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IP Multicast Commands
This chapter contains IP Multicast commands that are relevant to the Catalyst 3850 switch.
- clear ip mfib
- clear ip mroute
- debug platform ip multicast
- ip igmp filter
- ip igmp max-groups
- ip igmp profile
- ip igmp snooping
- ip igmp snooping last-member-query-count
- ip igmp snooping querier
- ip igmp snooping report-suppression
- ip igmp snooping vlan mrouter
- ip igmp snooping vlan static
- ip multicast auto-enable
- ip multicast vlan
- ip pim accept-register
- ip pim bsr-candidate
- ip pim rp-candidate
- ip pim send-rp-announce
- ip pim spt-threshold
- mrinfo
- show ip igmp filter
- show ip igmp profile
- show ip igmp snooping
- show ip igmp snooping groups
- show ip igmp snooping igmpv2-tracking
- show ip igmp snooping mrouter
- show ip igmp snooping querier
- show ip igmp snooping wireless mcast-spi-count
- show ip igmp snooping wireless mgid
- show ip pim all-vrfs tunnel
- show ip pim autorp
- show ip pim bsr-router
- show ip pim bsr
- show ip pim tunnel
- show platform ip multicast
- show wireless multicast
- wireless multicast
clear ip mfib
To clear the IP multicast forwarding information base cache, use the clear ip mfib privileged exec command.
Syntax Description
counters Resets all active Multicast Forwarding Information Base (MFIB) traffic counters.
global Resets the IP multicast forwarding information base cache to the global default configuration.
vrf VPN-Instance Clears the IP multicast forwarding information base cache for the indicated VPN Routing/Forwarding instance.
Command History
Examples
Examples
The following example shows how to reset all active MFIB traffic counters for all multicast tables:
Switch# clear ip mfib countersThe following example shows how to reset the IP multicast forwarding information base cache to the global default configuration:
Switch# clear ip mfib globalThe following example shows how to clear the IP multicast forwarding information base cache for the indicated VPN Routing/Forwarding instance:
Switch# clear ip mfib vrfclear ip mroute
To delete entries from the IP multicast routing table, use the clear ip mroute privileged exec command.
Syntax Description
* (Optional) Deletes all multicast routes.
hostname (Optional) Deletes multicast routes for Hostname.
ip-address (Optional) Deletes multicast routes for IP Address.
vrf vrf-name (Optional) Specifies the name that is assigned to the multicast VPN routing and forwarding (VRF) instance.
group (Optional) Group or IP address of the multicast group; see the "Usage Guidelines" section for additional information.
Command History
Usage Guidelines
The group argument specifies one of the following:
If you specify a group name or address, you can also enter the source argument to specify a name or address of a multicast source that is sending to the group. A source does not need to be a member of the group.
Examples
Examples
The following example shows how to delete all entries from the IP multicast routing table:
Switch# clear ip mroute *The following example shows how to delete all sources on the 228.3.0.0 subnet that are sending to the multicast group 224.2.205.42 from the IP multicast routing table. This example shows how to delete all sources on network 228.3, not individual sources:
Switch# clear ip mroute 224.2.205.42 228.3.0.0debug platform ip multicast
To enable debugging of IP multicast routing, use the debug platform ip multicast command in EXEC mode. To disable debugging, use the no form of this command.
debug platform ip multicast { all | mdb | mdfs-rp-retry | midb | mroute-rp | resources | retry | rpf-throttle | snoop-events | software-forward | swidb-events | vlan-locks}
no debug platform ip multicast { all | mdb | mdfs-rp-retry | midb | mroute-rp | resources | retry | rpf-throttle | snoop-events | software-forward | swidb-events | vlan-locks}
Syntax Description
all
Displays all platform IP-multicast event debug messages.
Note Using this command can degrade the performance of the switch.
mdb
Displays IP-multicast debug messages for multicast distributed fast switching (MDFS) multicast descriptor block (mdb) events.
mdfs-rp-retry
Displays IP-multicast MDFS rendezvous point (RP) retry event debug messages.
midb
Displays IP-multicast MDFS multicast interface descriptor block (MIDB) debug messages.
mroute-rp
Displays IP-multicast RP event debug messages.
resources
Displays IP-multicast hardware resource debug messages.
retry
Displays IP-multicast retry processing event debug messages.
rpf-throttle
Displays IP-multicast reverse path forwarding (RPF) throttle event debug messages.
snoop-events
Displays IP-multicast IGMP snooping event debug messages.
software-forward
Displays IP-multicast software forwarding event debug messages.
swidb-events
Displays IP-multicast MDFS software interface descriptor block (swidb) or global event debug messages.
vlan-locks
Displays IP-multicast VLAN lock and unlock event debug messages.
Command History
Usage Guidelines
The undebug platform ip multicast command is the same as the no debug platform ip multicast command.
When you enable debugging on a switch stack, it is enabled only on the stack master. To enable debugging on a stack member, you can start a session from the stack master by using the session switch-number EXEC command. Then enter the debug command at the command-line prompt of the stack member. You also can use the remote command stack-member-number LINE EXEC command on the stack master switch to enable debugging on a member switch without first starting a session.
ip igmp filter
Use the ip igmp filter interface configuration command on the switch stack or on a standalone switch to control whether or not all hosts on a Layer 2 interface can join one or more IP multicast groups by applying an Internet Group Management Protocol (IGMP) profile to the interface. Use the no form of this command to remove the specified profile from the interface.
Syntax Description
Command History
Usage Guidelines
You can apply IGMP filters only to Layer 2 physical interfaces; you cannot apply IGMP filters to routed ports, switch virtual interfaces (SVIs), or ports that belong to an EtherChannel group.
An IGMP profile can be applied to one or more switch port interfaces, but one port can have only one profile applied to it.
