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

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13: VLANs and Trunks
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VTP Pruning Mode : Enabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x95 0xAB 0x29 0x44 0x32 0xA1 0x2C 0x31 Configuration last modified by 0000 at 3-1-03 15:18:37 Local updater ID is 19216814 on interface Vl1 (lowest numbered VLAN interface found)
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In this example, 17 configuration changes have occurred (examine the Configuration Revision field) The switch is operating in server mode in the dealgroup domain
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The vtp password command is used to authenticate VTP messages between switchesThe show vtp status command will display the VTP
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mode in which the switch is operating, the con guration revision number, and the VTP domain to which the switch belongs
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The following command displays VTP statistics concerning VTP messages sent and received:
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switch # show vtp counters VTP statistics: Summary advertisements received : 12 Subset advertisements received : 0 Request advertisements received : 0 Summary advertisements transmitted : 7 Subset advertisements transmitted : 0 Request advertisements transmitted : 0 Number of config revision errors : 0 Number of config digest errors : 0 Number of V1 summary errors : 0
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In this example, you can see that the switch has sent and received VTP summary advertisements
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1301 The CD contains a multimedia demonstration of configuring and verifying VTP on a switch
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VLAN Con guration
Con guring Trunks
This section covers the setup of trunk connections on your switches using the 8021Q trunking protocol Before getting into the configuration, however, you should first be familiar with a protocol that is used to form a trunk between two devices: the Dynamic Trunk Protocol (DTP) One limitation of trunks is that they don t work with the port security and 8021x authentication features; these features are used on access-links
Dynamic Trunk Protocol (DTP)
Cisco s proprietary trunking protocol is used on trunk connections to form trunks dynamically DTP is used to form and verify a trunk connection dynamically between two Cisco switches DTP supports five trunking modes, shown in Table 13-4 If the trunk mode is set to on or trunk for an interface, this causes the interface to generate DTP messages on the interface and to tag frames on the interface, based on the trunk type (8021Q on the 2960s) When set to on, the trunk interface always assumes the connection is a trunk, even if the remote end does not support trunking Some of Cisco s switches use the term trunk instead of on, like the 2960s If the trunk mode is set to desirable, the interface will generate DTP messages on the interface, but it will make the assumption that the other side is not trunk-capable and will wait for a DTP reply message from the remote side In this state, the interface starts as an access-link connection If the remote side sends a DTP message, and this message indicates that trunking is compatible between the two switches, a trunk will be formed and the switch will start tagging frames on the interface If the other side does not support trunking, the interface will remain as an access-link connection If the trunk mode is set to auto, the interface passively listens for DTP messages from the remote side and leaves the interface as an access-link connection If the interface receives a DTP message, and the message matches trunking capabilities of the interface, then the interface will change from an access-link connection to a
TABLE 13-4
DTP Mode
On or trunk Desirable Auto Off No-negotiate
Generate DTP Messages
Yes Yes No No No
Default Frame Tagging
Yes No No No Yes
DTP Modes and Operation
13: VLANs and Trunks
trunk connection and start tagging frames This is the default DTP mode for a Cisco switch interface that is trunk-capable If an interface is set to no-negotiate, the interface is set as a trunk connection and will automatically tag frames with VLAN information; however, the interface will not generate DTP messages: DTP is disabled This mode is typically used when connecting trunk connections to non-Cisco devices that don t understand Cisco s proprietary trunking protocol and thus won t understand the contents of these messages If an interface is set to off, the interface is configured as an access-link No DTP messages are generated in this mode, nor are frames tagged Table 13-5 shows when switch connections will form a trunk In this table, one side needs to be configured as either on or desirable and the other side as on, desirable, or auto, or both switches need to be configured as no-negotiate Note that if you use the no-negotiate mode, trunking is formed but DTP is not used, whereas if you use on, desirable, or auto, DTP is used One advantage that DTP has over no-negotiate is that DTP checks for the trunk s characteristics: if they don t match on the two sides (for instance, as to the type of trunk), then the trunk will not come up and Remember the DTP the interfaces will remain as an access-link information in Tables 13-4 and 13-5 for connection With no-negotiate, if the trunking the exam characteristics don t match on the two sides, the trunk connection will probably fail
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