Add multicast-focused AFTs by bewing · Pull Request #1468 · openconfig/public

bewing · 2026-04-02T21:24:08Z

As an operator, I need a standard way to monitor the current forwarding behavior of multicast on my network, across multiple vendor types.

Most(?) platforms forward multicast under a input interface / OIL model, keyed by various FECs. This change attempts to provide an initial implementation for IPv4, IPv6, and MPLS forwarding of multicast traffic.

Change Scope

Add multicast-focused AFTs
This change only adds new AFTs, and should be backwards compatible with existing implementations of AFT

Platform Implementations

Implementation A: Arista
Implementation B: Cisco
Implementation C: Linux

Tree View

--- /home/bewing/old-tree.txt   2026-05-20 11:44:22.678265610 -0500
+++ /home/bewing/new-tree.txt   2026-05-20 12:50:19.973577532 -0500
@@ -3853,390 +3853,475 @@
         |  |        +--rw next-hop* [index]
         |  |           +--rw index     -> ../config/index
         |  |           +--rw config
         |  |           |  +--rw index?   -> ../../../../../../next-hops/next-hop/index
         |  |           +--ro state
         |  |              +--ro index?   -> ../../../../../../next-hops/next-hop/index
         |  +--rw next-hops
         |     +--rw next-hop* [index]
         |        +--rw index            -> ../config/index
         |        +--rw config
         |        |  +--rw index?                                     string
         |        |  +--rw next-hop?                                  union
         |        |  +--rw recurse?                                   boolean
         |        |  +--rw metric?                                    uint32
         |        |  +--rw preference?                                uint32
         |        |  +--rw wecmp-weight?                              union
         |        |  +--rw oc-loc-rt-netinst:next-network-instance?   -> /oc-ni:network-instances/network-instance/config/name
         |        |  +--rw oc-loc-rt-netinst:nh-network-instance?     -> /oc-ni:network-instances/network-instance/config/name
         |        +--ro state
         |        |  +--ro index?                                     string
         |        |  +--ro next-hop?                                  union
         |        |  +--ro recurse?                                   boolean
         |        |  +--ro metric?                                    uint32
         |        |  +--ro preference?                                uint32
         |        |  +--ro wecmp-weight?                              union
         |        |  +--ro oc-loc-rt-netinst:next-network-instance?   -> /oc-ni:network-instances/network-instance/config/name
         |        |  +--ro oc-loc-rt-netinst:nh-network-instance?     -> /oc-ni:network-instances/network-instance/config/name
         |        +--rw encap-headers
         |           +--rw encap-header* [index]
         |              +--rw index     -> ../config/index
         |              +--rw config
         |              |  +--rw index?   uint8
         |              |  +--rw type?    oc-aftt:encapsulation-header-type
         |              +--ro state
         |              |  +--ro index?   uint8
         |              |  +--ro type?    oc-aftt:encapsulation-header-type
         |              +--rw udp-v4
         |              |  +--rw config
         |              |  |  +--rw src-ip?         oc-inet:ipv4-address
         |              |  |  +--rw dst-ip?         oc-inet:ipv4-address
         |              |  |  +--rw dscp?           oc-inet:dscp
         |              |  |  +--rw src-udp-port?   oc-inet:port-number
         |              |  |  +--rw dst-udp-port?   oc-inet:port-number
         |              |  |  +--rw ip-ttl?         uint8
         |              |  +--ro state
         |              |     +--ro src-ip?         oc-inet:ipv4-address
         |              |     +--ro dst-ip?         oc-inet:ipv4-address
         |              |     +--ro dscp?           oc-inet:dscp
         |              |     +--ro src-udp-port?   oc-inet:port-number
         |              |     +--ro dst-udp-port?   oc-inet:port-number
         |              |     +--ro ip-ttl?         uint8
         |              +--rw gre
         |              |  +--rw config
         |              |  |  +--rw src-ip?   oc-inet:ip-address
         |              |  |  +--rw dst-ip?   oc-inet:ip-address
