cisco routing and switching book

and continue to "keep calling". However, if host-d tries to send a frame to host-e within 20 seconds (assuming HOST-E has not already sent the packet), the frame floods all the switch links, because the Ee-ee-ee-ee-ee-ee MAC address is no longer in the Address table. table 6-8 shows that three switches converge in the new topology and the data traffic is also restored after the entry of address Ee-ee-ee-ee-ee-ee in the MAC address table. Table 6-8. Bridge Table Value after topology change

timer should pay attention to two points. 1th, change the timer default time value before you have to deliberate, in this chapter seventh has more detailed discussion. 2nd, even if you are confident about the timer adjustment, you should only modify the timer on the root bridge. As you will see in the following section, the BPDU contains three timer fields, which are passed through three fields to pass the timer value to the rest of the networkAllNetwork Bridge. Consider the other case, each br

disabled 1/2 1 forwarding disabled Multiple domains fully illustrate that Cat-3 is the root bridge: The root ports are port 1/0. Note that the catalyst 4000s,5000s,6000s is not labeled as a 1/0 physical port, and the NPM software uses a reference to the logical control port, SC0, as a "logical root port". Local bid and Root bridge bid match. Root Path Cost is 0. Timer value matches. All ports are in the forwarding state. Look for the end--the root br

The11Day: routing and switching Experiment Lab01:DHCPService Lab Objectives Dynamic DHCP Allocation Protocol Lab Environment Install a Cisco simulator computer 650) This. width = 650; "width =" 465 "Height =" 312 "Title =" image001.png "style =" width: pixel PX; Height: 288px; "src =" http://s3.51cto.com/wyfs02/M02/45/BB/wKioL1PqKKaRC3csAACGSxKdXo0633.jpg "alt =

are sent when the bridge receives better BPDUs.In addition, it also controls the transmission of BPDUs while "saving optimal BPDUs". When the bridge is first activated, all its ports start to send BPDUs every 2 seconds (if the default timer configuration is used), but if a port receives a BPDU from another bridge and the BPDU is better than the sent BPDU, the local port stops sending BPDUs. If a better BPDU is not sent from an adjacent bridge within a period of time (the default of 20 second

port belongs to a link only), and the number of each STP consists of table 6-2.Table 6-2. STP components in a Switch and 146 Segment Network STP Component number Root bridge 1 root port 14 Specify port 146 Also, all options are based on the following four-step comparison principle: Minimum root bridge bid Minimum root path overhead Minimum sender bid Minimum Po