Cisco CNS Network Registrar Users's Guide Web Interface, 6.0
Address Block Administration
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Address Block Administration

Table Of Contents

Address Block Administration

Address Block Administrator Role

Role Functions

Role Limitations

Viewing the Unified Address Space

Managing Address Blocks

Listing and Adding Address Blocks

Editing or Adding Children to an Address Block

Managing Subnets

Adding Static Subnets

Editing or Adding Address Ranges to a Subnet

Managing Owners

Managing Regions

Viewing Data Consistency

Adding Data Consistency Rules

Viewing the Consistency Results


Address Block Administration


Address blocks provide an organizational structure for addresses used across the network. Address blocks can consist of static addresses or dynamic addresses allocated to DHCP servers for lease assignment. An address block can have any number of child address blocks and can culminate in one or more child subnets. The address block administrator is responsible for these objects. This administrator can create parent and child address blocks or subnets, which are always the leaf nodes of the address space. Static subnets can be further subdivided into one or more IP address ranges. However, dynamically added subnets create their own subnets that the administrator cannot modify or delete.

Table 6-1 lists the topics explained in this chapter.

Table 6-1 Address Block Administration Topics

If you want to learn about...
See...

Address block administrator responsibilities

"Address Block Administrator Role" section

Viewing the unified address space

"Viewing the Unified Address Space" section

Managing address blocks

"Managing Address Blocks" section

Managing subnets

"Managing Subnets" section

Managing owners

"Managing Owners" section

Managing regions

"Managing Regions" section

Managing consistency rules

"Viewing Data Consistency" section


Address Block Administrator Role

The address block administrator role manages address space at a higher level than that of specific subnet or static address allocations. This is actually a middle manager role, as there is likely to be a higher authority handing out address blocks to the system.

Role Functions

These functions are available to the address block administrator:

View, add, edit, and delete address blocks, subnets, owners and regions

Check the data consistency

Role Limitations

There are no address space limitations to this role.

Viewing the Unified Address Space

You can view the static and dynamic address space on the View Unified Address Space page (see Figure 6-1). This address space is a hierarchical tree of address blocks and subnets, sorted in IP address order. You can select the level of depth to display the tree. You can also expand and contract nodes, which recursively expands or contracts all child nodes. If you pick a new level, this overrides the previous expansion or contraction.

Figure 6-1 View Unified Address Space Page

An address block is an aggregate of IP addresses based on a power-of-two address space that can be delegated to an authority. For example, the 192.168.0.0/16 address block (part of the RFC 1918 private address space) includes 216 (or 65536) addresses. Address blocks can be further divided into child address blocks and subnets. For example, you might want to delegate the 192.168.0.0/16 address block further into four child address blocks—192.168.0.0/18, 192.168.64.0/18, 192.168.128.0/18, and 192.168.192.0/18.


Note The DHCP server also uses address blocks to manage subnet allocation for on-demand address pools. See the Network Registrar User's Guide for details on this feature. Address blocks used for dynamic address pools must be created using the address-block command in the CLI. The unified address view in the Web UI also displays these dynamic address blocks, but does not provide an edit link to them, because they have been delegated in their entirety to the DHCP server. They should not be further subdivided for subnet allocation. The DHCP server automatically handles these address blocks as it receives subnet requests. These address pools are indicated by a D (for "Delegated").


A subnet is the leaf node of the address space and cannot be further subdivided. If you create the 192.168.50.0/24 subnet, you can subsequently create an address block by that same name, and the subnet will become a child of the address block. However, you cannot further subdivide or delegate the 192.168.50.0/24 subnet.

Subnets can have one or more defined address ranges. Address blocks cannot have address ranges. When you create an address range for a subnet using the Web UI, it becomes a static range, meaning that it cannot be allocated dynamically using DHCP. However, the Web UI shows any dynamic ranges defined by DHCP scopes for the subnet. Displaying the ranges as such indicates where overlaps may occur between assigning static addresses for the address space and dynamic addresses for scopes.

The address space view shows the hierarchy of address block and subnets and their parent-child relationships. The hierarchy does not go down to the level of address ranges for each subnet. These are displayed when you access the subnet.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Address Space tab. This opens the View Unified Address Space page (see Figure 6-1).

Actions to Take

To select a level of depth for the address space, click one of the numbers across the top, or click All to get all levels. The address space appears below the row of numbers. The Type column identifies the type of object displayed, an address block or a subnet. The Owner column identifies the owner of the address space, and the Region column identifies the assigned region for the address space.

