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vppcfg/docs/config-guide.md
Pim van Pelt 15daa65c0b Add bridgedomain config structure
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A VPP Configuration Utility

Configuration Guide

vppcfg consumes YAML files of a specific format. Their validity is asserted by two main types of validation:

  1. syntax checks are performed by Yamale and this ensures that all fields in the YAML file are correctly formed, that field-names are correctly spelled, that no extra fields are given, and their values are of the correct type.
  2. semantic validations are performed to ensure that configurations are safely applyable to a running VPP. Note: Some semantic checks are stricter than VPP, because applying them may leave the dataplane in a non-recoverable state.

For the curious, the Yamale syntax validation lives in this schema.

Basic structure

The YAML configuration file has the following structure, consisting of several maps of a given object type, which specify names of those objects:

loopbacks:
  loop0:
    [ Loopback Configuration ]

bondethernets:
  BondEthernet0:
    [ BondEthernet (bond) Configuration ]

vxlan_tunnels:
  vxlan_tunnel0:
    [ VXLAN (tunnel) Configuration ]

bridgedomains:
  bd1:
    [ BridgeDomain Configuration ]

interfaces:
  GigabitEthernet3/0/0:
    [ Interface Configuration ]
  BondEthernet0:
    [ BondEthernet (interface) Configuration ]
  vxlan_tunnel0:
    [ VXLAN (interface) Configuration ]

Object names are strictly enforced, they must be unique in their scope, and they are case sensitive. For example, any loopback MUST be named loopN, and any bondethernet MUST be named BondEthernetN (note here the camel case). A distinction is made between the object and the resulting interface: A BondEthernet occurs twice in the configuration. The first time, in the bondethernets section, the bond configuration is specified. That bond configuration yields an interface in VPP named BondEthernetN, which occurs in the interfaces section where it can then be manipulated like any other interface (eg. have IP addresses, Linux Control Plane names, sub-interfaces and so on). The same is true for VXLAN tunnels, the only currently supported tunnel type.

Loopbacks

Loopbacks are required to be named loopN where N in [0,4096). The configuration allows the following fields:

  • description: A string, no longer than 64 characters, and excluding the single quote ' and double quote ". This string is currently not used anywhere, and serves for enduser documentation purposes.
  • lcp: A Linux Control Plane interface pair LIP. If specified, the loopback will be presented in Linux under this name. Its name may be at most 15 characters long, and match the regular expression [a-z]+[a-z0-9-]*.
  • mtu: An integer value between [128,9216], noting the (packet) MTU of the loopback. It will default to 1500 if not specified.
  • addresses: A list of between one and six IPv4 or IPv6 addresses including prefixlen in CIDR format. VPP requires IP addresses to be unique in the entire dataplane, with one notable exception: Multiple IP addresses in the same prefix/len can be added on one and the same interface.

Although VPP would allow it, vppcfg does not allow for loopbacks to have sub-interfaces.

Examples:

loopbacks:
  loop0:
    description: "loopback with default 1500 byte MTU"
    lcp: lo0
    addresses: [ 10.0.0.1/32, 2001:db8::1/128 ]
  loop1:
    lcp: bvi1
    mtu: 9000
    addresses: [ 10.0.1.1/24, 10.0.1.2/24, 2001:db8:1::1/64 ]

Bridge Domains

BridgeDomains are required to be named bdN where N in [1, 16777216). Note that bridgedomain bd0 is reserved and cannot be used. The configuration allows the following fields:

  • description: A string, no longer than 64 characters, and excluding the single quote ' and double quote ". This string is currently not used anywhere, and serves for enduser documentation purposes.
  • mtu: An integer value between [128,9216], noting the (packet) MTU of the bridgedomain. It will default to 1500 if not specified. All member interfaces, including the BVI, are required to have the same MTU as their bridge.
  • bvi: An optional bridge virtual interface (sometimes also referred to as an IRB) which refers to an existing loopback interface by name (ie loop0).
  • interfaces: A list of zero or more interfaces or sub-interfaces that are bridge members. If the bridge has a BVI, it MUST NOT appear in this list. Bridges are allowed to exist with no member interfaces.

Any member sub-interfaces that are added, will automatically be configured to tag-rewrite the number of tags they have, so a simple dot1q sub-interface will be configured as pop 1, while a QinQ or QinAD sub-interface will be configured as pop 2. Conversely, when interfaces are removed from the bridge, their tag-rewriting will be disabled.

Examples:

bridgedomains:
  bd10:
    mtu: 2000
    bvi: loop1
    interfaces: [ BondEthernet0.500, HundredGigabitEthernet12/0/1, vxlan_tunnel1 ]
  bd11:
    description: "No member interfaces, default 1500 byte MTU"

BondEthernets

Interfaces

VXLAN Tunnels