         |              |  |  +--rw ttl?      uint8
         |              |  +--ro state
         |              |     +--ro src-ip?   oc-inet:ip-address
         |              |     +--ro dst-ip?   oc-inet:ip-address
         |              |     +--ro ttl?      uint8
         |              +--rw mpls
         |                 +--rw config
         |                 |  +--rw traffic-class?   oc-mplst:mpls-tc
         |                 |  +--rw label?           oc-mplst:mpls-label
         |                 +--ro state
         |                    +--ro traffic-class?   oc-mplst:mpls-tc
         |                    +--ro label?           oc-mplst:mpls-label
         +--rw afts
         |  +--ro ipv4-unicast
         |  |  +--ro ipv4-entry* [prefix]
         |  |     +--ro prefix    -> ../state/prefix
         |  |     +--ro state
         |  |        +--ro prefix?                                     oc-inet:ipv4-prefix
         |  |        +--ro counters
         |  |        |  x--ro packets-forwarded?          oc-yang:counter64
         |  |        |  x--ro octets-forwarded?           oc-yang:counter64
         |  |        |  x--ro packets-forwarded-backup?   oc-yang:counter64
         |  |        |  x--ro octets-forwarded-backup?    oc-yang:counter64
         |  |        +--ro entry-metadata?                             binary
         |  |        +--ro origin-protocol?                            identityref
         |  |        +--ro decapsulate-header?                         oc-aftt:encapsulation-header-type
         |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
         |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
         |  |        +--ro oc-aftni:origin-network-instance?           oc-ni:network-instance-ref
         |  +--ro ipv6-unicast
         |  |  +--ro ipv6-entry* [prefix]
         |  |     +--ro prefix    -> ../state/prefix
         |  |     +--ro state
         |  |        +--ro prefix?                                     oc-inet:ipv6-prefix
         |  |        +--ro counters
         |  |        |  x--ro packets-forwarded?          oc-yang:counter64
         |  |        |  x--ro octets-forwarded?           oc-yang:counter64
         |  |        |  x--ro packets-forwarded-backup?   oc-yang:counter64
         |  |        |  x--ro octets-forwarded-backup?    oc-yang:counter64
         |  |        +--ro entry-metadata?                             binary
         |  |        +--ro origin-protocol?                            identityref
         |  |        +--ro decapsulate-header?                         oc-aftt:encapsulation-header-type
         |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
         |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
         |  |        +--ro oc-aftni:origin-network-instance?           oc-ni:network-instance-ref
+        |  +--ro ipv4-multicast
+        |  |  +--ro ipv4-multicast-entry* [source-address group-address]
+        |  |     +--ro source-address    -> ../state/source-address
+        |  |     +--ro group-address     -> ../state/group-address
+        |  |     +--ro state
+        |  |        +--ro source-address?                             oc-inet:ipv4-address
+        |  |        +--ro group-address?                              oc-inet:ipv4-address
+        |  |        +--ro counters
+        |  |        |  x--ro packets-forwarded?   oc-yang:counter64
+        |  |        |  x--ro octets-forwarded?    oc-yang:counter64
+        |  |        +--ro entry-metadata?                             binary
+        |  |        +--ro origin-protocol?                            identityref
+        |  |        +--ro decapsulate-header?                         oc-aftt:encapsulation-header-type
+        |  |        +--ro reverse-path-interface
+        |  |        |  +--ro interface-ref
+        |  |        |     +--ro state
+        |  |        |        +--ro interface?      -> /oc-if:interfaces/interface/name
+        |  |        |        +--ro subinterface?   -> /oc-if:interfaces/interface[oc-if:name=current()/../interface]/subinterfaces/subinterface/index
+        |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
+        |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
+        |  +--ro ipv6-multicast
+        |  |  +--ro ipv6-multicast-entry* [source-address group-address]
+        |  |     +--ro source-address    -> ../state/source-address
+        |  |     +--ro group-address     -> ../state/group-address