Examples
Examples
This example shows how to configure IGMP profile 40 to permit the specified range of IP multicast addresses, then shows how to apply that profile to a port as a filter:
Switch(config)# ip igmp profile 40 Switch(config-igmp-profile)# permit Switch(config-igmp-profile)# range 233.1.1.1 233.255.255.255 Switch(config-igmp-profile)# exit Switch(config)# interface gigabitethernet1/0/2 Switch(config-if)# switchport *Jan 3 18:04:17.007: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1, changed state to down. NOTE: If this message appears, this interface changes to layer 2, so that you can apply the filter. Switch(config-if)# ip igmp filter 40You can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.
Related Commands
Command
Description
configures and enters IGMP Filter Profile configuration mode
show ip dhcp snooping statistics
displays DHCP snooping statistics
ip igmp max-groups
Use the ip igmp max-groups interface configuration command on the switch stack or on a standalone switch to set the maximum number of Internet Group Management Protocol (IGMP) groups that a Layer 2 interface can join or to configure the IGMP throttling action when the maximum number of entries is in the forwarding table. Use the no form of this command to set the maximum back to the default, which is to have no maximum limit, or to return to the default throttling action, which is to drop the report.
ip igmp max-groups [ max number | action { deny | replace} ]
no ip igmp max-groups { max number | action}
Syntax Description
max number The maximum number of IGMP groups that an interface can join. The range is 0 to 4294967294. The default is no limit.
action deny When the maximum number of entries is in the IGMP snooping forwarding table, drop the next IGMP join report. This is the default action.
action replace When the maximum number of entries is in the IGMP snooping forwarding table, replace the existing group with the new group for which the IGMP report was received.
Command Default
The default maximum number of groups is no limit.
After the switch learns the maximum number of IGMP group entries on an interface, the default throttling action is to drop the next IGMP report that the interface receives and to not add an entry for the IGMP group to the interface.
Command History
Usage Guidelines
You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces. You cannot set IGMP maximum groups for routed ports, switch virtual interfaces (SVIs), or ports that belong to an EtherChannel group.
Follow these guidelines when configuring the IGMP throttling action:
- If you configure the throttling action as deny and set the maximum group limitation, the entries that were previously in the forwarding table are not removed but are aged out. After these entries are aged out, when the maximum number of entries is in the forwarding table, the switch drops the next IGMP report received on the interface.
- If you configure the throttling action as replace and set the maximum group limitation, the entries that were previously in the forwarding table are removed. When the maximum number of entries is in the forwarding table, the switch replaces a randomly selected multicast entry with the received IGMP report.
- When the maximum group limitation is set to the default (no maximum), entering the ip igmp max-groups {deny | replace} command has no effect.
Examples
Examples
This example shows how to limit to 25 the number of IGMP groups that a port can join:
Switch(config)# interface gigabitethernet1/0/2 Switch(config-if)# ip igmp max-groups 25This example shows how to configure the switch to replace the existing group with the new group for which the IGMP report was received when the maximum number of entries is in the forwarding table:
Switch(config)# interface gigabitethernet2/0/1 Switch(config-if)# ip igmp max-groups action replaceYou can verify your setting by using the show running-config privileged EXEC command and by specifying an interface.
ip igmp profile
Use the ip igmp profile global configuration command on the switch stack or on a standalone switch to create an Internet Group Management Protocol (IGMP) profile and enter IGMP profile configuration mode. From this mode, you can specify the configuration of the IGMP profile to be used for filtering IGMP membership reports from a switchport. Use the no form of this command to delete the IGMP profile.
Syntax Description
Command Default
No IGMP profiles are defined. When configured, the default action for matching an IGMP profile is to deny matching addresses.
Command History
Usage Guidelines
When you are in IGMP profile configuration mode, you can create the profile by using these commands:
- deny: specifies that matching addresses are denied; this is the default condition.
- exit: exits from igmp-profile configuration mode.
- no: negates a command or resets to its defaults.
- permit: specifies that matching addresses are permitted.
- range: specifies a range of IP addresses for the profile. This can be a single IP address or a range with a start and an end address. When entering a range, enter the low IP multicast address, a space, and the high IP multicast address.
You can apply an IGMP profile to one or more Layer 2 interfaces, but each interface can have only one profile applied to it.
Examples
Examples
This example shows how to configure IGMP profile 40 that permits the specified range of IP multicast addresses:
Switch(config)# ip igmp profile 40 Switch(config-igmp-profile)# permit Switch(config-igmp-profile)# range 233.1.1.1 233.255.255.255You can verify your settings by using the show ip igmp profile privileged EXEC command.
Related Commands
Command
Description
applies IGMP profile to the interface
Displays configured IGMP profiles specified by the command
ip igmp snooping
Use the ip igmp snooping global configuration command on the switch stack or on a standalone switch to globally enable Internet Group Management Protocol (IGMP) snooping on the switch or to enable it on a per-VLAN basis. Use the no form of this command to return to the default setting.
Syntax Description
vlan vlan-id (Optional) Enable IGMP snooping on the specified VLAN. The range is 1 to 1001 and 1006 to 4094.
Command Default
IGMP snooping is globally enabled on the switch.
IGMP snooping is enabled on VLAN interfaces.
Command History
Usage Guidelines
When IGMP snooping is enabled globally, it is enabled in all the existing VLAN interfaces. When IGMP snooping is globally disabled, it is disabled on all the existing VLAN interfaces.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Related Commands
Command
Description
Enables IGMP report suppression
Displays IGMP snooping configurations
ip igmp snooping last-member-query-count
To configure how often Internet Group Management Protocol (IGMP) snooping will send query messages in response to receiving an IGMP leave message, use the ip igmp snooping last-member-query-count command in global configuration or bridge domain configuration mode. To set count to the default value, use the no form of the command.
ip igmp snooping [ vlan vlan-id] last-member-query-count count
no ip igmp snooping [ vlan vlan-id] last-member-query-count count
Syntax Description
vlan vlan-id (Optional) To set count on a specific vlan-id . The range is from 1 to 1001. Do not enter leading zeroes.
count The interval at which query messages are sent, in milliseconds. The range is from 1 to 7. The default is 2.
