PIM Sparse Mode Problems The case study that follows examines troubleshooting a PIM sparse mode problem in which the leaf router sends joins to the RP. Figure 13-6 illustrates the network diagram of this case study...
In previous sections about Cisco switching techniques, we discussed how fast switching is performed, how cache is created from the routing table, and what information is kept in cache. You might be wondering how the cache is populated. During the case study, the text discusses what happens when a packet that must be fast-switched reaches the router. The cache is built from the routing table. In the scheme prior to CEF, the routing table is built when the routing..
Configuring an Async Serial Interface
Cisco has a class of serial modules that can support either synchronous or asynchronous communications, as required. You can use the physical-layer async command to change the interface from the default synchronous to asynchronous mode: Router3#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router3(config)#interface Serial1/7 Router3(config-if)#physical-layer async Router3(config-if)#encapsulation ppp Router3(config-if)#exit Router3(con..