+        |  |     +--ro state
+        |  |        +--ro source-address?                             oc-inet:ipv6-address
+        |  |        +--ro group-address?                              oc-inet:ipv6-address
+        |  |        +--ro counters
+        |  |        |  x--ro packets-forwarded?   oc-yang:counter64
+        |  |        |  x--ro octets-forwarded?    oc-yang:counter64
+        |  |        +--ro entry-metadata?                             binary
+        |  |        +--ro origin-protocol?                            identityref
+        |  |        +--ro decapsulate-header?                         oc-aftt:encapsulation-header-type
+        |  |        +--ro reverse-path-interface
+        |  |        |  +--ro interface-ref
+        |  |        |     +--ro state
+        |  |        |        +--ro interface?      -> /oc-if:interfaces/interface/name
+        |  |        |        +--ro subinterface?   -> /oc-if:interfaces/interface[oc-if:name=current()/../interface]/subinterfaces/subinterface/index
+        |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
+        |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
+        |  +--ro mpls-multicast
+        |  |  +--ro multicast-label-entry* [label]
+        |  |     +--ro label                      -> ../state/label
+        |  |     +--ro state
+        |  |     |  +--ro label?                                      oc-mplst:mpls-label
+        |  |     |  +--ro counters
+        |  |     |  |  x--ro packets-forwarded?   oc-yang:counter64
+        |  |     |  |  x--ro octets-forwarded?    oc-yang:counter64
+        |  |     |  +--ro entry-metadata?                             binary
+        |  |     |  +--ro origin-protocol?                            identityref
+        |  |     |  +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
+        |  |     |  +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
+        |  |     +--ro decap-mpls-label-stacks
+        |  |        +--ro decap-mpls-label-stack* [id]
+        |  |           +--ro id       -> ../state/id
+        |  |           +--ro state
+        |  |              +--ro id?      uint8
+        |  |              +--ro label?   oc-mplst:mpls-label
         |  +--ro policy-forwarding
         |  |  +--ro policy-forwarding-entry* [index]
         |  |     +--ro index    -> ../state/index
         |  |     +--ro state
         |  |        +--ro index?                                      uint64
         |  |        +--ro ip-prefix?                                  oc-inet:ip-prefix
         |  |        +--ro mac-address?                                oc-yang:mac-address
         |  |        +--ro mpls-label?                                 oc-mplst:mpls-label
         |  |        +--ro mpls-tc?                                    oc-mplst:mpls-tc
         |  |        +--ro ip-dscp?                                    oc-inet:dscp
         |  |        +--ro ip-protocol?                                oc-pkt-match-types:ip-protocol-type
         |  |        +--ro l4-src-port?                                oc-inet:port-number
         |  |        +--ro l4-dst-port?                                oc-inet:port-number
         |  |        +--ro counters
         |  |        |  x--ro packets-forwarded?   oc-yang:counter64
         |  |        |  x--ro octets-forwarded?    oc-yang:counter64
         |  |        +--ro entry-metadata?                             binary
         |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
         |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
         |  +--ro mpls
         |  |  +--ro label-entry* [label]
         |  |     +--ro label                      -> ../state/label
         |  |     +--ro state
         |  |     |  +--ro label?                                      oc-mplst:mpls-label
         |  |     |  +--ro counters
         |  |     |  |  x--ro packets-forwarded?   oc-yang:counter64
         |  |     |  |  x--ro octets-forwarded?    oc-yang:counter64
         |  |     |  +--ro entry-metadata?                             binary
         |  |     |  x--ro popped-mpls-label-stack*                    oc-mplst:mpls-label
         |  |     |  +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
         |  |     |  +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
         |  |     +--ro decap-mpls-label-stacks
         |  |        +--ro decap-mpls-label-stack* [id]
         |  |           +--ro id       -> ../state/id