Address spaces that were assigned dynamically are indicated by a D (for "Delegated") in the Type column. You cannot delete this delegated address space.

To refresh the view, click the Refresh icon ().

Managing Address Blocks

An address block is a range of IP addresses that are within properly aligned power-of-two boundaries and that can be subdivided by further address blocks and subnets. An address block consists of an IP address and a netmask.


Note The DHCP server also uses address blocks to manage subnet allocation for on-demand address pools. See the Network Registrar User's Guide for details on this feature. Address blocks used for dynamic address pools must be created using the address-block command in the CLI. The unified address view in the Web UI also displays these dynamic address blocks, but does not provide an edit link to them, because they have been delegated in their entirety to the DHCP server. They should not be further subdivided for subnet allocation. The DHCP server automatically handles these address blocks as it receives subnet requests.


Listing and Adding Address Blocks

You add an address block based on its address, owner, administrative region, and a description.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Address Blocks tab. This opens the List/Add Address Blocks page (see Figure 6-2).

Figure 6-2 List/Add Address Blocks Page

Data to Enter

You can enter or select the fields described in Table 6-2 to create an address block. The address and mask values are required.

Table 6-2 Entries on the List/Add Address Blocks Page 

Entry
Description

Address/Mask*

Network address and mask (network prefix) of the address block. Enter the network address and select the mask from the drop-down list. Masks can range from 8 to 30. For the effect on the network number of these mask values, see Table 6-3. Required.

Owner

Owner of the address block. Select from the drop-down list of owners, as set in the "Managing Owners" section. Optional.

Region

Geographic region for the address block. Select from the drop-down list of predefined regions, as set in the "Managing Regions" section. Optional.

Description

Description of the address block. Optional.



Note Address blocks that were assigned dynamically are indicated by a D (for "Delegated") next to their name. You cannot delete this delegated address block.


Table 6-3 Subnet Masking 

Network Prefix
Equivalent Subnet Mask
Available Hosts

/8

255.0.0.0

16777214

/9

255.128.0.0

8338606

/10

255.192.0.0

4194302

/11

255.224.0.0

2097150

/12

255.240.0.0

1048574

/13

255.248.0.0

524286

/14

255.252.0.0

262142

/15

255.254.0.0

131070

/16

255.255.0.0

65534

/17

255.255.128.0

32766

/18

255.255.192.0

16382

/19

255.255.224.0

8190

/20

255.255.240.0

4084

/21

255.255.248.0

2046

/22

255.255.252.0

1022

/23

255.255.254.0

5010

/24

255.255.255.0

254

/25

255.255.255.128

126

/26

255.255.255.192

62

/27

255.255.255.224

30

/28

255.255.255.240

14

/29

255.255.255.248

6

/30

255.255.255.252

2


Actions to Take

After entering or selecting these values, click Add Address Block. To cancel, click any other Navigation bar tab. The address block you create appears in the table below the entry fields.

Editing or Adding Children to an Address Block

You might want to subdivide some static address blocks into child address blocks or subnets. You can add these objects from the Edit Address Block page.

How to Get There


Step 1 On the Primary Navigation bar, click the Address Space tab.

Step 2 On the Secondary Navigation bar, click the Address Blocks tab. This opens the List/Add Address Blocks page (see Figure 6-2).

Step 3 Click the address block name. This opens the Edit Address Block page (see Figure 6-3).

Figure 6-3 Edit Address Block Page


Data to Enter

The current address block is identified in the title of the page. To edit this address block's owner, region, or description, or add child address blocks and subnets, complete the fields described in Table 6-4.

Table 6-4 Entries on the Edit Address Block Page 

Entry
Description

Parent Block:

Owner
Region
Description

If the address block has a parent address block, you can modify the parent block by clicking its name under the Parent Block heading. You can also modify the owner, region, and description of the current address block. Select from the drop-down list of owners or regions, or modify the description text. Click Modify Address Block, or Cancel to cancel.

Note An address block delegated through DHCP is identified by the text "Block is delegated to DHCP" under the Description field. You cannot delete such delegated address blocks.

Child Address
Blocks:

Address/Mask
Description

You can add or edit child address blocks for the current address block. The Address/Mask is the network address and prefix of the child address block. Enter the network address in the left field and select the mask from the drop-down list. For a description of the mask values, see Table 6-3. Click Add to add the child address block. An error message appears if you try to set an address range as both an address block and a subnet.

