Revert "Add incremental RST-to-MyST swap mechanism (sagitta) (#1868)" (#1894)

This reverts commit 22e34ce5aee24d2fd11f8205522ab7ecdb3c4c5e.

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-lastproofread  
-2021-06-30
-
-# High availability
-
-VRRP (Virtual Router Redundancy Protocol) provides active/backup redundancy for
-routers. Every VRRP router has a physical IP/IPv6 address, and a virtual
-address. On startup, routers elect the master, and the router with the highest
-priority becomes the master and assigns the virtual address to its interface.
-All routers with lower priorities become backup routers. The master then starts
-sending keepalive packets to notify other routers that it's available. If the
-master fails and stops sending keepalive packets, the router with the next
-highest priority becomes the new master and takes over the virtual address.
-
-VRRP keepalive packets use multicast, and VRRP setups are limited to a single
-datalink layer segment. You can setup multiple VRRP groups
-(also called virtual routers). Virtual routers are identified by a
-VRID (Virtual Router IDentifier). If you setup multiple groups on the same
-interface, their VRIDs must be unique if they use the same address family,
-but it's possible (even if not recommended for readability reasons) to use
-duplicate VRIDs on different interfaces.
-
-## Basic setup
-
-VRRP groups are created with the
-`set high-availability vrrp group $GROUP_NAME` commands. The required
-parameters are interface, vrid, and address.
-
-minimal config
-
-``` none
-set high-availability vrrp group Foo vrid 10
-set high-availability vrrp group Foo interface eth0
-set high-availability vrrp group Foo address 192.0.2.1/24
-```
-
-You can verify your VRRP group status with the operational mode
-`run show vrrp` command:
-
-``` none
-vyos@vyos# run show vrrp
-Name        Interface      VRID  State    Last Transition
-----------  -----------  ------  -------  -----------------
-Foo         eth1             10  MASTER   2s
-```
-
-## IPv6 support
-
-The `address` parameter can be either an IPv4 or IPv6 address, but you can
-not mix IPv4 and IPv6 in the same group, and will need to create groups with
-different VRIDs specially for IPv4 and IPv6.
-If you want to use IPv4 + IPv6 address you can use option `excluded-address`
-
-## Address
-
-The `address` can be configured either on the VRRP interface or on not VRRP
-interface.
-
-``` none
-set high-availability vrrp group Foo address 192.0.2.1/24
-set high-availability vrrp group Foo address 203.0.113.22/24 interface eth2
-set high-availability vrrp group Foo address 198.51.100.33/24 interface eth3
-```
-
-## Disabling a VRRP group
-
-You can disable a VRRP group with `disable` option:
-
-``` none
-set high-availability vrrp group Foo disable
-```
-
-A disabled group will be removed from the VRRP process and your router will not
-participate in VRRP for that VRID. It will disappear from operational mode
-commands output, rather than enter the backup state.
-
-## Exclude address
-
-Exclude IP addresses from `VRRP packets`. This option `excluded-address` is
-used when you want to set IPv4 + IPv6 addresses on the same virtual interface
-or when used more than 20 IP addresses.
-
-``` none
-set high-availability vrrp group Foo excluded-address '203.0.113.254/24'
-set high-availability vrrp group Foo excluded-address '2001:db8:aa::1/64'
-set high-availability vrrp group Foo excluded-address '2001:db8:22::1/64'
-```
-
-## Setting VRRP group priority
-
-VRRP priority can be set with `priority` option:
-
-``` none
-set high-availability vrrp group Foo priority 200
-```
-
-The priority must be an integer number from 1 to 255. Higher priority value
-increases router's precedence in the master elections.
-
-## Sync groups
-
-A sync group allows VRRP groups to transition together.