         |  |           +--ro state
         |  |              +--ro id?      uint8
         |  |              +--ro label?   oc-mplst:mpls-label
         |  +--ro ethernet
         |  |  +--ro mac-entry* [mac-address]
         |  |     +--ro mac-address    -> ../state/mac-address
         |  |     +--ro state
         |  |        +--ro mac-address?                                oc-yang:mac-address
         |  |        +--ro counters
         |  |        |  x--ro packets-forwarded?   oc-yang:counter64
         |  |        |  x--ro octets-forwarded?    oc-yang:counter64
         |  |        +--ro entry-metadata?                             binary
         |  |        +--ro oc-aftni:next-hop-group?                    -> /oc-ni:network-instances/network-instance/afts/next-hop-groups/next-hop-group/state/id
         |  |        +--ro oc-aftni:next-hop-group-network-instance?   oc-ni:network-instance-ref
         |  +--ro state-synced
         |  |  +--ro state
         |  |     +--ro ipv4-unicast?   boolean
         |  |     +--ro ipv6-unicast?   boolean
         |  +--ro next-hop-groups
         |  |  +--ro next-hop-group* [id]
         |  |     +--ro id             -> ../state/id
         |  |     +--ro state
         |  |     |  +--ro id?                      uint64
         |  |     |  +--ro next-hop-group-name?     string
         |  |     |  +--ro programmed-id?           uint64
         |  |     |  +--ro color?                   uint64
         |  |     |  +--ro backup-next-hop-group?   -> ../../../next-hop-group/state/id
         |  |     |  +--ro backup-active?           boolean
         |  |     +--ro next-hops
         |  |     |  +--ro next-hop* [index]
         |  |     |     +--ro index    -> ../state/index
         |  |     |     +--ro state
         |  |     |        +--ro index?    -> ../../../../../../next-hops/next-hop/state/index
         |  |     |        +--ro weight?   uint64
         |  |     +--ro conditional
         |  |        +--ro condition* [id]
         |  |           +--ro id                  -> ../state/id
         |  |           +--ro state
         |  |           |  +--ro id?               uint64
         |  |           |  +--ro dscp*             oc-inet:dscp
         |  |           |  +--ro next-hop-group?   -> ../../../../../next-hop-group/state/id
         |  |           +--ro input-interfaces
         |  |              +--ro input-interface* [id]
         |  |                 +--ro id       -> ../state/id
         |  |                 +--ro state
         |  |                    +--ro id?             string
         |  |                    +--ro interface?      -> /oc-if:interfaces/interface/name
         |  |                    +--ro subinterface?   -> /oc-if:interfaces/interface[oc-if:name=current()/../interface]/subinterfaces/subinterface/index
         |  +--ro next-hops
         |  |  +--ro next-hop* [index]
         |  |     +--ro index            -> ../state/index
         |  |     +--ro state
         |  |     |  +--ro index?                       uint64
         |  |     |  +--ro programmed-index?            uint64
         |  |     |  +--ro ip-address?                  oc-inet:ip-address
         |  |     |  +--ro mac-address?                 oc-yang:mac-address
         |  |     |  +--ro pop-top-label?               boolean
         |  |     |  x--ro pushed-mpls-label-stack*     oc-mplst:mpls-label
         |  |     |  +--ro encapsulate-header?          oc-aftt:encapsulation-header-type
         |  |     |  +--ro decapsulate-header?          oc-aftt:encapsulation-header-type
         |  |     |  +--ro origin-protocol?             identityref
         |  |     |  +--ro lsp-name?                    string
         |  |     |  +--ro counters
         |  |     |  |  x--ro packets-forwarded?   oc-yang:counter64
         |  |     |  |  x--ro octets-forwarded?    oc-yang:counter64
         |  |     |  +--ro vni-label?                   oc-evpn-types:evi-id
         |  |     |  +--ro tunnel-src-ip-address?       oc-inet:ip-address
         |  |     |  +--ro oc-aftni:network-instance?   oc-ni:network-instance-ref
         |  |     +--ro ip-in-ip
         |  |     |  +--ro state
         |  |     |     +--ro src-ip?   oc-inet:ip-address
         |  |     |     +--ro dst-ip?   oc-inet:ip-address
         |  |     +--ro gre
         |  |     |  +--ro state
         |  |     |     +--ro src-ip?   oc-inet:ip-address
         |  |     |     +--ro dst-ip?   oc-inet:ip-address