If you omit a value when you click Add, the Web UI automatically adds the subdivisions of the parent address space with the appropriate mask value. For example, if the parent space is 192.168.50.0/24, you omit any child subnet value, and click Add, the Web UI adds the children in this order:

192.168.50.0/26
192.168.50.64/26
192.168.50.128/26
192.168.50.192/26

Child Subnets:

Address/Mask
Description

You can add or edit child subnets for the current address block, but you cannot create children for them. The Address/Mask is the network address and prefix mask of the child subnet. For a description of the mask values, see Table 6-3. Enter the network address in the left field and select the mask (network prefix) from the drop-down list. Click Add to add the subnet.

As with adding child address blocks, if you omit a value when you click Add, the Web UI automatically adds the subdivisions of the parent address space with the appropriate mask value.


Actions to Take

When you add the child address blocks or subnets, they are immediately implemented. You can return to the Address Block or Unified Address Space views and the address blocks and subnets will appear. Click Modify Address Block only if you want to modify the Owner, Region, or Description fields:

If the address block has a parent address block, you can edit the parent address block by clicking its name under the Parent Block heading. This opens the Edit Address Block page (see Figure 6-3).

If you modify the current address block's owner, region, and description, click Modify Address Block.

To add a child address block or subnet, enter values in the appropriate fields and click Add in the corresponding area.

To delete a child address block or subnet, click the Delete icon () next to its name, then confirm or cancel the deletion.

Managing Subnets

Subnets that represent the address ranges used by the DHCP server are automatically created from the DHCP scope configuration. You must manually create subnets for static IP address assignment. These static subnets are the leaf nodes of the address space and can only be subdivided into address ranges.

Adding Static Subnets

You can add static subnets on the List/Add Subnets page.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Subnets tab. This opens the List/Add Subnets page (see Figure 2-2).

Data to Enter

You can enter or select the fields described in Table 6-5 to create a subnet. The address and mask values are required.

Table 6-5 Entries on the List/Add Subnets Page 

Entry
Description

Address/Mask*

Network address and mask (network prefix) of the subnet. Enter the network address in the top field and select the mask (network prefix) from the drop-down list. Masks can range from 8 to 30. For a description of these mask numbers, see Table 6-3. Required.

Owner

Owner of the subnet. Select from the drop-down list of owners, as set up in the "Managing Owners" section. Optional.

Region

Geographic region for the subnet. Select from the drop-down list of predefined regions, as set up in the "Managing Regions" section. Optional.

Description

Description of the subnet. Optional.


Actions to Take

After entering or selecting these values, click Add Subnet to add the subnet. On this page, you can also edit and delete a subnet.

Editing or Adding Address Ranges to a Subnet

You can edit the subnet data and add any number of address ranges to a subnet. These ranges must be in the subnet's designated network.

How to Get There


Step 1 On the Primary Navigation bar, click the Address Space tab.

Step 2 On the Secondary Navigation bar, click the Subnets tab. This opens the List/Add Subnets page (see Figure 2-2).

Step 3 Click the name of the subnet to which you want to add address ranges. This opens the Edit Subnet page (see Figure 6-4).

Figure 6-4 Edit Subnet Page


Data to Enter

The current subnet is identified in the title of the page. You can modify the subnet data or add IP ranges, as described in Table 6-6.

Table 6-6 Entries on the Edit Subnets Page 

Entry
Description

Parent Block:

Owner
Region
Description

If the subnet has a parent block, you can edit the parent block by clicking its name under the Parent Block heading. If the subnet does not have a parent block, you can modify the subnet's owner, region, or description. After you modify any of these fields, click Modify Subnet.

IP Ranges:

Start
End

You can add a starting and ending address of one or more IP ranges. The value has to be in the range specified by the subnet's designated network. After adding each range, click Add IP Range. The ranges are added immediately.


Actions to Take

You can modify owner, region, and description values, and add and delete ranges, for the subnet:

If the subnet has a parent address block, you can edit the parent address block by clicking its name under the Parent Block heading. This opens the Edit Address Block page (see Figure 6-3).

If you do not want to make any further changes to this page, click Cancel.

If you want to modify the owner, region, and description data for the subnet, edit the appropriate field, then click Modify Subnet. This has no effect on adding IP ranges. You return to the List/Add Subnets page.

To add IP ranges, click Add IP Range for each start and end address added. Each IP range is added immediately.