Command History
Usage Guidelines
When a multicast host leaves a group, the host sends an IGMP leave message. To check if this host is the last to leave the group, IGMP query messages are sent when the leave message is seen until the last-member-query-interval timeout period expires. If no response to the last-member queries are received before the timeout period expires, the group record is deleted.
Use the ip igmp snooping last-member-query-interval command to configure the timeout period.
When both IGMP snooping immediate-leave processing and the query count are configured, immediate-leave processing takes precedence.
Note
Do not set the count to 1, because in this situation the loss of a single packet--the query packet from the switch to the host or the report packet from the host to the switch--may result in traffic forwarding being stopped, even if there is still a receiver. Traffic will continue to be forwarded after the next general query sent by the switch, but the interval during which a receiver may not receive the query could be as long as 1 minute (with the default query interval).The leave latency in Cisco IOS software may increase by up to one last-member-query-interval (LMQI) value when the switch is processing more than one leave within a LMQI. In this case, the average leave latency is determined by the (count + 0.5) * LMQI. The result is that the default leave latency can range from 2.0 to 3.0 seconds with an average of 2.5 seconds under a higher load of IGMP leave processing. The leave latency under load for the minimum LMQI value of 100 milliseconds and a count of 1 is from 100 to 200 milliseconds, with an average of 150 milliseconds. This is done to limit the impact of higher rates of IGMP leave messages.
ip igmp snooping querier
Use the ip igmp snooping querier global configuration command on the switch stack or on a standalone switch to globally enable the Internet Group Management Protocol (IGMP) querier function in Layer 2 networks. Use the command with keywords to enable and configure the IGMP querier feature on a VLAN interface. Use the no form of this command to return to the default settings.
ip igmp snooping [ vlan vlan-id] querier [ address ip-address | max-response-time response-time | query-interval interval-count | tcn query { count count | interval interval} | timer expiry | version version]
no ip igmp snooping [ vlan vlan-id] querier [ address | max-response-time | query-interval | tcn query { count | interval} | timer expiry | version]
Syntax Description
vlan vlan-id (Optional) Enable IGMP snooping and the IGMP querier function on the specified VLAN. The range is 1 to 1001 and 1006 to 4094.
address ip-address (Optional) Specify a source IP address. If you do not specify an IP address, the querier tries to use the global IP address configured for the IGMP querier.
max-response-time response-time (Optional) Set the maximum time to wait for an IGMP querier report. The range is 1 to 25 seconds.
query-interval interval-count (Optional) Set the interval between IGMP queriers. The range is 1 to 18000 seconds.
tcn query (Optional) Set parameters related to Topology Change Notifications (TCNs). The keywords have these meanings:
count count Set the number of TCN queries to be executed during the TCN interval time. The range is 1 to 10.
interval interval Set the TCN query interval time. The range is 1 to 255.
timer expiry (Optional) Set the length of time until the IGMP querier expires. The range is 60 to 300 seconds.
version version (Optional) Select the IGMP version number that the querier feature uses. Select 1 or 2.
Command Default
The IGMP snooping querier feature is globally disabled on the switch.
When enabled, the IGMP snooping querier disables itself if it detects IGMP traffic from a multicast-enabled device.
Command History
Usage Guidelines
Use this command to enable IGMP snooping to detect the IGMP version and IP address of a device that sends IGMP query messages, which is also called a querier.
By default, the IGMP snooping querier is configured to detect devices that use IGMP Version 2 (IGMPv2) but does not detect clients that are using IGMP Version 1 (IGMPv1). You can manually configure the max-response-time value when devices use IGMPv2. You cannot configure the max-response-time when devices use IGMPv1. (The value cannot be configured and is set to zero).
Non-RFC compliant devices running IGMPv1 might reject IGMP general query messages that have a non-zero value as the max-response-time value. If you want the devices to accept the IGMP general query messages, configure the IGMP snooping querier to run IGMPv1.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Examples
Examples
This example shows how to globally enable the IGMP snooping querier feature:
Switch(config)# ip igmp snooping querierThis example shows how to set the IGMP snooping querier maximum response time to 25 seconds:
Switch(config)# ip igmp snooping querier max-response-time 25This example shows how to set the IGMP snooping querier interval time to 60 seconds:
Switch(config)# ip igmp snooping querier query-interval 60This example shows how to set the IGMP snooping querier TCN query count to 25:
Switch(config)# ip igmp snooping querier tcn count 25This example shows how to set the IGMP snooping querier timeout to 60 seconds:
Switch(config)# ip igmp snooping querier timeout expiry 60This example shows how to set the IGMP snooping querier feature to version 2:
Switch(config)# ip igmp snooping querier version 2You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
Command
Description
Enables IGMP report suppression
Displays IGMP snooping configurations
Displays the IGMP snooping multicast table
ip igmp snooping report-suppression
Use the ip igmp snooping report-suppression global configuration command on the switch stack or on a standalone switch to enable Internet Group Management Protocol (IGMP) report suppression. Use the no form of this command to disable IGMP report suppression and to forward all IGMP reports to multicast routers.
Command History
Usage Guidelines
IGMP report suppression is supported only when the multicast query has IGMPv1 and IGMPv2 reports. This feature is not supported when the query includes IGMPv3 reports.
The switch uses IGMP report suppression to forward only one IGMP report per multicast router query to multicast devices. When IGMP router suppression is enabled (the default), the switch sends the first IGMP report from all hosts for a group to all the multicast routers. The switch does not send the remaining IGMP reports for the group to the multicast routers. This feature prevents duplicate reports from being sent to the multicast devices.
If the multicast router query includes requests only for IGMPv1 and IGMPv2 reports, the switch forwards only the first IGMPv1 or IGMPv2 report from all hosts for a group to all the multicast routers. If the multicast router query also includes requests for IGMPv3 reports, the switch forwards all IGMPv1, IGMPv2, and IGMPv3 reports for a group to the multicast devices.