         |  |     |     +--ro ttl?      uint8
         |  |     +--ro encap-headers
         |  |     |  +--ro encap-header* [index]
         |  |     |     +--ro index     -> ../state/index
         |  |     |     +--ro state
         |  |     |     |  +--ro index?   uint8
         |  |     |     |  +--ro type?    oc-aftt:encapsulation-header-type
         |  |     |     +--ro gre
         |  |     |     |  +--ro state
         |  |     |     |     +--ro src-ip?   oc-inet:ip-address
         |  |     |     |     +--ro dst-ip?   oc-inet:ip-address
         |  |     |     |     +--ro ttl?      uint8
         |  |     |     +--ro ipv4
         |  |     |     |  +--ro state
         |  |     |     |     +--ro src-ip?   oc-inet:ip-address
         |  |     |     |     +--ro dst-ip?   oc-inet:ip-address
         |  |     |     +--ro ipv6
         |  |     |     |  +--ro state
         |  |     |     |     +--ro src-ip?   oc-inet:ip-address
         |  |     |     |     +--ro dst-ip?   oc-inet:ip-address
         |  |     |     +--ro mpls
         |  |     |     |  +--ro state
         |  |     |     |  |  +--ro traffic-class?      oc-mplst:mpls-tc
         |  |     |     |  |  x--ro mpls-label-stack*   oc-mplst:mpls-label
         |  |     |     |  +--ro encap-mpls-label-stacks
         |  |     |     |     +--ro encap-mpls-label-stack* [id]
         |  |     |     |        +--ro id       -> ../state/id
         |  |     |     |        +--ro state
         |  |     |     |           +--ro id?      uint8
         |  |     |     |           +--ro label?   oc-mplst:mpls-label
         |  |     |     +--ro udp-v4
         |  |     |     |  +--ro state
         |  |     |     |     +--ro src-ip?         oc-inet:ipv4-address
         |  |     |     |     +--ro dst-ip?         oc-inet:ipv4-address
         |  |     |     |     +--ro dscp?           oc-inet:dscp
         |  |     |     |     +--ro src-udp-port?   oc-inet:port-number
         |  |     |     |     +--ro dst-udp-port?   oc-inet:port-number
         |  |     |     |     +--ro ip-ttl?         uint8
         |  |     |     +--ro udp-v6
         |  |     |     |  +--ro state
         |  |     |     |     +--ro src-ip?         oc-inet:ipv6-address
         |  |     |     |     +--ro dst-ip?         oc-inet:ipv6-address
         |  |     |     |     +--ro dscp?           oc-inet:dscp
         |  |     |     |     +--ro src-udp-port?   oc-inet:port-number
         |  |     |     |     +--ro dst-udp-port?   oc-inet:port-number
         |  |     |     |     +--ro ip-ttl?         uint8
         |  |     |     +--ro vxlan
         |  |     |        +--ro state
         |  |     |           +--ro vni-label?               oc-evpn-types:evi-id
         |  |     |           +--ro tunnel-src-ip-address?   oc-inet:ip-address
         |  |     +--ro interface-ref
         |  |        +--ro state
         |  |           +--ro interface?      -> /oc-if:interfaces/interface/name
         |  |           +--ro subinterface?   -> /oc-if:interfaces/interface[oc-if:name=current()/../interface]/subinterfaces/subinterface/index
         |  +--ro oc-aft-counters:counters
         |  |  +--ro oc-aft-counters:ipv4-unicast
         |  |  |  +--ro oc-aft-counters:ipv4-entry* [prefix]
         |  |  |     +--ro oc-aft-counters:prefix    -> ../state/prefix
         |  |  |     +--ro oc-aft-counters:state
         |  |  |        +--ro oc-aft-counters:prefix?                     oc-inet:ipv4-prefix
         |  |  |        +--ro oc-aft-counters:packets-forwarded?          oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded?           oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:packets-forwarded-backup?   oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded-backup?    oc-yang:counter64
         |  |  +--ro oc-aft-counters:ipv6-unicast
         |  |  |  +--ro oc-aft-counters:ipv6-entry* [prefix]
         |  |  |     +--ro oc-aft-counters:prefix    -> ../state/prefix
         |  |  |     +--ro oc-aft-counters:state
         |  |  |        +--ro oc-aft-counters:prefix?                     oc-inet:ipv6-prefix
         |  |  |        +--ro oc-aft-counters:packets-forwarded?          oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded?           oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:packets-forwarded-backup?   oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded-backup?    oc-yang:counter64
         |  |  +--ro oc-aft-counters:mpls