-
-``` none
-edit high-availability vrrp
-set sync-group MAIN member VLAN9
-set sync-group MAIN member VLAN20
-```
-
-In the following example, when VLAN9 transitions, VLAN20 will also transition:
-
-``` none
-vrrp {
-    group VLAN9 {
-        interface eth0.9
-        address 10.9.1.1/24
-        priority 200
-        vrid 9
-    }
-    group VLAN20 {
-        interface eth0.20
-        priority 200
-        address 10.20.20.1/24
-        vrid 20
-    }
-    sync-group MAIN {
-        member VLAN20
-        member VLAN9
-    }
-}
-```
-
-<div class="warning">
-
-<div class="title">
-
-Warning
-
-</div>
-
-All items in a sync group should be similarly configured.
-If one VRRP group is set to a different preemption delay or priority,
-it would result in an endless transition loop.
-
-</div>
-
-## Preemption
-
-VRRP can use two modes: preemptive and non-preemptive. In the preemptive mode,
-if a router with a higher priority fails and then comes back, routers with lower
-priority will give up their master status. In non-preemptive mode, the newly
-elected master will keep the master status and the virtual address indefinitely.
-
-By default VRRP uses preemption. You can disable it with the "no-preempt"
-option:
-
-``` none
-set high-availability vrrp group Foo no-preempt
-```
-
-You can also configure the time interval for preemption with the "preempt-delay"
-option. For example, to set the higher priority router to take over in 180
-seconds, use:
-
-``` none
-set high-availability vrrp group Foo preempt-delay 180
-```
-
-## Track
-
-Track option to track non VRRP interface states. VRRP changes status to
-`FAULT` if one of the track interfaces in state `down`.
-
-``` none
-set high-availability vrrp group Foo track interface eth0
-set high-availability vrrp group Foo track interface eth1
-```
-
-Ignore VRRP main interface faults
-
-``` none
-set high-availability vrrp group Foo track exclude-vrrp-interface
-```
-
-## Unicast VRRP
-
-By default VRRP uses multicast packets. If your network does not support
-multicast for whatever reason, you can make VRRP use unicast communication
-instead.
-
-``` none
-set high-availability vrrp group Foo peer-address 192.0.2.10
-set high-availability vrrp group Foo hello-source-address 192.0.2.15
-```
-
-## rfc3768-compatibility
-
-RFC 3768 defines a virtual MAC address to each VRRP virtual router.
-This virtual router MAC address will be used as the source in all periodic VRRP
-messages sent by the active node. When the rfc3768-compatibility option is set,
-a new VRRP interface is created, to which the MAC address and the virtual IP
-address is automatically assigned.
-
-``` none
-set high-availability vrrp group Foo rfc3768-compatibility
-```
-
-Verification
-
-``` none
-$show interfaces ethernet eth0v10
-eth0v10@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
-state UP group default qlen 1000
-link/ether 00:00:5e:00:01:0a brd ff:ff:ff:ff:ff:ff
-inet 172.25.0.247/16 scope global eth0v10
-valid_lft forever preferred_lft forever
-```
-
-<div class="warning">
-
-<div class="title">
-
-Warning
-
-</div>
-
-RFC 3768 creates a virtual interface. If you want to apply
-the destination NAT rule to the traffic sent to the virtual MAC, set
-the created virtual interface as <span class="title-ref">inbound-interface</span>.
-
-</div>
-
-## Global options
-
-On most scenarios, there's no need to change specific parameters, and using
-default configuration is enough. But there are cases were extra configuration
-is needed.
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters startup_delay \<1-600\>
-
-This option specifies a delay in seconds before vrrp instances start up
-after keepalived starts.
-
-</div>
-
-## Gratuitous ARP
-
-These configuration is not mandatory and in most cases there's no
-need to configure it. But if necessary, Gratuitous ARP can be configured in
-`global-parameters` and/or in `group` section.
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters garp interval
-\<0.000-1000\>
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp group \<name\> garp interval \<0.000-1000\>
-
-Set delay between gratuitous ARP messages sent on an interface.