If you disable IGMP report suppression by entering the no ip igmp snooping report-suppression command, all IGMP reports are forwarded to all the multicast routers.
Related Commands
Command
Description
Displays IGMP snooping configurations
ip igmp snooping vlan mrouter
Use the ip igmp snooping mrouter global configuration command on the switch stack or on a standalone switch to add a multicast router port or to configure the multicast learning method. Use the no form of this command to return to the default settings.
ip igmp snooping vlan vlan-id mrouter { interface interface-id}
no ip igmp snooping vlan vlan-id mrouter { interface interface-id}
Syntax Description
vlan-id Enables IGMP snooping, and add the port in the specified VLAN as the multicast router port. The range is 1 to 1001 and 1006 to 4094.
interface interface-id Command History
Related Commands
Command
Description
Enables IGMP report suppression
Displays IGMP snooping configurations
Displays the IGMP snooping multicast table
Displays the IGMP snooping multicast router ports
Displays the configuration and operation information for the IGMP querier
ip igmp snooping vlan static
Use the ip igmp snooping static global configuration command on the switch stack or on a standalone switch to enable Internet Group Management Protocol (IGMP) snooping and to statically add a Layer 2 port as a member of a multicast group. Use the no form of this command to remove ports specified as members of a static multicast group.
ip igmp snooping vlan vlan-id static ip-address interface interface-id
no ip igmp snooping vlan vlan-id static ip-address interface interface-id
Syntax Description
vlan-id Enables IGMP snooping on the specified VLAN. The range is 1 to 1001 and 1006 to 4094.
ip-address Add a Layer 2 port as a member of a multicast group with the specified group IP address.
interface interface-id Command Default
By default, there are no ports statically configured as members of a multicast group.
Command History
Usage Guidelines
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
The configuration is saved in NVRAM.
Examples
Example
This example shows how to statically configure a host on an interface:
Switch(config)# ip igmp snooping vlan 1 static 200.000.000.000 interface gigabitEthernet1/0/1 Configuring port gigabitethernet1/0/1 on group 200.000.000.000You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Related Commands
Command
Description
Enables IGMP report suppression
Displays IGMP snooping configurations
Displays the IGMP snooping multicast table
Displays the IGMP snooping multicast router ports
Displays the configuration and operation information for the IGMP querier
ip multicast auto-enable
ip multicast vlan
ip pim accept-register
To configure a candidate rendezvous point (RP) switch to filter Protocol Independent Multicast (PIM) register messages, use the ip pim accept-register command in global configuration mode. To disable this function, use the no form of this command.
ip pim [ vrf vrf-name ] accept-register [ list access-list ]
no ip pim [ vrf vrf-name ] accept-register [ list access-list ]
Syntax Description
vrf vrf-name (Optional) Configures a PIM register filter on candidate RPs for (S, G) traffic associated with the multicast Virtual Private Network (VPN) routing and forwarding (MVRF) instance specified for the vrf-name argument.
list access-list Specifies the access-list argument as a number or name that defines the (S, G) traffic in PIM register messages to be permitted or denied. The range is 100 to 199 and an expanded range of 2000 to 2699. An IP named access list can also be used.
Command History
Usage Guidelines
Use this command to prevent unauthorized sources from registering with the RP. If an unauthorized source sends a register message to the RP, the RP will immediately send back a register-stop message.
The access list provided for the ip pim accept-register command should only filter on IP source addresses and IP destination addresses. Filtering on other fields (for example, IP protocol or UDP port number) will not be effective and may cause undesired traffic to be forwarded from the RP down the shared tree to multicast group members. If more complex filtering is desired, use the ip multicast boundary command instead.
Examples
Example
The following example shows how to permit register packets for any source address sending to any group range, with the exception of source address 172.16.10.1 sending to the SSM group range (232.0.0.0/8). These are denied. These statements should be configured on all candidate RPs because candidate RPs will receive PIM registers from first hop routers or switches.
Switch(config)# ip pim accept-register list ssm-range Switch(config)# ip access-list extended ssm-range Switch(config-ext-nacl)# deny ip any 232.0.0.0 0.255.255.255 Switch(config-ext-nacl)# permit ip any anyip pim bsr-candidate
Use the ip pim bsr-candidate command to configure the switch to be a candidate BSR. Run this command in global configuration mode. To remove the switch as a candidate BSR, use the no form of this command.
ip pim [ vrf vrf-name] bsr-candidate interface-id hash-mask-length [ priority]
no ip pim [ vrf vrf-name] bsr-candidate interface-id hash-mask-length [ priority]
Syntax Description
vrf vrf-name (Optional) Configures the switch to be a candidate BSR for the Multicast Virtual Private Network (MVPN) routing and forwarding (MVRF) instance specified for the vrf-name argument.
interface-id ID of the interface on this switch from which the BSR address is derived to make it a candidate. This interface must be enabled for Protocol Independent Multicast (PIM) using the ip pim command. Valid interfaces include physical ports, port channels, and VLANs.
hash-mask-length (Optional) Length of a mask (32 bits maximum) that is to be ANDed with the group address before the PIMv2 hash function is called. All groups with the same seed hash correspond to the same rendezvous point ( RP). For example, if this value is 24, only the first 24 bits of the group addresses matter. The hash mask length allows one RP to be used for multiple groups. The default hash mask length is 0.
priority (Optional) Priority of the candidate BSR (C-BSR). The range is from 0 to 255. The default priority is 0. The C-BSR with the highest priority value is preferred.
Command History
Usage Guidelines
The interface specified for this command must be enabled for Protocol Independent Multicast (PIM) using the ip pim command.
This command configures the switch to send BSR messages to all its PIM neighbors, with the address of the designated interface as the BSR address.
This command should be configured on backbone switches that have good connectivity to all parts of the PIM domain.