         |  |  |  +--ro oc-aft-counters:label-entry* [label]
         |  |  |     +--ro oc-aft-counters:label    -> ../state/label
         |  |  |     +--ro oc-aft-counters:state
         |  |  |        +--ro oc-aft-counters:label?               oc-mplst:mpls-label
         |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
+        |  |  +--ro oc-aft-counters:ipv4-multicast
+        |  |  |  +--ro oc-aft-counters:ipv4-multicast-entry* [source-address group-address]
+        |  |  |     +--ro oc-aft-counters:source-address    -> ../state/source-address
+        |  |  |     +--ro oc-aft-counters:group-address     -> ../state/group-address
+        |  |  |     +--ro oc-aft-counters:state
+        |  |  |        +--ro oc-aft-counters:source-address?      oc-inet:ipv4-address
+        |  |  |        +--ro oc-aft-counters:group-address?       oc-inet:ipv4-address
+        |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
+        |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
+        |  |  |        +--ro oc-aft-counters:rpf-discards?        oc-yang:counter64
+        |  |  +--ro oc-aft-counters:ipv6-multicast
+        |  |  |  +--ro oc-aft-counters:ipv6-multicast-entry* [source-address group-address]
+        |  |  |     +--ro oc-aft-counters:source-address    -> ../state/source-address
+        |  |  |     +--ro oc-aft-counters:group-address     -> ../state/group-address
+        |  |  |     +--ro oc-aft-counters:state
+        |  |  |        +--ro oc-aft-counters:source-address?      oc-inet:ipv6-address
+        |  |  |        +--ro oc-aft-counters:group-address?       oc-inet:ipv6-address
+        |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
+        |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
+        |  |  |        +--ro oc-aft-counters:rpf-discards?        oc-yang:counter64
+        |  |  +--ro oc-aft-counters:mpls-multicast
+        |  |  |  +--ro oc-aft-counters:multicast-label-entry* [label]
+        |  |  |     +--ro oc-aft-counters:label    -> ../state/label
+        |  |  |     +--ro oc-aft-counters:state
+        |  |  |        +--ro oc-aft-counters:label?               oc-mplst:mpls-label
+        |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
+        |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
         |  |  +--ro oc-aft-counters:ethernet
         |  |  |  +--ro oc-aft-counters:mac-entry* [mac-address]
         |  |  |     +--ro oc-aft-counters:mac-address    -> ../state/mac-address
         |  |  |     +--ro oc-aft-counters:state
         |  |  |        +--ro oc-aft-counters:mac-address?         oc-yang:mac-address
         |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
         |  |  +--ro oc-aft-counters:policy-forwarding
         |  |  |  +--ro oc-aft-counters:policy-forwarding-entry* [index]
         |  |  |     +--ro oc-aft-counters:index    -> ../state/index
         |  |  |     +--ro oc-aft-counters:state
         |  |  |        +--ro oc-aft-counters:index?               uint64
         |  |  |        +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
         |  |  |        +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
         |  |  +--ro oc-aft-counters:next-hops
         |  |     +--ro oc-aft-counters:next-hop* [index]
         |  |        +--ro oc-aft-counters:index    -> ../state/index
         |  |        +--ro oc-aft-counters:state
         |  |           +--ro oc-aft-counters:index?               uint64
         |  |           +--ro oc-aft-counters:packets-forwarded?   oc-yang:counter64
         |  |           +--ro oc-aft-counters:octets-forwarded?    oc-yang:counter64
         |  +--rw oc-aft-gf:global-filter
         |  |  +--rw oc-aft-gf:config
         |  |  |  +--rw oc-aft-gf:ipv6-policy?   -> /oc-rpol:routing-policy/policy-definitions/policy-definition/config/name
         |  |  |  +--rw oc-aft-gf:ipv4-policy?   -> /oc-rpol:routing-policy/policy-definitions/policy-definition/config/name
         |  |  +--ro oc-aft-gf:state
         |  |     +--ro oc-aft-gf:ipv6-policy?   -> /oc-rpol:routing-policy/policy-definitions/policy-definition/config/name
         |  |     +--ro oc-aft-gf:ipv4-policy?   -> /oc-rpol:routing-policy/policy-definitions/policy-definition/config/name
         |  +--rw oc-aftsummary:aft-summaries
         |     +--rw oc-aftsummary:ipv4-unicast
         |     |  +--ro oc-aftsummary:protocols
         |     |     +--ro oc-aftsummary:protocol* [origin-protocol]