-
-0 if not defined.
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters garp master-delay \<1-255\>
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp group \<name\> garp master-delay \<1-255\>
-
-Set delay for second set of gratuitous ARPs after transition to MASTER.
-
-5 if not defined.
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters garp master-refresh
-\<1-600\>
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp group \<name\> garp master-refresh
-\<1-600\>
-
-Set minimum time interval for refreshing gratuitous ARPs while MASTER.
-
-0 if not defined, which means no refreshing.
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters garp
-master-refresh-repeat \<1-600\>
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp group \<name\> garp
-master-refresh-repeat \<1-600\>
-
-Set number of gratuitous ARP messages to send at a time while MASTER.
-
-1 if not defined.
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters garp master-repeat
-\<1-600\>
-
-</div>
-
-<div class="cfgcmd">
-
-set high-availability vrrp group \<name\> garp master-repeat
-\<1-600\>
-
-Set number of gratuitous ARP messages to send at a time after transition to
-MASTER.
-
-5 if not defined.
-
-</div>
-
-## Version
-
-<div class="cfgcmd">
-
-set high-availability vrrp global-parameters version 2|3
-
-Set the default VRRP version to use. This defaults to 2, but IPv6 instances
-will always use version 3.
-
-</div>
-
-## Scripting
-
-VRRP functionality can be extended with scripts. VyOS supports two kinds of
-scripts: health check scripts and transition scripts. Health check scripts
-execute custom checks in addition to the master router reachability. Transition
-scripts are executed when VRRP state changes from master to backup or fault and
-vice versa and can be used to enable or disable certain services, for example.
-
-### Health check scripts
-
-This setup will make the VRRP process execute the
-`/config/scripts/vrrp-check.sh script` every 60 seconds, and transition the
-group to the fault state if it fails (i.e. exits with non-zero status) three
-times:
-
-``` none
-set high-availability vrrp group Foo health-check script /config/scripts/vrrp-check.sh
-set high-availability vrrp group Foo health-check interval 60
-set high-availability vrrp group Foo health-check failure-count 3
-```
-
-When the vrrp group is a member of the sync group will use only
-the sync group health check script.
-This example shows how to configure it for the sync group:
-
-``` none
-set high-availability vrrp sync-group Bar health-check script /config/scripts/vrrp-check.sh
-set high-availability vrrp sync-group Bar health-check interval 60
-set high-availability vrrp sync-group Bar health-check failure-count 3
-```
-
-### Transition scripts
-
-Transition scripts can help you implement various fixups, such as starting and
-stopping services, or even modifying the VyOS config on VRRP transition.
-This setup will make the VRRP process execute the
-`/config/scripts/vrrp-fail.sh` with argument `Foo` when VRRP fails,
-and the `/config/scripts/vrrp-master.sh` when the router becomes the master:
-
-``` none
-set high-availability vrrp group Foo transition-script backup "/config/scripts/vrrp-fail.sh Foo"
-set high-availability vrrp group Foo transition-script fault "/config/scripts/vrrp-fail.sh Foo"
-set high-availability vrrp group Foo transition-script master "/config/scripts/vrrp-master.sh Foo"
-```
-
-To know more about scripting, check the `command-scripting` section.
-
-## Virtual-server
-
-Virtual Server allows to Load-balance traffic destination virtual-address:port
-between several real servers.
