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The CMTS enhanced multicast new features are consistent with DOCSIS 3.0 specifications and include:
Enhanced multicast echo in which the Layer 3 multicast switching path uses a Cisco Packet Processor (CPP) parallel express forwarding multicast routing table.
Enhanced multicast quality of service (MQoS) framework that specifies a group configuration (GC) to define a session range of multicast addresses and rule priorities and its associated multicast VPN (MVPN).
Intelligent multicast admission control to include multicast service flows.
Enhanced multicast VPN feature to configure and support multicast traffic in a multiprotocol label switching (MPLS)-VPN environment.
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.
Note | The hardware components introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified. |
Cisco CMTS Platform |
Processor Engine |
Interface Cards |
---|---|---|
Cisco cBR-8 Converged Broadband Router |
Cisco IOS-XE Release 3.15.0S and Later Releases Cisco cBR-8 Supervisor:
|
Cisco IOS-XE Release 3.15.0S and Later Releases Cisco cBR-8 CCAP Line Cards: Cisco cBR-8 Downstream PHY Modules: Cisco cBR-8 Upstream PHY Modules: |
The type of service (ToS) parameter is not recognized by the Cisco cBR series routers.
To avail 40000 multicast sessions, a minimum of one bundle should be present for each LC.
IP multicast—transmission of the same information to multiple cable network recipients—improves bandwidth efficiency and allows service providers to offer differentiated quality of service for different types of traffic. Enhanced multicast introduces multicast improvements as mandated by the introduction of DOCSIS 3.0 specifications.
Note | DOCSIS 3.0 standards retain backwards compatibility with the DOCSIS 2.0 multicast mode of operation. |
The Cisco cBR routers support 40000 DSG multicast sessions per chassis.
The following are the benefits of CMTS enhanced multicast are:
In the new multicast QoS (MQoS) framework, you can specify a group configuration (GC) that defines a session range of multicast addresses and rule priorities and its associated multicast VPN (MVPN). For every GC, there is attached a group QoS configuration (GQC) and a group encryption rule.
Based on the session range, rule priority, and MVPN, a multicast service flow is admitted into a GC and the associated GQC and group encryption rule are applied to the flow. In MQoS implementation, the source address of the multicast session is not checked because the current implementation for cable-specific multicast supports IGMP Version 2 but not IGMP Version 3. The downstream service flow, service identifier (SID), and MAC-rewrite string are created at the time of a new IGMP join (or static multicast group CLI on the interface) and MQoS is applied to the new multicast group join.
The benefits of enhanced QoS are the following:
Admission control allows you to categorize service flows into buckets. Examples of categories are the service class name used to create the service flow, service flow priority, or the service flow type such as unsolicited grant service (UGS). Bandwidth limits for each bucket can also be defined. For example, you can define bucket 1 for high priority packet cable service flows and specify that bucket 1 is allowed a minimum of 30 percent and a maximum of 50 percent of the link bandwidth.
Intelligent multicast admission control includes additional features such as the inclusion of multicast service flows using the GSF concept. GSFs are created based on the rules as defined in the GQC table. The rules link the multicast streams to a GSF through the session range. The service class name in the rule defines the QoS for that GSF. Additionally, another attribute is added to the rules and the group configuration table to specify the application type to which each GSF belongs. In this way, the QoS associated with each GSF is independent of the bucket category for the GSF.
The benefits of intelligent multicast admission control are the following:
In a multicast video environment, you can limit the number of multicast sessions admitted onto a particular service flow. The multicast session limit feature—which adds functionality on top of the multicast QoS infrastructure—enables you to specify the number of multicast sessions to be admitted on a particular service flow. If the current number of sessions has reached the defined limit, new sessions will be forwarded but they will make use of the default multicast service flow until a session ends to free up a slot for new sessions.
The new multicast VPN (MVPN) feature allows you to configure and support multicast traffic in a multiprotocol label switching (MPLS)-VPN environment. This feature supports routing and forwarding of multicast packets for each individual VPN virtual routing and forwarding (VRF) instance, and also provides a mechanism to transport VPN multicast packets across the service provider backbone.
MVPN allows you to connect multiple remote sites or devices over either a Layer 3 or Layer 2 VPN. A Layer 3 VPN enables the routing of traffic inside the VPN. A Layer 2 VPN provides a bridging transport mechanism for traffic between remote sites belonging to a customer. To support multicast over Layer 3 VPNs, each VPN receives a separate multicast domain with an associated MVPN routing and forwarding (mVRF) table maintained by the provider edge (PE) router. In a cable environment, the PE router is a routing CMTS. The provider network builds a default multicast distribution tree (default-MDT) for each VPN between all the associated mVRF-enabled PE routers. This tree is used to distribute multicast traffic to all PE routers.
