Even when PIM routing is in place, RPs must be configured correctly to find traffic sources. The command show ip pim rp allows you to inspect the configured RPs and look at the mappings that have been applied. The full command is Router(config)#show ip pim rp [group-name | group-address | mapping] Using show ip pim rp, without further modifiers, displays RPs for active groups. If the command is modified with the group name, then only the RPs for the select..
Highest Local Preference (LOCAL_PREF)
The BGP LOCAL_PREF PA allows routers in an AS with multiple exit points to choose which exit point is used to reach a particular NLRI. To do so, the router that is the desired exit point sets the LOCAL_PREF for its eBGP route for that NLRI to a relatively high value, then advertises that route via iBGP. The other routers in the same AS can learn of multiple routes to reach the NLRI, but they will choose the route with the higher LOCAL_PREF as the best route. Table 13-11 summ..
When two or more wireless stations transmit at the same time, their signals become mixed. Receiving stations can see the result only as garbled data, noise, or errors. No clear-cut way exists to determine whether a collision has occurred. Even the transm itting stations won’t realize it because their receivers must be turned off while they are transmitting. As a basic feedback mechanism, whenever a wireless station transmits a frame, the receiving wireless station must send..
Tunneling with Dynamic Routing Protocols
Dynamic routing and tunnels can be a dangerous combination. It is critical to ensure that the routers never get confused and think that the best path to the tunnel destination is through the tunnel itself. We offer three different ways of resolving this problem. The first is to use static routes for the tunnel destination address: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#interface Tunnel1 Router1(config-i..
Configuring Routing for a Low-Frequency Multicast Application
PIM-SM is best suited to this type of application. The configurations of the RP and BSR or Auto-RP routers for this example are identical to those. The differences appear on the other routers in the network. So this recipe shows only the configurations for these other routers: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ip multicast-routing Router1(config)#ip pim spt-threshold 10 group-list 15 Router1(con..
