Chapter 10 Managing VLANs
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Table Of Contents
Understanding Virtual LAN (VLAN)
Simplification of Adds, Moves, and Changes
Workgroup and Network Security
Understanding VLAN Creation Summary
Moving Affected Ports to New VLAN
Understanding VLAN Deletion Summary
Interpreting VLAN Summary Information
Creating Secondary VLAN and Associating to Primary VLAN
Associating Ports to Secondary VLAN
Understanding Inter-VLAN Routing
Configuring Inter-VLAN Routing on RSM, MSFC, L2/L3 Devices
Configuring Inter-VLAN Routing on External Routers
Understanding VLAN Trunking Protocol Version 3
Support for VTP Version 3 in Campus Manager
Using VLAN Trunking Protocol (VTP)
Dynamic Trunking Protocol (DTP)
Understanding VLAN Port Assignment
Displaying Attribute Summaries
Interpreting Port Attributes Report
Interpreting Device Attributes Report
Usage Scenarios for Managing VLANs
Configuring PVLANs in External Demilitarized Zone
Managing VLANs and VTP
Campus Manager collects data about devices so that you can configure and manage Virtual LANs (VLANs) in your network. You must set up your LMS/Campus Manager server properly to ensure that Data Collection is successfully performed in your network.
The Campus Manager configuration module helps you to manage your VLANs. You can configure and manage VLANs, PVLANs, Trunk, and also assign ports to VLANs.
This chapter contains:
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Understanding Virtual LAN (VLAN)
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Understanding Virtual LAN (VLAN)
A Virtual Local Area Network (VLAN) allows you to create logical broadcast domains that can span across a single switch or multiple switches, regardless of physical positioning. A VLAN contains a group of devices on one or more LANs.
These devices are configured in such a way that they can communicate as if they were all on the same network segment. VLANs are based on logical connections instead of physical connections, and hence they are extremely flexible.
VLAN allows you to group ports on a switch to limit unicast, multicast, and broadcast traffic flooding. Flooded traffic originating from a particular VLAN is only flooded out to other ports belonging to that VLAN.
This helps to reduce the size of broadcast domains and it allows groups or users to be logically grouped without being physically located in the same place.
The following topics are covered in this section:
Advantages of VLANs
VLANs provide the following advantages:
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Simplification of Adds, Moves, and Changes
Adds, moves, and changes are some of the greatest expenses in managing a network. Many moves require re-cabling and almost all moves require new station addressing and hub and router re-configuration.
VLANs simplify adds, moves, and changes. VLAN users can share the same network address space regardless of their location.
If a group of VLAN users move but remain in the same VLAN connected to a switch port, their network addresses do not change.
If a user moves from one location to another but stays in the same VLAN, the router configuration does not need to be modified.
Controlled Broadcast Activity
Broadcast traffic occurs in every network. Broadcasts can seriously degrade network performance or even bring down an entire network, if the network is not properly managed.
Broadcast traffic in a particular VLAN is not transmitted outside that VLAN. This substantially reduces overall broadcast traffic, frees bandwidth for real user traffic, and lowers the vulnerability of the network to broadcast storms.
You can control the size of broadcast domains by regulating the size of their associated VLANs and by restricting both the number of switch ports in a VLAN and the number of people using the ports.
You can also assign VLANs based on the application type and the amount of application broadcasts. You can place users sharing a broadcast-intensive application in the same VLAN group and distribute the application across the network.
Workgroup and Network Security
You can use VLANs to provide security Firewalls, restrict individual user access, flag any unwanted network intrusion, and control the size and composition of the broadcast domain.
You can:
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VLAN Components
The VLAN components are:
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Switches are the entry point for end-station devices into the switched domain and provide the intelligence to group users, ports, or logical addresses into common communities of interest. LAN switches also increase performance and dedicated bandwidth across the network.
You can group ports and users into communities using a single switch or connected switches. By grouping ports and users across multiple switches, VLANs can span single-building infrastructures, interconnected buildings, or campus networks.
Each switch can make filtering and forwarding decisions by packet and communicate this information to other switches and routers within the network.
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Routers provide policy-based control, broadcast management, and route processing and distribution. They also provide the communication between VLANs and VLAN access to shared resources such as servers and hosts.
Routers connect to other parts of the network that are either logically segmented into subnets or require access to remote sites across wide area links.
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The VLAN transport enables information exchange between interconnected switches and routers on the corporate backbone. This backbone acts as the aggregation point for large volume of traffic.
It also carries end-user VLAN information and identification between switches, routers, and directly attached servers. Within the backbone, high-capacity links with high-bandwidth carry the traffic throughout the enterprise.
Using VLANs
You can use Campus Manager to create, modify, and delete VLANs. You can use the Topology Services to create Ethernet VLANs.
Campus Manager allows you to modify most of the VLAN characteristics that were entered when you created the VLAN, such as purpose, description, and LANE services.
The following sections brief on the types of VLANs supported by Topology Services:
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Configuring VLANs
You can configure VLANs using VLAN Configuration wizard.
Creating VLAN
To create VLANs, the VLAN Configuration wizard directs you through:
1.
5.
Deleting VLAN
To delete VLANs, the VLAN Configuration wizard directs you through:
2.
3.
Selecting Devices or Entities
You must select the devices or entities to be included in the VLAN. Domain Selector helps you to select devices in Switch Clouds and VTP Domains.
To select devices or entities for a VLAN:
Step 1
The VLAN Configuration page appears.
Step 2
Step 3
a.
The Create VLAN page appears.
b.
Or
a.
The Select VLAN to Delete page appears.
b.