The BSR mechanism is specified in RFC 2362. Candidate RP (C-RP) switches unicast C-RP advertisement packets to the BSR. The BSR then aggregates these advertisements in BSR messages, which it regularly multicasts with a TTL of 1 to the ALL-PIM-ROUTERS group address, 224.0.0.13. The multicasting of these messages is handled by hop-by-hop RPF flooding; so no preexisting IP multicast routing setup is required (unlike with AutoRP). In addition, the BSR does not preselect the designated RP for a particular group range (unlike AutoRP); instead, each switch that receives BSR messages will elect RPs for group ranges based on the information in the BSR messages.
Cisco switches always accept and process BSR messages. There is no command to disable this function.
Cisco switches perform the following steps to determine which C-RP is used for a group:
- A longest match lookup is performed on the group prefix that is announced by the BSR C-RPs.
- If more than one BSR-learned C-RP are found by the longest match lookup, the C-RP with the lowest priority (configured with the ip pim rp-candidate command) is preferred.
- If more than one BSR-learned C-RP have the same priority, the BSR hash function is used to select the RP for a group.
- If more than one BSR-learned C-RP return the same hash value derived from the BSR hash function., the BSR C-RP with the highest IP address is preferred.
Related Commands
Command
Description
Configures the switch to advertise itself to the BSR as PIM C-RP
ip pim rp-candidate
Use the ip pim rp-candidate command to configure the switch to advertise itself to the BSR as a Protocol Independent Multicast (PIM) Version 2 (PIMv2) candidate rendezvous point (C-RP). Run this command in global configuration mode. To remove this switch as a C-RP, use the no form of this command.
ip pim [ vrf vrf-name] rp-candidate interface-id [ group-list access-list-number]
no ip pim [ vrf vrf-name] rp-candidate interface-id [ group-list access-list-number]
Syntax Description
vrf vrf-name (Optional) Configures the switch to advertise itself to the BSR as PIMv2 C-RP for the Multicast Virtual Private Network (MVPN) routing and forwarding (MVRF) instance specified for the vrf-name argument.
interface-id ID of the interface whose associated IP address is advertised as a candidate RP address. Valid interfaces include physical ports, port channels, and VLANs.
group-list access-list-number (Optional) Specifies the standard IP access list number that defines the group prefixes that are advertised in association with the RP address.
Command History
Usage Guidelines
Use this command to configure the switch to send PIMv2 messages so that it advertises itself as a candidate RP to the BSR.
This command should be configured on backbone switches that have good connectivity to all parts of the PIM domain.
The IP address associated with the interface specified by interface-id will be advertised as the C-RP address.
The interface specified for this command must be enabled for Protocol Independent Multicast (PIM) using the ip pim command.
If the optional group-list keyword and access-list-number argument are configured, the group prefixes defined by the standard IP access list will also be advertised in association with the RP address.
Examples
Example
The following example shows how to configure the switch to advertise itself as a C-RP to the BSR in its PIM domain. The standard access list number 4 specifies the group prefix associated with the RP that has the address identified by Gigabit Ethernet interface 1/0/1.
Switch(config)# ip pim rp-candidate GigabitEthernet1/0/1 group-list 4
Related Commands
Command
Description
Configures a switch to be a candidate BSR
ip pim send-rp-announce
Use the ip pim send-rp-announce command in global configuration mode to use Auto-RP to configure groups for which the switch will act as a rendezvous point (RP). To unconfigure this switch as an RP, use the no form of this command.
ip pim [ vrf vrf-name] send-rp-announce interface-id scope ttl-value group-list access-list-number interval seconds
no ip pim [ vrf vrf-name] send-rp-announce interface-id
Syntax Description
vrf vrf-name (Optional) Uses Auto-RP to configure groups for which the switch will act as a rendezvous point (RP) for the vrf-name argument.
interface-id Enter the interface-id of the interface that identifies the RP address. Valid interfaces include physical ports, port channels, and VLANs.
scope ttl-value Specifies the time-to-live (TTL) value in hops that limits the number of Auto-RP announcements. Enter a hop count that is high enough so that the RP-announce messages reach all mapping agents in the network. There is no default setting. The range is 1 to 255.
group-list access-list-number (Optional) Specifies the standard IP access list number that defines the group prefixes that are advertised in association with the RP address. Enter an IP standard access list number from 1 to 99. If no access list is configured, the RP is used for all groups.
interval seconds (Optional) Specifies the interval between RP announcements in seconds. The total holdtime of the RP announcements is automatically set to three times the value of the interval. The default interval is 60 seconds. The range is 1 to 16383.
Command History
Usage Guidelines
Enter this command on the switch that you want to be an RP. When you are using Auto-RP to distribute group-to-RP mappings, this command causes the router to send an Auto-RP announcement message to the well-known group CISCO-RP-ANNOUNCE (224.0.1.39). This message announces the router as a candidate RP for the groups in the range described by the access list.
Examples
Examples
The following example shows how to configure the switch to send RP announcements out all Protocol Independent Multicast (PIM)-enabled interfaces for a maximum of 31 hops. The IP address by which the switch wants to be identified as RP is the IP address associated with Gigabit Ethernet interface 1/0/1 at an interval of 120 seconds:
Switch(config)# ip pim send-rp-announce GigabitEthernet1/0/1 scope 31 group-list 5 interval 120
Related Commands
Command
Description
Configures the switch to advertise itself to the BSR as PIM C-RP
ip pim spt-threshold
Use the ip pim spt-threshold command to specify the threshold that must be reached before moving to shortest-path tree (spt). Run this command in global configuration mode. To remove the threshold, use the no form of this command.
ip pim { kbps | infinity} [ group-list access-list]
no ip pim { kbps | infinity} [ group-list access-list]
Syntax Description
kbps 0 is the only valid entry even though the range is 0 to 4294967. A 0 entry always switches to the source-tree.
infinity All sources for the specified group use the shared tree, never switching to the source tree.
group-list access-list (Optional) For access-list, specify an access list number or a specific access list you have created by name. If the value is 0 or if the group-list option is not used, the threshold applies to all groups.
Command History
mrinfo
Use the mrinfo command in user EXEC or privileged EXEC mode to query which neighboring multicast routers or multilayer switches are acting as peers.
