Customer premises equipment (CPE) usually includes the router, the CSU/DSU, the cabling, and often an analog modem for OOB (out-of-band) access for monitoring and management. ISPs typically offer the customer a choice of buying the CPE and access line, buying just the access line, or just paying a monthly fee with all equipment and access needs taken care of by the ISP. As with most everything, any arrangement is available at the right price. ISPs usually are responsible for ..
A number of steps must be taken to control access to routers within the network. The first step is to configure access control for each individual router, as follows: service nagle service password-encryption enable secret 5 3242352255 no enable password access-list 16 permit 10.0.1.0 0.0.0.255 banner login ^ This system is the property of ISPnet Networks. Access to this system is monitored. Unauthorized access is prohibited. Contact noc@ISP.net or call +1 555 5..
FRTS supports a variety of queuing tools for managing packets it queues. The queuing tool is enabled via a command in the map class. Example 16-7 shows just such an example, with a new map class. The requirements implemented in this example are as follows: ■ Shape traffic on the two VCs (101 and 102) on s0/0 with the same settings for shaping. ■ Use LLQ only on the VC with DLCI 101. ■ Set Be to 0, and tune Tc to 10 ms. Note that the example does not show the configu..
A primary function of access-edge policies is to establish and enforce trust boundaries. A trust boundary is the point within the network where markings (such as CoS or DSCP) begin to be accepted. Previously set markings are overridden (as required) at the trust boundary. The design objective relating to trust boundaries is to enforce these as close to the endpoints as technically and administratively possible. This is illustrated in Figure 12-3. Figure 12-3. Establishing T..
BGP Internals and Verifying eBGP Neighbors
Similar to OSPF, the BGP neighbor relationship goes through a series of states over time. Although the Finite State Machine (FSM) for BGP neighbor states has many twists and turns, particularly for handling exceptions, retries, and failures, the overall process works as follows: Step 1. A router tries to establish a TCP connection with the IP address listed on a neighbor command, using well-known destination port 179. Step 2. When the three-way TCP connection completes, the..