To enable maximum security and data privacy in a VPN environment, the CMTS distinguishes between multicast sessions on the same downstream interface that belong to different VPNs. To differentiate multicast traffic between different VPNs, the CMTS implements a per-VRF subinterface multicast security association identifier (MSAID) allocation feature that is BPI+ enabled. The MSAID is allocated for each cable bundle group for each subinterface. A multicast group has a specific MSAID for each VRF instance.
This section contains the following procedures:
To configure a QoS profile that can be applied to a QoS group configuration, use the cable multicast group-qos command. You must configure a QoS profile before you can add a QoS profile to a QoS multicast group.
You can specify a group configuration (GC) that defines a session range of multicast addresses and rule priorities and its associated multicast VPN (MVPN). For every GC, there is attached a group QoS configuration and a group encryption rule.
Command or Action | Purpose | |||
---|---|---|---|---|
Step 1 | enable
Example: Router> enable |
Enables privileged EXEC mode. | ||
Step 2 | configureterminal
Example: Router# configure terminal |
Enters global configuration mode. | ||
Step 3 |
cable
multicast
group-qos
number
scn
service-class-name
control {single |
aggregate
[limit
max-sessions]}
Example: Router(config-mqos)# cable multicast group-qos 5 scn name1 control single |
(Optional) Configures a QoS profile that can be applied to a multicast QoS group.
| ||
Step 4 | cable
multicast
qos
group
id
priority
value
[global ]
Example: Router(config)# cable multicast qos group 2 priority 6 |
Configures a multicast QoS group and enters multicast QoS configuration mode. | ||
Step 5 |
session-range
ip-address
ip-mask
Example: Router(config-mqos)# session-range 224.10.10.10 255.255.255.224 |
Specifies the session range IP address and IP mask of the multicast QoS group. You can configure multiple session ranges. | ||
Step 6 |
tos
low-byte
high-byte
mask
Example: Router(config-mqos)# tos 1 6 15 |
(Optional) Specifies the minimum type of service (ToS) data bytes, maximum ToS data bytes, and mask for a multicast QoS group. | ||
Step 7 |
vrfname
Example: Router(config-mqos)# vrf name1 |
(Optional) Specifies the name for the virtual routing and forwarding (VRF) instance.
| ||
Step 8 |
application-idnumber
Example: Router(config-mqos)# application-id 25 |
(Optional) Specifies the application identification number of the multicast QoS group. This value is configured to enable admission control to the multicast QoS group. |
Each virtual routing and forwarding (VRF) instance that is defined must match a defined MQoS group to avoid multicast stream crosstalk between VRFs. To avoid potential crosstalk, define a default MQoS group that is assigned to the VRF whenever the multicast traffic in the VRF does not match an existing MQoS group.
Command or Action | Purpose | |
---|---|---|
Step 1 | enable
Example: Router> enable |
Enables privileged EXEC mode. |
Step 2 | configure
terminal
Example: Router# configure terminal |
Enters global configuration mode. |
Step 3 |
cable
multicastgroup-qosnumber
scnservice-class-name
control
{single |
aggregate [limit
max-sessions]}
Example: Router(config-mqos)# cable multicast group-qos 5 scn name1 control single |
(Optional) Configures a QoS profile that can be applied to a multicast QoS group. |
Step 4 | cable
multicast
qos
group
id
priority
255
global
Example: Router(config)# cable multicast qos group 2 priority 255 global |
Configures a default multicast QoS group and enters multicast QoS configuration mode. |
Step 5 |
session-range 224.0.0.0
224.0.0.0
Example: Router(config-mqos)# session-range 224.0.0.0 224.0.0.0 |
Specifies the session-range IP address and IP mask of the default multicast QoS group. By entering 224.0.0.0 for the IP address and the IP mask you cover all possible multicast sessions. |
Step 6 |
vrfname
Example: Router(config-mqos)# vrf name1 |
Specifies the name of the virtual routing and forwarding (VRF) instance. |
Step 7 |
application-idnumber
Example: Router(config-mqos)# application-id 5 |
(Optional) Specifies the application identification number of the multicast QoS group. This value is configured to enable admission control to the multicast QoS group. |
To verify the configuration of the Multicast VPN and DOCSIS 3.0 Multicast QoS Support feature, use the show commands described below.