Creating VLANs
After you select devices using the Device Selector or the Domain Selector and click Create in the VLAN Configuration page, the Create VLAN page appears. For more details, see Selecting Devices or Entities.
You must enter the details as described in the Table 10-2.
Table 10-2 Create VLAN Field Description
VLAN Name
Enter a name for the new VLAN.
VLAN Index
Enter a number between 1 and 1024 to identify the VLAN.
Create on all transparent switches
Check the checkbox to include all switches that are VTP transparent.
VTP transparent switches do not send VTP updates and do not act on VTP updates received from other switches.
This checkbox is available only for VTP domain based VLAN creation. For more details on this, see Creating VLANs on Transparent Devices
Copy running to start-up config
Check the checkbox to copy the running configuration to the start-up configuration.
Click any of the following:
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The Assign VLANs to Port page appears. For details, see Assigning Ports to VLANs.
Assigning ports to VLANs cannot be done for more than 100 devices at a time, since it results in memory issues. If you have selected more than 100 devices, click Finish to save VLAN creation. Do VLAN port assignment for 100 devices at a time.
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VLANs are created on the specified devices and the initial VLAN Configuration page appears.
Creating VLANs on Transparent Devices
When you create VLANS without checking the Create On All Transparent Switches option in the VLAN creation page, the following is the behaviour of Campus Manager:
When you create VLANS with the Create On All Transparent Switches option in the VLAN creation page, the following is the behaviour of Campus Manager:
In the above tables, VTPv2 refers to VTP version 2 and VTP v3 refers to VTP version 3.
Assigning Ports to VLANs
A VLAN created in a management domain remains unused until you assign one or more switch ports to the VLAN.
The Assign VLANs to Port page appears after you create the VLAN name and index.
To assign ports to VLANs:
Step 1
The VLAN Configuration page appears.
Step 2
Step 3
Step 4
The Assign Ports to VLAN page appears.
Step 5
Table 10-3 describes the entries in the Assign Ports to VLAN page.
Table 10-3 Assign Ports to VLAN Page Field Description
VLAN
Displays the name of the new VLAN.
Filter
Select any of the following criteria based on which you want to filter the list:
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Or enter * or leave the field blank and click Filter to get all the records.
Advanced Filter
Click Advanced Filter to open Advanced Filter dialog box. Advanced filtering allows you to search ports using more search criteria.
For more details on Advanced Filter, see Advanced Filter.
Column
Link
Shows whether the port is connected to a switch or not. The value can either be True or False.
Port
Name of the port.
Device Name
Name of the device to which the port belongs to.
Device Address
IP address of the device to which the port belongs to.
Port Status
Status of the port. Shows whether the port is active or down.
VLAN Index
Index number for the VLAN to which the port belongs to.
VLAN Name
Name of the VLAN to which the port belongs to.
Association Type
Type of VLAN association.
Step 6
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The Disallow VLAN on Trunks page appears.
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VLANs are created on the specified devices, selected ports are assigned to new VLAN and the initial VLAN Configuration page appears.
For more details, see Disallowing VLAN on Trunks.
Advanced Filter
The Advanced Filter allows you to filter and choose the ports using various parameters and criteria, for assigning the ports to the VLAN. Table 10-4 describes the fields in the Filter Ports Window, when you click Advanced Filter from the Assign Ports to VLAN Window.
Click any of the following:
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You can add or remove only one filter at a time.
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Disallowing VLAN on Trunks
You can select the links on which you do not want to allow Trunking in the newly created VLAN. After you Assign the ports to the VLAN (See Assigning Ports to VLANs), the End-to end VLAN wizard directs you to Disallow VLAN on Trunks page.
To disallow trunking on the links in your VLAN, check the checkboxes corresponding to those links, and click Next. The VLAN Creation Summary page appears.
Clicking Back takes you to the Assign Ports to VLAN page, where you can modify the port assignment.
Clicking Finish saves the changes and takes you to the initial VLAN Configuration page.
For more details, see Understanding VLAN Creation Summary.
Table 10-5 describes the fields in the Disallow VLAN on Trunks page.
Understanding VLAN Creation Summary
The VLAN Creation Summary page summarizes the operations that you performed through the VLAN Configuration wizard. The Summary provides the following information:
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Example:
VLAN Creation ParametersVLAN Name: TestVLAN Index: 912Create on all transparent switches : trueCopy running-config to startup-config : true-----------------------------------------VLAN Port Assignment ParametersVLAN Name: TestVLAN Index: 912Operation: Assign the VLAN to selected port(s)Port : Fa4/28Device: 10.77.209.43Device Address: 10.77.209.43------------------------------------------VLAN Trunk Configuration ParametersVLAN Name: TestVLAN Index: 912Operation: Disallow VLAN on selected Trunk(s)Trunk: 10.77.209.52:2/1 => 10.77.209.61:2/25Trunk: 10.77.210.211#2:Gi0/2 => 10.77.210.204:Gi1/0/24Review the Summary, and click Finish to create the new VLAN, or click Back to modify the Disallow VLAN on Trunks page, or click Cancel to exit.
Deleting VLANs
You can delete the VLANs configured on the devices in your network. The VLAN Configuration wizard directs you to delete a VLAN.
Step 1
The VLAN Configuration page appears.
Step 2
For more details on selecting the devices, see Selecting Devices or Entities.
Step 3
The Select VLAN to Delete page appears.
Table 10-6 describes the fields in the Select a VLAN to Delete dialog box.
Step 4
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The Move Affected Ports to New VLAN page appears. For more details, see Moving Affected Ports to New VLAN.
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The VLAN configuration appears.
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The selected VLANs are deleted from the devices. The ports in the deleted VLAN are automatically assigned to the default VLAN. The VLAN configuration page appears.
