Extend BGP Confederation schema with member-ASN ranges and loose-path-validation.

[rszarecki]

Change Scope

Extend BGP Confederation member-ASN ranges and loose-path-validation.

In large BGP Confederated network it is impractical to explicitly list in configuration all potentially 100's of member-AS. It is also not required for implementaion to be aware of all member-ASN. Implementation only need to know member-ASN it has configured confederation external BGP session.

• The member-as-range structure allows for efficient listing large number of member-ASN if they are allocated in structured way e.g. gotm 4B ASN private space.
• The 'loose-as-validation' boolean allows to explicitly control implementation behaviour regarding AS_PATH attribute validdeation. This is needed since different existing implementaions has disticnt implicit and non-configurable behaviours.

Platform Implementations

AS_PATH validation:

implementation	implicit behaviour
Arista EoS	loose. Path is valid if non-listed ASN is in BGP_CONFEDERATION_SEQUENCE object.
Cisco IOS	loose. Path is valid if non-listed ASN is in BGP_CONFEDERATION_SEQUENCE object.
Juniper	strict. Path is invalid if non-listed ASN is in BGP_CONFEDERATION_SEQUENCE object. Error handling may reset BGP session.
Nokia SR-OS	strict. Path is invalid if non-listed ASN is in BGP_CONFEDERATION_SEQUENCE object. Error handling may reset BGP session. (to be confirmed)
Quagga/FRR	loose. Path is valid if non-listed ASN is in BGP_CONFEDERATION_SEQUENCE object

member-as-range

This is a new feature.

Tree View

module: openconfig-network-instance
  +--rw network-instances
     +--rw network-instance* [name]
        +--rw protocols
           +--rw protocol* [identifier name]
              +--rw bgp
                 +--rw global
                    +--rw confederation
                       +--rw config
                       |  +--rw identifier?              oc-inet:as-number
                       |  +--rw member-as*               oc-inet:as-number
+                      |  +--rw loose-path-validation?   boolean
                       +--ro state
                       |  +--ro identifier?              oc-inet:as-number
                       |  +--ro member-as*               oc-inet:as-number
+                      |  +--ro loose-path-validation?   boolean
+                       +--rw member-as-ranges
+                          +--rw member-as-range* [first-asn last-asn]
+                             +--rw first-asn    -> ../config/first-asn
+                             +--rw last-asn     -> ../config/last-asn
+                             +--rw config
+                             |  +--rw first-asn?   oc-inet:as-number
+                             |  +--rw last-asn?    oc-inet:as-number
+                             +--ro state
+                                +--ro first-asn?   oc-inet:as-number
+                                +--ro last-asn?    oc-inet:as-number

[gemini-code-assist]

Code Review

This pull request updates the OpenConfig BGP models to version 9.10.0, introducing schema support for BGP Confederation member-ASN ranges and loose-path-validation. The changes include a new grouping for ASN ranges and a configuration leaf for path validation behavior. Feedback suggests adding a 'must' constraint to ensure ASN ranges are valid and provides corrections for typos in the documentation strings.

[OpenConfigBot]

No major YANG version changes in commit e1acc8a