Symptom
~50% of outgoing traffic from an pub/sub SDA Transit site is black holed due to traffic being sent to a border node which does not have a viable data plane path to remote rlocs.
The affected border node continues to register published remote prefixes over the wan to the local CP despite not having viable data plane connectivity.
Conditions
Both uplinks from a border node towards the wide area network are down, however local routing via IGP provides a default route.
Down state to RLOCs can be seen via the below output:
C2-Border-1#sh lisp instance-id 4100 ipv4 publication /24
LISP Publication Information
Requested EID-prefix:
EID-prefix: /24
First published: 03:08:37
Last published: 03:08:37
State: complete
Publisher :4342, last published 03:08:37, TTL never
publisher epoch 3, entry epoch 3
entry-state complete
xTR-ID 0x5178948C-0x30159A7C-0x2CC36CBF-0x84F698F0
site-ID unspecified
Domain-ID 104221363
Multihoming-ID 19123
Locator Pri/Wgt State Encap-IID
10/10 down - <<<<
10/10 down - <<<<
