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...

Role of Identity in Secure Networking

Although there are clearly right and wrong ways to deploy security technologies, identity is less obvious. From a network designer's perspective, you must start by deciding where and what kind of identity information you must acquire. Broadly defined, there are three potential network identity paths: 1.    Device to network A device authenticates to the network or another device within the network. 2.    User to network A user authenticates to t..

RSTP Port Behavior

 In 802.1D, each switch port is assigned a role and a state at any given time. Depending on the ports proximity to the Root Bridge, it takes on one of the following roles: ■ Root port ■ Designated port ■ Blocking port (neither root nor designated) The Cisco-proprietary UplinkFast feature also reserved a hidden alternate port role for ports that offered parallel paths to the root but were in the Blocking state. Recall that each switch port also is assigned one of f..

Filtering PIM Neighbors

In this example, we will configure a neighbor filter on Router1's FastEthernet interface, which it uses to connect to a foreign router called Router2: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ip multicast-routing Router1(config)#interface FastEthernet0/0 Router1(config-if)#ip address 192.168.1.1 255.255.255.0 Router1(config-if)#ip pim sparse-mode Router1(config-if)#ip pim neighbor-filter 18 Router1(..

Changing Administrative Distances

When dealing with administrative distances, always bear in mind that they only affect route selection on this particular router. Administrative distances are not distributed by the routing protocols. However, they can affect the routing protocols. Distance vector algorithms in particular only distribute the routes that are used locally. Adjusting the administrative distance could change which routes are used. So you should always be extremely careful when adjusting administra..