Moving Affected Ports to New VLAN
When you delete a VLAN, any port assigned to that VLAN becomes inactive. Such ports remain associated with the VLAN (and thus inactive), until you assign them to a new VLAN. You can move affected ports to a new VLAN using Campus Manager.
You can move the ports in the VLAN you want to delete, to a new VLAN, only after you select the VLAN you want to delete. For more details on selecting a VLAN to delete, see Deleting VLANs.
To move affected ports to a new VLAN:
Step 1
The VLAN Configuration page appears.
Step 2
For more details on selecting the devices, see Selecting Devices or Entities.
Step 3
The Select VLAN to Delete page appears.
Step 4
The Move Affected Ports to New VLAN appears.
Table 10-7 describes the fields in the Move Affected Ports to new VLAN page.
Step 5
If you do not select any VLAN, the affected ports are moved to the default VLAN—VLAN 1.
Step 6
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The VLAN Deletion Summary page appears. For more details, see Understanding VLAN Deletion Summary.
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The VLAN configuration appears.
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The selected VLANs are deleted from the devices. The ports in the deleted VLAN are assigned to the VLANs selected by you. The VLAN configuration appears.
Understanding VLAN Deletion Summary
The VLAN Deletion Summary page summarizes the operations that you performed through the VLAN Configuration wizard to delete the VLAN. The Summary provides the following information:
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Example:
VLAN Deletion:===================VLAN Domain :DMZ_10.77.209.43(T)VLAN Deleted :VLAN0002VLANId : 2------------------------------------------Operation: Move the affected Ports to another VLANNew VLAN Name :internal VLAN 4New VLAN Id :4Port:Gi1/6Device :172.20.118.182Device Address :172.20.118.182-------------------------------------------Review the Summary and click Finish to delete the VLAN, or click Back to modify the Select VLAN to Delete page, or click Cancel to exit.
Creating Ethernet VLANs
You can use Topology Services to create Ethernet VLANs (which is the typical VLAN design). For details, see Ethernet VLANs.
Ethernet VLANs
An Ethernet VLAN is the typical VLAN design. This consists of a logical group of end-stations, independent of physical location on an Ethernet network. Catalyst switches support a port-centric or static VLAN configuration.
All end stations that are connected to ports Ethernet VLANs belonging to the same VLAN, are assigned to the same Ethernet VLAN.
Creating Ethernet VLANs
Before you create Ethernet VLANs, you must create a VTP domain in your network.
Your login determines whether you can use this option.
To create Ethernet VLANs in your network:
Step 1
The Topology Services Main Window appears.
Step 2
Step 3
The VLAN Creation wizard appears. For more details, see Creating VLANs
Interpreting VLAN Summary Information
To display summary information about the VLANs in your network:
From Tree View in Topology Services, open a VTP domain and select a VLAN. The Summary information is displayed in the right pane of the Topology services window. See Table 10-8 to interpret this information.
Note
Displaying VLAN Reports
Campus Manager allows you to generate VLAN reports for devices, switch clouds, or VTP domains.
Step 1
The Report Generator page appears.
The left drop-down list displays Campus Manager Reports.
Step 2
The VLAN page appears with the following information. See Table 10-9:
Step 3
Or
Click Reset to change the settings.
You can open VLAN reports page from Topology Services.
To open VLAN reports from Topology Services:
Step 1
The Topology Services Main Window appears.
Step 2
This view is in the Tree View in the Topology Services Main Window.
Step 3
or
Right-click the VTP Domain or the device, and select Display View.
The Network Topology window appears.
Step 4
Step 5
or
Select Reports > VLAN Report.
The VLAN Report window appears.
Interpreting VLAN Reports
The following information is displayed at the top of the report:
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Table 10-10 describes the fields in VLAN Report.
Understanding Private VLAN
A Private VLAN (PVLAN) is a VLAN that isolates devices at Layer 2 (L2), from other ports within the same broadcast domain or subnet. PVLAN segregates traffic at L2 and converts a broadcast segment into a non-broadcast multi-access segment.
PVLANs can stop L2 connectivity between end stations on a switch without distributing them into different IP subnets, thus preventing wastage of IP addresses.
You can also assign a specific set of ports within a PVLAN, and thus control the connectivity among them. You can configure PVLANs and normal VLANs on the same switch.
This topic contains:
Types of Private VLAN Ports
The ports in a private VLAN are categorized as:
Promiscuous Ports
Promiscuous port communicates with all other interfaces and ports within a PVLAN. Such ports are used to communicate with external routers, local directories, network management devices, backup servers, administrative workstations, etc.
Ports to the routing module in some switches are promiscuous in nature (for example, MSFC).
PVLAN Host Ports
A PVLAN host port is a port connected to a server or an end host that requires Layer 2 (L2) isolation. A host port exists in the PortFast mode and the BPDU Guard feature is enabled on these ports. These ports can be further classified into:
This depends on the secondary VLAN to which the ports belong.
Isolated Ports
Isolated ports are completely isolated in L2, from other ports in the same PVLAN. These ports cannot receive the broadcasts from other ports within the same PVLAN, but receive broadcasts from promiscuous ports.
Privacy for the VLAN is ensured at L2 level by blocking the traffic to all isolated ports, except the promiscuous ports. Broadcasts from an isolated port is always forwarded to all promiscuous ports.
Community Ports
Community ports communicate among themselves and with their promiscuous ports. These ports are isolated at L2 from all other ports in other communities, or isolated ports within their private VLAN. Broadcasts propagate only between associated community ports and the promiscuous port.
PVLAN Trunk Ports
Private VLAN Trunk ports are similar to Host ports that can carry multiple VLANs. A Trunk port carries the primary VLAN and the secondary VLANs to the neighboring switch. The Trunk port is unaware of PVLAN and will carry PVLAN traffic without any special action.