-
-### Algorithm
-
-Load-balancing schedule algorithm:
-
-- round-robin
-- weighted-round-robin
-- least-connection
-- weighted-least-connection
-- source-hashing
-- destination-hashing
-- locality-based-least-connection
-
-``` none
-set high-availability virtual-server 203.0.113.1 algorithm 'least-connection'
-```
-
-### Forward method
-
-- NAT
-- direct
-- tunnel
-
-``` none
-set high-availability virtual-server 203.0.113.1 forward-method 'nat'
-```
-
-### Health-check
-
-Custom health-check script allows checking real-server availability
-
-``` none
-set high-availability virtual-server 203.0.113.1 real-server 192.0.2.11 health-check script <path-to-script>
-```
-
-### Fwmark
-
-Firewall mark. It possible to loadbalancing traffic based on `fwmark` value
-
-``` none
-set high-availability virtual-server 203.0.113.1 fwmark '111'
-```
-
-### Real server
-
-Real server IP address and port
-
-``` none
-set high-availability virtual-server 203.0.113.1 real-server 192.0.2.11 port '80'
-```
-
-### Example
-
-Virtual-server can be configured with VRRP virtual address or without VRRP.
-
-In the next example all traffic destined to `203.0.113.1` and port `8280`
-protocol TCP is balanced between 2 real servers `192.0.2.11` and
-`192.0.2.12` to port `80`
-
-Real server is auto-excluded if port check with this server fail.
-
-``` none
-set interfaces ethernet eth0 address '203.0.113.11/24'
-set interfaces ethernet eth1 address '192.0.2.1/24'
-set high-availability vrrp group FOO interface 'eth0'
-set high-availability vrrp group FOO no-preempt
-set high-availability vrrp group FOO priority '150'
-set high-availability vrrp group FOO address '203.0.113.1/24'
-set high-availability vrrp group FOO vrid '10'
-
-set high-availability virtual-server 203.0.113.1 algorithm 'source-hashing'
-set high-availability virtual-server 203.0.113.1 delay-loop '10'
-set high-availability virtual-server 203.0.113.1 forward-method 'nat'
-set high-availability virtual-server 203.0.113.1 persistence-timeout '180'
-set high-availability virtual-server 203.0.113.1 port '8280'
-set high-availability virtual-server 203.0.113.1 protocol 'tcp'
-set high-availability virtual-server 203.0.113.1 real-server 192.0.2.11 port '80'
-set high-availability virtual-server 203.0.113.1 real-server 192.0.2.12 port '80'
-```
-
-A firewall mark `fwmark` allows using multiple ports for high-availability
-virtual-server.
-It uses fwmark value.
-
-In this example all traffic destined to ports "80, 2222, 8888" protocol TCP
-marks to fwmark "111" and balanced between 2 real servers.
-Port "0" is required if multiple ports are used.
-
-``` none
-set interfaces ethernet eth0 address 'dhcp'
-set interfaces ethernet eth0 description 'WAN'
-set interfaces ethernet eth1 address '192.0.2.1/24'
-set interfaces ethernet eth1 description 'LAN'
-
-set policy route PR interface 'eth0'
-set policy route PR rule 10 destination port '80,2222,8888'
-set policy route PR rule 10 protocol 'tcp'
-set policy route PR rule 10 set mark '111'
-
-set high-availability virtual-server vyos fwmark '111'
-set high-availability virtual-server vyos protocol 'tcp'
-set high-availability virtual-server vyos real-server 192.0.2.11 health-check script '/config/scripts/check-real-server-first.sh'
-set high-availability virtual-server vyos real-server 192.0.2.11 port '0'
-set high-availability virtual-server vyos real-server 192.0.2.12 health-check script '/config/scripts/check-real-server-second.sh'
-set high-availability virtual-server vyos real-server 192.0.2.12 port '0'
-
-set nat source rule 100 outbound-interface 'eth0'
-set nat source rule 100 source address '192.0.2.0/24'
-set nat source rule 100 translation address 'masquerade'
-```
-
-Op-mode check virtual-server status
-
-``` none
-vyos@r14:~$ run show virtual-server
-IP Virtual Server version 1.2.1 (size=4096)
-Prot LocalAddress:Port Scheduler Flags
-  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
-FWM  111 lc persistent 300
-  -> 192.0.2.11:0                 Masq    1      0          0
-  -> 192.0.2.12:0                 Masq    1      1          0
-```