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authorChristian Breunig <christian@breunig.cc>2023-11-15 18:21:41 +0100
committerGitHub <noreply@github.com>2023-11-15 18:21:41 +0100
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tree7535f5f234d14367fb6c4c9f809fbe184a4c3122 /docs/configuration/protocols/igmp.rst
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Merge pull request #1151 from vyos/frr-pim-T5733
pim: igmp: T5733: adjust to latest CLI syntax
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-:lastproofread: 2023-01-27
-
-.. _multicast:
-
-#########
-Multicast
-#########
-
-VyOS facilitates IP Multicast by supporting **PIM Sparse Mode**,
-**IGMP** and **IGMP-Proxy**.
-
-************
-PIM and IGMP
-************
-
-PIM (Protocol Independent Multicast) must be configured in every
-interface of every participating router. Every router must also have the
-location of the Rendevouz Point manually configured. Then,
-unidirectional shared trees rooted at the Rendevouz Point will
-automatically be built for multicast distribution.
-
-Traffic from multicast sources will go to the Rendezvous Point, and
-receivers will pull it from a shared tree using IGMP (Internet Group
-Management Protocol).
-
-Multicast receivers will talk IGMP to their local router, so, besides
-having PIM configured in every router, IGMP must also be configured in
-any router where there could be a multicast receiver locally connected.
-
-VyOS supports both IGMP version 2 and version 3 (which allows
-source-specific multicast).
-
-
-Example
-=======
-
-In the following example we can see a basic multicast setup:
-
-.. image:: /_static/images/multicast-basic.png
- :width: 90%
- :align: center
- :alt: Network Topology Diagram
-
-
-
-**Router 1**
-
-.. code-block:: none
-
- set interfaces ethernet eth2 address '172.16.0.2/24'
- set interfaces ethernet eth1 address '100.64.0.1/24'
- set protocols ospf area 0 network '172.16.0.0/24'
- set protocols ospf area 0 network '100.64.0.0/24'
- set protocols igmp interface eth1
- set protocols pim interface eth1
- set protocols pim interface eth2
- set protocols pim rp address 172.16.255.1 group '224.0.0.0/4'
-
-**Router 3**
-
-.. code-block:: none
-
- set interfaces dummy dum0 address '172.16.255.1/24'
- set interfaces ethernet eth0 address '172.16.0.1/24'
- set interfaces ethernet eth1 address '172.16.1.1/24'
- set protocols ospf area 0 network '172.16.0.0/24'
- set protocols ospf area 0 network '172.16.255.0/24'
- set protocols ospf area 0 network '172.16.1.0/24'
- set protocols pim interface dum0
- set protocols pim interface eth0
- set protocols pim interface eth1
- set protocols pim rp address 172.16.255.1 group '224.0.0.0/4'
-
-**Router 2**
-
-.. code-block:: none
-
- set interfaces ethernet eth1 address '10.0.0.1/24'
- set interfaces ethernet eth2 address '172.16.1.2/24'
- set protocols ospf area 0 network '10.0.0.0/24'
- set protocols ospf area 0 network '172.16.1.0/24'
- set protocols pim interface eth1
- set protocols pim interface eth2
- set protocols pim rp address 172.16.255.1 group '224.0.0.0/4'
-
-
-
-
-
-Basic commands
-==============
-
-These are the commands for a basic setup.
-
-.. cfgcmd:: set protocols pim interface <interface-name>
-
- Use this command to enable PIM in the selected interface so that it
- can communicate with PIM neighbors.
-
-
-.. cfgcmd:: set protocols pim rp address <address> group
- <multicast-address/mask-bits>
-
- Use this command to manually configure a Rendezvous Point for PIM so
- that join messages can be sent there. Set the Rendevouz Point address
- and the matching prefix of group ranges covered. These values must
- be shared with every router participating in the PIM network.
-
-
-.. cfgcmd:: set protocols igmp interface eth1
-
- Use this command to configure an interface with IGMP so that PIM can
- receive IGMP reports and query on the selected interface. By default
- IGMP version 3 will be used.
-
-
-
-Tuning commands
-===============
-
-You can also tune multicast with the following commands.
