[j-nsp] BGP default action constraints with advertise-inactive?

[Jason Lixfeld]

Hello!

I’m confused about some observations while testing BGP announcements of inactive routes.  I’m hoping someone can offer some clue.

I have this sample route:

jlixfeld at mx# run show route table rifoo.inet.0 protocol static 44.44.44.0/21 detail

rifoo.inet.0: 27 destinations, 29 routes (27 active, 0 holddown, 0 hidden)
44.44.44.0/21 (1 entry, 1 announced)
        *Static Preference: 5
                Next hop type: Discard, Next hop index: 0
                Address: 0x71101cc
                Next-hop reference count: 42
                State: <Active NotInstall Int Ext>
                Age: 12:24:23
                Validation State: unverified
                Task: RT
                Announcement bits (1): 2-BGP_RT_Background
                AS path: I
                Communities: 4444:1001

[edit]
jlixfeld at mx#

My understanding is:

1. With advertise-inactive configured, this route should be advertised to an EBGP neighbor that has no export policy configured.
[ https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/advertise-inactive-edit-protocols-bgp.html ]

2. The BGP default action of 'accept' should not require an accept action in a policy statement.
[ https://www.juniper.net/documentation/en_US/junos/topics/concept/policy-routing-policies-actions-defaults.html ]

However, neither of these two cases seem to be true, so my understanding is obviously wrong and I haven’t been able to find any documentation that points to the difference in behaviour.

Based on the configuration below, here’s what works and what doesn’t:

To 4.4.4.4: 44.44.44.0/21 is not announced.  
To 5.5.5.5: 44.44.44.0/21 is not announced unless tfoo includes 'then accept' and ANNOUNCE:ANCHOR then {} includes 'accept'
To 6.6.6.6: 44.44.44.0/21 is not announced unless sfoo ANNOUNCE:ANCHOR then {} includes 'accept'

routing-instances {
    rifoo {
        routing-options {
            rib rifoo.inet6.0 {
                static {
                    route 2607:4444::/32 {
                        discard;
                        no-install;
                        community 4444:1001;
                    }
                }
            }
            static {
                route 44.44.44.0/21 {
                    discard;
                    no-install;
                    community 4444:1001;
                }
        protocols {
            bgp {
                group gfoo {
                    type external;
                    advertise-inactive;
                    neighbor 4.4.4.4 {
                        peer-as 5555;
                    }
                    neighbor 5.5.5.5 {
                        export pfoo
                        peer-as 5555;
                    }
                    neighbor 6.6.6.6 {
                        export sfoo
                        peer-as 5555;
                    }
                }
            }
        }
    }
}
policy-statement pfoo {
    term tfoo {
        from policy sfoo
        # then accept;
    }
}
policy-statement sfoo {
    term ANNOUNCE:ANCHOR {
        from {
            protocol static;
            community TYPE:ANCHOR;
        }
        then {
            community delete TYPE:ANCHOR;
            # accept;
        }
    }
}
community TYPE:ANCHOR members 4444:1001;

Can anyone see what I might be missing here?

Thanks!