Syntax Description
hostname | address (Optional) The Domain Name System (DNS) name or IP address of the multicast router or multilayer switch to query. If omitted, the switch queries itself.
vrf route-name Specifies the VPN routing or forwarding instance.
Command History
Usage Guidelines
The mrinfo command is the original tool of the multicast backbone (MBONE) to determine which neighboring multicast routers or switches are peering with multicast routers or switches. Cisco routers have supported responding to mrinfo requests since Cisco IOS Release 10.2.
You can query a multicast router or multilayer switch using the mrinfo command. The output format is identical to the multicast routed version of the Distance Vector Multicast Routing Protocol (DVMRP). (The mrouted software is the UNIX software that implements DVMRP.)
Examples
Example
The following is sample output from the mrinfo command:
Switch# mrinfo vrf 192.0.1.0 192.31.7.37 (barrnet-gw.cisco.com) [version cisco 11.1] [flags: PMSA]: 192.31.7.37 -> 192.31.7.34 (sj-wall-2.cisco.com) [1/0/pim] 192.31.7.37 -> 192.31.7.47 (dirtylab-gw-2.cisco.com) [1/0/pim] 192.31.7.37 -> 192.31.7.44 (dirtylab-gw-1.cisco.com) [1/0/pim]
Noteshow ip igmp filter
show ip igmp profile
To display all configured Internet Group Management Protocol (IGMP) profiles or a specified IGMP profile, use the show ip igmp profile privileged EXEC command.
Syntax Description
vrf vrf-name (Optional) Supports the multicast VPN routing and forwarding (VRF) instance.
profile number (Optional) The IGMP profile number to be displayed. The range is 1 to 4294967295. If no profile number is entered, all IGMP profiles are displayed.
Command History
Examples
Examples
The following example shows the output of the show ip igmp profile privileged EXEC command for Profile Number 40 on the switch:
Switch# show ip igmp profile 40 IGMP Profile 40 permit range 233.1.1.1 233.255.255.255This example shows the output of the show ip igmp profile privileged EXEC command for all profiles configured on the switch:
Switch# show ip igmp profile IGMP Profile 3 range 230.9.9.0 230.9.9.0 IGMP Profile 4 permit range 229.9.9.0 229.255.255.255
Related Commands
Command
Description
configures and enters IGMP Filter Profile configuration mode
show ip igmp snooping
To display the Internet Group Management Protocol (IGMP) snooping configuration of the switch or the VLAN, use the show ip igmp snooping command in user or privileged EXEC command mode.
show ip igmp snooping [ groups | mrouter | querier] [ vlan vlan-id] [ | { begin | exclude | include} expression]
Syntax Description
groups (Optional) See the show ip igmp snooping groups command (listed in Related Commands).
mrouter (Optional) See the show ip igmp snooping mrouter command (listed in Related Commands).
querier (Optional) See the show ip igmp snooping querier command (listed in Related Commands).
vlan vlan-id (Optional) Specify a VLAN; the range is 1 to 1001 and 1006 to 4094.
begin (Optional) Display begins with the line that contains text that matches expression.
exclude (Optional) Display excludes lines that contain text that matches expression.
include (Optional) Display includes only the lines that contain text that matches expression.
expression Expression in the output to use as a reference point.
Command History
Usage Guidelines
Use this command to display snooping configuration for the switch or for a specific VLAN.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
Examples
This is an example of output from the show ip igmp snooping vlan 1 command. It shows snooping characteristics for a specific VLAN:
Switch# show ip igmp snooping vlan 1 Global IGMP Snooping configuration: ------------------------------------------- IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Enabled TCN solicit query : Disabled TCN flood query count : 2 Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 1: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000This is an example of output from the show ip igmp snooping command. It displays snooping characteristics for all VLANs on the switch:
Switch# show ip igmp snooping Global IGMP Snooping configuration: ------------------------------------------- IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Enabled TCN solicit query : Disabled TCN flood query count : 2 Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 1: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 2: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 <output truncated>
Related Commands
Command
Description
Enables IGMP snooping
Displays the IGMP snooping multicast table
Displays the IGMP snooping multicast router ports
Displays the configuration and operation information for the IGMP querier
show ip igmp snooping groups
Use the show ip igmp snooping groups privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping multicast table for the switch or the multicast information. Use with the vlan keyword to display the multicast table for a specified multicast VLAN or specific multicast information.
Syntax Description
vlan vlan-id (Optional) Specify a VLAN; the range is 1 to 1001 and 1006 to 4094.
ip_address (Optional) Display characteristics of the multicast group with the specified group IP address.
count (Optional) Display the total number of entries for the specified command options instead of the actual entries.
Command History
Usage Guidelines
Use this command to display multicast information or the multicast table.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
Examples
This is an example of output from the show ip igmp snooping groups command without any keywords. It displays the multicast table for the switch:
Switch# show ip igmp snooping groups Vlan Group Type Version Port List ------------------------------------------------------------- 1 224.1.4.4 igmp Gi1/0/11 1 224.1.4.5 igmp Gi1/0/11 2 224.0.1.40 igmp v2 Gi1/0/15 104 224.1.4.2 igmp v2 Gi2/0/1, Gi2/0/2 104 224.1.4.3 igmp v2 Gi2/0/1, Gi2/0/2This is an example of output from the show ip igmp snooping groups count command. It displays the total number of multicast groups on the switch:
Switch# show ip igmp snooping groups count Total number of multicast groups: 2This is an example of output from the show ip igmp snooping groups vlan vlan-id ip-address command. It shows the entries for the group with the specified IP address:
Switch# show ip igmp snooping groups vlan 104 224.1.4.2 Vlan Group Type Version Port List ------------------------------------------------------------- 104 224.1.4.2 igmp v2 Gi2/0/1, Gi1/0/15
Related Commands
Command
Description
Enables IGMP snooping
Displays IGMP snooping configurations
show ip igmp snooping igmpv2-tracking
To display group and ip address entries, use the show ip igmp snooping igmpv2-tracking command in privileged EXEC mode.
