ERSPAN supports source ports, source VLANs, and destinations on different switches, which provides remote monitoring of multiple switches across your network (see Figure 41-3). ERSPAN uses a GRE tunnel to carry traffic between switches. ERSPAN consists of an ERSPAN source session, routable ERSPAN GRE-encapsulated traffic, and an ERSPAN destination session. You separately configure ERSPAN source sessions and destination sessions on different switches. To configure an ERSPAN so..
Several types of LSAs exist. This section discusses the nine types of LSAs documented in Table 8-2. Table 8-2. Types of LSA Type LSA Functionality 1 Router Defines the state and cost of the link to the neighbor and IP prefix associated with the point-to-point link. 2 Network Defines the number of routers attached to the segment. It gives information about the subnet mask on that segment. 3..
Troubleshooting an MPOA Network
Troubleshooting an MPOA network is not conceptually difficult. Generically, the first step is to characterize the problem. The most likely symptom is an inability to create a shortcut. Assuming all media is intact between the source and the destination (not always a good assumption), troubleshooting consists of the following: • Ensuring that all ELANs are functional between the source and destination. • Determining that all MPCs and MPSs are operational. •&..
VACLs are configured as a VLAN access map in much the same format as a route map. A VLAN access map consists of one or more statements, each having a common map name. First, you define the VACL with the following global configuration command: Switch(config)# vlan access-map map-name [sequence-number] Access map statements are evaluated in sequence according to the sequence-number. Each statement can contain one or more matching conditions, followed by an action. Next, defin..
Adaptive shaping to ForeSight allows a Cisco router to respond to ForeSight messages and to react to network congestion by enabling VC-level traffic shaping and rate limiting in a timely manner. Adaptive shaping to ForeSight is a component of Frame Relay Traffic Shaping. On Cisco switches, router ForeSight is a network traffic control software that allows the Frame Relay switches to extend ForeSight messages over a User-to-Network (UNI) interface and passes the BECN bit for V..