Using Private VLAN
A Private VLAN has four distinct parts:
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Manages the incoming traffic from the promiscuous port to isolated, community, two-way community ports, and all other promiscuous ports, in the same primary VLAN.
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Isolated ports use this VLAN to communicate to the promiscuous ports. The traffic from an isolated port is blocked from reaching all adjacent ports within its private VLAN, except for its promiscuous ports.
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A group of community ports use this unidirectional VLAN to communicate among themselves and to manage the outgoing traffic through the designated promiscuous ports from the private VLAN.
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A group of community ports use this VLAN to communicate among themselves. This bidirectional VLAN manages the incoming and outgoing traffic for community ports and Multilayer Switch Feature Cards (MSFC).
Isolated and community VLANs are called secondary VLANs.
While creating private VLANs, you:
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Campus Manager enables you to:
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Creating PVLAN
To create a Private VLAN, you must designate one VLAN as primary and another as either isolated, community, or two-way community VLAN. Then, you can assign additional VLANs as secondary VLANs.
After creating primary and secondary VLANs you must associate the secondary VLANs to the respective primary VLANs.
Creating a private VLAN involves the following steps:
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Creating Primary VLAN
You must create primary VLAN before creating any other secondary VLAN.
To create Primary VLANs:
Step 1
The PVLAN Configuration page appears.
Step 2
Or
Select Campus Manager > Visualization > Topology Services from the LMS Portal.
The Topology Services Main Window appears.
Step 3
Step 4
The Create PVLAN page appears.
Step 5
For more details, see Step 2 of Selecting Devices or Entities.
Step 6
The Get Primary VLANs tab and the Associated Primary VLAN field is disabled.
Step 7
Step 8
Step 9
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The check box for creating private VLANs on all transparent switches, is enabled only when the VLAN contains a device in transparent mode.
Step 10
Note
Creating Secondary VLAN and Associating to Primary VLAN
After creating a primary VLAN, you can create secondary VLANs. Once you create a secondary VLAN, you must associate that to a primary VLAN.
To do this:
Step 1
The PVLAN Configuration page appears.
Or
Select Campus Manager > Visualization > Topology Services from the LMS Portal.
The Topology Services Main Window appears.
Step 2
This view is in the Tree View in the Topology Services Main Window.
Step 3
The Create PVLAN page appears.
Step 4
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Step 5
You can associate a secondary VLAN that you have created to a primary VLAN.
VTP Domain field displays the domain you have chosen.
You may enter the Private VLAN Name that you want to assign.
Step 6
Step 7
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The check box for creating private VLANs on all transparent switches, is enabled only when the VLAN contains a device in transparent mode.
Step 8
Associating Ports to Secondary VLAN
You must associate ports to the secondary VLAN that you have created. You can assign ports to a secondary VLAN as you assign for normal VLANs. For assigning ports to VLANs, see Using VLAN Port Assignment
Configuring Promiscuous Ports
You must associate the promiscuous ports to the PVLANs you have created, to receive traffic from outside the PVLAN.
You can configure only the ports on which Trunking is not enabled.
To configure a Promiscuous Port:
Step 1
The PVLAN Configuration page appears.
Or
From Topology Services Main Window, select the device that has the ports you require and select Tools > VLAN Port Assignment.
The VLAN Port Assignment window appears.
Step 2
The Configure Promiscuous Ports page appears.
Step 3
Step 4
The Port List displays the list of ports on the selected devices.
You can filter the list using the Filter or Advanced Filter.
Step 5
Step 6
The Configure Promiscuous Port window appears.
The Port Details table displays:
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Step 7
Step 8
Or
Click Remove to remove the VLANs from the Map VLANs table.
You can select the Copy Running to Start-up config check-box to copy the running configuration to the start-up configuration.
Step 9
Deleting PVLAN
To delete PVLAN:
Step 1
Step 2
Or
From Topology Services, select Managed Domains > VTP Domains from the Tree View in the Topology Services Main Window.
Step 3
Step 4
A VTP Domain Name: Delete Private VLAN Name appears.
Step 5
Step 6
To select all, select the check-box in the table heading.
Step 7
Understanding Inter-VLAN Routing
Inter-VLAN Routing enables to route the traffic between different VLANs. This feature is required when an end station wants to communicate with another end station in a different VLAN. Devices within a VLAN can communicate with one another without the help of a router.
On the contrary, devices in separate VLANs require a routing device to communicate with one another. Network devices in different VLANs cannot communicate with one another without a router to route the traffic between the VLANs.
In most of the network environments, VLANs will be associated with individual networks or subnetworks. In a switched network, VLANs segregate devices into different collision domains and Layer 3 (L3) subnets.
Configuring VLANs for inter-VLAN routing helps to control the size of the broadcast domain and to keep local traffic local. You can configure one or more routers to route traffic in the network.
Layer 2 switches require a L3 routing device (either external to the switch or in another module on the same chassis).
The new L3 Switches accommodate routing capabilities. The router or the switch receives a packet, determines the VLAN to which it belongs, and sends the packet to the appropriate port on the other VLAN.
Using Inter-VLAN Routing
Configuring Inter-VLAN Routing
Campus Manager supports Inter-VLAN Routing configuration on devices like MSFC, RSM, and external routers with IPv4.
Prerequisite for configuring Inter-VLAN Routing through Campus Manager
Resource Manager Essentials is a prerequisite for configuring Inter-VLAN Routing using Campus Manager. If the server running Campus Manager does not have RME, you can use a remote server, which has the RME application.
