Cisco WS-X6416-GE-MT - Interface Module - Expansion Instrukcja Użytkownika Pobierz pdf (Strona 23)

White Paper

update requirements are met by the default Cisco Catalyst OS operation, whereas the Cisco IOS

Software update model requires an alternative update operation.

For this alteration, a VLAN database was introduced into Cisco IOS Software for the Cisco

Catalyst 6500 as a method for immediately saving VTP updates for VTP clients and servers. This

VLAN database is in the form of a separate file in NVRAM, called the vlan.dat file. Viewed with sh

vtp status, the vlan.dat file stores VTP/VLAN information for VTP client or VTP server systems.

The entire VTP/VLAN configuration is not backed up to the Startup Config file in NVRAM when a

copy run start command is issued on these systems.

This does not apply to systems running as VTP transparent. VTP transparent systems back up the

entire VTP/VLAN configuration to the Startup Config file in NVRAM when you issue a copy run

start command.

VTPv3 for Cisco Catalyst OS

Cisco Catalyst OS supports a new version of VTP, VTP Version 3 (VTPv3). VTPv3 supports the

advertisement of the extended range of VLANs (4094). Configuration changes for the entire 4K

VLAN range can be made centrally on one switch and automatically communicated to all other

switches in the network.

Additionally, VTPv3 removes the risk of losing or overwriting the domain configuration when

introducing a misconfigured or unauthorized server. It does this by introducing the concept of both

primary and secondary servers and by allowing the partitioning of domains. Users must statically

define what server will become a primary server. Below is a description of the VTP devices

available for a domain (Figure 8):

●

A VTPv3 primary server can create, modify, and delete VLANs and specify other

configuration parameters for the domain. The primary servers advertise their VLAN

configuration to the switches in the same VTP domain and synchronize their VLAN

configuration with other switches based on advertisements received over trunk links (similar

to existing VTP versions).

●

A VTPv3 secondary server is a hybrid between the original client and server; it is able to

store the configuration of the domain but cannot modify it.

●

A VTPv3 client only receives the configuration from the network and cannot save or modify

it (unchanged from existing VTP versions).

Figure 8. VTP Devices and Domains

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