Migration from VTO to GVRP

Migration from VTO to GVRP, ebook's network

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//-->Migration from Cisco VTP to open standards GVRP protocolTechnical white paperTable of contentsOverview.....................................................................................................................................2Introduction to VTP ....................................................................................................................2VTP domains and operation ....................................................................................................2VTP pruning ..........................................................................................................................2VTP messages .......................................................................................................................3VTP Version 1 and VTP Version 2 ............................................................................................5VTP restrictions ......................................................................................................................5Introduction to GVRP .................................................................................................................5About GARP .........................................................................................................................6How GARP works ..................................................................................................................6GARP messages ....................................................................................................................6GARP timers .........................................................................................................................7GARP PDU format .................................................................................................................7About GVRP .........................................................................................................................8GVRP registration modes ........................................................................................................8VTP configuration and verification procedures ..................................................................................9Network diagrams ....................................................................................................................9Configuring VTP on Cisco Switches ...........................................................................................10Verifying the configuration .......................................................................................................10Displaying VTP statistics .......................................................................................................10Displaying VTP configuration ................................................................................................11Displaying VLAN information ................................................................................................11GVRP configuration and verification procedures .............................................................................12Network diagrams ..................................................................................................................12Default settings .......................................................................................................................12Configuring GVRP on switches .................................................................................................12Verifying the configuration .......................................................................................................12Displaying GVRP configuration .............................................................................................12Displaying GVRP statistics ....................................................................................................13Displaying VLAN information ................................................................................................13Migrating from VTP to GVRP ........................................................................................................13For more information...................................................................................................................14OverviewThis document explains the process one needs to follow in order to migrate from Cisco Virtual Local Area Network(VLAN) Trunking Protocol to industry-standard VLAN Registration Protocol used on HP Networking.Introduction to VTPThe Cisco proprietary Virtual Trunking Protocol (VTP) provides functionality similar to GARP VLAN RegistrationProtocol (GVRP). Both protocols advertise VLAN configurations in a switched LAN.VTP domains and operationVTP advertises VLAN configurations in VTP domains. A switch can be located in only one VTP domain. Each switch ina VTP domain works in server, client, or transparent mode. A VTP server adds, deletes, modifies, and broadcastsVLAN configurations to all VTP clients. A VTP client receives and synchronizes its database with the VLANconfigurations advertised by the VTP server. A transparent switch does not participate in VTP. It forwards VTPmessages out on all trunk ports.By default, a VTP-capable switch operates in server mode and has no VTP domain configuration. It learns domainnames from VTP messages sent by other VTP switches.The VTP advertised VLAN configurations are saved in non-volatile random-access memory (NVRAM) and can survivea reboot.VTP pruningVTP pruning dynamically removes unused VLANs on a port. You can also manually remove unused VLANs on a port.VLAN pruning delivers these benefits:1. Reduces the size of a VLAN broadcast domain2. Decreases CPU load3. Simplifies Per-VLAN Spanning Tree topology calculationsFigure 1 shows a VTP-enabled LAN without VLAN pruning. The unicast unknown or broadcast traffic in Red VLAN isflooded to all switches in the network, even though no Red VLAN members connect to Switches 3, 5, and 6.Figure 1:Traffic flooding in a VTP-enabled LAN without pruningFlooding traffic without VTP pruningCatalyst seriesSwitch 4Interface 2Catalyst seriesSwitch 5Catalyst seriesSwitch 2RedVLANInterface 1Catalyst seriesSwitch 6Catalyst seriesSwitch 3Catalyst seriesSwitch 12Figure 2 shows the same network with VTP pruning enabled. The unicast unknown or broadcast traffic in Red VLAN isnot flooded to Switches 3, 5, and 6, because it has been pruned on the trunk port connected to them.Figure 2:Traffic flooding in a LAN with VTP pruning enabledFlooding traffic with VTP pruningSwitch 4Interface 2Interface 4Flooded trafficis prunedSwitch 2Switch 5Interface 5RedVLANInterface 1Switch 6Switch 3Switch 1VTP messagesVTP messages are transmitted in VLAN 1. You can encrypt VTP messages, but must ensure that all VTP switches in theVTP domain use the same password.Summary advertisementsA VTP switch sends summary advertisements to inform other VTP switches of its current VTP domain name and theconfiguration revision number. When a VTP switch receives a summary advertisement, it compares the VTP domainname with its own VTP domain name. If the name is different, the switch ignores the advertisement. If the name is thesame, the switch compares the configuration revision number with its own revision number. If the received revisionnumber is equal or lower, the switch ignores the advertisement. If it is higher, the switch sends an advertisementrequest.3Figure 3:Summary advertisement formatSummary advert packet format1230 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1VersionCodeFollowersMgmtD LenManagement domain name (zero-padded to 32 bytes)Configuration revision numberUpdater identityUpdater timestamp (12 bytes)MD5 digest (16 bytes)The Followers field indicates whether this summary advertisement is followed by subset advertisements.Subset advertisementsA VTP server sends subset advertisements to inform its VTP clients of any VLAN changes you have made on it.Figure 4:Subset advertisement packet formatSummary advert packet format1230 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1VersionCodeSequence numberMgmtD LenManagement domain name (zero-padded to 32 bytes)Configuration revisionVLAN-info field 1……………………………………………………………..VLAN-info field N4Figure 5 shows the format of the VLAN-info field.Figure 5:The VLAN-info field formatV–info–lenISL VLAN-idStatusVLAN-typeVLAN–name LenMTU size802.10 indexVLAN-name (padded with zeros to multiple of 4 bytes)Advertisement requestsA VTP switch sends an advertisement request when it receives a summary advertisement that has a higherconfiguration revision number and zero followers. When the summary advertisement sender receives the request, itsends another summary advertisement followed by one or several subset advertisements.Figure 6:Advertisement request packet formatAdvertisement request packet format1230 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1VersionCodeRsvdMgmtD LenManagement domain name (zero-padded to 32 bytes)Start valueVTP Version 1 and VTP Version 2VTP Version 2 provides almost the same functionality as VTP Version 1, except that VTP Version 2 supports TokenRing VLANs. Use VTP Version 1 if you are not in a Token Ring environment.VTP restrictions•VTP Version 1 and VTP Version 2 do not support extended VLANs 1006 to 4094.•VTP does not interoperate with the IEEE GVRP.Introduction to GVRPThe GVRP is a Generic Attribute Registration Protocol (GARP) application. It uses the operating mechanism andmessages of GARP.5 [ Pobierz całość w formacie PDF ]

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