To delete an IP range, click the Delete icon () next to its starting address, then confirm or cancel the deletion.

Managing Owners

Every address block or subnet can have an owner. You create these owners on the List/Add Owners page.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Owners tab. This opens the List/Add Owners page, which is identical to the one for zone owners (see Figure 4-10).

Data to Enter

You can enter the fields described in Table 6-7 to create an owner. The fields marked with an asterisk (*) are required.

Table 6-7 Entries on the List/Add Owners Page 

Entry
Description

Tag*

Identifiable tag for the owner. Should be an abbreviated form of the full owner name. Required.

Name*

Full name of the owner. For example, this can be an ISP name or corporate entity. Required.

Contact

Name of the administrative contact for the address block owner. Optional


Actions to Take

You can add and delete owners, and select an owner for editing, on this page:

To add the owner information, click Add Owner.

To delete an owner, click the Delete icon () next to its tag.

To edit an existing owner, click its name. This opens the Edit Owner page, which includes the same fields as the List/Add Owners page and is identical to the Edit Owners page for a DNS zone (see Figure 4-11). Modify these fields as required. To unset fields, check the Unset? box next to the field, then click Unset Fields. To complete the edit, click Modify Owner, or click Cancel to cancel the modification.

Managing Regions

Every address block or subnet can have a designated region. A region is an arbitrary geographic region. You create these regions on the List/Add Regions page.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Regions tab. This opens the List/Add Regions page (see Figure 6-5).

Figure 6-5 List/Add Regions Page

Data to Enter

You can enter the fields described in Table 6-8 to create a region. The fields marked with an asterisk (*) are required.

Table 6-8 Entries on the List/Add Regions Page 

Entry
Description

Tag*

Identifiable tag for the region. Should be an abbreviated form of the full region name. Required.

Name*

Full name of the region. Should be an identifiable geographic region. Required.

Contact

Name of the administrative contact for the region. Optional.


Actions to Take

You can add and delete regions, and select a region for editing, on this page:

To add the region information, click Add Region.

To delete a region, click the Delete icon () next to its name.

To edit an existing region, click its name. This opens the Edit Region page, which includes the same fields as the List/Add Regions page (see Table 6-8). Modify the fields as required. To unset fields, check the Unset? box next to the field, then click Unset Fields. To complete the edit, click Modify Region, or click Cancel to cancel the modification.

Viewing Data Consistency

Consistency rules let you check data inconsistencies, such as overlapping address ranges and subnets.

Adding Data Consistency Rules

You can select these consistency rules:

Check IP Range Consistency

Check Subnet Consistency

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Consistency Rules tab. This opens the List Consistency Rules page (see Figure 6-6).

Figure 6-6 List Consistency Rules Page

Actions to Take

You can select one or both of the two consistency rules:

Check IP Range Consistency

Check Subnet Consistency

Click Run Rules. This opens the Consistency Rules Result page.

Viewing the Consistency Results

The Consistency Rules Result page lets you view where there may be inconsistencies in the data.

How to Get There

On the Primary Navigation bar, click the Address Space tab. On the Secondary Navigation bar, click the Consistency Rules tab to open the List Consistency Rules page (see Figure 6-6). Select one or both of the consistency rules, then click Run Rules. This opens the Consistency Rules Result page (see Figure 6-7).

Figure 6-7 Consistency Rules Result Page

The page has the display columns indicated in Table 6-9.

Table 6-9 Display Columns on the Consistency Rules Result Page 

Column
Description

Violation

How the consistency was violated. Results include violation values such as duplicated or overlapped. If you click the violation value, the Consistency Rule Details page appears.

Primary Object Name

Shows a range of addresses or subnets.

Primary Object Type

Includes object types such as CCMIPRange and CCMSubnet.

Secondary Object Name

Shows a range of addresses or subnets.

Secondary Object Type

Includes object types such as CCMIPRange and CCMSubnet.


Actions to Take

When you click a rule violation value (such as overlapped or nested) on the Consistency Rules Result page, the Consistency Rule Details page shows the details for the violation (see Figure 6-8). For example, it may show two CCMIPRange values with a violation of overlapped. If you click the range addresses, the Edit Subnet page for that range appears, where you can correct or delete the overlapping range (see the "Editing or Adding Address Ranges to a Subnet" section).

Figure 6-8 Consistency Rule Details Page

To move from the Consistency Rule Details page, click another tab on the Navigation bar.