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Diffstat (limited to 'docs/interfaces/vxlan.rst')
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1 files changed, 107 insertions, 102 deletions
diff --git a/docs/interfaces/vxlan.rst b/docs/interfaces/vxlan.rst index e597e167..67dab820 100644 --- a/docs/interfaces/vxlan.rst +++ b/docs/interfaces/vxlan.rst @@ -1,7 +1,8 @@ .. _vxlan-interface: +##### VXLAN ------ +##### :abbr:`VXLAN (Virtual Extensible LAN)` is a network virtualization technology that attempts to address the scalability problems associated with large cloud @@ -32,12 +33,102 @@ may be blocked by the hypervisor. for VXLAN, VyOS uses a default port of 8472. You can change the port on a per VXLAN interface basis to get it working accross multiple vendors. -Multicast VXLAN -^^^^^^^^^^^^^^^^ +Configuration +============= + +Address +------- + +.. cfgcmd:: set interfaces vxlan <interface> address <address> + + Configure VXLAN interface `<interface>` with one or more interface + addresses. Address can be specified multiple times as IPv4 and/or IPv6 + address, e.g. 192.0.2.1/24 and/or 2001:db8::1/64 + + Example: + + .. code-block:: none + + set interfaces vxlan vxlan0 address 192.0.2.1/24 + set interfaces vxlan vxlan0 address 192.0.2.2/24 + set interfaces vxlan vxlan0 address 2001:db8::ffff/64 + set interfaces vxlan vxlan0 address 2001:db8:100::ffff/64 + + +.. cfgcmd:: set interfaces vxlan <interface> ipv6 address autoconf + + .. include:: common-ipv6-addr-autoconf.txt + +.. cfgcmd:: set interfaces vxlan <interface> ipv6 address eui64 <prefix> + + :abbr:`EUI-64 (64-Bit Extended Unique Identifier)` as specified in + :rfc:`4291` allows a host to assign iteslf a unique 64-Bit IPv6 address. + + .. code-block:: none + + set interfaces vxlan vxlan0 ipv6 address eui64 2001:db8:beef::/64 + + +.. cfgcmd:: set interfaces vxlan <interface> link <interface> + + Interface used for VXLAN underlay. This is mandatory when using VXLAN via + a multicast network. VXLAN traffic will always enter and exit this interface. + + +.. cfgcmd:: set interfaces vxlan <interface> group <address> + + Multicast group address for VXLAN interface. VXLAN tunnels can be built + either via Multicast or via Unicast. + + Both IPv4 and IPv6 multicast is possible. + + +.. cfgcmd:: set interfaces vxlan <interface> remote <address> + + IPv4/IPv6 remote address of the VXLAN tunnel. Alternative to multicast, the + remote IPv4/IPv6 address can set directly. + + +.. cfgcmd:: set interfaces vxlan <interface> port <port> + + Configure port number of remote VXLAN endpoint. -Example Topology: + .. note:: As VyOS is Linux based the default port used is not using 4789 + as the default IANA-assigned destination UDP port number. Instead VyOS + uses the Linux default port of 8472. -PC4 - Leaf2 - Spine1 - Leaf3 - PC5 + +.. cfgcmd:: set interfaces vxlan <interface> vni <number> + + Each VXLAN segment is identified through a 24-bit segment ID, termed the + :abbr:`VNI (VXLAN Network Identifier (or VXLAN Segment ID))`, This allows + up to 16M VXLAN segments to coexist within the same administrative domain. + + +Link Administration +------------------- + +.. cfgcmd:: set interfaces vxlan <interface> description <description> + + Assign given `<description>` to interface. Description will also be passed + to SNMP monitoring systems. + +.. cfgcmd:: set interfaces vxlan <interface> disable + + Disable given `<interface>`. It will be placed in administratively down + (``A/D``) state. + +.. cfgcmd:: set interfaces vxlan <interface> mtu <mtu> + + Configure :abbr:`MTU (Maximum Transmission Unit)` on given `<interface>`. It + is the size (in bytes) of the largest ethernet frame sent on this link. + MTU ranges from 1450 to 9000 bytes. For best performance you