If you want to configure Inter-VLAN Routing on a device:
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See the User Guide for Resource Manager Essentials 4.1 for more details on how to manage devices.
Configuring Inter-VLAN Routing on RSM, MSFC, L2/L3 Devices
To configure Inter-VLAN Routing on a VLAN interface:
Step 1
The Topology Services Main Window appears.
Step 2
Step 3
The Configure Inter-VLAN Routing window appears. This window displays the Device Name and the Device IP of the selected device.
Step 4
Step 5
Or
Click New to configure Inter-VLAN Routing for a new VLAN interface.
You can edit IP Address, Admin Status, and Subnet Mask. See Table 10-12.
Table 10-12 Configuring Inter-VLAN Routing Field Descriptions
VLAN Interface1
Enter the VLAN interface.
IP Address
Enter the IP address for the interface
Subnet Mask
Enter the subnet mask address.
Admin Status
Select the Admin status:
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1 You can enter the VLAN interface name to create a new interface. You cannot edit an existing VLAN interface.
You can also delete a Device Interface from the list of Interfaces for which you do not want to configure Inter-VLAN Routing.
Step 6
If you want to edit the configuration details again:
a.
b.
c.
Step 7
You can configure Inter-VLAN Routing for more than one VLAN interface, at a time.
The RME Server credentials window appears.
Step 8
Table 10-13 RME Server credentials Field Description
RME Server
Name of the RME server or the IP address
Server Port1
Enter the port number
User Name
Enter the user name
Password
Enter the password
1 In Campus Manager, 1741 is the default port for http mode and 443 is the default port for SSL (https) mode.
Step 9
Inter-VLAN Routing is configured for all the VLAN interfaces in Interface Set.
Configuring Inter-VLAN Routing on External Routers
To configure Inter-VLAN Routing on a VLAN interface of an external router:
Step 1
The Topology Services Main Window appears.
Step 2
Step 3
The RME Server credentials window appears.
Step 4
Table 10-14 RME Server Credentials Field Description
RME Server
Name of the RME server or the IP address.
Server Port1
Enter the port number.
User Name
Enter the user name.
Password
Enter the password.
1 In Campus Manager 1741 is the default port for http mode and 443 is the default port for SSL (https) mode.
Step 5
The Configure Inter-VLAN Routing window appears.
Step 6
Step 7
Or
Click New to configure Inter-VLAN Routing for a new VLAN interface.
You can edit IP Address, Admin Status, Encapsulation, and Subnet Mask. See Table 10-15
Table 10-15 Configuring Inter-VLAN Routing Field Descriptions
VLAN Interface1
Enter the VLAN interface.
IP Address
Enter the IP address for the interface.
Sub-Interface ID
Enter the ID for the sub-interface.
Admin Status
Select the Admin status:
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Encapsulation
Select the encapsulation:
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Subnet Mask
Enter the subnet mask address.
1 You can enter the VLAN interface name to create a new interface. You cannot edit an existing VLAN interface.
You can also delete a device interface from the list of interfaces for which you do not want to configure Inter-VLAN Routing.
Step 8
If you want to edit the configuration details again:
a.
b.
c.
Step 9
You can configure Inter-VLAN Routing for more than one VLAN interface, at a time.
Inter-VLAN Routing is configured for all VLAN interfaces in the Interface Set.
VLAN Trunking Protocol
VLAN Trunking Protocol (VTP) is a Layer 2 multicast messaging protocol that maps VLANs across all media types and VLAN tagging methods between switches. In this way it maintains the VLAN configuration consistency throughout a network.
VTP reduces the effort in adding, deleting, or renaming a VLAN at each switch, when the VLAN extends to other switches in the network.
VTP minimizes misconfigurations and configuration inconsistencies that can result in a number of problems, such as duplicate VLAN names, incorrect VLAN-type specifications, and security violations.
With VTP, you can make configuration changes centrally on one switch and have those changes automatically communicated to all the other switches in the network.
The major function of VTP is to distribute VLAN information. You must configure VTP before you configure any VLAN.
Using VTP, each switch in server mode displays the following:
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For more details on VLAN, see Understanding Virtual LAN (VLAN), and for VTP Domains, seeVTP Domains.
This topic contains:
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VTP Domains
A VTP domain is made up of one or more interconnected devices that share the same VTP domain name. A switch can be configured to be in only one VTP domain, and each VLAN has a name that is unique within a management domain.
Typically, you use a VTP domain to ease administrative control of your network or to account for physical boundaries within your network. However, you can set up as many or as few VTP domains as are appropriate for your administrative needs.
Consider that VTP is transmitted on all Trunk connections, including ISL, IEEE 802.1Q, 802.10, and LANE.
VTP Domains display and monitor the details of the VLANs in your network. Sometimes includes special cases labeled NULL or NO_VTP.
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However, devices which do not support VTP but support VLANs (for example, Catalyst 2900XL Standard Edition switches) are placed in the NO_VTP domain.
The devices that do not support VLANs and VTP (for example, Catalyst 1900 Standard Edition switches) are placed in the domain category of the neighbor device.
Components of VTP Domains
Within a VTP domain, you can configure switches as follows:
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Your VTP domain structure influences the behavior of Topology Services.
Understanding VLAN Trunking Protocol Version 3
VTP version 3 can distribute a list of opaque databases over an administrative domain.
VTP version 3 provides these enhancements to the previous VTP versions:
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VTP version 3 is a collection of protocol instances. Each instance handles one database, which is associated with a given feature. VTP version 3 runs multiple instances of the protocol by which it handles the configuration propagation of multiple databases that are independent of one another.
