【正文】 s and sub mask for each VLAN. Each subinterface has an encapsulation. Use the following mands to verify the interVLAN routing configuration and functionality. Switch show trunk Router show ip interfaces Router show ip interfaces brief Router show ip route 思科網絡技術學院理事會 . 95 Maintaining VLANs on Enterprise Network 96 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? VLAN Trunking Protocol (VTP) is a Layer 2 messaging protocol. ? VTP reduces the task of VLAN management and monitoring. 97 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? VTP Management domain All switches under a mon administration are part of a domain. Each domain has a unique name. VTP switches only share VTP messages with other switches in the same domain. ? VTP Version Version 1 is the default version and it is not patible with Version 2. All switches must be configured with the same version. 98 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? VTP modes: server, client, default, all switches are servers. 99 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? Each VTP switch saves a VLAN database in NVRAM that contains a revision number. ? When adding a new switch to an existing work, Reboot the switch just prior to adding it to the work to reset the revision number. Make sure the new switch is configured in client or transparent mode. Configure a VTP password to validate the switch. 100 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? VTP messages Summary advertisements: Contain the current VTP domain name and the configuration revision number. Subset advertisements: Contains the new VLAN information based on the summary advertisement. Advertisement requests: VTP clients use advertisement requests to ask for VLAN information. 101 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 102 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 103 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 104 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 105 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 106 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 107 思科網絡技術學院理事會 . VLAN Trunking Protocol (VTP) ? The exchange of VTP information 108 思科網絡技術學院理事會 . Configuring VTP ? When adding a new switch to an existing VTP domain, use the following steps: Step 1: Configure VTP offline (version 1) Switch(config)vtp domain domain_name Switch(config)vtp mode (server | client | transparent） Switch(config)vtp password password Switch(config)end Switchcopy runningconfig startupconfig Step 2: Verify the VTP configuration. Switchshow vtp status Step 3: Reboot the switch. Switchreload Switchshow vtp password Switchshow vtp counters 109 思科網絡技術學院理事會 . VLAN Support for IP Telephony and Wireless ? VLANs and IP phones ? VLANs and wireless security 110 思科網絡技術學院理事會 . VLAN Best Practices ? Some best practices for configuring VLANs in an enterprise work are: Organizing server placement Disabling unused ports Configuring the management VLAN as a number other than 1 Using VLAN Trunking Protocol Configuring VTP Domains Reboot any new switch entering an established work. (VTP Revision Number) 111 思科網絡技術學院理事會 . Summary ? Switches forward traffic using store and forward or cutthrough techniques ? Basic security features should be applied to switches ? A VLAN is a way to group hosts on the same logical work even though they may be physically separated ? Frame tagging allows a switch to identify the source VLAN of an Ether frame ? A Layer 3 device is needed to move traffic between different VLANs ? Subinterfaces allow router interfaces to support multiple VLANs. ? VLAN Trunking Protocol provides centralized control, distribution and maintenance of VLANs 112 思科網絡技術學院理事會 .