docs: convert plugins doc md->rst

Type: improvement

Change-Id: I7e821cce1feae229e1be4baeed249b9cca658135
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

1 files changed, 0 insertions, 100 deletions

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-# SRv6 endpoint to SR-unaware appliance via masquerading (End.AM) {#srv6_am_plugin_doc}
-
-The masquerading proxy is an SR endpoint behavior for processing SRv6 traffic on
-behalf of an SR-unaware SF. This proxy thus receives SR traffic that is formed
-of an IPv6 header and an SRH on top of an inner payload. The masquerading
-behavior is independent from the inner payload type. Hence, the inner payload
-can be of any type but it is usually expected to be a transport layer packet,
-such as TCP or UDP.
-
-A masquerading SR proxy segment is associated with the following mandatory
-parameters:
-
-- S-ADDR: Ethernet or IPv6 address of the SF
-- IFACE-OUT: Local interface for sending traffic towards the SF
-- IFACE-IN: Local interface receiving the traffic coming back from the SF
-
-A masquerading SR proxy segment is thus defined for a specific SF and bound to a
-pair of directed interfaces or sub-interfaces on the proxy. As opposed to the
-static and dynamic SR proxies, a masquerading segment can be present at the same
-time in any number of SR SC policies and the same interfaces can be bound to
-multiple masquerading proxy segments. The only restriction is that a
-masquerading proxy segment cannot be the last segment in an SR SC policy.
-
-The first part of the masquerading behavior is triggered when the proxy node
-receives an IPv6 packet whose Destination Address matches a masquerading proxy
-segment. The proxy inspects the IPv6 extension headers and substitutes the
-Destination Address with the last segment in the SRH attached to the IPv6
-header, which represents the final destination of the IPv6 packet. The packet is
-then sent out towards the SF.
-
-The SF receives an IPv6 packet whose source and destination addresses are
-respectively the original source and final destination. It does not attempt to
-inspect the SRH, as RFC8200 specifies that routing extension headers are not
-examined or processed by transit nodes. Instead, the SF simply forwards the
-packet based on its current Destination Address. In this scenario, we assume
-that the SF can only inspect, drop or perform limited changes to the packets.
-For example, Intrusion Detection Systems, Deep Packet Inspectors and non-NAT
-Firewalls are among the SFs that can be supported by a masquerading SR proxy.
-
-The second part of the masquerading behavior, also called de- masquerading, is
-an inbound policy attached to the proxy interface receiving the traffic
-returning from the SF, IFACE-IN. This policy inspects the incoming traffic and
-triggers a regular SRv6 endpoint processing (End) on any IPv6 packet that
-contains an SRH. This processing occurs before any lookup on the packet
-Destination Address is performed and it is sufficient to restore the right
-active segment as the Destination Address of the IPv6 packet.
-
-For more information, please see
-[draft-xuclad-spring-sr-service-chaining](https://datatracker.ietf.org/doc/draft-xuclad-spring-sr-service-chaining/).
-
-## CLI configuration
-
-The following command instantiates a new End.AM segment that sends masqueraded
-traffic on interface `IFACE-OUT` towards an appliance at address `S-ADDR` and
-restores the active segment in the IPv6 header of the packets coming back on
-interface `IFACE-IN`.
-
-```
-sr localsid address SID behavior end.am nh S-ADDR oif IFACE-OUT iif IFACE-IN
-```
-
-For example, the below command configures the SID `1::A1` with an End.AM
-function for sending traffic on interface `GigabitEthernet0/8/0` to the
-appliance at address `A1::`, and receiving it back on interface
-`GigabitEthernet0/9/0`.
-
-```
-sr localsid address 1::A1 behavior end.am nh A1:: oif GigabitEthernet0/8/0 iif GigabitEthernet0/9/0
-```
-
-## Pseudocode
-
-### Masquerading
-
-Upon receiving a packet destined for S, where S is an IPv6 masquerading proxy
-segment, a node N processes it as follows.
-
-```
-IF NH=SRH & SL > 0 THEN
-    Update the IPv6 DA with SRH[0]
-    Forward the packet on IFACE-OUT
-ELSE
-    Drop the packet
-```
-
-### De-masquerading
-
-Upon receiving a non-link-local IPv6 packet on IFACE-IN, a node N processes it
-as follows.
-
-```
-IF NH=SRH & SL > 0 THEN
-    Decrement SL
-    Update the IPv6 DA with SRH[SL]                             ;; Ref1
-    Lookup DA in appropriate table and proceed accordingly
-```
-
-**Ref1:** This pseudocode can be augmented to support the Penultimate Segment
-Popping (PSP) endpoint flavor. The exact pseudocode modification are provided in
-[draft-filsfils-spring-srv6-network-programming](https://datatracker.ietf.org/doc/draft-filsfils-spring-srv6-network-programming/).