Support for VTP Version 3 in Campus Manager
Campus Manager supports the version 3 of VTP. Following are the major features supported in this release:
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If your network contains devices running VTP version 3, the primary server is displayed as a subfolder under the parent Domain in the VTP Domains. Under Primary server folder, you can find all the server and client modes.
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The devices which are set to Off mode are supported as for the transparent mode devices. The Tree View displays the Off mode devices in subfolder under the parent domain.
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Topology Filters contains a filter for devices running VTP version 3 in the Network Topology view for the VTP Domains and VTP Views.
You can enable the filters to view the primary, server, client, transparent, and Off mode devices. The Off mode devices in VTP version 2 and version 3 domains, are displayed under different subfolders of the parent domain, in the Tree View.
When you change the configuration through Campus Manager, the Off mode devices are considered similar to the Transparent mode devices.
For more details, see Figure 10-1.
Figure 10-1 VTP Filters
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You can create a VLAN or PVLAN using a primary server domain or the parent domain. You can create a VLAN or PVLAN only on the Primary server, Transparent and Off mode devices, in a VTP version 3 environment.
Notes on creating VLAN or PVLAN in VTP version 3 domain using Campus Manager
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For more details, see Creating Ethernet VLANs and Creating PVLAN.
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Using VLAN Trunking Protocol (VTP)
Using VLAN Trunking Protocol (VTP), each switch in server mode advertises its management domain on its Trunk ports, its configuration revision number, and its known VLANs and their specific parameters.
Therefore, a new VLAN must be configured on only one device in the management domain, and the information is automatically learned by all other devices (not in VTP transparent mode) in the same management domain.
After a device learns about a VLAN, it receives all frames on that VLAN from any Trunk port and, if appropriate, forwards them to each of its other Trunk ports.
This topic contains:
Displaying VTP Reports
To display a VTP report for the VTP domains in your network.
Step 1
The Topology Services Main Window appears.
Step 2
The VTP Report, which is the Summary view, appears.
Interpreting VTP Reports
See Table 10-16 to interpret the fields shown in the VT Reports Summary view.
Using VTP Views
VTP Views shows devices that participate in VTP domains. VTP Views also shows the non-VTP devices connected directly to the VTP domain. See Figure 10-2
Figure 10-2 VTP Tree View
Use the VTP views to:
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Understanding Trunking
A Trunk is a point-to-point link carrying traffic for several VLANs, and are typically used to connect switches. Instead of configuring several access links to carry multi-VLAN traffic, its economical to do it with a single trunk link.
Trunking is hence a type of configuration on an interface which allows VLANs to span the entire network, instead of just one switch. The Trunked interface that connects to another network device is allowed to pass traffic for multiple VLANs, instead of only one VLAN as in a non-Trunked interface on a switch.
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Trunking Considerations
While using a Trunk, consider the following:
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Dynamic Trunking Protocol (DTP)
Dynamic Trunking Protocol (DTP) is a Cisco proprietary protocol. Trunk negotiation is managed by the DTP on a link between two devices. DTP is also used for negotiating the type of Trunking encapsulation to be used.
Dynamic Trunking is the ability to negotiate the Trunking method with the other device, and DTP is a point-to-point protocol that supports auto-negotiation of both ISL and 802.1Q Trunks. DTP sends the VTP domain name in a DTP packet.
Therefore, if you use DTP, and if the two ends of a link belong to a different VTP domain, the Trunk will not function.
The Catalyst operating system options of auto, desirable, and on, and the IOS options of dynamic auto, dynamic desirable, and trunk, configure a Trunk link using DTP. If one side of the link is configured to Trunk and sends DTP signals, the other side of the link will dynamically begin to Trunk, if the options match correctly.
To enable Trunking and not send any DTP signaling, you can use the option nonegotiate for switches that support that function. If you want to disable Trunking completely, you can use the off option for a Catalyst operating system switch or the no switchport mode trunk command on an IOS switch.
DTP is a second generation Dynamic Inter-Switch Link Protocol (DISL) and allows the Cisco Catalyst devices to negotiate whether to use 802.1Q encapsulation. DISL and DTP do not negotiate Trunking in case of EtherChannel—they only negotiate whether to enable Trunking.
Trunk Encapsulation
The following Trunking encapsulations are available on all Ethernet interfaces:
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Trunk Characteristics
Table 10-17 shows the DTP signaling and the characteristics of each mode.
Encapsulation Types
The encapsulation type allows you to specify whether ISL or 802.1q should be used for Trunking. The parameter is only relevant if the module you are using is able to use both types of encapsulation. The parameter can have three different values as shown in table below.
Creating Trunk
To create trunk for a port:
Step 1
The Create Trunk page appears.
Step 2
The Available Links pane displays the links for each device that you have selected. Table 10-18 describes the fields in the Available Links pane.
Step 3
Step 4
Or
From Topology Map, right-click the link for which you want to create trunk, and select Create Trunk from the popup menu.
The Create Trunk window appears.
Table 10-19 describes the fields in the Create Trunk page.
To copy the running configuration to start-up configuration, select Copy Running to Start-up Config check-box .
Step 5
After you click Create, it will be idle for 2 minutes to see if the device goes down on setting the port to trunking mode. After 2 minutes, if the creation of trunk is successful, Data Collection for these devices is triggered.
Only after the completion of Data Collection, you can see the newly configured trunk ports in the Modify Trunk Attributes page.
Note
To know whether the port is trunking or not, enable logging in the device and see the log messages.
Modifying Trunk Attributes
To modify trunk attributes:
Step 1
Step 2
The Modify Trunk Attributes page appears.
Step 3
The trunks configured on the devices are listed in the Trunk List. See Table 10-20.
Step 4
The Modify Trunk window appears.
The Device Information pane displays the device IP address and the port number of all the devices you have selected.
