qr code c# free 13: VLANs and Trunks in Objective-C

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13: VLANs and Trunks
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Unlike Cisco routers, every Cisco switch comes with a default configuration For instance, some preconfigured VLANs are already on the switch, including VLAN 1 During the configuration, all VLAN commands refer to the VLAN number, even though you can configure an optional name for the VLAN Every port on your switch, by default, is associated with VLAN 1 And all communications from the switch itself VTP messages, Cisco Discovery Protocol (CDP) multicasts (discussed in 17), and other traffic the switch originates occur in VLAN 1 Recall from 12 that the 2960 s IP configuration is based on the VLAN interface for which you configure your IP address VLAN 1 is sometimes called the management VLAN, even though you can use a different VLAN It is a common practice to put all of your management devices switches, manageable hubs, and management stations in their own VLAN If you decide to put your switch in a different VLAN than VLAN 1, it is recommended that you change this configuration on all your management devices so that you can more easily secure them, since other VLANs would have to go through a layer 3 device to access them; and on this layer 3 device, you can set up access control lists to filter unwanted traffic (discussed in 22) It s important that all your switches are in the same VLAN, since many of the switches management protocols, such as CDP, VTP, and the Dynamic Trunk Protocol (DTP), which is discussed later in this chapter, occur within the switch s management VLAN If one switch had its management VLAN set to 1 and another connected switch had it set to 2, the two switches would lose a lot of interfunctionality
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Remember the VTP defaults listed in Table 13-3 One of the very first VLAN configuration tasks you ll perform on your switch is to set up VTP Table 13-3 shows the default VTP configuration of the 2960 switches The following sections cover the configuration of VTP on the two switches
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None Server None Disabled 1
VTP Default Configuration Values
Your VTP configuration is done from Global Configuration mode on the 2960:
switch(config)# switch(config)# switch(config)# switch(config)# vtp vtp vtp vtp domain VTP_domain_name mode server|client|transparent password VTP_password pruning
The vtp domain command defines the domain name for your switch Remember that in order for switches to share VTP information, they must be in the same domain Messages received from other domains are ignored If you don t configure a domain name, the switch will learn this from a server advertisement The rest of the commands in the configuration are optional The second vtp command defines the VTP mode of the switch If you don t configure this command, the default mode is server You can configure a VTP MD5 password for your switches, which must match the password configured on every switch in the domain Switches will use this password to verify VTP messages from other switches; if the created hashed values placed in VTP messages (generated by taking the VTP message and password and running it through MD5 to create the hash signature) can t be verified, the switches ignore the VTP messages On the 2960 switches, pruning is disabled by default, but you can disable or enable it with the vtp pruning command It is important to note that if pruning is enabled on a server switch, the server switch will propagate this to all other server and client switches in the same domain Once you are done configuring VTP, use this command to check your configuration:
switch# show vtp status VTP Version : 1 Configuration Revision : 17 Maximum VLANs supported locally : 255 Number of existing VLANs : 7 VTP Operating Mode : Server VTP Domain Name : dealgroup
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