-
-.. cfgcmd:: set protocols pim interface <interface> dr-priority <value>
-
- Use this PIM command in the selected interface to set the priority
- (1-4294967295) you want to influence in the election of a node to
- become the Designated Router for a LAN segment. The default priority
- is 1, set a higher value to give the router more preference in the
- DR election process.
-
-
-.. cfgcmd:: set protocols pim int <interface> hello <seconds>
-
- Use this command to configure the PIM hello interval in seconds
- (1-180) for the selected interface.
-
-
-.. cfgcmd:: set protocols pim rp keep-alive-timer <seconds>
-
- Use this PIM command to modify the time out value (31-60000
- seconds) for an `(S,G) <https://tools.ietf.org/html/rfc7761#section-4.1>`_
- flow. 31 seconds is chosen for a lower bound as some hardware
- platforms cannot see data flowing in better than 30 seconds chunks.
-
-
-.. cfgcmd:: set protocols igmp interface <interface> join <multicast-address>
- source <IP-address>
-
- Use this command to allow the selected interface to join a multicast
- group defining the multicast address you want to join and the source
- IP address too.
-
-
-.. cfgcmd:: set protocols igmp interface <interface> query-interval <seconds>
-
- Use this command to configure in the selected interface the IGMP
- host query interval (1-1800) in seconds that PIM will use.
-
-
-.. cfgcmd:: set protocols igmp interface <interface> query-max-response-time
- <deciseconds>
-
- Use this command to configure in the selected interface the IGMP
- query response timeout value (10-250) in deciseconds. If a report is
- not returned in the specified time, it will be assumed the `(S,G) or
- (*,G) state <https://tools.ietf.org/html/rfc7761#section-4.1>`_ has
- timed out.
-
-
-.. cfgcmd:: set protocols igmp interface <interface> version <version-number>
-
- Use this command to define in the selected interface whether you
- choose IGMP version 2 or 3. The default value is 3.
-
-
-
-**********
-IGMP Proxy
-**********
-
-:abbr:`IGMP (Internet Group Management Protocol)` proxy sends IGMP host messages
-on behalf of a connected client. The configuration must define one, and only one
-upstream interface, and one or more downstream interfaces.
-
-Configuration
-=============
-
-.. cfgcmd:: set protocols igmp-proxy interface <interface> role
- <upstream | downstream>
-
- * **upstream:** The upstream network interface is the outgoing interface
- which is responsible for communicating to available multicast data sources.
- There can only be one upstream interface.
-
- * **downstream:** Downstream network interfaces are the distribution
- interfaces to the destination networks, where multicast clients can join
- groups and receive multicast data. One or more downstream interfaces must
- be configured.
-
-.. cfgcmd:: set protocols igmp-proxy interface <interface> alt-subnet <network>
-
- Defines alternate sources for multicasting and IGMP data. The network address
- must be on the following format 'a.b.c.d/n'. By default, the router will
- accept data from sources on the same network as configured on an interface.
- If the multicast source lies on a remote network, one must define from where
- traffic should be accepted.
-
- This is especially useful for the upstream interface, since the source for
- multicast traffic is often from a remote location.
-
- This option can be supplied multiple times.
-
-.. cfgcmd:: set protocols igmp-proxy disable-quickleave
-
- Disables quickleave mode. In this mode the daemon will not send a Leave IGMP
- message upstream as soon as it receives a Leave message for any downstream
- interface. The daemon will not ask for Membership reports on the downstream
- interfaces, and if a report is received the group is not joined again the
- upstream.
-
- If it's vital that the daemon should act exactly like a real multicast client
- on the upstream interface, this function should be enabled.
-
- Enabling this function increases the risk of bandwidth saturation.
-
-.. cfgcmd:: set protocols igmp-proxy disable
-
- Disable this service.
-
-.. _igmp:proxy_example:
-
-Example
--------
-
-Interface `eth1` LAN is behind NAT. In order to subscribe `10.0.0.0/23` subnet
-multicast which is in `eth0` WAN we need to configure igmp-proxy.
-
-.. code-block:: none
-
- set protocols igmp-proxy interface eth0 role upstream
- set protocols igmp-proxy interface eth0 alt-subnet 10.0.0.0/23
- set protocols igmp-proxy interface eth1 role downstream
-
-Operation
-=========
-
-.. opcmd:: restart igmp-proxy
-
- Restart the IGMP proxy process.