Step 5
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Campus Manager 3.3 supports only the Desirable mode.
Step 6
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Use the Add or Remove buttons to allow or disallow VLANs.
To copy the running configuration to start-up configuration, select Copy Running to Start-up Config check-box.
Step 7
EtherChannel
EtherChannel is a technology that bundles individual Fast Ethernet and Gigabit Ethernet links into a single logical link that would provide higher bandwidth. EtherChannels thus enable you to aggregate up to Gigabit Ethernet connections, providing up to 16 Gbps of bandwidth (in full duplex mode).
The channel is treated as a single logical connection between two switches. If one of the connections fails in the EtherChannel, the other connections will be operating so that the connection is not down.
This topic contains:
Understanding EtherChannel
EtherChannel provides incremental Trunk speeds between Fast Ethernet (FE) and Gigabit Ethernet (GE) by grouping multiple equal-speed ports into a logical port channel. EtherChannel combines multiple FEs up to 800 Mbps or GEs up to 8 Gbps, providing fault-tolerant, high-speed links between switches, routers, and servers.
Campus Manager supports only PAgP, the aggregation protocol. When a user selects a port or link for configuring EtherChannel, the user is prompted with all available ports that can participate in the channel (Ports that are directly connected between devices).
Admin Group ID attribute for each port is also provided under group attribute. User can change them accordingly to choose which ports need to aggregate into a channel.
All ports that have same group value will participate in channel. Campus Manager supports only the Desirable mode for EtherChannel configuration.
Campus Manager does not support EtherChannel configuration between a switch and router.
Using EtherChannel
Campus Manager allows you to:
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Configuring EtherChannel
To configure EtherChannel:
Step 1
The Topology Services Main Window appears.
Step 2
This view is in the Tree View in the Topology Services Main Window.
Step 3
The Network Topology View window appears.
Step 4
Step 5
The EtherChannel Configuration window appears.
Protocol field displays PAgP. Port Aggregation Protocol (PAgP) is the Protocol that is supported for configuring EtherChannel.
Step 6
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Select leave default when you do not want to configure distribution protocols.
The Channel Mode field displays the mode of the port.
Campus Manager supports only the Desirable mode for EtherChannel configuration.
Step 7
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Select leave default when you do not want to configure distribution address type.
Step 8
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Step 10
VLAN Port Assignment
VLAN Port Assignment is an application that displays device, port, and related VLAN information for an associated VTP domain in a tabular format and helps you manage ports on your network's VLANs.
Use VLAN Port Assignment to:
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Note
This topic contains the following sections:
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Prior to using VLAN Port Assignment, you should understand the concepts of VLANs and VTP domains. For more details on this, see:
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Understanding VLAN Port Assignment
To enable end-user ports to participate in a specific VLAN, you must first assign the ports. You assign ports to specified VLANs. The VLANs allow the ports to share the same broadcasts.
Ports that are not assigned to the VLAN cannot share these broadcasts. For more information about VLANs, see Understanding Virtual LAN (VLAN).
For VLAN Port Assignment to work correctly, Campus Server must discover the network. Campus Server requires a properly configured network to complete network discovery.
For information on the various settings, see Viewing Campus Manager Home Page.
VLAN Port Assignment queries the ANI database based on criteria you enter.
After you submit the query, VLAN Port Assignment displays the device, port, and related VLAN information for an associated VTP domain. This is displayed in a tabular format.
You can use VLAN Port Assignment to:
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Starting VLAN Port Assignment
To start VLAN Port Assignment:
Step 1
Step 2
See Analyzing ANI Server for more details.
Step 3
Or
Select Topology Services > Tools > VLAN Port Assignment.
If you are prompted to install the Java plug-in, you can download and install the plug-in using the displayed installation screens. The next time you start the application, it will automatically use the plug-in.
Using VLAN Port Assignment
To assign ports to a VLAN:
Step 1
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Select Topology Services > Tools > VLAN Port Assignment.
The VLAN Port Assignment page appears.
Step 2
Step 3
A list of ports in the selected devices or entities appears under the Port List. See Table 10-21 for the Port List :
Table 10-21 Port List Field Description
Filter
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Enter the filter string, and click Filter to filter the list based on the inputs. Leave this field blank to list all ports.
Advanced Filter
Click Advanced Filter to open Advanced Filter dialog box. Advanced filtering allows you to search ports using more search criteria.
For more details on Advanced Filter, see Advanced Filter.
Columns
Link
Shows whether the port is connected to a switch or not. The value can either be True or False.
Port
Name of the port.
Device Name
Name of the device to which the port belongs to.
Device Address
IP address of the device to which the port belongs to.
VLAN Name
Name of the VLAN to which the port belongs to.
Port Status
Status of the port. Shows whether the port is active or down.
Port Description
Description for the port.
Example: Intra-area 0.2.0.0 Resilient link
VLAN Index
Index number of the VLAN to which the port belongs to.
Association Type
Type of Association.
Step 4
To copy the running configuration to the start-up configuration, select Copy running to start-up config check-box.
Step 5
Configuring Trunk Attributes
Your login determines whether you can use this option. You must have either Network Administrator or System Administrator privileges.
To configure Trunk Attributes:
Step 1
Or
From Topology Services Main Window, right-click a trunk link from a network view and select VLAN Port Assignment from the popup menu.
Step 2
Step 3
Step 4
To interpret this information, see Table 10-24.
Step 5
The range of ISL indexes from one to 4096 is applicable only if the device supports 4096 VLANs.
Step 6
If you enter numbers into both fields, the ISL indexes that you are disallowing will take precedence over ISL indexes that you are allowing. For example, if you allow 1-1024 and disallow 1-100, VLANs with ISL indexes of 101-1024 will be allowed.