Note
Command will display group and ip address entries only for wireless multicast igmp joins and not for wired joins. Also, this command displays output only if wireless Multicast is enabled.Command History
show ip igmp snooping mrouter
Use the show ip igmp snooping mrouter privileged EXEC command to display the Internet Group Management Protocol (IGMP) snooping dynamically learned and manually configured multicast router ports for the switch or for the specified multicast VLAN.
Syntax Description
vlan vlan-id (Optional) Specify a VLAN; the range is 1 to 1001 and 1006 to 4094.
begin (Optional) Display begins with the line that contains text that matches expression.
exclude (Optional) Display excludes lines that contain text that matches expression.
include (Optional) Display includes only the lines that contain text that matches expression.
expression Expression in the output to use as a reference point.
Command History
Usage Guidelines
Use this command to display multicast router ports on the switch or for a specific VLAN.
VLAN IDs 1002 to 1005 are reserved for Token Ring and FDDI VLANs and cannot be used in IGMP snooping.
When multicast VLAN registration (MVR) is enabled, the show ip igmp snooping mrouter command displays MVR multicast router information and IGMP snooping information.
Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Related Commands
Command
Description
Enables IGMP snooping
Displays IGMP snooping configurations
Displays the IGMP snooping multicast table
show ip igmp snooping querier
Use the show ip igmp snooping querier user EXEC command to display the configuration and operation information for the IGMP querier configured on a switch.
show ip igmp snooping querier [ detail | vlan vlan-id [ detail ] ] [ | { begin | exclude | include} expression]
Syntax Description
detail (Optional) Display detailed IGMP querier information.
vlan vlan-id (Optional) Specify a VLAN; the range is 1 to 1001 and 1006 to 4094. Use the detail keyword to display detailed information.
begin (Optional) Display begins with the line that contains text that matches expression.
exclude (Optional) Display excludes lines that contain text that matches expression.
include (Optional) Display includes only the lines that contain text that matches expression.
expression Expression in the output to use as a reference point.
Command History
Usage Guidelines
Use the show ip igmp snooping querier command to display the IGMP version and the IP address of a detected device, also called a querier, that sends IGMP query messages. A subnet can have multiple multicast routers but has only one IGMP querier. In a subnet running IGMPv2, one of the multicast routers is elected as the querier. The querier can be a Layer 3 switch.
The show ip igmp snooping querier command output also shows the VLAN and the interface on which the querier was detected. If the querier is the switch, the output shows the Port field as Router. If the querier is a router, the output shows the port number on which the querier is learned in the Port field.
The show ip igmp snooping querier detail user EXEC command is similar to the show ip igmp snooping querier command. However, the show ip igmp snooping querier command displays only the device IP address most recently detected by the switch querier.
The show ip igmp snooping querier detail command displays the device IP address most recently detected by the switch querier and this additional information:Expressions are case sensitive. For example, if you enter | exclude output, the lines that contain output do not appear, but the lines that contain Output appear.
Examples
Examples
This is an example of output from the show ip igmp snooping querier command:
Switch> show ip igmp snooping querier Vlan IP Address IGMP Version Port --------------------------------------------------- 1 172.20.50.11 v3 Gi1/0/1 2 172.20.40.20 v2 RouterThis is an example of output from the show ip igmp snooping querier detail command:
Switch> show ip igmp snooping querier detail Vlan IP Address IGMP Version Port ------------------------------------------------------------- 1 1.1.1.1 v2 Fa8/0/1 Global IGMP switch querier status -------------------------------------------------------- admin state : Enabled admin version : 2 source IP address : 0.0.0.0 query-interval (sec) : 60 max-response-time (sec) : 10 querier-timeout (sec) : 120 tcn query count : 2 tcn query interval (sec) : 10 Vlan 1: IGMP switch querier status -------------------------------------------------------- elected querier is 1.1.1.1 on port Fa8/0/1 -------------------------------------------------------- admin state : Enabled admin version : 2 source IP address : 10.1.1.65 query-interval (sec) : 60 max-response-time (sec) : 10 querier-timeout (sec) : 120 tcn query count : 2 tcn query interval (sec) : 10 operational state : Non-Querier operational version : 2 tcn query pending count : 0
Related Commands
Command
Description
Enables IGMP snooping
Globally enables the IGMP querier function
Displays IGMP snooping configurations
show ip igmp snooping wireless mcast-spi-count
show ip igmp snooping wireless mgid
To display multicast group ID (MGID) mappings, use the show ip igmp snooping wireless mgid command in privileged EXEC mode.
Command History
Examples
Examples
This is an example of output from the show ip igmp snooping wireless mgid command.
Switch# show ip igmp snooping wireless mgid Total number of L2-MGIDs = 0 Total number of MCAST MGIDs = 0 Wireless multicast is Enabled in the system Vlan bcast nonip-mcast mcast mgid Stdby Flags 1 Disabled Disabled Enabled Disabled 0:0:1:0 25 Disabled Disabled Enabled Disabled 0:0:1:0 34 Disabled Disabled Enabled Disabled 0:0:1:0 200 Disabled Disabled Enabled Disabled 0:0:1:0 1002 Enabled Enabled Enabled Disabled 0:0:1:0 1003 Enabled Enabled Enabled Disabled 0:0:1:0 1004 Enabled Enabled Enabled Disabled 0:0:1:0 1005 Enabled Enabled Enabled Disabled 0:0:1:0 Index MGID (S, G, V) --------------------------------------------------------show ip pim all-vrfs tunnel
To display information about the Protocol Independent Multicast (PIM) register encapsulation and de-encapsulation tunnels for all VRFs, use the show ip pim all-vrfs tunnel command in privileged EXEC mode.
Syntax Description
verbose (Optional) Provides additional information, such as the MAC encapsulation header and platform-specific information.
Tunnel tunnel-interface-number (Optional) Displays tunnel information for a specific tunnel interface specified by tunnel-interface-number .
