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Add first stab approximation of the reconsiliation order

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Pim van Pelt
2022-03-23 17:11:34 +00:00
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@ -107,3 +107,67 @@ Fields:
an error is repeated N times, and it's good practice to precisely establish how many errors
should be expected. That said, this field can be empty or omitted.
## Reconsiling
The second important task of this utility is to take the wellformed (validated) configuration and
apply it to the VPP dataplane. The overall flow is this:
1. Prune phase (things in VPP that are not in the config), the order is:
1. Retrieve all LCP interfaces from VPP
* Starting with QinQ/QinAD, then Dot1Q/Dot1AD, then (BondEthernets, Tunnels, PHYs)
* Remove those that do not exist in the config
* Remove those that do exist in the config but are on a different phy
* Remove those that do exist in the config but have a different encapsulation
1. Retrieve all Loopbacks and BVIs from VPP
* Remove those that do not exist in the config
* Remove all IP addresses that are not in the config
1. Retrieve all Bridge Domains from VPP
* Remove those that do not exist in the config
* Remove all IP addresses that are not in the config
* Remove all member interfaces that are not in the config, return them to L3 mode
* Remove tag-rewrite options on member interfaces if they have encapsulation
1. For L2 Cross Connects from VPP
* For interfaces that do not exist in the config (either as source or target):
* Return the interface to L3 mode
* Remove tag-rewrite options on if it has encapsulation
1. Retrieve all BondEthernets from VPP
* Remove those that do not exist in the config
* Remove all member interfaces that are not in the config, return them to L3 mode
* Remove all IP addresses that are not in the config
1. Retrieve all Tunnels from VPP
* Remove those that do not exist in the config
* Remove all IP addresses that are not in the config
1. Retrieve all interfaces from VPP
* Starting with QinQ/QinAD, then Dot1Q/Dot1AD, then (BondEthernets, Tunnels):
* Remove those that do not exist in the config
* Remove those that do exist in the config but have a different encapsulation
* Remove all IP addresses that are not in the config
* And finally, for each PHY:
* Remove all IP addresses that are not in the config
* If not in the config, return to default (L3 mode, MTU 9000, admin-state down)
1. Create phase (things in the config that are not in VPP), the order is:
1. Loopbacks and BVIs
1. Bridge Domains
1. BondEthernets
1. Tunnels
1. Dot1Q and Dot1AD sub-interfaces
1. Qin1Q and Qin1AD sub-interfaces
1. LCP pairs
1. Sync phase, for each interface in the configuration
1. For BondEthernets:
* Set MTU of member interfaces
* Add them as slaves, lexicographically sorted by name
* Set their admin-state up
* Ensure LCP has the same MAC as the BondEthernet
1. For Bridge Domains:
* Set the MTU of the member interface (including BVI)
* Add the members (including the BVI)
* Set tag-rewrite options if any of the interfaces have encapsulation
1. For L2 Cross Connects, if applicable:
* Set the MTU of the two interfaces
* Set the L2XC option on both
* Set tag-rewrite options if any of the interfaces have encapsulation
1. Decrease MTU for QinQ/QinAD, then Dot1Q/Dot1AD, then (BondEthernets, Tunnels, PHYs)
1. Raise MTU for (PHYs, Tunnels, BondEthernets), then Dot1Q/Dot1AD, then QinQ/QinAD
1. Add IPv4/IPv6 addresses
1. Set admin state up