         |     |        +--ro oc-aftsummary:origin-protocol    -> ../state/origin-protocol
         |     |        +--ro oc-aftsummary:state
         |     |           +--ro oc-aftsummary:origin-protocol?   identityref
         |     |           +--ro oc-aftsummary:counters
         |     |              +--ro oc-aftsummary:aft-entries?   uint64
         |     +--rw oc-aftsummary:ipv6-unicast
         |        +--ro oc-aftsummary:protocols
         |           +--ro oc-aftsummary:protocol* [origin-protocol]
         |              +--ro oc-aftsummary:origin-protocol    -> ../state/origin-protocol
         |              +--ro oc-aftsummary:state
         |                 +--ro oc-aftsummary:origin-protocol?   identityref
         |                 +--ro oc-aftsummary:counters
         |                    +--ro oc-aftsummary:aft-entries?   uint64
         +--rw protocols
         |  +--rw protocol* [identifier name]
         |     +--rw identifier          -> ../config/identifier
         |     +--rw name                -> ../config/name
         |     +--rw config
         |     |  +--rw identifier?       identityref
         |     |  +--rw name?             string
         |     |  +--rw enabled?          boolean
         |     |  +--rw default-metric?   uint32
         |     +--ro state
         |     |  +--ro identifier?       identityref
         |     |  +--ro name?             string
         |     |  +--ro enabled?          boolean
         |     |  +--ro default-metric?   uint32
         |     +--rw static-routes
         |     |  +--rw static* [prefix]
         |     |     +--rw prefix                              -> ../config/prefix
         |     |     +--rw config
         |     |     |  +--rw prefix?        inet:ip-prefix
         |     |     |  +--rw set-tag?       oc-pt:tag-type
         |     |     |  +--rw description?   string
         |     |     +--ro state
         |     |     |  +--ro prefix?        inet:ip-prefix
         |     |     |  +--ro set-tag?       oc-pt:tag-type
         |     |     |  +--ro description?   string
         |     |     +--rw next-hops
         |     |     |  +--rw next-hop* [index]
         |     |     |     +--rw index            -> ../config/index
         |     |     |     +--rw config
         |     |     |     |  +--rw index?                                     string
         |     |     |     |  +--rw next-hop?                                  union
         |     |     |     |  +--rw recurse?                                   boolean
         |     |     |     |  +--rw metric?                                    uint32
         |     |     |     |  +--rw preference?                                uint32
         |     |     |     |  +--rw wecmp-weight?                              union
         |     |     |     |  +--rw oc-loc-rt-netinst:next-network-instance?   -> /oc-ni:network-instances/network-instance/config/name
         |     |     |     |  +--rw oc-loc-rt-netinst:nh-network-instance?     -> /oc-ni:network-instances/network-instance/config/name
         |     |     |     +--ro state
         |     |     |     |  +--ro index?                                     string
         |     |     |     |  +--ro next-hop?                                  union
         |     |     |     |  +--ro recurse?                                   boolean
         |     |     |     |  +--ro metric?                                    uint32
         |     |     |     |  +--ro preference?                                uint32
         |     |     |     |  +--ro wecmp-weight?                              union
         |     |     |     |  +--ro oc-loc-rt-netinst:next-network-instance?   -> /oc-ni:network-instances/network-instance/config/name
         |     |     |     |  +--ro oc-loc-rt-netinst:nh-network-instance?     -> /oc-ni:network-instances/network-instance/config/name
         |     |     |     +--rw enable-bfd
         |     |     |     |  +--rw config
         |     |     |     |  |  +--rw enabled?                       boolean
         |     |     |     |  |  +--rw desired-minimum-tx-interval?   uint32
         |     |     |     |  |  +--rw required-minimum-receive?      uint32
         |     |     |     |  |  +--rw detection-multiplier?          uint8
         |     |     |     |  +--ro state
         |     |     |     |     +--ro enabled?                       boolean
         |     |     |     |     +--ro desired-minimum-tx-interval?   uint32

