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-# SRv6 endpoint to SR-unaware appliance via static proxy (End.AS) {#srv6_as_plugin_doc}
-
-## Overview
-
-The static proxy is an SR endpoint behavior for processing SR-MPLS or SRv6
-encapsulated traffic on behalf of an SR-unaware SF. This proxy thus receives SR
-traffic that is formed of an MPLS label stack or an IPv6 header on top of an
-inner packet, which can be Ethernet, IPv4 or IPv6.
-
-A static SR proxy segment is associated with the following mandatory parameters:
-
-- INNER-TYPE: Inner packet type
-- S-ADDR: Ethernet or IP address of the SF (only for inner type IPv4 and IPv6)
-- IFACE-OUT: Local interface for sending traffic towards the SF
-- IFACE-IN: Local interface receiving the traffic coming back from the SF
-- CACHE: SR information to be attached on the traffic coming back from the SF,
-including at least
-	* CACHE.SA: IPv6 source address (SRv6 only)
-	* CACHE.LIST: Segment list expressed as MPLS labels or IPv6 address
-
-A static SR proxy segment is thus defined for a specific SF, inner packet type
-and cached SR information. It is also bound to a pair of directed interfaces on
-the proxy. These may be both directions of a single interface, or opposite
-directions of two different interfaces. The latter is recommended in case the SF
-is to be used as part of a bi-directional SR SC policy. If the proxy and the SF
-both support 802.1Q, IFACE-OUT and IFACE-IN can also represent sub-interfaces.
-
-The first part of this behavior is triggered when the proxy node receives a
-packet whose active segment matches a segment associated with the static proxy
-behavior. It removes the SR information from the packet then sends it on a
-specific interface towards the associated SF. This SR information corresponds to
-the full label stack for SR-MPLS or to the encapsulation IPv6 header with any
-attached extension header in the case of SRv6.
-
-The second part is an inbound policy attached to the proxy interface receiving
-the traffic returning from the SF, IFACE-IN. This policy attaches to the
-incoming traffic the cached SR information associated with the SR proxy segment.
-If the proxy segment uses the SR-MPLS data plane, CACHE contains a stack of
-labels to be pushed on top the packets. With the SRv6 data plane, CACHE is
-defined as a source address, an active segment and an optional SRH (tag,
-segments left, segment list and metadata). The proxy encapsulates the packets
-with an IPv6 header that has the source address, the active segment as
-destination address and the SRH as a routing extension header. After the SR
-information has been attached, the packets are forwarded according to the active
-segment, which is represented by the top MPLS label or the IPv6 Destination
-Address.
-
-In this scenario, there are no restrictions on the operations that can be
-performed by the SF on the stream of packets. It may operate at all protocol
-layers, terminate transport layer connections, generate new packets and initiate
-transport layer connections. This behavior may also be used to integrate an
-IPv4-only SF into an SRv6 policy. However, a static SR proxy segment can be used
-in only one service chain at a time. As opposed to most other segment types, a
-static SR proxy segment is bound to a unique list of segments, which represents
-a directed SR SC policy. This is due to the cached SR information being defined
-in the segment configuration. This limitation only prevents multiple segment
-lists from using the same static SR proxy segment at the same time, but a single
-segment list can be shared by any number of traffic flows. Besides, since the
-returning traffic from the SF is re-classified based on the incoming interface,
-an interface can be used as receiving interface (IFACE-IN) only for a single SR
-proxy segment at a time. In the case of a bi-directional SR SC policy, a
-different SR proxy segment and receiving interface are required for the return
-direction.
-
-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.AS segment that sends the inner
-packets on interface `IFACE-OUT` towards an appliance at address `S-ADDR` and
-restores the segment list ``<S1, S2, S3>`` with a source address `SRC-ADDR` on
-the packets coming back on interface `IFACE-IN`.
-
-```
-sr localsid address SID behavior end.as nh S-ADDR oif IFACE-OUT iif IFACE-IN src SRC-ADDR next S1 next S2 next S3
-```
-
-For example, the below command configures the SID `1::A1` with an End.AS
-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.as nh A1:: oif GigabitEthernet0/8/0 iif GigabitEthernet0/9/0 src 1:: next 2::20 next 3::30 next 4::40
-```
-
-## Pseudocode
-
-### Static proxy for inner type IPv4
-
-Upon receiving an IPv6 packet destined for S, where S is an IPv6 static proxy
-segment for IPv4 traffic, a node N does:
-
-```
-IF ENH == 4 THEN                                                ;; Ref1
-    Remove the (outer) IPv6 header and its extension headers
-    Forward the exposed packet on IFACE-OUT towards S-ADDR
-ELSE
-    Drop the packet
-```
-
-**Ref1:** 4 refers to IPv4 encapsulation as defined by IANA allocation for Internet
-Protocol Numbers.
-
-Upon receiving a non link-local IPv4 packet on IFACE-IN, a node N does:
-
-```
-Decrement TTL and update checksum
-IF CACHE.SRH THEN                                               ;; Ref2
-    Push CACHE.SRH on top of the existing IPv4 header
-    Set NH value of the pushed SRH to 4
-Push outer IPv6 header with SA, DA and traffic class from CACHE
-Set outer payload length and flow label
-Set NH value to 43 if an SRH was added, or 4 otherwise
-Lookup outer DA in appropriate table and proceed accordingly
-```
-
-**Ref2:** CACHE.SRH represents the SRH defined in CACHE, if any, for the static SR
-proxy segment associated with IFACE-IN.
-
-### Static proxy for inner type IPv6
-
-Upon receiving an IPv6 packet destined for S, where S is an IPv6 static proxy
-segment for IPv6 traffic, a node N does:
-
-```
-IF ENH == 41 THEN                                               ;; Ref1
-    Remove the (outer) IPv6 header and its extension headers
-    Forward the exposed packet on IFACE-OUT towards S-ADDR
-ELSE
-    Drop the packet
-```
-
-**Ref1:** 41 refers to IPv6 encapsulation as defined by IANA allocation for Internet
-Protocol Numbers.
-
-Upon receiving a non-link-local IPv6 packet on IFACE-IN, a node N does:
-
-```
-Decrement Hop Limit
-IF CACHE.SRH THEN                                               ;; Ref2
-    Push CACHE.SRH on top of the existing IPv6 header
-    Set NH value of the pushed SRH to 41
-Push outer IPv6 header with SA, DA and traffic class from CACHE
-Set outer payload length and flow label
-Set NH value to 43 if an SRH was added, or 41 otherwise
-Lookup outer DA in appropriate table and proceed accordingly
-```
-
-**Ref2:** CACHE.SRH represents the SRH defined in CACHE, if any, for the static SR
-proxy segment associated with IFACE-IN.