Command History
Usage Guidelines
If you use the show ip pim all-vrfs tunnel command without the optional keywords, information about the PIM register encapsulation and de-encapsulation tunnel interfaces for all VRFs is displayed.
The PIM encapsulation tunnel is the register tunnel. An encapsulation tunnel is created for every known rendezvous point (RP) on every switch. The PIM decapsulation tunnel is the register decapsulation tunnel. A decapsulation tunnel is created on the RP for the address that is configured to be the RP address.
show ip pim autorp
show ip pim bsr-router
To display information related to Protocol Independent Multicast (PIM) bootstrap router (BSR) protocol processing, use the show ip pim bsr-router command in user EXEC or privileged EXEC mode. Like auto-rp, the BSR RP method can be configured. Once the BSR RP method is configured, running this command will display the BSR router information.
Command History
Examples
The following is sample output from the show ip pim bsr-router command:
Switch# show ip pim bsr-router PIMv2 Bootstrap information This system is the Bootstrap Router (BSR) BSR address: 172.16.143.28 Uptime: 04:37:59, BSR Priority: 4, Hash mask length: 30 Next bootstrap message in 00:00:03 seconds Next Cand_RP_advertisement in 00:00:03 seconds. RP: 172.16.143.28(Ethernet0), Group acl: 6show ip pim bsr
To display information related to Protocol Independent Multicast (PIM) bootstrap router (BSR) protocol processing, use the show ip pim bsr command in user EXEC or privileged EXEC mode. Like auto-rp, the BSR RP method can be configured. Once the BSR RP method is configured, running this command will display the BSR router information.
Command History
Examples
The following is sample output from the show ip pim bsr command:
Switch# show ip pim bsr PIMv2 Bootstrap information This system is the Bootstrap Router (BSR) BSR address: 172.16.143.28 Uptime: 04:37:59, BSR Priority: 4, Hash mask length: 30 Next bootstrap message in 00:00:03 seconds Next Cand_RP_advertisement in 00:00:03 seconds. RP: 172.16.143.28(Ethernet0), Group acl: 6show ip pim tunnel
To display information about the Protocol Independent Multicast (PIM) register encapsulation and de-encapsulation tunnels on an interface, use the show ip pim tunnel command.
Syntax Description
vrf vrf-name (Optional) Specifies a virtual routing and forwarding (VRF) configuration.
Tunnel interface-number (Optional) Tunnel interface-number .
verbose (Optional) Provides additional information, such as the MAC encapsulation header and platform-specific information.
Command History
Usage Guidelines
Use the show ip pim tunnel to display information about PIM tunnel interfaces.
PIM tunnel interfaces are used by the IPv4 Multicast Forwarding Information Base (MFIB) for the PIM sparse mode (PIM-SM) registration process. Two types of PIM tunnel interfaces are used by the the IPv4 MFIB:
The PIM Encap Tunnel is dynamically created whenever a group-to-Rendezvous Point (RP) mapping is learned (via Auto-RP, bootstrap router (BSR), or static RP configuration). The PIM Encap Tunnel is used to encapsulate multicast packets sent by first-hop Designated Routers (DRs) that have directly connected sources.
Similar to the PIM Encap Tunnel, the PIM Decap Tunnel interface is dynamically created—with the exception that it is created only on the RP whenever a group-to-RP mapping is learned. The PIM Decap Tunnel interface is used by the RP to decapsulate PIM register messages.
Note
PIM tunnels will not appear in the running configuration.The following syslog message will appear when a PIM tunnel interface is created:
* %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel<interface_number>, changed state to upExamples
The following is sample output from the show ip pim tunnel taken from a RP. The output is used to verify the PIM Encap and Decap Tunnel on the RP:
Switch# show ip pim tunnel Tunnel0 Type : PIM Encap RP : 70.70.70.1* Source: 70.70.70.1 Tunnel1* Type : PIM Decap RP : 70.70.70.1* Source: -R2#
Note
The asterisk (*) indicates that the router is the RP. The RP will always have a PIM Encap and Decap Tunnel interface.show platform ip multicast
To display platform-dependent IP multicast tables and other information, use the show platform ip multicast privileged EXEC command.
show platform ip multicast { acl-full-info | | counters | | groups | | hardware [detail] | interfaces | | locks | | mdfs-routes | | mroute-retry | | retry | | trace }
Syntax Description
acl-full-info
Displays IP multicast routing access-control list (ACL) information, in particular the number of outgoing VLANs for which router ACLs at the output cannot be applied in hardware.
counters
Displays IP multicast counters and statistics.
groups
Displays IP multicast routes per group.
hardware [detail]
Displays IP multicast routes loaded into hardware. The optional detail keyword is used to show port members in the destination index and route index.
interfaces
Displays IP multicast interfaces.
locks
Displays IP multicast destination-index locks.
mdfs-routes
Displays multicast distributed fast switching (MDFS) IP multicast routes.
mroute-retry
Displays the IP multicast route retry queue.
retry
Displays the IP multicast routes in the retry queue.
trace
Displays the IP multicast trace buffer.
Command History
show wireless multicast
To display wireless multicast information, use the show wireless multicast command in privileged EXEC mode.
show wireless multicast [ source source-ip group group-ip vlan vlan-id | group group-ip vlan vlan-id]
Syntax Description
source source-ip (Optional) Specifies the source IPv4/IPv6 Address of multicast traffic.
group group-ip vlan vlan-id (Optional) Specifies the destination group and group IP of mutlicast traffic and displays the client information on VLAN with the specific VLAN ID.
Command History
Examples
This example shows how to display the wireless multicast information.
Switch# show wireless multicast Multicast : Enabled AP Capwap Multicast : Unicast Wireless Broadcast : Disabled Wireless Multicast non-ip-mcast : Disabled Vlan Non-ip-mcast Broadcast MGID ------------------------------------------------------ 1 Enabled Enabled Enabled 2 Enabled Enabled Disabled 94 Enabled Enabled Disabled