Step 7
Displaying Attribute Summaries
The following topics describe how to view status information about ports, devices, and trunks in your network:
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Displaying Port Attributes
To display information about the status of the ports in your network:
Step 1
The Reports Generator page appears.
Step 2
Step 3
The Port Attributes page appears.
Step 4
Step 5
The default scheduling type is Immediate.
You can set the time and date if you select any of the following scheduling types: Once, Daily, Weekly, Monthly.
Enter a description for your job in the Job Description field and enter the e-mail address to which the details has to be sent.
Note
Step 6
For more information on Port Attributes, see Interpreting Port Attributes Report.
Interpreting Port Attributes Report
To view the Port Attributes report for a device, select the device from the Go To: list. The Go To: list contains the device name and device IP address.
Alternatively, you can scroll the page to view the report for the selected devices.
The Port Attributes report contains the following information for a device:
You can export or print the report.
To export the report to a Common Services server, click the export button at the top right of the page.
To print the page, click the printer icon on the top right of the page.
Displaying Device Attributes
To display information about a specific device.
Step 1
The Reports Generator page appears.
Step 2
Step 3
The Device Attributes page appears.
Step 4
Step 5
The default scheduling type is Immediate.
You can set the time and date if you select any of the following scheduling types: Once, Daily, Weekly, Monthly.
Step 6
Step 7
For more information on Device Attributes, see Interpreting Device Attributes Report.
Interpreting Device Attributes Report
To view the device attributes report for a device, select the device from the Go To: list. The Go To: list contains the device name, device IP address, and the device type.
Report for each device is displayed in a table with the Device Name, Device IP Address, and Device Type as the table heading.
Alternatively, you can scroll the page to view the report for the selected devices.
The device attributes report contains the following information for a device:
Displaying Trunk Attributes
To display information about the status of the trunking ports in your network.
Step 1
The Trunk Configuration page appears.
Step 2
Step 3
Step 4
A list of trunks appears.
Step 5
Step 6
The Modify Trunk Attributes window appears with the trunk attributes.
For more information on Trunk Attributes, see Interpreting Trunk Attributes.
Interpreting Trunk Attributes
See Table 10-24 for details about the fields shown in the Trunk Attributes window.
Troubleshooting Suggestions
Use the information in the Troubleshooting VLAN Port Assignment Table 4-3 to troubleshoot the VLAN Port Assignment application.
Usage Scenarios for Managing VLANs
You can use the following scenarios to manage your network using Campus Manager.
Configuring PVLANs in External Demilitarized Zone
Scenario
Web servers and Domain Name Servers (DNS) are connected to a Demilitarized Zone (DMZ) switch. The DMZ switch is configured with the VTP domain name, DMZ, where the switch is in transparent mode running VTP version 2. The servers belong to the same broadcast domain or VLAN.
Understanding the Scenario
This scenario would help you to isolate Layer 2 devices using PVLAN, and ensure that the DMZ servers do not send data across them, while internal and external hosts access these servers.
DMZ servers must be accessible from external clients as well as from the internal network. DMZ servers eventually needs access to some internal resources, and the servers must not send data across. The servers must not initiate traffic from the DMZ switch to the Internet. The DMZ servers reply only to the traffic from the internal resources.
Understanding Concepts
Campus Manager provides an end-to end solution for configuring Private VLANs, the security feature which Campus Manager provides for managing LANs. You can configure PVLANs using Campus Manager.
You can configure PVLANs in scenarios where Demilitarized Zone (DMZ) switches are configured without adhering to the right policies, leading to potential intrusions into your network.
Demilitarized Zone
Demilitarized Zone is a small subnetwork, which lies between a secure internal network, such as a corporate private LAN, and a non secure external network, such as the public Internet. DMZ contains devices like Web servers, FTP servers, SMTP servers and DNS that are accessible to the Internet traffic.
DMZ servers process incoming requests from the Internet, and initiate connections to certain internal servers or other DMZ segments, such as database servers.
DMZ servers must not send data or initiate any connection to the external networks. This shows that the necessary traffic flows on the basis of a trust model; but the model is not adequately enforced in many networks.
Prerequisites
In this scenario, you need the following applications and tools in Campus Manager.
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Reproducing Scenario
To set up the scenario you must configure secondary VLAN on the servers, with isolated ports and community ports. The Firewall, the only device within the primary VLAN, must be defined in a primary VLAN with a promiscuous port.
Step 1
Enter VLAN 100 in the Private VLAN Name field to name the primary VLAN. For more details on creating primary VLAN, see Creating Primary VLAN.
Step 2
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For more details on creating secondary VLAN, see Creating Secondary VLAN and Associating to Primary VLAN.
Step 3
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For more details on creating secondary VLAN, see Creating Secondary VLAN and Associating to Primary VLAN.
Step 4
Step 5
Step 6
After you configure the promiscuous port, the secondary VLANs appear in the Mapped VLANs table.
You have configured promiscuous port and mapped both secondary VLANs to the primary VLAN 100.
If you want to map only the community VLAN 60, you must check the configurations, and map the other isolated VLANs.
Check the Select to Unmap check box and click Apply to unmap the isolated VLAN from primary VLAN. Community VLAN 60 is unmapped from the primary VLAN.
Verifying Configuration
To verify the configuration for this scenario:
Step 1
The Topology Services Main Window appears.
Step 2
Primary VLAN 100 is listed as a subfolder under the DMZ domain and the secondary VLAN under the Primary VLAN subfolder. Note that the icon for PVLANs is different from the icon for normal VLANs.
Step 3
Step 4
Step 5
Step 6
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