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First Published: February 18, 2014
Cisco IOS 12.2(33)SCH2 introduces the Layer 3 CPE Mobility feature, which allows the mobility CPE devices to move between cable modems with as less disruption of traffic as possible.
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
Table below shows the hardware compatibility prerequisites for this feature.
Note | The hardware components introduced in a given Cisco IOS Release will be supported in all subsequent releases unless otherwise specified. |
Cisco CMTS Platform |
Processor Engine |
Cable Interface Cards |
---|---|---|
Cisco uBR10012 Universal Broadband Router |
Cisco IOS Release 12.2(33)SCH2 and later releases |
Cisco IOS Release 12.2(33)SCC and later releases
Cisco IOS Release 12.2(33)SCE and later releases
|
Cisco uBR7246VXR Universal Broadband Router |
Cisco IOS Release 12.2(33)SCA and later releases
|
Cisco IOS Release 12.2(33)SCD and later releases
|
Cisco uBR7225VXR Universal Broadband Router |
Cisco IOS Release 12.2(33)SCB and later releases
|
Cisco IOS Release 12.2(33)SCD and later releases
|
Please remove the previous online CPEs or reset CMs,
The Layer 3 CPE Mobility feature allows CPE devices to move from cable modem to other by trigger of any unicast upstream packets of IPv4 or IPV6.
Each cable modem would be situated at a business hotspot location and the CPE devices move from one business location to another, where the service provider is the same and the head end CMTS is the same. This mobility is allowed for selected IP subnets.
The maximum number of subnets supported is 2 IPv6 and 6 IPv4 subnets per bundle or sub-bundle interface. To support more subnets, configure more bundle or sub-bundle interfaces.
The IPv4 or IPv6 subnets that are configured with mobility must match with the IPv4 or IPv6 subnets already configured on bundle or sub-bundle interface. Otherwise, configuration will not be accepted and the following message will be displayed:
Please remove the previous online CPEs or reset CMs,
When you remove mobility subnets under bundle or sub-bundle interface. The following warning message will be displayed after mobility subnets is configured or removed.
Warning: Please remove the previous online CPEs or reset CMs, to make the mobility scope change works for every device !!!
Note | If you have enabled mobility configuration for a subnet, the existing online CPE devices will not be aware of the mobility subnets. So after mobility subnets is configured, in order to make the mobility feature work for every CPE device, remove the online CPE devices or reset cable modem. |
The feature provides the movement of CPE devices from one cable modem to another without change in the IP address and the TCP or UDP sessions established are maintained.
This section describes how to enable mobility on a particular IP subnet on a interface or subinterface bundle.
Mobility subnets should match the IPv4 or IPv6 address configured on the bundle or sub-bundle interface.
Troubleshooting Tips
If the mobility IP address does not match with the mobility subnet, the following warning message is displayed:
Mobility IP should match the IDB subnet!
If you remove the IPv4 or IPv6 address from the interface, the mobility scope is removed for the IP address and the following warning message is displayed.
IPv6 2001:DBB:3:111::1 removed from Mobility subnets on Bundle1
.
This section describes how to configure or modify the PXF divert limit. This procedure is optional and if not configured, will set the value to the default value.
Note | If cable l3 mobility command on the bundle or sub-bundle interface is enabled, the PXF divert limit is also enabled by default. So this configuration is optional. |
Ensure that the cable l3 mobility command is enabled on the bundle or sub-bundle interface. If disabled, the service divert-limit l3-mobility function does not work.
Command or Action | Purpose | |
---|---|---|
Step 1 | enable
Example: Router> enable |
Enables privileged EXEC mode. Enter your password if prompted. |
Step 2 | configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. |
Step 3 |
service
divert-limit
l3-mobility-counter
limit
|
l3-mobility-timeslot
timeslot
Example: Router(config-if)# service divert-limit l3-mobility-counter 1 Router(config-if)# service divert-limit l3-mobility-timeslot 1 |
Configures the PXF threshold limit and timslot.
|
Step 4 | exit
Example:
Router(config-if)# exit
|
Exits global configuration mode. |
This section describes how to disable mobility on a particular IP subnet.
The CPE mobility should be enabled on a particular IP subnet before you complete this procedure.
Command or Action | Purpose | |||
---|---|---|---|---|
Step 1 | enable
Example: Router> enable |
Enables privileged EXEC mode. Enter your password if prompted. | ||
Step 2 | configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. | ||
Step 3 | interface
bundle
bundle
number |
bundle-subif-number
Example: Router(config)# interface bundle 1 or Router(config)# interface Bundle 1.1 |
Enters interface configuration or subinterface mode. | ||
Step 4 | no
cable
l3-mobility
IP-address
mask
|
IPv6
prefix
Example: Router(config-if)# cable l3-mobility 192.0.3.1 255.255.255.0 Router(config-if)# cable l3-mobility 2001:DB:22:1::1/64 |
Disbles mobility for a particular IPv4 or IPv6 subnet.
| ||
Step 5 | exit
Example: Router(config-if)# exit |
Exits interface configuration mode. |
To verify the layer 3 mobility configuration, use the show cable bundle command.
Router# show cable bundle 1 mobility Interface IP/IPv6 Subnet
-------------------------------------------------------------------------------
Bundle1 ---
Bundle1.1 192.0.3.0/16
192.0.3.1/16
192.0.4.1/16
2001:DB:5:4:100::1/32
2001:DB:5:4:101::1/32
Bundle1.2 192.0.3.1/16
This section provides the following configuration examples:
The following example shows how to configure the layer 3 CPE mobility on a interface bundle:
Router#show running interface bundle 10 Building configuration... Current configuration : 1247 bytes ! interface Bundle10 ip address 192.0.3.1 255.255.255.0 secondary ip address 192.2.21.1 255.255.255.0 secondary ip address 192.3.23.1 255.255.255.0 ip pim sparse-dense-mode ip igmp static-group 231.1.1.1 no cable arp filter request-send no cable arp filter reply-accept cable l3-mobility 192.0.3.1 255.255.255.0 cable l3-mobility 192.2.21.1 255.255.255.0 cable l3-mobility 192.3.23.1 255.255.255.0 cable l3-mobility 2001:DB:26:1::1/64 cable l3-mobility 2001:DB:27:1::1/96 cable dhcp-giaddr primary cable helper-address 20.1.0.3 ipv6 address 2001:DB:26:1::1/64 ipv6 address 2001:DB:27:1::1/96 ipv6 enable ipv6 nd reachable-time 3600000 ipv6 nd managed-config-flag ipv6 nd other-config-flag ipv6 dhcp relay destination 2001:DB:1:1:214:4FFF:FEA9:5863 end
The following example shows how to configure the PXF divert rate limit mobility counter and mobility timeslot:
Router# show run | in divert-limit service divert-limit l3-mobility-counter 127 service divert-limit l3-mobility-timeslot 100
The following sections provide references related to Spectrum Management and Advanced Spectrum Management for the Cisco CMTS routers.
Related Topic |
Document Title |
---|---|
CMTS Command Reference |
http://www.cisco.com/en/US/docs/ios/cable/command/reference/cbl_book.html Cisco Broadband Cable Command Reference Guide. |
Standards |
Title |
---|---|
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
|
MIBs |
MIBs Link |
---|---|
No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFC |
Title |
---|---|
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature. |
— |
Description |
Link |
---|---|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.
Note | The below table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
Feature Name |
Releases |
Feature Information |
---|---|---|
Layer 3 Mobility |
12.2(33)SCH2 |
This feature was introduced for the Cisco uBR10012 and Cisco uBR7200 series universal broadband routers. |