Add decap mpls-in-gre

[dplore]

Change Scope

• Add a leaf to configure a policy-forwarding action to decapsulate MPLS in GRE packets.

/network-instances/network-instance/policy-forwarding/policies/policy/rules/rule/action/config/decapsulate-mpls-in-gre

Platform Implementations

• Arista EOS - decap-group
• EOS native config creates a system wide configuration to decap packets with a specific destination IP address (decap-ip)

switch(config)#ip decap-group decap-gp-1
switch(config)#tunnel type gre
switch(config)#tunnel decap-ip 100.1.1.2
switch(config)#tunnel overlay mpls qos map mpls-traffic-class to traffic-class

• Cisco IOS XR - MPLS in GRE decap
  Cisco IOS XR native config requires a tunnel interface in addition to a Cisco PBR rule.

Router # configure
Router(config)# interface tunnel-ip1
Router(config-if)# ipv4 address 112.0.0.2 255.255.255.0
Router(config-if)# tunnel mode gre ipv4 decap
Router(config-if)# tunnel source Loopback 0
Router(config-if)# tunnel destination 10.0.0.1

! PBR Configuration for GRE Tunnel Decapsulation
Router(config)# class-map type traffic match-all test_gre1
Router(config-cmap)# match protocol gre
Router(config-cmap)# match destination-address ipv4 50.0.0.1 255.255.255.255
Router(config-cmap)# match source-address ipv4 10.0.0.1 255.255.255.255
Router(config-cmap)# end-class-map
Router(config)# policy-map type pbr P1-test
Router(config-pmap)# class type traffic test_gre1
Router(config-pmap-c)#decapsulate gre
Router(config-pmap-c)# end-policy-map
Router(config)# vrf-policy vrf default address-family ipv4 policy type pbr input P1-test

[OpenConfigBot]

No major YANG version changes in commit 417f313

[rgwilton]

Please can you clarify why this needs to be a specific mpls-in-gre-decaps, and not just a gre-decaps. E.g., looking at your Cisco config example there isn't any mention of MPLS config, although perhaps that is a slightly different config example.

[dplore]

Please can you clarify why this needs to be a specific mpls-in-gre-decaps, and not just a gre-decaps. E.g., looking at your Cisco config example there isn't any mention of MPLS config, although perhaps that is a slightly different config example.

I believe this is needed to provide a hint that the payload is expected to be MPLS and forwarded as such. However, it is a good question for implementation owners to answer. Do you need this hint for MPLS or is the existing decapsulate-gre sufficient?