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This module describes how you can simplify the administration of networks with devices that require static group membership entries on many interfaces by configuring IGMP static group range support to specify group ranges in class maps and attach the class maps to an interface.
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prior to the introduction of the IGMP Static Group Range Support feature, there was no option to specify group ranges for static group membership. Administering devices that required static group membership entries on many interfaces was challenging in some network environments because each static group had to be configured individually. The result was configurations that were excessively long and difficult to manage.
The IGMP Static Group Range Support feature introduces the capability to configure group ranges in class maps and attach class maps to the interface.
A class is a way of identifying a set of packets based on its contents. A class is designated through class maps. Typically, class maps are used to create traffic policies. Traffic policies are configured using the modular quality of service (QoS) command-line interface (CLI) (MQC). The normal procedure for creating traffic policies entails defining a traffic class, creating a traffic policy, and attaching the policy to an interface.
The IGMP Static Group Range Support feature introduces a type of class map that is used to define group ranges, group addresses, Source Specific Multicast (SSM) channels, and SSM channel ranges. Once created, the class map can be attached to interfaces.
Unlike QoS class maps, which are defined by specifying numerous match criteria, IGMP static group class maps are defined by specifying multicast groups entries (group addresses, group ranges, SSM channels, and SSM channel ranges). Also, IGMP static group range class maps are not configured in traffic policies. Rather, the ip ignmp static-group command has been extended to support IGMP static group ranges.
Once a class map is attached to an interface, all group entries defined in the class map become statically connected members on the interface and are added to the IGMP cache and IP multicast route (mroute) table.
Perform this task to create and define an IGMP static group class and attach the class to an interface.
Perform this optional task to verify the contents of IGMP static group class maps configurations, and to confirm that all group entries defined in class maps were added to the IGMP cache and the mroute table after you attached class maps to interfaces.
The following example shows how to configure a class map and attach the class map to an interface. In this example, a class map named static is configured and attached to FastEthernet interface 3/1.
class-map type multicast-flows static group 227.7.7.7 group 232.7.7.7 to 232.7.7.9 source 10.1.1.10 group 232.7.7.7 source 10.1.1.10 group 227.7.7.7 to 227.7.7.9 . . . ! interface FastEthernet3/1 ip address 192.168.1. 2 255.255.255.0 ip pim sparse-dense-mode ip igmp static-group class-map static !
The following is sample output from the show ip igmp static-group class-map command. In this example, the output displays the contents of the IGMP static group class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section).
Device# show ip igmp static-group class-map
Class-map static
Group address range 227.7.7.7 to 227.7.7.9
Group address 232.7.7.7, source address 10.1.1.10
Group address range 232.7.7.7 to 232.7.7.9, source address 10.1.1.10
Group address 227.7.7.7
Interfaces using the classmap:
FastEthernet3/1
The following is sample output from the show ip igmp groups command. In this example, the command is issued to confirm that the group entries defined in the class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section) were added to the IGMP cache.
Device# show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter
232.7.7.7 FastEthernet3/1 00:00:09 stopped 0.0.0.0
232.7.7.9 FastEthernet3/1 00:00:09 stopped 0.0.0.0
232.7.7.8 FastEthernet3/1 00:00:09 stopped 0.0.0.0
227.7.7.7 FastEthernet3/1 00:00:09 stopped 0.0.0.0
227.7.7.9 FastEthernet3/1 00:00:09 stopped 0.0.0.0
227.7.7.8 FastEthernet3/1 00:00:09 stopped 0.0.0.0
224.0.1.40 FastEthernet3/2 01:44:50 00:02:09 10.2.2.5
224.0.1.40 Loopback0 01:45:22 00:02:32 10.3.3.4
The following is sample output from the show ip mroutecommand. In this example, the command is issued to confirm that the group entries defined in the class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section) were added to the mroute table.
Device# show ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(10.1.1.10, 232.7.7.7), 00:00:17/00:02:42, flags: sTI
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.9), 00:00:17/00:02:42, flags: sTI
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.8), 00:00:18/00:02:41, flags: sTI
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.7), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.9), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.8), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
Outgoing interface list:
FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 224.0.1.40), 00:01:40/00:02:23, RP 10.2.2.6, flags: SJCL
Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
Outgoing interface list:
Loopback0, Forward/Sparse-Dense, 00:01:40/00:02:23
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
Cisco IOS Master Commands List, All Releases |
IP multicast commands |
Cisco IOS IP Multicast Command Reference |
Standard/RFC |
Title |
---|---|
RFC 2933 |
Internet Group Management Protocol MIB |
MIB |
MIBs Link |
---|---|
IGMP-MIB | To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
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. |
The following table provides release information about the feature or features described in this module. This 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.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 | Feature Information for IGMP Static Group Range Support |
Feature Name |
Releases |
Feature Information |
---|---|---|
IGMP Static Group Range Support |
12.2(18)SXF5 Cisco IOS XE Release 2.6 15.0(1)M 12.2(33)SRE 15.1(1)SG Cisco IOS XE Release 3.3SG |
The IGMP Static Group Range Support feature introduces the capability to configure group ranges in class maps and attach class maps to an interface. This feature is an enhancement that simplifies the administration of networks with devices that require static group membership entries on many interfaces. The following commands were introduced or modified by this feature: class-map type multicast-flows, group (multicast-flows), ip igmp static-group , show ip igmp static-group class-map. |
IGMP MIB Support Enhancements for SNMP |
12.2(11)T 12.2(33)SRE Cisco IOS XE Release 2.1 15.1(1)SG 12.2(50)SY 15.0(1)S |
The Internet Group Management Protocol (IGMP) is used by IP hosts to report their multicast group memberships to neighboring multicast routers. The IGMP MIB describes objects that enable users to remotely monitor and configure IGMP using Simple Network Management Protocol (SNMP). It also allows users to remotely subscribe and unsubscribe from multicast groups. The IGMP MIB Support Enhancements for SNMP feature adds full support of RFC 2933 (Internet Group Management Protocol MIB) in Cisco IOS software. There are no new or modfied commands for this feature. |
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.