Router# show interface bundle 1 multicast-sessions Multicast Sessions on Bundle1 Group Interface GC SAID SFID GQC GEn RefCount GC-Interface State 234.1.1.45 Bundle1.1 1 8193 --- 1 5 1 Bundle1 ACTIVE 234.1.1.46 Bundle1.1 1 8193 --- 1 5 1 Bundle1 ACTIVE 234.1.1.47 Bundle1.1 1 8193 --- 1 5 1 Bundle1 ACTIVE Aggregate Multicast Sessions on Bundle1 Aggregate Sessions for SAID 8193 GQC 1 CurrSess 3 Group Interface GC SAID SFID AggGQC GEn RefCount GC-Interface 234.1.1.45 Bundle1.1 1 8193 --- 1 5 1 Bundle1 234.1.1.46 Bundle1.1 1 8193 --- 1 5 1 Bundle1 234.1.1.47 Bundle1.1 1 8193 --- 1 5 1 Bundle1
Router# show interface cable 7/0/0 multicast-sessions Default Multicast Service Flow 3 on Cable7/0/0 Multicast Sessions on Cable7/0/0 Group Interface GC SAID SFID GQC GEn RefCount GC-Interface State 234.1.1.45 Bundle1.1 1 8193 24 1 5 1 Bundle1 ACTIVE 234.1.1.46 Bundle1.1 1 8193 24 1 5 1 Bundle1 ACTIVE 234.1.1.47 Bundle1.1 1 8193 24 1 5 1 Bundle1 ACTIVE Aggregate Multicast Sessions on Cable7/0/0 Aggregate Sessions for SAID 8193 SFID 24 GQC 1 CurrSess 3 Group Interface GC SAID SFID AggGQC GEn RefCount GC-Interface 234.1.1.45 Bundle1.1 1 8193 24 1 5 1 Bundle1 234.1.1.46 Bundle1.1 1 8193 24 1 5 1 Bundle1 234.1.1.47 Bundle1.1 1 8193 24 1 5 1 Bundle1
Router# show interface cable 6/1/0 modem SID Priv Type State IP address method MAC address Dual bits IP 9 11 modem online(pt) 101.1.0.6 dhcp 0006.28f9.8c79 N 9 11 host unknown 111.1.1.45 dhcp 0018.1952.a859 N 10 10 modem online(pt) 101.1.0.5 dhcp 0006.5305.ac19 N 10 10 host unknown 111.1.0.3 dhcp 0018.1952.a85a N 13 10 modem online(pt) 101.1.0.3 dhcp 0014.f8c1.fd1c N 8195 10 multicast unknown 224.1.1.51 static 0000.0000.0000 N 8195 10 multicast unknown 224.1.1.49 static 0000.0000.0000 N 8195 10 multicast unknown 224.1.1.50 static 0000.0000.0000 N
This section provides the following configuration examples:
Note | To add group QoS and group encryption profiles to a QoS group, you must configure each profile first before configuring the QoS group. |
In the following example, QoS profile 3 and encryption profile 35 are configured.
configure terminal cable multicast group-qos 3 scn name1 control single cable multicast group-encryption 35 algorithm 56bit-des
In the following example, QoS group 2 is configured with a priority of 6 and global application. To QoS group 2, QoS profile 3 and encryption profile 35 are applied. Other parameters are configured for QoS group 2 including application type, session range, ToS, and VRF.
cable multicast qos group 2 priority 6 global group-encryption 35 group-qos 3 session-range 224.10.10.01 255.255.255.254 tos 1 6 15 vrf vrf-name1 application-id 44
The following sections provide references related to the Multicast VPN and DOCSIS 3.0 Multicast QoS Support.
Related Topic |
Document Title |
---|---|
CMTS cable commands |
Cisco CMTS Cable Command Reference http://www.cisco.com/c/en/us/td/docs/cable/cmts/cmd_ref/b_cmts_cable_cmd_ref.html |
Standard |
Title |
---|---|
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
— |
MIB |
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 |
---|---|
RFC 2236 |
Internet Group Management Protocol, Version 2 |
Description |
Link |
---|---|
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Note | The table below 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 |
---|---|---|
Multicast VPN and DOCSIS3.0 Multicast QoS Support |
Cisco IOS-XE Release 3.15.0S |
This feature was introduced on the Cisco cBR Series Converged Broadband Routers. |