bewing · 2026-04-02T21:29:00Z

FWIW, I swear I had opened a similar PR/ticket back in 2018....ish, but I can't find it now.

edit: found it

#197

gemini-code-assist

Code Review

This pull request introduces support for multicast forwarding tables (AFT) within the OpenConfig model, specifically adding submodules for IPv4, IPv6, and MPLS P2MP multicast forwarding. It defines new groupings for multicast outgoing interface states and structural lists, which are integrated into the main AFT module. Review feedback recommends utilizing existing common groupings in the new IPv4 and IPv6 submodules to ensure consistency and minimize code duplication.

bewing · 2026-05-05T14:55:08Z

Pushed a new changeset based on feedback received.

Using the existing NHG pattern has the side effect of removing RPF information from the model. This is important information to have (traffic received on the non-RPF interface isn't forwarded, usually punted to CPU/control plane). Where is the right place to put this information? Should it just be a leaf in the mc-entry/state grouping? Somewhere in the AFT-common tree?

bewing · 2026-05-05T14:58:23Z

Just noticed I need to incorporate some recent changes in the MPLS modeling into this change, working on that now.

bewing · 2026-05-05T15:41:42Z

Additional question - unicast MPLS AFT doesn't include aft-common-install-protocol in grouping aft-mpls-entry-state - is this an oversight in that AFT? oc-mpls:signaling-protocols seems like the likely reference here.

akalluru1

Some preliminary comments below, I'll review the changes one more time to thoroughly look at the description & few other things.

bewing · 2026-05-20T17:57:31Z

Using the existing NHG pattern has the side effect of removing RPF information from the model. This is important information to have (traffic received on the non-RPF interface isn't forwarded, usually punted to CPU/control plane). Where is the right place to put this information? Should it just be a leaf in the mc-entry/state grouping? Somewhere in the AFT-common tree?

For now, I have added an interface ref to the state container for IPv4 and IPv6

dplore · 2026-05-26T16:40:52Z

/gcbrun

OpenConfigBot · 2026-05-26T16:42:46Z

No major YANG version changes in commit 0da7f87

dplore · 2026-05-26T16:44:59Z

@rgwilton @earies @jsterne for review

dplore · 2026-05-26T16:46:29Z

Adding to June OC Community review for visibility

earies · 2026-05-26T17:09:00Z

@rgwilton @earies @jsterne for review

checking on this and will revert back

nsr-gh · 2026-06-20T02:36:49Z

Can you clarify which fields/leafs in a Next-Hop Group (NHG) and Next-Hop (NH) are relevant/applicable when a multicast route uses an NHG/NH?
As per the current model, an NHG uses multiple NHs in cases like ECMP, where traffic is distributed across the various legs of the NHG based on weight. In the case of multicast, however, all packets are sent to all legs. How will this behavior be represented using the existing NHG/NH model?

github-project-automation Bot added this to OC Operator Review Apr 2, 2026

bewing requested a review from a team as a code owner April 2, 2026 21:24

gemini-code-assist Bot reviewed Apr 2, 2026

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Comment thread release/models/aft/openconfig-aft-ipv4-multicast.yang Outdated

Comment thread release/models/aft/openconfig-aft-ipv6-multicast.yang Outdated

dplore assigned ElodinLaarz Apr 3, 2026

dplore moved this to Ready to discuss in OC Operator Review Apr 3, 2026

akalluru1 reviewed Apr 7, 2026

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Comment thread release/models/aft/openconfig-aft-ipv4-multicast.yang Outdated

bewing force-pushed the feat/mft branch 2 times, most recently from d5ccef2 to fd48ac6 Compare May 5, 2026 14:51

bewing requested a review from akalluru1 May 5, 2026 14:57

bewing force-pushed the feat/mft branch from fd48ac6 to b8b9100 Compare May 5, 2026 15:07

bewing force-pushed the feat/mft branch 2 times, most recently from 632029b to 50c70f7 Compare May 5, 2026 16:22

akalluru1 reviewed May 19, 2026

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Comment thread release/models/aft/openconfig-aft-ipv4-multicast.yang Outdated

Comment thread release/models/aft/openconfig-aft-ipv6-multicast.yang Outdated

Add multicast-focused AFTs

0da7f87

bewing force-pushed the feat/mft branch from 50c70f7 to 0da7f87 Compare May 20, 2026 17:54

OpenConfigBot added the non-breaking label May 26, 2026

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bewing commented Apr 2, 2026 •

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