should have + a MTU > 1550 bytes on your underlay. + +Multicast VXLAN +=============== + +Topology: PC4 - Leaf2 - Spine1 - Leaf3 - PC5 PC4 has IP 10.0.0.4/24 and PC5 has IP 10.0.0.5/24, so they believe they are in the same broadcast domain. @@ -65,30 +156,10 @@ For optimal scalability Multicast shouldn't be used at all, but instead use BGP to signal all connected devices between leafs. Unfortunately, VyOS does not yet support this. -Configuration commands -^^^^^^^^^^^^^^^^^^^^^^ +Example +------- -.. code-block:: none - - interfaces - vxlan <vxlan[0-16777215]> - address # IP address of the VXLAN interface - description # Description - group <ipv4> # IPv4 Multicast group address (required) - ip # IPv4 routing options - ipv6 # IPv6 routing options - link <dev> # IP interface for underlay of this vxlan overlay (optional) - mtu # MTU - policy # Policy routing options - remote # Remote address of the VXLAN tunnel, used for PTP instead of multicast - vni <1-16777215> # Virtual Network Identifier (required) - -Configuration Example -^^^^^^^^^^^^^^^^^^^^^ - -The setup is this: - -Leaf2 - Spine1 - Leaf3 +The setup is this: Leaf2 - Spine1 - Leaf3 Spine1 is a Cisco IOS router running version 15.4, Leaf2 and Leaf3 is each a VyOS router running 1.2. @@ -111,7 +182,7 @@ Topology: Eth0 towards Spine1, IP-address 10.1.3.3/24 Eth1 towards a vlan-aware switch -Spine1 Configuration: +**Spine1 Configuration:** .. code-block:: none @@ -131,10 +202,10 @@ Spine1 Configuration: Multicast-routing is required for the leafs to forward traffic between each other in a more scalable way. This also requires PIM to be enabled towards the -Leafs so that the Spine can learn what multicast groups each Leaf expect traffic -from. +Leafs so that the Spine can learn what multicast groups each Leaf expect +traffic from. -Leaf2 configuration: +**Leaf2 configuration:** .. code-block:: none @@ -159,7 +230,7 @@ Leaf2 configuration: set interfaces vxlan vxlan242 link 'eth0' set interfaces vxlan vxlan242 vni '242' -Leaf3 configuration: +**Leaf3 configuration:** .. code-block:: none @@ -238,77 +309,11 @@ its pre-standard value of 8472 to preserve backwards compatibility. A configuration directive to support a user-specified destination port to override that behavior is available using the above command. -Older Examples -^^^^^^^^^^^^^^ - -Example for bridging normal L2 segment and vxlan overlay network, and using a -vxlan interface as routing interface. - -.. code-block:: none - - interfaces { - bridge br0 { - member { - interface vxlan0 { - } - } - } - ethernet eth0 { - address dhcp - } - loopback lo { - } - vxlan vxlan0 { - group 239.0.0.1 - vni 0 - } - vxlan vxlan1 { - address 192.168.0.1/24 - link eth0 - group 239.0.0.1 - vni 1 - } - } - -Here is a working configuration that creates a VXLAN between two routers. Each -router has a VLAN interface (26) facing the client devices and a VLAN interface -(30) that connects it to the other routers. With this configuration, traffic -can flow between both routers' VLAN 26, but can't escape since there is no L3 -gateway. You can add an IP to a bridge to create a gateway. - -.. code-block:: none - - interfaces { - bridge br0 { - member { - interface eth0.26 { - } - interface vxlan0 { - } - } - } - ethernet eth0 { - duplex auto - smp-affinity auto - speed auto - vif 30 { - address 10.7.50.6/24 - } - } - loopback lo { - } - vxlan vxlan0 { - group 239.0.0.241 - vni 241 - } - } - Unicast VXLAN -^^^^^^^^^^^^^ - -Alternative to multicast, the remote IPv4 address of the VXLAN tunnel can set directly. -Let's change the Multicast example from above: +============= +Alternative to multicast, the remote IPv4 address of the VXLAN tunnel can be +set directly. Let's change the Multicast example from above: .. code-block:: none |